CN105847970A - Video display quality calculating method and equipment - Google Patents

Abstract

The invention discloses a video display quality calculating method and an equipment, belongs to the multimedia technology field and can solve a problem that a video quality calculating method in the prior art can not accurately present the video display quality. The method comprises steps that screen display quality of a video, a frame rate of the video and a code rate of the video are acquired, the video display quality is calculated through a first preset algorithm according to the screen display quality, the frame rate and the code rate, and the video display quality is used for indicating the highest display quality value of the video on a display screen. The method is used for calculating the video display quality.

Description

Method and device for calculating video display quality

technical field

The invention relates to the field of multimedia technologies, in particular to a method and device for calculating video display quality.

Background technique

With the rapid development of multimedia technology, video data has become the main data of network transmission, and video display quality has also become a key indicator to measure network service quality. Therefore, how to conveniently and effectively determine the video display quality has become an urgent problem to be solved.

In the prior art, in one implementation mode, the video quality is obtained by calculating according to the video frame type, video frame size, frame rate and code rate; in another implementation mode, the peak signal-to-noise ratio (PSNR) of the video data is calculated. : Peak Signal to Noise Ratio, referred to as: PSNR), to determine the video quality.

In the process of realizing the above calculation of video quality, the inventor found that in the prior art, the calculation is only based on the parameters of the video data itself, which can only determine the quality of video compression coding, or the quality of the video transmission process, and cannot accurately reflect the video display. quality.

Contents of the invention

In order to solve the problem that the video quality calculation method in the prior art cannot accurately reflect the video display quality, the embodiments of the present invention provide a video display quality calculation method and device. Described technical scheme is as follows:

In a first aspect, the present invention provides a method for calculating video display quality, the method comprising:

Obtain the screen display quality of the video, and the screen display quality is used to indicate the highest value of the display quality of the video on the display screen;

Obtain the frame rate of the video and the bit rate of the video;

The video display quality is calculated according to the screen display quality, the video frame rate, and the video bit rate according to a first preset algorithm, and the video display quality is used to indicate the display quality of the video on the display screen.

In a possible implementation, the video display quality is positively correlated with the screen display quality, the video display quality is positively correlated with the video frame rate, and the video display quality is positively correlated with the video bit rate.

In a possible implementation, obtaining the screen display quality of the video includes:

Calculate the screen display quality according to the size of the display screen and the display resolution according to the second preset algorithm, the size of the display screen is used to indicate the size of the display screen, and the display resolution includes at least one of the resolution of the video and the resolution of the display screen item, the size of the display screen is negatively correlated with the screen display quality, and the display resolution is positively correlated with the screen display quality.

Exemplarily, the display screen may be rectangular, and the size of the display screen may be a diagonal length of the display screen.

In a possible implementation, the screen display quality is calculated according to a second preset algorithm according to the size and display resolution of the display screen, including:

Obtain the effective display pixel density, and calculate the screen display quality according to the first formula, the first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, f are constants.

Exemplarily, the effective display pixel density P is used to indicate the number of pixels actually displayed in the video per unit area of the display screen.

In a possible implementation, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and obtaining the effective display pixel density includes: calculating the effective display pixel density according to the second formula, the second formula for:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, _Sh is the height of the display resolution.

In a possible implementation, when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen; when the resolution of the video is smaller than the resolution of the display screen, the display resolution is the resolution of the video resolution.

In a possible implementation, the display resolution includes the resolution of the video and the resolution of the display screen, and obtaining an effective display pixel density also includes:

The effective display pixel density is calculated according to the third formula, which is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant.

In a possible implementation, the video display quality is calculated according to the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video, including:

Calculate the video display quality Q _v according to the fourth formula, the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, b is a constant.

In a possible implementation, the video display quality is calculated according to the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video, including:

Calculate the video display quality Q _v according to the fifth formula, the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, Y ₁ is the first quality factor, Y ₂ is the second quality factor.

In one possible implementation,

When λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0);

When λ<1,

Wherein, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

In a possible implementation, when the frame rate of the video is greater than the reference frame rate, the video display quality is calculated according to the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video, including:

Calculate the video display quality Q _v according to the sixth formula, the sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

Y ₁ =1, Y ₂ =1, or,

Y ₁ ＝fun1(V _c ), Y ₁ ＝fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both vary with _Vc increases and increases.

Exemplarily, the content complexity of the video includes time complexity and content complexity.

In one possible implementation, the method also includes:

Get the content complexity of the video.

In a second aspect, the present invention provides an electronic device, comprising:

The first acquisition unit is used to acquire the screen display quality of the video, and the screen display quality is used to indicate the highest value of the display quality of the video on the display screen;

The second acquisition unit is used to acquire the frame rate of the video and the code rate of the video; the calculation unit is used to obtain the screen display quality according to the first acquisition unit, the frame rate of the video acquired by the second acquisition unit and the code rate of the video according to The first preset algorithm calculates the video display quality, which is used to indicate the display quality of the video on the display screen.

In a possible implementation, the first acquisition unit is specifically configured to calculate the screen display quality according to the second preset algorithm according to the size and display resolution of the display screen, the size of the display screen is used to indicate the size of the display screen, and the display resolution The rate includes at least one of video resolution and display screen resolution, the size of the display screen is negatively correlated with screen display quality, and the display resolution is positively correlated with screen display quality.

Exemplarily, the electronic device includes the display screen, or, the display screen does not belong to the electronic device.

In a possible implementation, the first acquiring unit is specifically configured to acquire the effective display pixel density, and calculate the screen display quality according to a first formula, and the first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, f are constants.

In a possible implementation, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and the first acquisition unit is specifically used to calculate the effective display pixel density according to the second formula, the second formula for:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, _Sh is the height of the display resolution.

In a possible implementation, when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen; when the resolution of the video is smaller than the resolution of the display screen, the display resolution is the resolution of the video resolution.

In a possible implementation, the display resolution includes the resolution of the video and the resolution of the display screen,

The first acquisition unit is specifically used to calculate the effective display pixel density according to the third formula, and the third formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant.

In one possible implementation,

The calculation unit is specifically used to calculate the video display quality Q _v according to the fourth formula, the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, b is a constant.

In one possible implementation,

The calculation unit is specifically used to calculate the video display quality Q _v according to the fifth formula, and the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, Y ₁ is the first quality factor, Y ₂ is the second quality factor.

In one possible implementation,

When λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0);

When λ<1,

Wherein, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

In one possible implementation,

The calculation unit is specifically used to calculate the video display quality Q _v according to the sixth formula when the frame rate of the video is greater than the reference frame rate. The sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

Y ₁ =1, Y ₂ =1, or,

Y ₁ ＝fun1(V _c ), Y ₁ ＝fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both vary with _Vc increases and increases.

In one possible implementation,

The acquiring unit is also used to acquire the content complexity of the video.

In a third aspect, the present invention provides an electronic device, including: the electronic device includes: a processor, a memory, and a bus, the processor and the memory are connected to each other through the bus, the memory is used to store programs and data, and the processor is used to call the programs stored in the memory Implement a method for calculating video display quality;

The processor is used to obtain the screen display quality of the video, and the screen display quality is used to indicate the highest value of the display quality of the video on the display screen; obtain the frame rate of the video and the bit rate of the video; according to the screen display quality, the frame of the video The video display quality is calculated according to the first preset algorithm, and the video display quality is used to indicate the display quality of the video on the display screen.

In a possible implementation, the processor is specifically configured to calculate the screen display quality according to a second preset algorithm according to the size and display resolution of the display screen, where the size of the display screen is used to indicate the size of the display screen, and the display resolution includes At least one of the resolution of the video and the resolution of the display screen, the size of the display screen is negatively correlated with the quality of the screen display, and the display resolution is positively correlated with the quality of the screen display.

In a possible implementation, the processor is specifically configured to obtain an effective display pixel density, and calculate the screen display quality according to a first formula, where the first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&CenterDot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, f are constants.

In a possible implementation, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and the processor is specifically used to calculate the effective display pixel density according to the second formula, and the second formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, _Sh is the height of the display resolution.

In a possible implementation, when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen; when the resolution of the video is smaller than the resolution of the display screen, the display resolution is the resolution of the video resolution.

In a possible implementation, the display resolution includes the resolution of the video and the resolution of the display screen, and the processor is specifically used to calculate the effective display pixel density according to the third formula. The third formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant.

In one possible implementation,

The processor is specifically configured to calculate the video display quality Q _v according to the fourth formula, the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, b is a constant.

In one possible implementation,

The processor is specifically used to calculate the video display quality Q _v according to the fifth formula, the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, Y ₁ is the first quality factor, Y ₂ is the second quality factor.

In one possible implementation,

When λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0);

When λ<1,

Wherein, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

In one possible implementation,

The processor is specifically used to calculate the video display quality Q _v according to the sixth formula when the frame rate of the video is greater than the reference frame rate, and the sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In one possible implementation,

Y ₁ =1, Y ₂ =1, or,

Y ₁ ＝fun1(V _c ), Y ₁ ＝fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both vary with _Vc increases and increases.

In one possible implementation,

The processor is also used to obtain the content complexity of the video.

The method and device for calculating the video display quality provided by the present invention obtain the screen display quality of the video, the frame rate of the video, and the bit rate of the video, and follow the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video Calculate the display quality of the video, where the screen display quality is used to indicate the highest value of the display quality of the video on the display screen. The video display quality is calculated based on the screen display quality, video frame rate, and video bit rate, not only based on the parameters of the video data itself, but also taking into account the display of the video on the display screen, which can more accurately reflect the video display quality.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a network system provided by an embodiment of the present invention;

2 is a schematic flowchart of a method for calculating video display quality provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an electronic device provided by another embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

An embodiment of the present invention provides a method for calculating video display quality, which is used for calculating video display quality, and can accurately reflect the display quality of video on a display screen.

Preferably, when a user watches a video on the network, the method for calculating the video display quality provided by this embodiment can accurately calculate the display quality of the video watched by the user, as shown in FIG. 1 , which shows a network system In the network system 10, the server 101 transmits the video to the terminal device 103 through the access network 102, and the user watches the video on the terminal device 103, which can be a tablet computer, a mobile phone, a TV, a computer, etc. , the present invention is not limited thereto. In the process of video transmission through the access network 102, the display quality of the video may be affected due to reasons such as packet loss and transmission speed; Due to reasons such as resolution, the displayed video quality is also different. Therefore, the video display quality calculation method provided in this embodiment can be used to accurately reflect the video display quality. The method for calculating the video display quality provided in this embodiment may be executed by the terminal device 103 or by other electronic devices, which is not limited in the present invention. In the present invention, video is a collection of images that can be continuously played on the display screen. As long as the objects that can be calculated by the calculation method of video display quality provided by the present invention belong to the video referred to in the present invention, they should not The scope of protection claimed by the present invention is limited based on people's usual understanding of video in daily life.

Specifically, referring to FIG. 2, the method for calculating the video display quality provided in this embodiment includes the following steps:

201. Acquire the screen display quality of the video.

Wherein, the screen display quality is used to indicate the highest value of the display quality of the video on the display screen, and the screen display quality is calculated according to the size of the display screen and the display resolution.

Exemplarily, the display screen may be rectangular, and the size of the display screen may be a diagonal length of the display screen.

Optionally, the screen display quality is calculated according to the second preset algorithm according to the size and display resolution of the display screen, the size of the display screen is used to indicate the size of the display screen, and the display resolution includes the resolution of the video and the resolution of the display screen At least one of them, the size of the display screen is negatively correlated with the quality of the screen display, and the display resolution is positively correlated with the quality of the screen display, that is, the larger the size of the display screen, the lower the quality of the screen display; the higher the display resolution, The higher the quality of the screen display.

Preferably, the video display quality is positively correlated with the screen display quality, the video display quality is positively correlated with the video frame rate, and the video display quality is positively correlated with the video bit rate.

Preferably, in this embodiment, the maximum value of the display quality is Q _max , and the minimum value of the display quality is Q _min . For example, the maximum value of the display quality can be set to 5, and the minimum value can be set to 1. These two boundaries The value is applicable to all display devices, and different display devices can calculate their different screen display quality. In this way, different display devices have a common display quality standard, which can more accurately reflect the display quality of the video. Two different You can compare the display quality of your videos even if you watch them on different display devices. Here, optionally, this embodiment provides a specific method for calculating the screen display quality. Of course, there are more than one method for calculating the screen display quality. Here, a preferred implementation method is only listed for illustration, and it does not represent The present invention is limited thereto. Optionally, the effective display pixel density is obtained, and the screen display quality is calculated according to the first formula. The first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&CenterDot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, and f are constants, and d, e, and f can be constants obtained from model training. The effective display pixel density P is used to indicate the number of pixels actually displayed in the unit area of the display screen.

In an application scenario, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and the effective display pixel density is calculated according to the second formula, and the second formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, _Sh is the height of the display resolution. Optionally, if the display resolution only includes the resolution of the video, then S _w is the width of the video resolution, and _Sh is the height of the video resolution; if the display resolution only includes the resolution of the display screen, then S _w is the width of the resolution of the display screen, _Sh is the height of the resolution of the display screen; if the display resolution includes the resolution of the video and the resolution of the display screen, when the resolution of the video is greater than the resolution of the display screen, The display resolution is the resolution of the display screen. When the resolution of the video is smaller than the resolution of the display screen, the display resolution is the resolution of the video.

In another application scenario, the display resolution includes the resolution of the video and the resolution of the display screen, and the effective display pixel density is calculated according to the third formula, which is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant, which can be a very A small positive number, preferably, g can be 0.05.

202. Acquire the frame rate of the video and the bit rate of the video.

Exemplarily, the code rate of the video is used to indicate the number of bits transmitted per unit time of the video, and the frame rate of the video is used to indicate the number of frames displayed per second of the video.

203. Calculate the video display quality according to a first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video.

Wherein, the video display quality is used to indicate the display quality of the video on the display screen.

Optionally, this embodiment provides three specific ways to calculate the video display quality. Of course, other algorithms can also be used to calculate the video display quality. This is just an example to illustrate the way the present invention can be implemented. The specific algorithm is as follows:

The first way:

Calculate the video display quality Q _v according to the fourth formula, the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a, c are constants, the size of a, c is related to the encoding type and resolution of the video, U is an adjustment function, which increases with the increase of λ, and Y ₁ is the first quality factor, _Y2 is the second quality factor.

Further, U can be a function of λ, which increases as λ increases. In a possible implementation,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Wherein, b is a constant, which can be a very small positive number, preferably, b can be 0.05.

The second way:

Calculate the video display quality Q _v according to the fifth formula, the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, the size of a, c is related to the encoding type and resolution of the video, Y ₁ is the first quality factor, _Y2 is the second quality factor.

Optionally, when λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0); when λ<1, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

The third method: when the frame rate of the video is greater than the reference frame rate;

Calculate the video display quality Q _v according to the sixth formula, the sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

In the above three methods of calculating video display quality, the reference frame rate F _B is the frame rate at which the video can be played smoothly, and the unit is frame per second (English: Frame Per Second, FPS for short). Generally, 24FPS-30FPS can be regarded as For smooth playback, the reference frame rate can be set according to specific conditions, which is not limited by the present invention.

In addition, optionally, the first quality factor Y ₁ and the second quality factor Y ₂ are used to adjust the video display quality, Y ₁ =1, Y ₂ =1, or,

Y ₁ ＝fun1(V _c ), Y ₁ ＝fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both vary with The increase of V _c increases, and makes Q _sc decrease accordingly, that is, the greater the complexity of the video content, the lower the video display quality. When the content complexity of the video is unknown, the first quality factor _Y1 and the second quality factor _Y2 can be set to 1. When the content complexity of the video is known, the video quality can be added when calculating the video display quality Influence of the content complexity, it should be noted that the method for calculating the video display quality provided in this embodiment may further include a step of obtaining the content complexity of the video. In the case of considering the content complexity of the video, the calculated result can reflect the display quality of the video more accurately.

Wherein, the content complexity of the video may include at least one of the time complexity of the video and the space complexity of the video, and the time complexity is used to indicate the change degree of the included image between one frame and one frame of the video, and two frames The greater the image difference between the videos, the higher the time complexity. It can also be said that the time complexity is used to indicate the degree of change of the video sequence over time, and the time complexity of the sequence with faster video content movement is higher; the space complexity The degree is used to indicate the texture complexity of the image in a frame, and the more complex the scene displayed by the image of the video, the higher its spatial complexity. The time complexity of a video can be determined according to the size of one video frame and the bit rate. Specifically, it can be determined according to the formula:

calculate;

TCC is the time complexity of the video, B _v is the bit rate of the video, ABI is the average size of one frame, and t ₀ is a constant.

The space complexity of the video can be calculated according to the number of bits of a pixel in a frame of the video and the parameter x.

Of course, this is just an example. The content complexity of the video can also be calculated in other ways. The content complexity of the video is used to indicate the difficulty of playing the video. The greater the complexity of the video content, the lower the video display quality. The smaller the content complexity of the video, the higher the video display quality.

The method for calculating the video display quality provided by this embodiment obtains the screen display quality of the video, the frame rate of the video, and the bit rate of the video, and calculates according to the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video The video display quality, wherein, the screen display quality is used to indicate the highest value of the display quality of the video on the display screen. The video display quality is calculated based on the screen display quality, video frame rate, and video bit rate, not only based on the parameters of the video data itself, but also taking into account the display of the video on the display screen, which can more accurately reflect the video display quality.

Based on the method for calculating video display quality described in the embodiment corresponding to FIG. 2 above, an embodiment of the present invention provides an electronic device for performing the method for calculating video display quality described in the embodiment corresponding to FIG. 2 above, Referring to FIG. 3 , the electronic device 30 includes: a first acquisition unit 301 , a second acquisition unit 302 and a calculation unit 303 .

Wherein, the first obtaining unit 301 is used to obtain the screen display quality of the video, and the screen display quality is used to indicate the highest value of the display quality of the video on the display screen;

The second acquisition unit 302 is used to acquire the frame rate of the video and the code rate of the video; the calculation unit 303 is used to obtain the screen display quality according to the first acquisition unit 301, the frame rate of the video acquired by the second acquisition unit 302 and the video The bit rate of the video is calculated according to the first preset algorithm, and the video display quality is used to indicate the display quality of the video on the display screen.

Optionally, the first acquisition unit 301 is specifically configured to calculate the screen display quality according to the second preset algorithm according to the size and display resolution of the display screen, the size of the display screen is used to indicate the size of the display screen, and the display resolution includes video At least one of the resolution and the resolution of the display screen, the size of the display screen is negatively correlated with the quality of the screen display, and the display resolution is positively correlated with the quality of the screen display, that is, the larger the size of the display screen, the better the quality of the screen display The smaller it is; the higher the display resolution, the greater the quality of the screen display.

Exemplarily, the electronic device includes the display screen, or, the display screen does not belong to the electronic device.

Preferably, the first acquiring unit 301 is specifically configured to acquire the effective display pixel density, and calculate the screen display quality according to the first formula, the first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, f are constants.

In an application scenario, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and the first acquisition unit 301 is specifically used to calculate the effective display pixel density according to the second formula, the second formula for:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, _Sh is the height of the display resolution. Optionally, if the display resolution includes the resolution of the video and the resolution of the display screen, when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen; When specifying the resolution of the screen, the display resolution is the resolution of the video.

In another application scenario, the display resolution includes the resolution of the video and the resolution of the display screen. The first acquisition unit 301 is specifically used to calculate the effective display pixel density according to the third formula. The third formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant.

Optionally, the calculation unit 303 is specifically configured to calculate the video display quality _Qv according to a fourth formula, the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

optional,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, b is a constant.

Optionally, the calculation unit 303 is specifically configured to calculate the video display quality Q _v according to a fifth formula, the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, Y ₁ is the first quality factor, Y ₂ is the second quality factor.

Further optionally, when λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0); when λ<1, Wherein, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

Optionally, the calculation unit 303 is specifically configured to calculate the video display quality _Qv according to the sixth formula when the frame rate of the video is greater than the reference frame rate, and the sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

Optionally, Y ₁ =1, Y ₂ =1, or, Y ₁ =fun1(V _c ), Y ₁ =fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both increase with the increase of V _c .

In addition, optionally, the acquiring unit 301 is specifically configured to acquire the content complexity of the video.

Of course, in this embodiment, the structure of the electronic device is only described with a virtual module, and its specific implementation may be to store the program and data that realize the calculation method of the video display quality of the present invention in the memory, and the processor calls the memory in the memory. The program implements the method for calculating the video display quality of the present invention, and the electronic devices can be divided into virtual modules in this embodiment according to the different functions in each step, which does not mean that each electronic device includes the physical structure of each virtual module.

Based on the calculation method of video display quality described in the embodiment corresponding to FIG. 2 above, another embodiment of the present invention provides an electronic device for performing the calculation of video display quality described in the embodiment corresponding to FIG. 2 above. Method, with reference to shown in Figure 4, this electronic equipment 40 comprises: comprise: processor 401, memory 402 and bus 403, processor 401 and memory 402 are interconnected by bus, memory 402 is used for storing program and data, and processor 401 uses The method for calculating the video display quality is executed by calling the program stored in the memory;

The processor 401 is used to obtain the screen display quality of the video, and the screen display quality is used to indicate the highest value of the display quality of the video on the display screen; obtain the frame rate of the video and the code rate of the video; The frame rate and the bit rate of the video are used to calculate the video display quality according to the first preset algorithm, and the video display quality is used to indicate the display quality of the video on the display screen.

Optionally, the processor 401 is specifically configured to calculate the screen display quality according to the second preset algorithm according to the size and display resolution of the display screen, the size of the display screen is used to indicate the size of the display screen, and the display resolution includes video resolution The size of the display screen is negatively correlated with the screen display quality, and the display resolution is positively correlated with the screen display quality.

Optionally, the processor 401 is specifically configured to obtain an effective display pixel density, and calculate the screen display quality according to a first formula, and the first formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&lsqb;</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}^{\mathrm{<span\; class="notranslate">\; e</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; f</span>}}}<span\; class="notranslate">\; \&rsqb;</span><span\; class="notranslate">\; ;</span>$

Among them, Q _sc is the screen display quality, Q _max is a constant, used to indicate the maximum value of the display quality, P is the effective display pixel density, the effective display pixel density is calculated according to the display resolution and the size of the display screen, D _s For the size of the display screen, d, e, f are constants.

Optionally, in an application scenario, the display resolution is the resolution of the video, or the display resolution is the resolution of the display screen, and the processor 401 is specifically used to calculate the effective display pixel density according to the second formula, the first The second formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, S _w is the width of the display resolution, and _Sh is the height of the display resolution. Preferably, when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen, and when the resolution of the video is smaller than the resolution of the display screen, the display resolution is the resolution of the video.

Optionally, in another application scenario, the display resolution includes video resolution and display screen resolution,

The processor 401 is specifically configured to calculate the effective display pixel density according to a third formula, and the third formula is:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; =</span>\frac{\sqrt{{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; h</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&lsqb;</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&theta;</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; \&rsqb;</span>}<span\; class="notranslate">\; ;</span>$

Among them, θ is the resolution matching factor, when the resolution of the video is less than or equal to the resolution of the display screen, θ=1, when the resolution of the video is greater than the resolution of the display screen,

V _w is the width of the resolution of the video, V _h is the height of the resolution of the video, D _w is the width of the resolution of the display screen, D _h is the height of the resolution of the display screen, and g is a constant.

Optionally, the processor 401 is specifically configured to calculate the video display quality _Qv according to a fourth formula, and the fourth formula is:

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

Among them, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, and Q _min is a constant , used to indicate the minimum value of the display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

further,

$\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}}<span\; class="notranslate">\; ;</span>$

Among them, b is a constant.

Optionally, the processor 401 is specifically configured to calculate the video display quality Q _v according to a fifth formula, and the fifth formula is:

Q _v = Q _B func(λ);

Among them, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

func(λ) is the correction factor, which decreases with the increase of λ, λ is the frame rate factor, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, and B _v is the video frame rate Code rate, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of the display quality, a, c are constants, Y ₁ is the first quality factor, Y ₂ is the second quality factor.

Further, when λ>1, func(λ)=a ₁ -a ₂ ·log(a ₃ ·λ), (a ₁ , a ₂ , a ₃ >0);

When λ<1,

Wherein, a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , and b ₃ are constants.

Optionally, the processor 401 is specifically configured to calculate the video display quality Q _v according to the sixth formula when the frame rate of the video is greater than the reference frame rate. The sixth formula is:

Q _v = func(Q _B ,λ);

in, c ₁ , c ₂ , c ₃ , c ₄ are constants, Q _B is the reference mass,

${\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}{\mathrm{<span\; class="notranslate">\; a</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ;</span>$

λ is the frame rate factor, and λ<1, λ=F _B /F _v , F _B is the reference frame rate, F _v is the frame rate of the video, B _v is the code rate of the video, Q _sc is the screen display quality, Q _min is a constant, used to indicate the minimum value of display quality, a and c are constants, U is an adjustment function, which increases with the increase of λ, Y ₁ is the first quality factor, and Y ₂ is the second quality factor.

Further, Y ₁ =1, Y ₂ =1, or,

Y ₁ ＝fun1(V _c ), Y ₁ ＝fun2(V _c ), V _c is used to indicate the content complexity of the video, fun1(V _c ) and fun2(V _c ) are functions on V _c , and both vary with _Vc increases and increases.

In one possible implementation,

The processor 401 is further configured to acquire the content complexity of the video.

The electronic device provided in this embodiment acquires the screen display quality of the video, the frame rate of the video, and the bit rate of the video, and calculates the video display quality according to the first preset algorithm according to the screen display quality, the frame rate of the video, and the bit rate of the video, Wherein, the screen display quality is used to indicate the highest value of the display quality of the video on the display screen. The video display quality is calculated based on the screen display quality, video frame rate, and video bit rate, not only based on the parameters of the video data itself, but also taking into account the display of the video on the display screen, which can more accurately reflect the video display quality.

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described devices and units can refer to the corresponding process in the foregoing method embodiments, and details are not repeated here. The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (19)

1. A method for calculating video display quality, the method comprising:

acquiring the screen display quality of a video, wherein the screen display quality is used for indicating the highest value of the display quality of the video on a display screen;

acquiring the frame rate of the video and the code rate of the video;

and calculating the video display quality according to the screen display quality, the frame rate of the video and the code rate of the video according to a first preset algorithm, wherein the video display quality is used for indicating the display quality of the video on the display screen.

2. The method of claim 1, wherein obtaining the screen display quality of the video comprises:

calculating the screen display quality according to the size and the display resolution of the display screen and a second preset algorithm, wherein the size of the display screen is used for indicating the size of the display screen, the display resolution comprises at least one of the resolution of the video and the resolution of the display screen, the size of the display screen and the screen display quality are in a negative correlation relationship, and the display resolution and the screen display quality are in a positive correlation relationship.

3. The method according to claim 2, wherein the calculating the screen display quality according to the size and the display resolution of the display screen according to a second preset algorithm comprises:

obtaining the effective display pixel density, and calculating the screen display quality according to a first formula, wherein the first formula is as follows:

$Q_{sc}=Q_{max}\&CenterDot;\&lsqb;1-\frac{1}{1+{\left(\frac{P}{d\&CenterDot;{D_s}^e}\right)}^f}\&rsqb;;$

wherein Q is_scFor the screen display quality, Q_maxIs a constant for indicating a maximum value of display quality, P is the effective display pixel density according to the display resolution and the size of the display screenCalculated to obtain, D_sD, e, f are constants for the size of the display screen.

4. The method of claim 3, wherein the display resolution is a resolution of the video or the display resolution is a resolution of the display screen, and wherein the obtaining the effective display pixel density comprises: calculating the effective display pixel density according to a second formula, the second formula being:

$P=\frac{\sqrt{{S_w}^2+{S_h}^2}}{D_s};$

wherein S is_wWidth of said display resolution, S_hIs the height of the display resolution.

5. The method of claim 4,

when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen, and when the resolution of the video is less than the resolution of the display screen, the display resolution is the resolution of the video.

6. The method of claim 3, wherein the display resolution comprises a resolution of the video and a resolution of the display screen, and wherein obtaining the effective display pixel density further comprises:

calculating the effective display pixel density according to a third formula, the third formula being:

$P=\frac{\sqrt{{V_w}^2+{V_h}^2}}{D_s\&CenterDot;\&lsqb;{(1+g)}^{\mathrm{\&theta;}}-g\&rsqb;};$

wherein θ is a resolution matching factor, θ is 1 when the resolution of the video is less than or equal to the resolution of the display screen, and θ is greater than the resolution of the display screen,

$\mathrm{\&theta;}=\frac{V_w\&CenterDot;V_h}{D_w\&CenterDot;D_h};$

V_wis the width of the resolution of the video, V_hHeight of resolution of said video, D_wWidth of resolution of said display screen, D_hG is a constant, which is the height of the resolution of the display screen.

7. The method according to any one of claims 1-6, wherein the calculating the video display quality according to the screen display quality, the frame rate of the video, and the bit rate of the video according to a first preset algorithm comprises:

calculating the video display quality Q according to a fourth formula_vThe fourth formula is:

$Q_v=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;U\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

where λ is a frame rate factor, λ ═ F_B/F_v，F_BAs a reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant value for indicating the minimum value of the display quality, a, c are constants, U is an adjusting function and increases with the increase of lambda, Y₁Is the first quality factor, Y₂Is the second quality factor.

8. The method according to any one of claims 1-6, wherein the calculating the video display quality according to the screen display quality, the frame rate of the video, and the bit rate of the video according to a first preset algorithm comprises:

calculating the video display quality Q according to a fifth formula_vThe fifth formula is:

Q_v＝Q_B·func(λ)；

wherein Q is_BFor the purpose of reference to the mass,

$Q_B=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

func (λ) is a correction factor that decreases as λ increases, λ is a frame rate factor, and λ ═ F_B/F_v，F_BAs a reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant for indicating the minimum value of the display quality, a, c are constants, Y₁Is the first quality factor, Y₂Is the second quality factor.

9. The method according to any one of claims 1 to 6, wherein when the frame rate of the video is greater than a reference frame rate, the calculating the video display quality according to the screen display quality, the frame rate of the video, and the bitrate of the video according to a first preset algorithm comprises:

calculating the video display quality Q according to a sixth formula_vThe sixth formula is:

Q_v＝func(Q_B,λ)；

wherein,c₁,c₂,c₃,c₄is constant, Q_BFor the purpose of reference to the mass,

$Q_B=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

λ is frame rate factor, and λ < 1 ═ F_B/F_v，F_BFor the reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant for indicating the minimum value of the display quality, a, c are constants, Y₁Is the first quality factor, Y₂Is the second quality factor.

10. An electronic device, comprising:

the device comprises a first acquisition unit, a second acquisition unit and a display unit, wherein the first acquisition unit is used for acquiring the screen display quality of a video, and the screen display quality is used for indicating the highest value of the display quality of the video on a display screen;

the second obtaining unit is used for obtaining the frame rate of the video and the code rate of the video; and the calculating unit is used for calculating the video display quality according to the screen display quality acquired by the first acquiring unit, the frame rate of the video acquired by the second acquiring unit and the code rate of the video according to a first preset algorithm, wherein the video display quality is used for indicating the display quality of the video on the display screen.

11. The apparatus of claim 10,

the first obtaining unit is specifically used for calculating the screen display quality according to the size and the display resolution of the display screen and a second preset algorithm, the size of the display screen is used for indicating the size of the display screen, the display resolution comprises at least one of the resolution of the video and the resolution of the display screen, the size of the display screen and the screen display quality are in a negative correlation relationship, and the display resolution and the screen display quality are in a positive correlation relationship.

12. The apparatus of claim 11,

the first obtaining unit is specifically configured to obtain an effective display pixel density, and calculate the screen display quality according to a first formula, where the first formula is:

$Q_{sc}=Q_{max}\&CenterDot;\&lsqb;1-\frac{1}{1+{\left(\frac{P}{d\&CenterDot;{D_s}^e}\right)}^f}\&rsqb;;$

wherein Q is_scFor the screen display quality, Q_maxIs a constant indicating a maximum value of display quality, P is an effective display pixel density calculated from the display resolution and the size of the display screen, D_sD, e, f are constants for the size of the display screen.

13. The apparatus of claim 12, wherein the display resolution is a resolution of the video or the display resolution is a resolution of the display screen,

the first obtaining unit is specifically configured to calculate the effective display pixel density according to a second formula, where the second formula is:

$P=\frac{\sqrt{{S_w}^2+{S_h}^2}}{D_s};$

wherein S is_wWidth of said display resolution, S_hIs the height of the display resolution.

14. The method of claim 13,

when the resolution of the video is greater than the resolution of the display screen, the display resolution is the resolution of the display screen, and when the resolution of the video is less than the resolution of the display screen, the display resolution is the resolution of the video.

15. The apparatus of claim 12, wherein the display resolution comprises a resolution of the video and a resolution of the display screen;

the first obtaining unit is specifically configured to calculate the effective display pixel density according to a third formula, where the third formula is:

$P=\frac{\sqrt{{V_w}^2+{V_h}^2}}{D_s\&CenterDot;\&lsqb;{(1+g)}^{\mathrm{\&theta;}}-g\&rsqb;};$

wherein θ is a resolution matching factor, θ is 1 when the resolution of the video is less than or equal to the resolution of the display screen, and θ is greater than the resolution of the display screen,

$\mathrm{\&theta;}=\frac{V_w\&CenterDot;V_h}{D_w\&CenterDot;D_h};$

V_wis the width of the resolution of the video, V_hHeight of resolution of said video, D_wWidth of resolution of said display screen, D_hG is a constant, which is the height of the resolution of the display screen.

16. The apparatus according to any one of claims 10 to 15,

the calculating unit is specifically configured to calculate the video display quality Q according to a fourth formula_vThe fourth formula is:

$Q_v=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;U\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

where λ is a frame rate factor, λ ═ F_B/F_v，F_BAs a reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant value for indicating the minimum value of the display quality, a, c are constants, U is an adjusting function and increases with the increase of lambda, Y₁Is the first quality factor, Y₂Is the second quality factor.

17. The apparatus according to any one of claims 10 to 15,

the calculating unit is specifically configured to calculate the video display quality Q according to a fifth formula_vThe fifth formula is:

Q_v＝Q_B·func(λ)；

wherein Q is_BFor the purpose of reference to the mass,

$Q_B=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

func (λ) is a correction factor that decreases as λ increases, λ is a frame rate factor, and λ ═ F_B/F_v，F_BAs a reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant for indicating the minimum value of the display quality, a, c are constants, Y₁Is the first quality factor, Y₂Is the second quality factor.

18. The apparatus according to any one of claims 10 to 15,

the calculating unit is specifically configured to calculate the video display quality Q according to a sixth formula when the frame rate of the video is greater than the reference frame rate_vThe sixth formula is:

Q_v＝func(Q_B,λ)；

wherein,c₁,c₂,c₃,c₄is constant, Q_BFor the purpose of reference to the mass,

$Q_B=Q_{sc}-\frac{Q_{sc}-Q_{min}}{1+{\left(\frac{B_v\&CenterDot;\mathrm{\&lambda;}}{a\&CenterDot;Y_1}\right)}^{c\&CenterDot;Y_2}};$

λ is frame rate factor, and λ < 1 ═ F_B/F_v，F_BFor the reference frame rate, F_vFor the frame rate of the video, B_vIs the code rate, Q, of the video_scFor the screen display quality, Q_minIs a constant for indicating the minimum value of the display quality, a, c are constants, Y₁Is the first quality factor, Y₂Is the second quality factor.

19. An electronic device, characterized in that the electronic device comprises: a processor, a memory and a bus, the processor and the memory being interconnected by the bus, the memory being for storing programs and data, the processor being for invoking the programs stored by the memory to perform the method of any one of claims 1-9.