CN105049681B - A lens shadow calibration method and user terminal - Google Patents

Abstract

The embodiment of the invention discloses a lens shadow calibration method and a user terminal, wherein the method comprises the following steps: receiving an input shooting instruction; responding to the shooting instruction, starting a flash lamp and shooting a picture to obtain a shot picture; acquiring a target sensitization value used when a picture is shot; acquiring a target lens shade calibration parameter group corresponding to a sensitization value range to which the target sensitization value belongs according to a corresponding relation between a preset sensitization value range and a lens shade calibration parameter group; and performing lens shading calibration on the shot picture obtained by shooting by using the lens shading calibration parameters included in the target lens shading calibration parameter group. Therefore, the embodiment of the invention can calibrate the pictures with different shooting distances by using different lens shadow calibration parameter sets, thereby achieving better calibration effect.

Description

A lens shadow calibration method and user terminal

technical field

The present invention relates to the field of electronic technology, in particular to a lens shadow calibration method and a user terminal.

Background technique

In real life, users often use smart terminals (such as smart phones, tablet computers, etc.) to take pictures, and when the ambient light is not good, users often turn on the flash to take pictures. Although turning on the flash can increase the light in the environment, it is also easy to cause the center of the captured picture to be overexposed and the surrounding areas to be underexposed, so that the color of the center of the picture is different from that of the surrounding areas (for example, the center is blue and the surrounding area is red). This phenomenon is called shading phenomenon, the lens shading phenomenon. In the prior art, in order to improve this phenomenon, a set of lens shading calibration parameters are used to perform lens shading calibration on the picture. However, when the calibration intensity of the lens shading calibration parameters used is high, although a good calibration effect is obtained for close-range pictures, the noise of the distant-view pictures will be large when the calibration is performed on distant-view pictures. When the calibration intensity of the lens shading calibration parameter is small, the calibration effect of the close-range picture and the distant-view picture is not satisfactory. Therefore, it is difficult to use a set of lens shading calibration parameters to adapt to pictures at different shooting distances.

Contents of the invention

The embodiment of the present invention discloses a lens shadow calibration method and a user terminal, which can use different lens shadow calibration parameter groups to calibrate pictures at different shooting distances to achieve a better calibration effect.

The first aspect of the embodiment of the present invention discloses a lens shadow calibration method, the method comprising:

Receive input shooting instructions;

Responding to the shooting instruction, start the flashlight and take pictures, so as to obtain the pictures;

Obtain the target sensitivity value used when taking pictures;

Acquiring a target lens shading calibration parameter set corresponding to the sensitivity value range to which the target sensitivity value belongs according to the preset corresponding relationship between the sensitivity value range and the lens shadow calibration parameter set;

Using the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the photographed picture.

In a first possible implementation manner of the first aspect of the embodiment of the present invention, the sensitivity value range includes a first sensitivity value range, a second sensitivity value range and a third sensitivity value range, wherein the second The sensitivity values included in the sensitivity value range are all greater than the sensitivity values included in the first sensitivity value range, and the sensitivity values included in the third sensitivity value range are all greater than the sensitivity values included in the second sensitivity value range.

With reference to the first possible implementation of the first aspect of the embodiment of the present invention, in the second possible implementation of the first aspect of the embodiment of the present invention, in the preset sensitivity value range and the lens shading calibration parameter set In the corresponding relationship, the first sensitivity value range corresponds to the lens shading calibration parameter set R1, the second sensitivity value range corresponds to the lens shading calibration parameter set R2, and the third sensitivity value range corresponds to the lens shading calibration parameter set R3, wherein, the lens shading calibration parameter r2 included in the lens shading calibration parameter group R2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1), the S2 is the first The minimum sensitivity value of the three sensitivity value ranges, the S1 is the maximum sensitivity value of the first sensitivity value range, the S is the target sensitivity value, and the r1 is the lens shadow calibration parameter The lens shading calibration parameters included in the group R1, and the r3 is the lens shading calibration parameters included in the lens shading calibration parameter group R3.

With reference to the second possible implementation of the first aspect of the embodiments of the present invention, in the third possible implementation of the first aspect of the embodiments of the present invention, the calibration parameters based on the preset range of sensitivity values and lens shading The corresponding relationship of the group, to obtain the target lens shadow calibration parameter group corresponding to the sensitivity value range to which the target sensitivity value belongs, including:

judging whether the target sensitivity value is less than or equal to the S1;

When the target sensitivity value is less than or equal to the S1, determine that the sensitivity value range to which the target sensitivity value belongs is the first sensitivity value range;

According to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set, the lens shading calibration parameter set R1 corresponding to the first sensitivity value range is acquired as the target lens shading calibration parameter set.

With reference to the third possible implementation manner of the first aspect of the embodiments of the present invention, in the fourth possible implementation manner of the first aspect of the embodiments of the present invention, the method further includes:

When the target sensitivity value is greater than the S1, determine whether the target sensitivity value is greater than or equal to the S2;

When the target sensitivity value is greater than or equal to the S2, determine that the sensitivity value range to which the target sensitivity value belongs is a third sensitivity value range;

According to the correspondence between the preset sensitivity value range and the lens shading calibration parameter group, obtain the lens shading calibration parameter group R3 corresponding to the third sensitivity value range as the target lens shading calibration parameter group;

When the target sensitivity value is less than the S2, determine that the sensitivity value range to which the target sensitivity value belongs is a second sensitivity value range;

According to the preset corresponding relationship between the sensitivity value range and the lens shading calibration parameter set, the lens shading calibration parameter set R2 corresponding to the second sensitivity value range is obtained as the target lens shading calibration parameter set.

The second aspect of the embodiment of the present invention discloses a user terminal, and the user terminal includes:

A receiving module, configured to receive input shooting instructions;

The photographing module is used to respond to the photographing instruction, start the flashlight and take pictures, so as to obtain photographs;

The first acquisition module is used to acquire the target sensitivity value used when taking pictures;

The second acquisition module is used to acquire the target lens shading calibration parameter group corresponding to the sensitivity value range to which the target sensitivity value belongs according to the preset corresponding relationship between the sensitivity value range and the lens shadow calibration parameter group;

A calibration module, configured to use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the photographed picture.

In a first possible implementation manner of the second aspect of the embodiment of the present invention, the sensitivity value range includes a first sensitivity value range, a second sensitivity value range and a third sensitivity value range, wherein the second The sensitivity values included in the sensitivity value range are all greater than the sensitivity values included in the first sensitivity value range, and the sensitivity values included in the third sensitivity value range are all greater than the sensitivity values included in the second sensitivity value range.

With reference to the first possible implementation of the second aspect of the embodiment of the present invention, in the second possible implementation of the second aspect of the embodiment of the present invention, the preset sensitivity value range and the lens shading calibration parameter set In the corresponding relationship, the first sensitivity value range corresponds to the lens shading calibration parameter set R1, the second sensitivity value range corresponds to the lens shading calibration parameter set R2, and the third sensitivity value range corresponds to the lens shading calibration parameter set R3, wherein, the lens shading calibration parameter r2 included in the lens shading calibration parameter group R2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1), the S2 is the first The minimum sensitivity value of the three sensitivity value ranges, the S1 is the maximum sensitivity value of the first sensitivity value range, the S is the target sensitivity value, and the r1 is the lens shadow calibration parameter The lens shading calibration parameters included in the group R1, and the r3 is the lens shading calibration parameters included in the lens shading calibration parameter group R3.

With reference to the second possible implementation manner of the second aspect of the embodiments of the present invention, in the third possible implementation manner of the first aspect of the embodiments of the present invention, the second obtaining module includes:

A first judging unit, configured to judge whether the target sensitivity value is less than or equal to the S1;

A determining unit, configured to determine that the target sensitivity value range belongs to the first sensitivity value range when the first judging unit determines that the target sensitivity value is less than or equal to the S1;

The acquiring unit is configured to acquire the lens shading calibration parameter set R1 corresponding to the first sensitivity value range as the target lens shading calibration parameter set according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

With reference to the third possible implementation manner of the second aspect of the embodiments of the present invention, in the fourth possible implementation manner of the first aspect of the embodiments of the present invention, the second obtaining module further includes:

A second judgment unit, configured to judge whether the target sensitivity value is greater than or equal to the S2 when the first judgment unit judges that the target sensitivity value is greater than the S1;

The determination unit is further configured to determine that the target sensitivity value range to which the target sensitivity value belongs is a third sensitivity value range when the second judgment unit determines that the target sensitivity value is greater than or equal to the S2 ;

The acquisition unit is further configured to acquire the lens shading calibration parameter group R3 corresponding to the third sensitivity value range as the target lens shading calibration parameter according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter group Group;

The determining unit is further configured to, when the second judging unit judges that the target sensitivity value is smaller than the S2, determine that the sensitivity value range to which the target sensitivity value belongs is the second sensitivity value range;

The acquiring unit is further configured to acquire the lens shading calibration parameter set R2 corresponding to the second sensitivity value range as the target lens shading calibration parameter according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set Group.

In the embodiment of the present invention, after the user terminal receives the input shooting instruction, it will respond to the shooting instruction, start the flashlight and take a picture to obtain a picture; the user terminal will obtain the target sensitivity value used when taking the picture, and Obtain a target lens shading calibration parameter set corresponding to the sensitivity value range to which the target sensitivity value belongs according to the preset corresponding relationship between the sensitivity value range and the lens shading calibration parameter set; the user terminal uses the target lens shading calibration parameter set The included lens shading calibration parameters are used to perform lens shading calibration on the photographed picture. It can be seen that, implementing the embodiment of the present invention can use different lens shadow calibration parameter sets to calibrate pictures at different shooting distances to achieve a better calibration effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a schematic flow chart of a lens shading calibration method disclosed in an embodiment of the present invention;

FIG. 2 is a schematic flowchart of another lens shading calibration method disclosed in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a user terminal disclosed in an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another user terminal disclosed in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention discloses a lens shadow calibration method and a user terminal, which can use different lens shadow calibration parameter groups to calibrate pictures at different shooting distances to achieve a better calibration effect. Each will be described in detail below.

Please refer to FIG. 1 , which is a schematic flowchart of a method for calibrating lens shading disclosed in an embodiment of the present invention. As shown in FIG. 1 , the lens shading calibration method may include the following steps.

S101. Receive an input shooting instruction.

In the embodiment of the present invention, the input shooting instruction is received by the user terminal. Wherein, the user terminal may include but not limited to a smart phone, a tablet computer, a notebook computer, a desktop computer, and other user terminals with a camera function. The operating system of the user terminal may include but not limited to Android operating system, IOS operating system, Symbian (Symbian) operating system, Black Berry (Blackberry) operating system, Windows operating system, etc., which are not limited in the embodiment of the present invention.

Optionally, the user may input a shooting instruction by operating hardware buttons and application icons provided on the user terminal. Optionally, the shooting instruction may also be sent through a third-party application program, for example, an application for posting pictures, talk about it, etc., which is not limited in this embodiment of the present invention.

S102. In response to the shooting instruction, start a flash and take a picture, so as to obtain a picture.

In the embodiment of the present invention, after receiving an input shooting instruction, the user terminal will respond to the shooting instruction, start a flashlight and take a picture, so as to obtain a shot picture.

S103. Acquire a target sensitivity value used when taking pictures.

In the embodiment of the present invention, the user terminal will acquire the target sensitivity value used when taking pictures.

S104. Acquire a target lens shading calibration parameter set corresponding to the sensitivity value range to which the target sensitivity value belongs according to the preset correspondence between the sensitivity value range and the lens shadow calibration parameter set.

In the embodiment of the present invention, after the user terminal acquires the target sensitivity value used when taking pictures, it will acquire the sensitivity value to which the target sensitivity value belongs according to the corresponding relationship between the preset sensitivity value range and the lens shadow calibration parameter group. Target lens shadow calibration parameter group corresponding to the degree value range.

In the embodiment of the present invention, the user terminal is preset with a corresponding relationship between the sensitivity value range and the lens shading calibration parameter set. Wherein, a sensitivity value range corresponds to a lens shading calibration parameter set.

In practical applications, when the user terminal is shooting, the distances between the shooting object and the user terminal are different, and the sensitivity values used by the user terminal are different when shooting. The farther the subject is, the greater the sensitivity value used by the user terminal is; the closer the subject is, the smaller the sensitivity value used by the user terminal. Therefore, it can be judged whether the user terminal is taking a close-range picture or a distant-view picture according to the sensitivity value used when the user terminal takes pictures.

For example, if the sensitivity value S1 is the maximum sensitivity value used for taking close-up pictures, then when the user terminal takes pictures, if the sensitivity value used is less than or equal to the sensitivity value S1, it can be determined that the photos taken by the user terminal The picture is a close-up picture. If the sensitivity value S2 is the minimum sensitivity value used for taking pictures of distant scenery, then when the user terminal takes a picture, if the sensitivity value used is greater than or equal to the sensitivity value S2, it can be determined that the picture taken by the user terminal is Vision picture.

In the embodiment of the present invention, a sensitivity value range corresponds to a lens shading calibration parameter set, because the shooting distance has a corresponding relationship with the sensitivity value, therefore, different lens shading calibration parameter sets can be used for lens shading calibration for pictures at different shooting distances .

It has been found in practice that the greater the calibration strength of the lens shading calibration parameters used, the better the calibration. However, when the user terminal takes a distant view picture, because it uses a large sensitivity value, the captured distant view picture has a lot of color noise; Causes more colored noise.

Therefore, in the embodiment of the present invention, if the sensitivity value included in the first sensitivity value range is the sensitivity value used for shooting close-up pictures, the user terminal can set the first sensitivity value range to correspond to the lens shadow with higher calibration intensity. Calibration parameter group, to use lens shadow calibration parameters with higher calibration intensity to perform lens shadow calibration on close-range pictures, so as to achieve a good calibration effect on close-range pictures; at the same time, if the sensitivity value included in the second sensitivity value range is The sensitivity value used by the picture, the user terminal can set the second sensitivity value range corresponding to the lens shading calibration parameter group with a smaller calibration intensity, so as to use the lens shading calibration parameters with a lower calibration intensity to perform lens shading calibration on the distant view picture, In order to avoid causing more color noise in the distant picture.

In the embodiment of the present invention, a set of lens shading calibration parameters includes a plurality of lens shading calibration parameters. Since a pixel has four color channels, namely R, GR, GB and B color channels, the embodiment of the present invention divides the lens shading calibration parameters included in one lens shading calibration parameter set into four parts. Among them, the first part of the lens shading calibration parameters is used to calibrate the value of the R channel, the second part of the lens shading calibration parameters is used to calibrate the value of the GR channel, the third part of the lens shading calibration parameters is used to calibrate the value of the GB channel, and the fourth part of the lens The shadow calibration parameter is used to calibrate the value of the B channel. Each part has the same number of lens shading calibration parameters.

In the embodiment of the present invention, optionally, the user terminal divides the photographed picture into 130 blocks. Therefore, a lens shading calibration parameter set consists of 520 lens shading calibration parameters, among which 130 lens shading calibration parameters are used to calibrate the value of the R channel, 130 lens shading calibration parameters are used to calibrate the value of the GR channel, and 130 lens shading calibration parameters are used to calibrate the value of the GR channel. The shadow calibration parameters are used to calibrate the value of the GB channel, and the 130 lens shadow calibration parameters are used to calibrate the value of the B channel.

S105. Use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the captured picture.

In the embodiment of the present invention, after acquiring the target lens shading calibration parameter set, the user terminal will use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the captured pictures.

For example, when the user terminal divides the captured picture into 130 blocks, each block corresponds to four color channels R, GR, GB and B. Each block corresponds to four shadow calibration parameters included in the target lens shadow calibration parameter group, and these four shadow calibration parameters are respectively used to calibrate the values of the four channels. If the user terminal detects the first block of the picture and finds that the value of the R channel is greater than the normal value, the user terminal can use the lens shading calibration parameters corresponding to the first block of the picture for calibrating the value of the R channel to calibrate the value of the R channel. The value is calibrated, and the value of the R channel is changed to a normal value. Or, the user terminal may use the lens shading calibration parameters corresponding to the first block of the picture for calibrating the values of other channels to increase the values of other channels, so that the values of each channel are balanced. By analogy, 130 blocks, each of which is calibrated in this way.

In this embodiment of the present invention, optionally, after the user terminal uses the lens shading calibration parameters included in the target lens shading calibration parameter group to perform lens shading calibration on the captured pictures, it will output the calibrated pictures so that the user can view The calibrated captured picture; or the user terminal may store the calibrated captured picture after performing lens shading calibration on the captured captured picture using the lens shading calibration parameters included in the target lens shading calibration parameter set.

In the method described in Figure 1, after the user terminal receives the input shooting instruction, it will respond to the shooting instruction, start the flashlight and take a picture to obtain a picture; the user terminal will obtain the target sensitivity value used when taking the picture , and according to the preset corresponding relationship between the sensitivity value range and the lens shading calibration parameter group, obtain the target lens shading calibration parameter group corresponding to the sensitivity value range to which the target sensitivity value belongs; the user terminal uses the target lens shading calibration The lens shading calibration parameters included in the parameter group are used to calibrate the lens shading of the photographed picture. It can be seen that, implementing the embodiment of the present invention can use different lens shadow calibration parameter sets to calibrate pictures at different shooting distances to achieve a better calibration effect.

Please refer to FIG. 2 . FIG. 2 is a schematic flowchart of another method for calibrating lens shading disclosed by an embodiment of the present invention. As shown in FIG. 2 , the lens shading calibration method may include the following steps.

S201. Receive an input shooting instruction.

S202. In response to the photographing instruction, start a flashlight and take a picture, so as to obtain a photographed picture.

S203. Acquire a target sensitivity value used when taking pictures.

S204. Determine whether the target sensitivity value is less than or equal to the sensitivity value S1.

In the embodiment of the present invention, the user terminal is preset with three sensitivity value ranges, namely the first sensitivity value range, the second sensitivity value range and the third sensitivity value range, wherein the second sensitivity value range includes The sensitivity values are all greater than the sensitivity values included in the first sensitivity value range, and the sensitivity values included in the third sensitivity value range are all greater than the sensitivity values included in the second sensitivity value range. Wherein, the sensitivity value S1 is the maximum value of the first sensitivity value range, and the sensitivity value S2 is the minimum value of the third sensitivity value range. Wherein, the sensitivity value included in the first sensitivity value range is the sensitivity value used for shooting the close-range picture, and the sensitivity value included in the third sensitivity value range is the sensitivity value used for shooting the distant view picture.

In the embodiment of the present invention, after the user terminal acquires the target sensitivity value used when taking pictures, it will determine the preset sensitivity value range to which the target sensitivity value belongs. Specifically, the user terminal will determine whether the target sensitivity value is less than or equal to the sensitivity value S1.

In the embodiment of the present invention, when the user terminal determines that the target sensitivity value is less than or equal to the sensitivity value S1, step S205 is executed. When the user terminal determines that the target sensitivity value is greater than the sensitivity value S1, step S207 is performed.

S205. Determine that the sensitivity value range to which the target sensitivity value belongs is the first sensitivity value range.

S206. Acquire a lens shading calibration parameter set R1 corresponding to the first sensitivity value range as a target lens shading calibration parameter set according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

In the embodiment of the present invention, the user terminal is preset with a corresponding relationship between the sensitivity value range and the lens shading calibration parameter set. Wherein, the first sensitivity value range corresponds to the lens shading calibration parameter set R1, the second sensitivity value range corresponds to the lens shading calibration parameter set R2, and the third sensitivity value range corresponds to the lens shading calibration parameter set R3. Wherein, the lens shading calibration parameter set R2 includes lens shading calibration parameters r2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1). Wherein, S is the target sensitivity value, r1 is the lens shading calibration parameter included in the lens shading calibration parameter group R1, and r3 is the lens shading calibration parameter included in the lens shading calibration parameter group R3.

S207. Determine whether the target sensitivity value is greater than or equal to the sensitivity value S2.

In the embodiment of the present invention, when the user terminal determines that the target sensitivity value is greater than the sensitivity value S1, the user terminal determines whether the target sensitivity value is greater than or equal to the sensitivity value S2. When the user terminal determines that the target sensitivity value is greater than or equal to the sensitivity value S2, step S208 is executed. When the user terminal determines that the target sensitivity value is smaller than the sensitivity value S2, step S210 is executed.

S208. Determine that the sensitivity value range to which the target sensitivity value belongs is a third sensitivity value range.

S209. Acquire a lens shading calibration parameter set R3 corresponding to the third sensitivity value range as a target lens shading calibration parameter set according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

S210. Determine that the sensitivity value range to which the target sensitivity value belongs is a second sensitivity value range.

In the embodiment of the present invention, when the user terminal judges that the target sensitivity value is less than the sensitivity value S2, the user terminal determines that the sensitivity value range to which the target sensitivity value belongs is the second sensitivity value range.

S211. Acquire a lens shading calibration parameter set R2 corresponding to the second sensitivity value range as a target lens shading calibration parameter set according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

In the embodiment of the present invention, the user terminal will obtain the lens shading calibration parameter group R2 corresponding to the second sensitivity value range as the target lens shading calibration according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter group parameter group. Specifically, the user terminal will calculate and obtain the lens shading calibration parameters included in the lens shading calibration parameter group R2 according to the lens shading calibration parameter r1 included in the lens shading calibration parameter group R1 and the lens shading calibration parameter r3 included in the lens shading calibration parameter group R3 r2. A specific calculation formula may be: r2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1). Wherein, S is the target sensitivity value, r1 is the lens shading calibration parameter included in the lens shading calibration parameter group R1, and r3 is the lens shading calibration parameter included in the lens shading calibration parameter group R3.

S212. Use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the captured picture.

In the embodiment of the present invention, different sensitivity value ranges will correspond to different lens shadow calibration parameter groups. The user terminal obtains the sensitivity value range to which the sensitivity value used when shooting belongs, and determines the range of sensitivity values to be used for taking pictures according to the sensitivity value range. The lens shading calibration parameters for . In practical applications, there is a corresponding relationship between the shooting distance and the sensitivity value. The farther the shooting distance is, the larger the sensitivity value is, and the shorter the shooting distance is, the smaller the sensitivity value is. Therefore, by implementing the embodiments of the present invention, the user terminal can use different lens shading calibration parameter sets to calibrate pictures at different shooting distances, achieving a better calibration effect.

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of a user terminal disclosed in an embodiment of the present invention. Wherein, the user terminal shown in FIG. 3 may include a receiving module 301 , a photographing module 302 , a first obtaining module 303 , a second obtaining module 304 and a calibration module 305 . in:

The receiving module 301 is configured to receive an input shooting instruction.

In the embodiment of the present invention, the receiving module 301 of the user terminal receives an input shooting instruction. Wherein, the user terminal may include but not limited to a smart phone, a tablet computer, a notebook computer, a desktop computer, and other user terminals with a camera function. The operating system of the user terminal may include but not limited to Android operating system, IOS operating system, Symbian (Symbian) operating system, Black Berry (Blackberry) operating system, Windows operating system, etc., which are not limited in the embodiment of the present invention.

Optionally, the user may input a shooting instruction by operating hardware buttons and application icons provided on the user terminal. Optionally, the shooting instruction may also be sent through a third-party application program, for example, an application for posting pictures, talk about it, etc., which is not limited in this embodiment of the present invention.

The photographing module 302 is configured to respond to the photographing instruction, start a flash and take pictures, so as to obtain photographed pictures.

In the embodiment of the present invention, after the receiving module 301 receives the input shooting instruction, the shooting module 302 will respond to the shooting instruction, start the flashlight and take pictures, so as to obtain the shooting pictures.

The first obtaining module 303 is configured to obtain a target sensitivity value used when the shooting module 302 takes pictures.

The second acquisition module 304 is configured to acquire a target lens shading calibration parameter set corresponding to the sensitivity value range to which the target sensitivity value belongs according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

In the embodiment of the present invention, after the first acquisition module 303 acquires the target sensitivity value used when taking pictures, the second acquisition module 304 will acquire the corresponding relationship with The target lens shadow calibration parameter group corresponding to the sensitivity value range to which the target sensitivity value belongs.

In the embodiment of the present invention, the user terminal is preset with a corresponding relationship between the sensitivity value range and the lens shading calibration parameter set. Wherein, a sensitivity value range corresponds to a lens shading calibration parameter set.

In practical applications, when the photographing module 302 is photographing, the distance between the photographed object and the user terminal is different, and the sensitivity value used by the user terminal is different when photographing. The farther the subject is, the greater the sensitivity value used by the user terminal is; the closer the subject is, the smaller the sensitivity value used by the user terminal. Therefore, according to the photosensitivity value used by the photographing module 302 when photographing, it can be judged whether the photographing module 302 is capturing a close-up picture or a long-range picture.

For example, if the sensitivity value S1 is the maximum sensitivity value used to take a close-up picture, then when the photographing module 302 takes pictures, if the sensitivity value used is less than or equal to the sensitivity value S1, it can be determined that the image captured by the user terminal is The pictures are close-up pictures. If the sensitivity value S2 is the minimum sensitivity value used for taking pictures of distant scenery, then when the photographing module 302 takes a picture, if the sensitivity value used is greater than or equal to the sensitivity value S2, the picture taken by the user terminal can be determined. For the perspective picture.

In the embodiment of the present invention, a sensitivity value range corresponds to a lens shading calibration parameter set, because the shooting distance has a corresponding relationship with the sensitivity value, therefore, different lens shading calibration parameter sets can be used for lens shading calibration for pictures at different shooting distances .

It has been found in practice that the greater the calibration strength of the lens shading calibration parameters used, the better the calibration. However, when the user terminal takes a distant view picture, because it uses a larger sensitivity value, the captured distant view picture has a lot of color noise; Will cause more colored noise.

Therefore, in the embodiment of the present invention, if the sensitivity value included in the first sensitivity value range is the sensitivity value used for shooting close-up pictures, the user terminal can set the first sensitivity value range to correspond to the lens shadow with higher calibration intensity. Calibration parameter group, to use lens shadow calibration parameters with higher calibration intensity to perform lens shadow calibration on close-range pictures, so as to achieve a good calibration effect on close-range pictures; at the same time, if the sensitivity value included in the second sensitivity value range is The sensitivity value used by the picture, the user terminal can set the second sensitivity value range corresponding to the lens shading calibration parameter group with a smaller calibration intensity, so as to use the lens shading calibration parameters with a lower calibration intensity to perform lens shading calibration on the distant view picture, In order to avoid causing more color noise in the distant picture.

In the embodiment of the present invention, a set of lens shading calibration parameters includes a plurality of lens shading calibration parameters. Since a pixel has four color channels, namely R, GR, GB and B color channels, the embodiment of the present invention divides the lens shading calibration parameters included in one lens shading calibration parameter set into four parts. Among them, the first part of the lens shading calibration parameters is used to calibrate the value of the R channel, the second part of the lens shading calibration parameters is used to calibrate the value of the GR channel, the third part of the lens shading calibration parameters is used to calibrate the value of the GB channel, and the fourth part of the lens The shadow calibration parameter is used to calibrate the value of the B channel. Each part has the same number of lens shading calibration parameters.

In the embodiment of the present invention, optionally, the user terminal divides the photographed picture into 130 blocks. Therefore, a lens shading calibration parameter set consists of 520 lens shading calibration parameters, among which 130 lens shading calibration parameters are used to calibrate the value of the R channel, 130 lens shading calibration parameters are used to calibrate the value of the GR channel, and 130 lens shading calibration parameters are used to calibrate the value of the GR channel. The shadow calibration parameters are used to calibrate the value of the GB channel, and the 130 lens shadow calibration parameters are used to calibrate the value of the B channel.

The calibration module 305 is configured to use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the photographed picture obtained by the photographing module 302 .

In the embodiment of the present invention, after the second acquisition module 304 acquires the target lens shading calibration parameter set, the calibration module 305 will use the lens shading calibration parameters included in the target lens shading calibration parameter set to perform lens shading calibration on the pictures captured by the shooting module 302 .

For example, when the user terminal divides the captured picture into 130 blocks, each block corresponds to four color channels R, GR, GB and B. Each block corresponds to four shadow calibration parameters included in the target lens shadow calibration parameter group, and these four shadow calibration parameters are respectively used to calibrate the values of the four channels. If the user terminal detects the first block of the picture and finds that the value of the R channel is greater than the normal value, then the calibration module 305 can use the lens shading calibration parameters corresponding to the first block of the picture for calibrating the value of the R channel to correct the R channel Calibrate the value of the R channel and change the value of the R channel to a normal value. Or, the calibration module 305 may use the lens shading calibration parameters corresponding to the first block of the picture for calibrating the values of other channels to increase the values of other channels, so that the values of each channel are balanced. By analogy, 130 blocks, each of which is calibrated in this way.

In the embodiment of the present invention, optionally, after the calibration module 305 uses the lens shading calibration parameters included in the target lens shading calibration parameter group to perform lens shading calibration on the captured pictures, the user terminal will output the calibrated pictures to Allow the user to view the calibrated pictures; or the calibration module 305 uses the lens shading calibration parameters included in the target lens shading calibration parameter group to perform lens shading calibration on the captured pictures, and the user terminal can store the calibrated pictures .

Please also refer to FIG. 4 . FIG. 4 is a schematic structural diagram of another user terminal disclosed in an embodiment of the present invention. Wherein, the user terminal shown in FIG. 4 is obtained by optimizing the user terminal shown in FIG. 3 . Compared with the user terminal shown in FIG. 3, the user terminal shown in FIG. 4 includes all modules of the user terminal shown in FIG. 3, and the second acquisition module 304 of the user terminal shown in FIG. 4 may include: the first A judging unit 3041 , a determining unit 3042 , an acquiring unit 3043 and a second judging unit 3044 .

The first judging unit 3041 is configured to judge whether the target sensitivity value is less than or equal to the sensitivity value S1.

In the embodiment of the present invention, the user terminal presets three sensitivity value ranges, namely the first sensitivity value range, the second sensitivity value range and the third sensitivity value range, wherein the second sensitivity value range includes The sensitivity values are all greater than the sensitivity values included in the first sensitivity value range, and the sensitivity values included in the third sensitivity value range are all greater than the sensitivity values included in the second sensitivity value range. Wherein, the sensitivity value S1 is the maximum value of the first sensitivity value range, and the sensitivity value S2 is the minimum value of the third sensitivity value range. Wherein, the sensitivity value included in the first sensitivity value range is the sensitivity value used for shooting the close-range picture, and the sensitivity value included in the third sensitivity value range is the sensitivity value used for shooting the distant view picture.

In the embodiment of the present invention, after the first acquisition module 303 acquires the target sensitivity value used when taking pictures, the first determination unit 3041 will determine the preset sensitivity value range to which the target sensitivity value belongs. Specifically, the first judging unit 3041 will judge whether the target sensitivity value is less than or equal to the sensitivity value S1.

A determination unit 3042, configured to determine that the target sensitivity value range to which the target sensitivity value belongs is the first sensitivity value range when the first judging unit 3041 determines that the target sensitivity value is less than or equal to the sensitivity value S1 .

The acquiring unit 3043 is configured to acquire the lens shading calibration parameter set R1 corresponding to the first sensitivity value range as the target lens shading calibration parameter set according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set.

In the embodiment of the present invention, the user terminal is preset with a corresponding relationship between the sensitivity value range and the lens shading calibration parameter set. Wherein, the first sensitivity value range corresponds to the lens shading calibration parameter set R1, the second sensitivity value range corresponds to the lens shading calibration parameter set R2, and the third sensitivity value range corresponds to the lens shading calibration parameter set R3. Wherein, the lens shading calibration parameter set R2 includes lens shading calibration parameters r2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1). Wherein, S is the target sensitivity value, r1 is the lens shading calibration parameter included in the lens shading calibration parameter group R1, and r3 is the lens shading calibration parameter included in the lens shading calibration parameter group R3.

In the embodiment of the present invention, after the determination unit 3042 determines that the sensitivity value range to which the target sensitivity value belongs is the first sensitivity value range, the acquisition unit 3043 according to the correspondence between the preset sensitivity value range and the lens shading calibration parameter group, A lens shading calibration parameter set R1 corresponding to the first sensitivity value range is acquired as a target lens shading calibration parameter set.

The second determining unit 3044 is configured to determine whether the target sensitivity value is greater than or equal to the sensitivity value S2 when the first determining unit 3041 determines that the target sensitivity value is greater than the sensitivity value S1.

The determination unit 3042 is further configured to determine that the target sensitivity value belongs to the third sensitivity value range when the second determination unit 3044 determines that the target sensitivity value is greater than or equal to the sensitivity value S2. degree value range.

The acquisition unit 3043 is further configured to, after the determination unit 3042 determines that the sensitivity value range to which the target sensitivity value belongs is the third sensitivity value range, according to the correspondence between the preset sensitivity value range and the lens shading calibration parameter group and acquiring a lens shading calibration parameter set R3 corresponding to the third sensitivity value range as a target lens shading calibration parameter set.

The determination unit 3042 is further configured to determine that the range of sensitivity values to which the target sensitivity value belongs is the second sensitivity value when the second determination unit 3044 determines that the target sensitivity value is less than the sensitivity value S2 scope.

The acquisition unit 3043 is further configured to, after the determination unit 3042 determines that the sensitivity value range to which the target sensitivity value belongs is the second sensitivity value range, according to the correspondence between the preset sensitivity value range and the lens shading calibration parameter group and acquiring a lens shading calibration parameter set R2 corresponding to the second sensitivity value range as a target lens shading calibration parameter set.

In the embodiment of the present invention, the acquisition unit 3043 will acquire the lens shading calibration parameter set R2 corresponding to the second sensitivity value range as the target lens shading according to the preset correspondence between the sensitivity value range and the lens shading calibration parameter set Calibration parameter set. Specifically, the obtaining unit 3043 will calculate and obtain the lens shading calibration included in the lens shading calibration parameter set R2 according to the lens shading calibration parameter r1 included in the lens shading calibration parameter set R1 and the lens shading calibration parameter r3 included in the lens shading calibration parameter set R3 Parameter r2. A specific calculation formula may be: r2=[(S2-S)*r1+(S-S1)*r3]/(S2-S1). Wherein, S is the target sensitivity value, r1 is the lens shading calibration parameter included in the lens shading calibration parameter group R1, and r3 is the lens shading calibration parameter included in the lens shading calibration parameter group R3.

In the terminals described in Figures 3 to 4, after the receiving module receives the input shooting instruction, the shooting module will respond to the shooting instruction, start the flashlight and take pictures to obtain pictures; The target sensitivity value used in the process; the second acquisition module acquires the target lens shading calibration parameter corresponding to the sensitivity value range to which the target sensitivity value belongs according to the corresponding relationship between the preset sensitivity value range and the lens shading calibration parameter group group; the calibration module uses the lens shading calibration parameters included in the target lens shading calibration parameter group to perform lens shading calibration on the captured picture. It can be seen that, implementing the embodiment of the present invention can use different lens shadow calibration parameter sets to calibrate pictures at different shooting distances to achieve a better calibration effect.

It should be noted that, in the foregoing embodiments, descriptions of each embodiment have their own emphases, and for parts that are not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The steps in the methods of the embodiments of the present invention can be adjusted, combined and deleted according to actual needs.

The modules or units in the user terminal in the embodiment of the present invention can be combined, divided and deleted according to actual needs.

Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing hardware related to the terminal device through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can be Including: a flash disk, a read-only memory (Read-Only Memory, ROM), a random access device (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

A lens shadow calibration method disclosed in the embodiments of the present invention and the user terminal are described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The descriptions of the above embodiments are only used to help understand the present invention. The method of the invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood To limit the present invention.

Claims (6)

1. a kind of camera lens shade calibration method, it is characterised in that methods described includes：

Receive the shooting instruction of input；

The shooting instruction is responded, starts flash lamp and carries out picture shooting, to obtain shooting picture；

Obtain the target sensitivity value for carrying out being used during picture shooting；

According to the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, obtain and the target sensitivity Target camera lens shade calibration parameter set corresponding to sensitivity value scope belonging to value；

The shooting obtained using the camera lens shade calibration parameter that the target camera lens shade calibration parameter set includes to shooting Picture carries out camera lens shade calibration；

Wherein, the sensitivity value scope includes the first sensitivity value scope, the second sensitivity value scope and the 3rd sensitivity value Scope, wherein, the sensitivity value that the second sensitivity value scope includes is all higher than the sensitivity value that the first sensitivity value scope includes, The sensitivity value that 3rd sensitivity value scope includes is all higher than the sensitivity value that the second sensitivity value scope includes；

Wherein, in the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, first sensitivity Value scope corresponds to camera lens shade calibration parameter set R1, and the second sensitivity value scope corresponds to camera lens shade calibration parameter set R2, The 3rd sensitivity value scope corresponds to camera lens shade calibration parameter set R3, wherein, the camera lens shade calibration parameter set R2 bags Camera lens shade calibration parameter r2=[(S2-S) * r1+ (S-S1) * r3]/(S2-S1), the S2 included is the 3rd sensitivity It is worth the minimum sensitivity value of scope, the S1 is the sensitivity maximum value of the first sensitivity value scope, and the S is the mesh Sensitivity value is marked, the r1 is the camera lens shade calibration parameter that the camera lens shade calibration parameter set R1 includes, and the r3 is institute State the camera lens shade calibration parameter that camera lens shade calibration parameter set R3 includes.

2. according to the method for claim 1, it is characterised in that described according to default sensitivity value scope and camera lens shade The corresponding relation of calibration parameter set, it is cloudy to obtain target camera lens corresponding with the sensitivity value scope belonging to the target sensitivity value Shadow calibration parameter set, including：

Judge whether the target sensitivity value is less than or equal to the S1；

When the target sensitivity value is less than or equal to the S1, the sensitivity value model belonging to the target sensitivity value is determined Enclose for the first sensitivity value scope；

According to the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, obtain and first sensitivity It is worth camera lens shade calibration parameter set R1 corresponding to scope as target camera lens shade calibration parameter set.

3. according to the method for claim 2, it is characterised in that methods described also includes：

When the target sensitivity value is more than the S1, judge whether the target sensitivity value is more than or equal to the S2；

When the target sensitivity value is more than or equal to the S2, the sensitivity value model belonging to the target sensitivity value is determined Enclose for the 3rd sensitivity value scope；

According to the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, obtain and the 3rd sensitivity It is worth camera lens shade calibration parameter set R3 corresponding to scope as target camera lens shade calibration parameter set；

When the target sensitivity value is less than the S2, determine sensitivity value scope belonging to the target sensitivity value for the Two sensitivity value scopes；

According to the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, obtain and second sensitivity It is worth camera lens shade calibration parameter set R2 corresponding to scope as target camera lens shade calibration parameter set.

4. a kind of user terminal, it is characterised in that the user terminal includes：

Receiving module, for receiving the shooting instruction of input；

Taking module, for responding the shooting instruction, start flash lamp and carry out picture shooting, to obtain shooting picture；

First acquisition module, the target sensitivity value used when carrying out picture shooting for obtaining；

Second acquisition module, for the corresponding relation according to default sensitivity value scope and camera lens shade calibration parameter set, obtain Take target camera lens shade calibration parameter set corresponding with the sensitivity value scope belonging to the target sensitivity value；

Calibration module, for the camera lens shade calibration parameter that is included using the target camera lens shade calibration parameter set to shooting The shooting picture arrived carries out camera lens shade calibration；

Wherein, the sensitivity value scope includes the first sensitivity value scope, the second sensitivity value scope and the 3rd sensitivity value Scope, wherein, the sensitivity value that the second sensitivity value scope includes is all higher than the sensitivity value that the first sensitivity value scope includes, The sensitivity value that 3rd sensitivity value scope includes is all higher than the sensitivity value that the second sensitivity value scope includes；

Wherein, in the corresponding relation of default sensitivity value scope and camera lens shade calibration parameter set, first sensitivity Value scope corresponds to camera lens shade calibration parameter set R1, and the second sensitivity value scope corresponds to camera lens shade calibration parameter set R2, The 3rd sensitivity value scope corresponds to camera lens shade calibration parameter set R3, wherein, the camera lens shade calibration parameter set R2 bags Camera lens shade calibration parameter r2=[(S2-S) * r1+ (S-S1) * r3]/(S2-S1), the S2 included is the 3rd sensitivity It is worth the minimum sensitivity value of scope, the S1 is the sensitivity maximum value of the first sensitivity value scope, and the S is the mesh Sensitivity value is marked, the r1 is the camera lens shade calibration parameter that the camera lens shade calibration parameter set R1 includes, and the r3 is institute State the camera lens shade calibration parameter that camera lens shade calibration parameter set R3 includes.

5. user terminal according to claim 4, it is characterised in that second acquisition module includes：

First judging unit, for judging whether the target sensitivity value is less than or equal to the S1；

Determining unit, for when first judging unit judges that the target sensitivity value is less than or equal to the S1, really Sensitivity value scope belonging to the fixed target sensitivity value is the first sensitivity value scope；

Acquiring unit, for the corresponding relation according to default sensitivity value scope and camera lens shade calibration parameter set, obtain with Camera lens shade calibration parameter set R1 corresponding to the first sensitivity value scope is as target camera lens shade calibration parameter set.

6. user terminal according to claim 5, it is characterised in that second acquisition module also includes：

Second judging unit, for when first judging unit judges that the target sensitivity value is more than the S1, judging Whether the target sensitivity value is more than or equal to the S2；

The determining unit, it is additionally operable to when second judging unit judges that the target sensitivity value is more than or equal to the S2 When, it is the 3rd sensitivity value scope to determine the sensitivity value scope belonging to the target sensitivity value；

The acquiring unit, the corresponding relation according to default sensitivity value scope and camera lens shade calibration parameter set is additionally operable to, Camera lens shade calibration parameter set R3 corresponding with the 3rd sensitivity value scope is obtained as target camera lens shade calibration parameter Group；

The determining unit, it is additionally operable to when second judging unit judges that the target sensitivity value is less than the S2, really Sensitivity value scope belonging to the fixed target sensitivity value is the second sensitivity value scope；

The acquiring unit, the corresponding relation according to default sensitivity value scope and camera lens shade calibration parameter set is additionally operable to, Camera lens shade calibration parameter set R2 corresponding with the second sensitivity value scope is obtained as target camera lens shade calibration parameter Group.