CN107493686B - A kind of method, apparatus and camera installation setting exposure time - Google Patents

Abstract

A kind of method, apparatus and camera installation setting exposure time, is related to electronics field, can be improved the clarity of photo.The specific scheme is that obtaining jitter parameter (101)；Angle set (103) is obscured according to the jitter parameter prediction theory currently obtained；It is determined and is inhibited than set (104) according to the jitter parameter currently obtained；According to the fuzzy angle set of theory and inhibit than set, according to inhibiting than about theoretical fuzzy angle and inhibiting the function at fuzzy angle, prediction inhibits fuzzy angle set (105)；Fuzzy angle (106) are allowed in acquisition, according to allow fuzzy angle from inhibiting select in fuzzy angle set one of fuzzy angle to be inhibited to obscure angle (107) as target inhibition；It sets target light exposure duration gear (108), target light exposure duration gear is one of at least two exposure time gears that camera installation provides.

Description

A method, device and photographic equipment for setting exposure time

technical field

The invention relates to the field of electronic products, in particular to a method, device and photographic equipment for setting exposure time.

Background technique

Various mobile phones currently on the market usually have the function of taking pictures. In the process of taking pictures, the shaking when the user holds the mobile phone will affect the clarity of the photos. The existing solution is to use an optical image stabilizer (full name in English: Optical Image Stabilization (English abbreviation: OIS) performs jitter compensation to suppress the impact of jitter on imaging.

For example, use the gyroscope to sample information about the shaking of the mobile phone, calculate and determine the amount of shake compensation based on the information, and then drive the camera lens or the photosensitive element in the camera to move according to the compensation amount for shake compensation, or drive both to move simultaneously for shake compensation.

Shake compensation can improve the clarity of photos to a certain extent. During the photographing process, when the shaking frequency and shaking amplitude are fixed, the sharpness of the photo is different due to the different amount of shaking compensation. However, the sharpness of the photo is not only affected by the amount of shake compensation, but also by the exposure time. In the case of a certain amount of shake compensation, if the exposure time is different, the sharpness of the photo will also be different.

Existing photographic devices such as smartphones and digital cameras usually provide different photographing modes, such as night scene mode, portrait mode, etc., and each photographing mode corresponds to a fixed exposure time. Alternatively, the user manually sets the exposure time according to personal experience in the custom mode. Therefore, in the photographic equipment in the prior art, when the photographing mode is determined, regardless of the actual shaking during the photographing process, a fixed exposure time is used, which often leads to poor clarity of the photograph.

Contents of the invention

The present application provides a method, device and photographic equipment for setting exposure time, which can set the most appropriate exposure time gear according to the actual shaking of the photographic equipment during the photographing process, thereby improving the clarity of photos.

In order to achieve the above object, the application adopts the following technical solutions:

In the first aspect, a method for setting the exposure time is provided, which is used to set the target exposure time gear of the camera equipment. The camera equipment provides N exposure time gears, and one exposure time gear corresponds to one exposure time, where N is An integer greater than 1, specifically including:

First, determine the shake parameters according to the shake state of the photographic equipment during the photographing process, and predict the theoretical blur angles corresponding to each of the N exposure time gears, and then predict the N The blur suppression angle corresponding to each exposure time length gear, and select the target blur suppression angle according to the allowable blur angle, and set the exposure time length gear corresponding to the target blur suppression angle as the most suitable exposure time length gear. During the photographing process, the camera equipment predicts the blur angle when the shake compensation function is turned on, that is, the blur suppression angle according to the actual shake situation, and selects from the corresponding blur angle suppression angles of the N exposure time levels according to the allowable blur angle. Choose one of them as the target blur suppression angle, and finally set the target exposure time gear, so as to achieve the purpose of setting the most appropriate exposure time gear according to the actual shaking situation.

In combination with the first aspect, in the first possible implementation mode, a suppression ratio list is stored in the photographing device. During the photographing process, after obtaining the shaking parameters, query the suppression ratio list according to the shaking parameters, and obtain N exposure time long gears The respective suppression ratios. In actual production, the suppression ratio list of a photographic device can be obtained through experimental measurement, and the suppression ratio list can be input into the photographic device.

With reference to the first aspect, in a second possible implementation manner, since the blur suppression angle is mainly affected by the vibration amplitude and the vibration period, the vibration amplitude and the vibration period are used as the vibration parameters. When the jitter amplitude A and the jitter period λ are constant, the value of the theoretical blur angle varies with the exposure start time point t and the exposure time Δt, so the blur angle function is constructed, that is, the blur angle Regarding the functions of t, Δt, A, and λ, and calculating the theoretical blur angle according to the blur angle function, not only the actual jitter situation is considered, but also the influence of the exposure start time point t and the exposure duration Δt on the blur angle .

In combination with the second possible implementation, in the third possible implementation, the theoretical blur angle corresponding to an exposure time gear is, when the exposure time Δt is the exposure time corresponding to the exposure time gear, the blur The ratio of the integral of the angular function within a dithering period λ with respect to the exposure start time point t to the dithering period λ. Since the fuzzy angle function is a periodic function, the ratio of the integral of the fuzzy angle function within a dithering period λ to the dithering period λ reflects the average level of the theoretical fuzzy angle.

Combined with the second possible implementation, in the fourth possible implementation, the theoretical blur angle corresponding to an exposure time gear is, when the exposure time Δt is the exposure time corresponding to the exposure time gear, the blur The average value of P sampling values of the angle function in a jitter period λ. Since the fuzzy angle function is a periodic function, the average value of the sampled values of the fuzzy angle function within a jitter period λ also reflects the average level of the theoretical fuzzy angle.

In the second aspect, a device for setting the exposure time is provided, which is used to implement the method for setting the exposure time provided in the first aspect.

In the third aspect, another device for setting the exposure time is provided, which is used to implement the method for setting the exposure time provided in the first aspect.

In a fourth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores program codes. When the program codes are executed, the method for setting the exposure duration provided in the first aspect is realized.

The fifth aspect provides a photographic device, including the device for setting the exposure time provided in the second aspect or the third aspect.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only illustrations of the present invention. For some embodiments, 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 method for setting exposure duration provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the variation of the shaking angle with time in an embodiment of the present invention;

Fig. 3 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 4 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 5 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 6 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 7 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 8 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 10 is a schematic diagram illustrating the blur angle in an embodiment of the present invention;

Fig. 11 is a schematic diagram illustrating the fuzzy distance in the embodiment of the present invention;

Fig. 12 is a schematic illustration of the minimum resolvable angle of the human eye in an embodiment of the present invention;

Fig. 13 is a schematic illustration of the diameter of the minimum detectable blur range when the human eye observes a picture in an embodiment of the present invention;

Fig. 14 is a schematic diagram illustrating the calculation method of the allowable blur angle in the embodiment of the present invention;

FIG. 15 is a schematic diagram illustrating another calculation method of the allowable blur angle in an embodiment of the present invention;

Fig. 16 is a schematic diagram of the variation curve of the experimental value of the blur suppression angle with the exposure time provided by the embodiment of the present invention;

Fig. 17 is a schematic diagram illustrating the target suppression blur angle in an embodiment of the present invention;

FIG. 18 is another schematic diagram illustrating the target suppression blur angle in an embodiment of the present invention;

FIG. 19 is a schematic diagram illustrating the exposure start time point in an embodiment of the present invention;

Fig. 20 is a schematic structural diagram of a device for setting exposure time provided by an embodiment of the present invention;

FIG. 21 is a schematic structural diagram of another device for setting the exposure time provided by the embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a method and device for setting the exposure time, and a camera device. The camera device may be a device with a camera function such as a mobile phone, a tablet computer, or a digital camera.

The photographic device provides N exposure time gears, one exposure time gear corresponds to one exposure time, where N is an integer greater than 1. For example, as shown in Table 1, the number of exposure duration levels is 8, and the corresponding exposure duration ranges from 1/2 second to 1/32 second.

Table I

Exposure time gear 1 2 3 4 5 6 7 8 Exposure time (seconds) 1/2 1/4 1/8 1/10 1/12 1/16 1/20 1/32

During the photographing process, the photographic device sets one of the N exposure time gears as the target exposure time gear according to its actual shaking condition, and then starts the exposure process. The exposure duration is the exposure duration corresponding to the target exposure duration gear. During each photographing process, the photographic equipment can set the target exposure time gear according to the actual shaking situation, so as to obtain photos with better clarity.

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 only some, not all, embodiments of the present invention. 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.

Example

An embodiment of the present invention provides a method for setting the exposure time, which is used to set the target exposure time gear of the photographic equipment. The photographic equipment provides N exposure time gears, and one exposure time gear corresponds to one exposure time, where N It is an integer greater than 1, as shown in Figure 1, including the following steps:

101. Acquire a jitter parameter.

Wherein, the shaking parameter is used to indicate the shaking state of the photographing device during the photographing process. The shaking parameters may specifically include parameters indicating the acceleration and inclination of the camera in different directions, which may be sampled by a motion sensor. The motion sensor may include at least one of devices such as a three-axis gyroscope, a six-axis gyroscope, and an accelerometer.

Optionally, the shaking parameters include the shaking amplitude and shaking period of the photographing device during the photographing process. Shake amplitude refers to the maximum value of lens shake angle during the shake process of camera equipment.

The jitter angle is a function of time, as shown in Figure 2, the jitter angle Among them, A is the shaking amplitude, λ is the shaking period, and t is the time. The function of the jitter angle y with respect to time t is called a jitter wave function, and the jitter wave function may also include the initial phase of t. For the convenience of calculation, the embodiment of the present invention takes the case where the initial phase is 0 for illustration.

Certainly, the jitter wave function may also be in other forms, such as a cosine function or others. The present invention does not limit the specific form, and only uses the sine function as an example for illustration.

In actual situations, the jitter angle of the photographic equipment may be the result of the superposition and synthesis of multiple jitter wave functions. Different shake periods (jitter frequencies) have different effects on the clarity of the photo. By processing the original signal sensed by the motion sensor, the signal corresponding to the shake that has the greatest impact on the clarity of the photo can be screened out.

For example, the original signal sensed by the motion sensor is usually an analog signal. After being converted by a digital converter, the digital signal is Fourier transformed to obtain a set of digital signals with different jitter periods. The digital signal after Fourier transform is screened through a band-pass filter to filter out the frequency signal that has little influence on the definition, and keep the frequency signal that has a great influence on the definition. Finally, according to the digital signal after band-pass filtering, determine the jitter amplitude and jitter period.

102. Obtain a photographing instruction of the user.

The photographing instruction is used to instruct the photographing device to start the photographing process. For example, the camera instruction can be triggered when the user presses the camera button, and the camera button can be a physical button or a virtual button.

The order of step 101 and step 102 is variable. For example, step 101 precedes step 102. For example, the camera device is a smart phone, and when the user opens the camera application program, the camera device starts to sample shake parameters. Alternatively, step 102 precedes step 101. When the user opens the camera application program, the camera device does not sample the shaking parameters temporarily, and when the user presses the camera key, it begins to sample the shaking parameters.

103. Predict a set of theoretical blur angles according to the currently acquired jitter parameters.

<1>, fuzzy angle

use represents the blur angle, is the cumulative change of the lens shake angle during the exposure process. Generally, the smaller the blur angle, the better the clarity of the photo. FIG. 3 is a schematic diagram illustrating the blur angle, the exposure time is Δt, and the exposure start time points are t_0, t_1 and t_2 respectively. The widths of rectangle 301, rectangle 302, and rectangle 303 are all Δt, and the part of the shake wave function within the respective width ranges of the three rectangles represents the change track of the lens shake angle during the exposure process, and the change amount of the shake angle is always positive, namely The value of is always positive.

When the time point t_0 is the exposure start time point, during the exposure process, the shaking angle y increases monotonously, at this time The size is the height of the rectangle 301,

When the t_1 or t_2 time point is the exposure start time point, during the exposure process, the jitter angle y is a non-monotonic function, which needs to be calculated separately in each monotone interval and sum the cumulative change of the shake angle during the whole exposure process.

Specifically, when the time point t_1 is the exposure start time point, the shake angle of the lens reaches the maximum value (shake amplitude) at the time point t_3, and (t_3-t_2)<Δt. From the time point t_1 to the time point t_3, the change amount of the lens shake angle is equal to the height of the rectangle 302 , and from the time point t_3 to the end of the exposure, the change amount of the lens shake angle is also equal to the height of the rectangle 302 . therefore The size of is twice the height of the rectangle 302 .

When the t_2 time point is the exposure start time point, the lens shake angle first reaches the maximum value during the exposure process, then decreases, and decreases to the same level as the t_2 time point at the t_4 time point, and further decreases until the end of the exposure .

The change amount of the lens shake angle from the time point t_2 to the time point t_4 is calculated in the same way as when the exposure start time point is the time point t_1, and will not be repeated here.

From the time point t_4 to the end of the exposure, the change amount of the lens shake angle is the height of the rectangle 303 . The magnitude of is the sum of the variation from time t_2 to time t_4 and the variation from time t_4 to the end of exposure.

Figure 4 shows the case where the blur angle reaches the maximum. When the exposure time is greater than or equal to the jitter period λ, the trajectory of the lens jitter angle may sweep the maximum value twice during the exposure process. In this case The value of is 2A. The width of the rectangle 401 in FIG. 4 is greater than the shaking period λ, and the height is 2A.

<1.1>, fuzzy angle function

As shown in Figure 3, when the dithering wave function is determined, when the exposure time is constant, if the exposure start time point is different, the blur angle of different sizes. The embodiments of the present invention use the blur angle function to express the relationship between the blur angle and the shaking amplitude, shaking period, exposure start time point, and exposure duration, that is, the blur angle function is a multivariate function related to the above four physical quantities.

Optionally, a fuzzy angle function is constructed from the dither amplitude and dither period to represents the fuzzy angle function, is the blur angle, t is the exposure start time point, and Δt is the exposure time. A and λ are the shaking parameters (shaking amplitude and shaking period) currently obtained by the camera equipment, which are constants, that is to say, after the shaking parameters are determined, the blur angle is only related to the exposure start time point and the exposure duration, so the blur angle function can also be abbreviated as

<1.1.1>, periodicity of fuzzy angle function

The jitter wave function y is a periodic function about the exposure start time point t. As shown in FIG. 5 , t_5=t_0+λ, then y(t=t_5)=y(t=t_0). When the exposure time is constant, the blur angle when t_0 is the exposure start time point is equal to the blur angle when t_0+λ is the exposure start time point. That is, the height of the rectangle 504 is equal to the height of the rectangle 501, Therefore the blur angle It is also a periodic function about the exposure start time point t.

Furthermore, the blur angle It is used to measure the variation of the shaking angle, and its value is always positive. The blur angle when the exposure start time point is t_0 is equal to the blur angle when the exposure start time point is t_0+λ/2. As shown in FIG. 5, t_6=t_0+λ/2, the height of the rectangle 305 is equal to the height of the rectangle 301, Therefore the blur angle function is a periodic function with a period of λ/2 with respect to t, and its period with respect to t is half of the jitter period λ.

<1.1.2>, specific form of fuzzy angle function

Since the blur angle function is a periodic function with respect to t with a period of λ/2, the embodiments of the present invention take one period for description. Specifically, taking the case of the interval t∈[0,λ/2] as an example, the specific expression form of the dithering wave function is explained:

<1.1.2.1>, The fuzzy angle function when

Combined with Figure 6, when , the change track of the lens shake angle during the exposure process is the part within the width range of the rectangle 601 .

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 602 .

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 603 .

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 604 .

<1.1.2.2>, The fuzzy angle function when

Combined with Figure 7, when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 701 .

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 702 .

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 703 .

<1.1.2.3>, The fuzzy angle function when

Combined with Figure 8, when , the change track of the lens shake angle during the exposure process is the part within the width range of the rectangle 801 .

when When , the locus of the lens shake angle sweeps the maximum value twice during the exposure process, in this case The value of is 2A.

when , the change track of the lens shake angle during the exposure process is the part within the width range of the rectangle 802 .

when , the change track of the lens shake angle during the exposure process is the part within the width range of the rectangle 803 .

<1.1.2.4>, The fuzzy angle function when

Combined with Figure 9, when When , the locus of the lens shake angle sweeps the maximum value twice during the exposure process, in this case The value of is 2A.

when , the change track of the lens shake angle during the exposure process is a part within the width range of the rectangle 901 .

when , the change track of the lens shake angle during the exposure process is the part within the width range of the rectangle 902 .

when When , the locus of the lens shake angle sweeps the maximum value twice during the exposure process, in this case The value of is 2A.

<1.1.2.5>, ambiguity angle function when Δt∈(λ, +∞)

Combined with Figure 10, when When , the change trajectory of the lens shake angle during the exposure process is the part within the width of the rectangle 1001, and the width of the rectangle 1001 is infinite, and the change trajectory of the lens shake angle during the exposure process may sweep through the maximum value many times. In this case The value of is 2A.

<2>, theoretical blur angle

The theoretical blur angle is the expected value of the blur angle when the shake compensation function is turned off, that is to say, the theoretical blur angle is the expected value of the blur angle corresponding to a certain exposure time assuming that there is no shake compensation function, which is obtained by calculation Predictive value.

<2.1> Theoretical fuzzy angle function

The embodiments of the present invention use the theoretical blur angle function to represent the relationship between the theoretical blur angle and the shaking amplitude, shaking period, exposure start time point, and exposure duration, that is, the theoretical blur angle function is a multivariate function about the above four physical quantities. The theoretical blur angle function is represented by ψ=g(t, Δt, A, λ), and ψ is the theoretical blur angle. After the camera equipment obtains the shaking parameters, the shaking amplitude A and the shaking cycle λ constant, that is to say, after the shaking parameters are determined, the theoretical blur angle is only related to the exposure start time point and the exposure duration, so the theoretical blur angle function can also be abbreviated as ψ =g(t,Δt).

According to the definition of the theoretical blur angle, the theoretical blur angle is the expected value of the blur angle, so the theoretical blur angle can be calculated according to the blur angle. Combined with <1.1.1>, the blur angle function is a periodic function with respect to t with a period of λ/2, and the expected value of the blur angle can be the average value of the blur angle in one cycle.

Of course, since the fuzzy angle function is a periodic function, its expected value in one cycle is equal to its expected value in multiple cycles. The embodiment of the present invention is described by taking the case of calculating the expected value in two periods as the theoretical blur angle as an example.

<2.1.1>, the specific form of theoretical fuzzy angle function

Optionally, the embodiment of the present invention provides two specific calculation methods, which are described as follows:

<2.1.1.1>, the first form of theoretical fuzzy angle function:

The theoretical fuzzy angle function is the quotient of the integral of the fuzzy angle function in the interval t∈[kλ, (k+1)λ] and the length λ of the integral interval, and k is an integer greater than or equal to 0. The length of the integral interval λ is twice the period λ/2 of the fuzzy angle function, so the theoretical fuzzy angle is the expected value of the fuzzy angle within two cycles.

Exposure time length Δt=Δt_i (i=1,...N), Δt_i is the exposure time length corresponding to the i-th exposure time length gear of the photographic equipment, referring to Table 1, the exposure time length corresponding to the exposure time length gear is known constant value.

The theoretical blur angles corresponding to each of the N exposure time length gears can be calculated by substituting the corresponding exposure time length Δt_i of each of the N exposure time length gears into the theoretical blur angle function ψ=g(t, Δt).

Specifically, the theoretical blur angles corresponding to each of the N exposure time gears are calculated by the first formula, and the first formula is:

Wherein, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, and k=0.

<2.1.1.2>, the second form of theoretical fuzzy angle function:

Wherein, t_j (j=1, . . . P) is the P sampling values of the exposure start time point t within one dithering period, and P is an integer greater than 1. The sampling interval is [kλ, (k+1)λ), k is an integer greater than or equal to 0,

The theoretical fuzzy angle function is the mean value of P sampling values of the fuzzy angle function in the interval [kλ, (k+1)λ). The length λ of the sampling interval is twice the period λ/2 of the fuzzy angle function, so the theoretical fuzzy angle is the expected value of the fuzzy angle within two cycles.

Exposure time length Δt=Δt_i (i=1,...N), the theoretical blur angle corresponding to each of N exposure time gears, the corresponding exposure time length Δt_i of N exposure time gears can be substituted into the theoretical blur angle function ψ= g(t, Δt) is calculated.

Specifically, the theoretical blur angles corresponding to each of the N exposure time gears are calculated by the second formula, and the second formula is:

<3>, theoretical fuzzy angle set

Combining the first formula in <2.1.1.1> and the second formula in <2.1.1.2>, among the N exposure time levels, each exposure time level corresponds to a theoretical blur angle. The set of theoretical blur angles includes, under the current jitter parameters (jitter amplitude A and jitter period λ), theoretical blur angles corresponding to each of the N exposure time length gears. Referring to Table 2, the set of theoretical blur angles includes ψ_i (i=1, . . . N).

Table II

Exposure time gear 1 2 3 4  … N Exposure time (Δt_i) Δt_1 Δt_2 Δt_3 Δt_4  … Δt_N Set of theoretical blur angles (ψ_i) ψ_1 ψ_2 ψ_3 ψ_4  … ψ_N

104. Determine a set of suppression ratios according to the currently acquired jitter parameters.

<3>Suppression ratio

The suppression ratio is used to indicate the ability of the camera to suppress the shake. Under a certain shake parameter, the stronger the ability of the camera to suppress the shake, the higher the clarity of the photo.

Optionally, in the embodiments of the present invention, the suppression ratio is represented by a function of a theoretical blur angle and a suppressed blur angle, where the suppressed blur angle is an expected value of the blur angle when the shake compensation function is turned on. Specifically, the function of the suppression ratio with respect to the theoretical ambiguity angle and the suppression ambiguity angle is specifically:

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. The suppression ratio is positively correlated with the theoretical blur angle and negatively correlated with the suppressed blur angle. The larger the suppression ratio, the stronger the camera equipment's ability to suppress shaking.

The suppression ratio reflects the anti-shake property of the photographic equipment, and can be calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle. The following describes the process of measuring and obtaining the experimental value of the theoretical blur angle and the experimental value of the suppressed blur angle

<3.1> Measure and obtain the experimental value of the theoretical blur angle ψ

The photographic equipment is fixed on the shaking table, and the shaking table provides certain shaking amplitude and shaking period. Theoretical blur angles ψ corresponding to different exposure durations are calculated and determined according to the shaking amplitude and shaking period. See step 103 for the calculation process, which will not be repeated here.

In addition, in conjunction with step 103, under the same shaking period, the size of the blur angle and the theoretical blur angle are directly proportional to the shaking amplitude. Expressed as follows:

g(t,Δt,A=X,λ)=Xg(t,Δt,A=1,λ)

f(t,Δt,A=X,λ)=Xf(t,Δt,A=1,λ)

Therefore, when performing step 103 to calculate the theoretical blur angle, the theoretical blur angle g(t, Δt, A=1, λ) when A=1 can be calculated first, and then the theoretical blur angle when A=X is Xg( t, Δt, A=1, λ). In addition, when measuring the theoretical blur angle experimentally, the shaking amplitude of the shaking table only needs to be set to 1°, and the theoretical blur angle when the shaking amplitude is other values can be calculated according to g(t, Δt, A=X, λ)= Xg(t, Δt, A=1, λ) is calculated. For example, when the jitter amplitude is 1°, the experimental value of the theoretical blur angle ψ is measured as shown in Table 3:

Table three

Combined with Table 3, when the dithering period is 1/8 second and the exposure time is 1/16 second, the experimental value of the corresponding theoretical blur angle is 1.41°. When the shaking amplitude is 2°, the shaking period is 1/8 second, and the exposure time is 1/16 second, the experimental value of the corresponding theoretical blur angle is 1.41° multiplied by 2. Subsequent content of this implementation is described by taking the case where the dithering amplitude is 1° as an example.

<3.2> Measure and obtain the experimental value of suppression blur angle ψ_ON

The blur suppression angle can be obtained by calculating the blur amount. The method of calculating the blur amount has been stipulated in the Camera & Imaging Products Association (English abbreviation: CIPA) standard, so I won’t go into details here. The process of calculating the blur angle based on the blur amount.

Referring to FIG. 11 , O is the object to be photographed, and the distance between the position of point O and the lens 1101 of the photographing device is the object distance, and the object distance is denoted by U.

The distance between the lens 1101 and the photosensitive element 1102 is the image distance, the image distance is denoted by V, and the focal length of the lens 1101 is denoted by F.

The blur distance is the length value of the blur range calculated according to the blur amount when the camera shake compensation function is turned on, and the blur distance is denoted by M. The amount of blur is usually represented by the number of pixels, and the blur distance is the product of the blur amount and the pixel diameter. It can be considered that the blur distance is the diameter of the range of the blur amount.

The included angle 1103 between the two end points of the diameter of the range of the blur amount and the line connecting the focal point of the lens 1101 is the suppression blur angle ψ_ON, and its size is:

According to the convex lens imaging formula:

The image distance V is replaced by the algebraic formula about the focal length F and the object distance U, and the final calculation formula of the suppression blur angle ψ_ON is obtained:

Under different jitter periods and jitter amplitudes, after obtaining the corresponding amount of blur, according to the final calculation formula of the suppressed blur angle ψ_ON, the experimental value of the suppressed blur angle ψ_ON is calculated. For example, when the jitter amplitude is 1°, the experimental value of the suppression blur angle ψ is measured as shown in Table 4:

Table four

Further, multiple sets of experimental values can be obtained through multiple measurements, and the final experimental value of the blur suppression angle ψ can be obtained by averaging the multiple sets of experimental values.

<3.3> Suppression Ratio List

The suppression ratio list includes the suppression ratios corresponding to each of the N exposure time long gears under different dithering parameters. The value of the suppression ratio in the suppression ratio list is calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the function of the suppression ratio on the theoretical blur angle and the suppression blur angle.

Substitute the experimental value of the theoretical blur angle in Table 3 and the experimental value of the suppressed blur angle in Table 4 into the function of the suppression ratio with respect to the theoretical blur angle and the suppressed blur angle Calculate the value of the suppression ratio when the jitter amplitude is 1°, and the data included in the suppression ratio list are shown in Table 5:

Table five

After obtaining the suppression ratio list, input the suppression ratio list into the camera device, and the camera device saves the suppression ratio list, so that the camera device can apply the suppression ratio list during the photographing process. The suppression ratio list may be input before the camera is shipped, or it may be input by software update after the camera is shipped.

It should be pointed out that the camera device can actually store the suppression ratio list in various forms, that is, the camera device can use various data structures to store the data in the suppression ratio list, not just in the form of a table. The embodiment of the present invention does not limit the specific data storage structure.

<3.4>, suppression ratio set.

As shown in Table 6, the set of suppression ratios includes the suppression ratios corresponding to each of the N exposure time levels under the currently acquired jitter parameters. DB_i (i=1, . . . N) in Table 6 represents N suppression ratios corresponding to N exposure time long gears.

Table six

Exposure time gear 1 2 3 4  … N Exposure time (Δt_i) Δt_1 Δt_2 Δt_3 Δt_4  … Δt_N Suppression Ratio Set (DB_i) DB_1 DB_2 DB_3 DB_4  … DB_N

The specific value of DB_i can be obtained by querying the suppression ratio list according to the jitter parameter. For example, during the photographing process, the photographing device determines that the current shaking amplitude is 1° and the shaking period is 1/8 second after acquiring the shaking parameters. Combined with Table 5, the photographic equipment queries the suppression ratio list, and determines that the suppression ratio corresponding to the exposure time range of 1/16 second is 18.7, and the suppression ratio corresponding to the exposure time range of 1/32 second is 15.89.

There is no sequence between step 104 and step 103 . That is, after the camera device obtains the shaking parameters, it may first predict the set of theoretical blur angles and then determine the set of suppression ratios, or determine the set of suppression ratios first and then predict the set of theoretical blur angles, or both steps may be performed simultaneously.

105. Predicting and suppressing a set of fuzzy angles.

As shown in Table 7, the set of suppressed blur angles includes the suppressed blur angles corresponding to each of the N exposure time levels under the currently obtained shake parameters. ψ_ON_i (i=1, . . . N) in Table 7 represents N blur suppression angles corresponding to N exposure time long gears.

Table Seven

Combined with <3.2>, in the experimental testing stage, the experimental value of the blur angle ψ_ON is the measured value obtained from the experiment. Here, the specific value of the suppression fuzzy angle ψ_ON_i (i=1,...N) in the suppression fuzzy angle set is based on the theoretical fuzzy angle set and the suppression ratio set, according to the function of the theoretical fuzzy angle and the suppression fuzzy angle according to the suppression ratio , to calculate the resulting predicted value.

Combined with the set of theoretical blur angles shown in Table 2 and the set of suppression ratios shown in Table 6, according to the function of the suppression ratio on the theoretical blur angle and the suppression blur angle: ψ_ON_i can be inversely obtained through the above functional relationship according to ψ_i and DB_i.

That is to say, in the experimental stage, under a certain jitter parameter, according to the experimental value of the theoretical blur angle ψ obtained by actual measurement, and the experimental value of the suppression blur angle ψ_ON, according to Forward calculation determines the suppression ratio DB, and finally obtains the suppression ratio list. It is briefly expressed as (ψ, ψ_ON)==>DB.

In the actual photographing process, after the shake parameters are obtained, the theoretical blur angle set ψ_i is predicted according to the currently obtained shake parameters, the suppression ratio set DB_i is determined according to the currently obtained shake parameters, and then according to Reverse deduction to get ψ_ON_i. It is briefly expressed as (ψ, DB)==>ψ_ON.

106. Obtain the allowable blur angle ψ_max

The allowable blur angle ψ_max is used to indicate an acceptable maximum suppressed blur angle, and may be a preset value, or a value actually calculated by the photographing device during the photographing process. Here is a description of the specific calculation process of the allowable blur angle ψ_max:

<4>, calculation of allowable blur angle ψ_max

The angle between two object points that can be distinguished by the human eye is called the minimum resolvable angle α of the human eye. Referring to FIG. 12 , when the viewing distance is s, the angle 1201 between the line connecting the object point W1 and the object point W2 to the eyeball is the minimum resolvable angle α of the human eye. The minimum resolvable angle α of the human eye depends on the structure of the human eye itself. In the embodiment of the present invention, the minimum resolvable angle α of the human eye is a preset value, usually 1/60°.

According to the minimum resolvable angle α of the human eye, the diameter a of the minimum blur range that the human eye can perceive when observing a picture can be calculated at a certain viewing distance. Specifically, as shown in Figure 13, when the viewing distance is s, there are:

The viewing distance may be a preset value, or may be manually selected by the user. For example, if the camera device is specifically a mobile phone, the preset viewing distance may be 30 centimeters. Or provide users with several viewing distance gears, which can be selected by the user.

Combining with the blur distance M on the photosensitive element 1102 shown in FIG. 11 , the diameter a of the blur range that the human eye can perceive in the photo corresponds to the maximum allowable blur distance b on the photosensitive element 1102 . Use d to represent the length of the long side of the photosensitive element, and c to represent the length of the long side of the photo, then get:

When the allowable maximum blur distance b is determined, the allowable blur angle can be obtained by further calculation. When the imaging position of the object O on the photosensitive element 1102 is different, the calculation method of the allowable blur angle ψ_max is different, and the following description will be given for different imaging positions.

<4.1>, the calculation of ψ_max when the imaging is at the center of the photosensitive element

As shown in FIG. 14, when the imaging position of the object O on the photosensitive element 1102 is at the center of the photosensitive element 1102, there are:

According to Equation 1, Equation 2, and Equation 3.1, we get:

Further, according to get:

<4.2>, the calculation of ψ_max when imaging at the edge of the photosensitive element

As shown in FIG. 15, when the imaging position of the object O on the photosensitive element 1102 is at the edge of the photosensitive element 1102, there are:

According to Equation 1, Equation 2, and Equation 3.2, we get:

Further, according to get:

<4.3>, the calculation of ψ_max when imaging at other positions of the photosensitive element

When the imaging position of the object O on the photosensitive element 1102 is between the center position and the edge position of the photosensitive element 1102, the calculation method is similar to the calculation method described in <4.2> when the image is at the edge position, and will not be repeated here. .

In the photos actually taken by the camera equipment, the measured blur suppression angle is greater than the allowable blur angle ψ_max, which means that the user can observe (partial) blur in the photos with naked eyes. If the measured blur suppression angle is not greater than the allowable blur angle ψ_max, it means that the sharpness of the photo is within the acceptable range when observed by human eyes.

107. Determine the target suppression blur angle ψ_opt.

The target suppression blur angle ψ_opt is a suppression blur angle selected from the suppression blur angle set ψ_ON_i (i=1, . . . N) according to the allowable blur angle ψ_max.

As shown in FIG. 16 , under a certain jitter parameter, the experimental value of the blur suppression angle ψ_ON varies with the exposure time Δt. In FIG. 16 , Δt_a to Δt_i increase sequentially. When the exposure time Δt increases, the blur suppression angle ψ_ON first decreases and then increases, and the change trend is U-shaped.

The target suppression blur angle ψ_opt is smaller than or close to the allowable blur angle ψ_max. Two specific ways of determining the target suppression blur angle ψ_opt are introduced below.

<5.1>, a way to determine the target suppression blur angle ψ_opt

In the set of suppressed blur angles ψ_ON_i (i=1,...N), when at least one of the suppressed blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle ψ_max, it is never greater than the allowable blur angle ψ_max Choose one of the suppressed blur angles as the target suppressed blur angle ψ_opt.

As shown in Figure 17, in the suppression blur angle set ψ_ON_i (i=1,...N), the suppression blur angles ψ_ON corresponding to Δt_c to Δt_g are not greater than the allowable blur angle ψ_max, in this case, Δt_c to Δt_g where The blur suppression angle ψ_ON corresponding to any exposure duration can be used as the target blur suppression angle ψ_opt.

Preferably, considering the influence of the exposure amount on the photo quality, the exposure time should be extended as much as possible to increase the exposure amount under the premise of ensuring the clarity of the photo. In the set of blur suppression angles ψ_ON_i (i=1,...N), when at least one of the corresponding blur suppression angles of the N exposure time long gears is not greater than the allowable blur angle, the blur suppression that is never larger than the allowable blur angle Among the angles, the blur suppression angle ψ_ON corresponding to the longest exposure time is selected as the target blur suppression angle.

As indicated by the arrow in FIG. 17 , the exposure duration corresponding to Δt_g among Δt_c to Δt_g is the largest. In this case, the corresponding blur suppression angle ψ_ON corresponding to Δt_g is selected as the target blur suppression angle.

<5.2> Another way to determine the target suppression blur angle ψ_opt

In the blur suppression angle set ψ_ON_i (i=1,...N), when the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle ψ_max, the blur suppression corresponding to each of the N exposure time long gears Select the smallest suppression blur angle among the angles as the target suppression blur angle ψ_opt.

As shown in FIG. 18 , the suppressed blur angles corresponding to Δt_a to Δt_i are all larger than the allowable blur angle ψ_max, and the suppressed blur angles corresponding to Δt_d are the smallest, that is, the closest to the allowable blur angle ψ_max. In this case, the corresponding suppression blur angle ψ_ON corresponding to Δt_d is selected as the target suppression blur angle ψ_opt.

108. Set the target exposure time gear.

The target exposure time gear is the exposure time gear corresponding to the target blur suppression angle ψ_opt.

As shown in FIG. 17 , the target blur suppression angle ψ_opt is the corresponding suppression blur angle ψ_ON corresponding to Δt_g, then the target exposure time scale is the exposure time scale corresponding to Δt_g.

As shown in FIG. 18 , the target blur suppression angle ψ_opt is the corresponding suppression blur angle ψ_ON corresponding to Δt_d, then the target exposure time scale is the exposure time scale corresponding to Δt_d.

109. Determine an exposure start time point, and start an exposure process at the determined exposure time point.

After step 108, the exposure duration gear setting is completed. Step 109 is a subsequent step after the exposure time gear is set, and is a step of completing the photographing process by applying the set exposure time gear.

Combining <1.1> with the fuzzy angle function Explanation of , when the exposure time Δt, the shaking amplitude A and the shaking period λ are determined, when the blur angle function The value of may be different, so a reasonable selection of the exposure start time point t will help reduce the blur angle and obtain a high-definition photo.

Also, combining <1.1.1> to <1.1.2>, the blur angle function is a periodic function with respect to t with a period of λ/2, and has minimum and maximum values in a period.

As shown in Figure 19, at time t0, the photographic device obtains the shake amplitude A and shake period λ according to the actual shake situation, and determines the blur angle function

At time t1, the camera equipment sets the exposure time Δt, where Δt_0 represents the exposure time corresponding to the target exposure time gear, ie Δt=Δt_0. That is to say, at the time t1, the values of the shaking amplitude A, the shaking period λ, and the exposure duration Δt are all known, and it is only necessary to further determine the exposure start time point t.

Camera equipment according to blur angle function As well as the determined values of Δt, A and λ, determine the fuzzy angle function There is a minimum at t=t_0+k(λ/2), where t_0 is greater than t1. That is, the blur angle function There is a minimum value at (t=t_0, Δt=Δt_0, A, λ), so the photographic equipment can start the exposure process at the moment t=t_0+k(λ/2), and expose according to the set exposure time and long gear, and obtain Best shot.

Values of <6>, t0, t1 and t_0

<6.1>, the value of t0

The value of t0 depends on the time when the camera equipment obtains the shake parameters.

For example, the camera starts to sample the dithering parameters at time 0 (the origin position in FIG. 19 ), and processes the sampled signal, including Fourier transform bandpass filtering and the like. The value of t0 is the sum of the time delay caused by signal transmission and signal processing, taking the start time point of sampling the jitter parameter as the start time point.

<6.2>, the value of t1

The value of t1 depends on the exposure time set by the photographic equipment.

For example, after the camera device obtains the shake parameters, it performs a series of calculations based on the shake parameters to determine the target blur suppression angle ψ_opt, and finally sets the time required for the target exposure time long gear, and adds t0 to obtain the value of t1.

Of course, the camera device may also need to do other signal processing or data calculation to complete other functions, and the value of t1 can be determined only by summing up these time costs.

<6.3>, the value of t_0

The value of t_0 depends on the blur angle function the nature of itself.

blur angle function It passes through its minimum point every cycle. After the camera equipment has set the target exposure time gear, as long as the blur angle function The point at which the minimum value is reached can be used as the t_0 time point. Preferably, after setting the target exposure time gear, the blur angle function The time point when the minimum value is reached for the first time is taken as the t_0 time point.

In the method for setting the exposure time provided by the embodiments of the present invention, the theoretical blur angle set is obtained according to the jitter parameter prediction, and then the suppression blur angle set is obtained according to the suppression ratio set prediction, and selected from the suppression blur angle set according to the allowable blur angle The target suppression blur angle, set the exposure time as the exposure time corresponding to the target suppression blur angle, so as to set the most appropriate exposure time gear according to the actual shaking of the camera equipment during the shooting process, so as to improve the clarity of the photo. Further, the exposure start time point is selected so that the actual blur angle is as close as possible to the minimum value of the blur angle function, thereby further improving the sharpness of the photo.

It should be noted that, for the method embodiment corresponding to Fig. 1, for the sake of simple description, it is expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. limitations because certain steps may be performed in other orders or simultaneously in accordance with the invention.

In addition, those skilled in the art should also know that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily necessary for the present invention. The trigger acquisition can also be when a certain trigger condition set by the software is met, and the photographing process is started. The photographing process described in this embodiment should be regarded as an example rather than exhaustive.

Based on the method for setting the exposure time provided by the embodiment of the present invention, the embodiment of the present invention also provides a device for setting the exposure time, which is used for setting the target exposure time gear of the photographic equipment. The device for setting the exposure time can be installed in the photographic equipment, or can also be connected with the photographic equipment through a communication line or a communication network. The photographic device provides N exposure time gears, one exposure time gear corresponds to one exposure time, where N is an integer greater than 1.

Referring to Figure 20, the device 20 for setting the exposure time includes:

The acquisition unit 201 is configured to acquire a shake parameter, which is used to indicate the shake state of the photographing device during the photographing process.

The processing unit 202 is configured to predict a set of theoretical blur angles according to the shaking parameters currently acquired by the acquiring unit 201 . The theoretical blur angle set includes the theoretical blur angle corresponding to each of the N exposure time gears. The theoretical blur angle is the expected value of the blur angle when the shake compensation function is turned off. The blur angle is the cumulative change of the lens shake angle during the exposure process. .

The processing unit 202 is further configured to determine a set of suppression ratios according to the jitter parameters currently acquired by the acquiring unit 201 . The suppression ratio set includes the suppression ratios corresponding to each of the N exposure time gears under the currently obtained shake parameters. The suppression ratio is a function of the theoretical blur angle and the suppressed blur angle. The suppressed blur angle is when the shake compensation function is turned on. The expected value of the blur angle.

The processing unit 202 is further configured to predict the set of suppression blur angles according to the set of theoretical blur angles and the set of suppression ratios, according to the function of the suppression ratio with respect to the theoretical blur angle and the suppression blur angle. The set of suppressed blur angles includes the suppressed blur angles corresponding to each of the N exposure time length gears under the currently acquired jitter parameters.

The acquiring unit 201 is further configured to acquire an allowable blur angle.

The processing unit 202 is further configured to select one of the suppressed blur angles from the set of suppressed blur angles as the target suppressed blur angle according to the allowable blur angle obtained by the obtaining unit 201 . Allowable Blur Angle is used to indicate the maximum acceptable suppressed blur angle.

The setting unit 203 is further configured to set the target exposure time gear according to the target blur suppression angle determined by the processing unit 202, and the target exposure time gear is the exposure time gear corresponding to the target blur suppression angle.

Optionally, the acquiring unit 201 is also configured to acquire a suppression ratio list. The suppression ratio list includes the suppression ratios corresponding to each of the N exposure time long gears under different dithering parameters. The value of the suppression ratio in the suppression ratio list is calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the function of the suppression ratio on the theoretical blur angle and the suppression blur angle.

The processing unit 202 is further configured to query the suppression ratio list acquired by the acquisition unit 201 according to the shaking parameters, determine the suppression ratios corresponding to each of the N exposure time length gears under the currently obtained shaking parameters, and obtain a suppression ratio set.

For example, in a specific implementation manner, the device 20 that suppresses the set exposure time longer than the list is input and saved before leaving the factory, or may also be input and saved through software update after leaving the factory. During the photographing process, the processing unit 202 obtains a set of suppression ratios by querying the stored suppression ratio list.

It should be pointed out that the device 20 for setting the exposure time length can actually store the suppression ratio list in various forms, that is, the device 20 for setting the exposure time length can use various data structures to store the data in the suppression ratio list, not just Stored in the form of a table. The embodiment of the present invention does not limit the specific data storage structure.

Optionally, the acquiring unit 201 is specifically configured to acquire the shaking amplitude and shaking period of the photographing device during the photographing process.

Optionally, the processing unit 202 is specifically configured to construct a blur angle function according to the jitter amplitude and the jitter period

in, is the blur angle, t is the exposure start time point, Δt is the exposure time, A is the shaking amplitude, and λ is the shaking period. According to the blur angle function, the theoretical blur angles corresponding to each of the N exposure time length gears are calculated to obtain a set of theoretical blur angles.

Optionally, the processing unit 202 is further configured to calculate theoretical blur angles corresponding to each of the N exposure time length gears according to the first formula, and the first formula is:

Wherein, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, i=1,...N, Δt_i is the exposure time corresponding to the i-th exposure time gear, and λ is the jitter cycle.

Alternatively, the processing unit 202 is further configured to calculate theoretical blur angles corresponding to each of the N exposure time length gears according to a second formula, and the second formula is:

Wherein, t_j (j=1, . . . P) is P sampling values of the exposure start time point t within one dithering period, k is an integer greater than or equal to 0, and P is an integer greater than 1.

Optionally, the processing unit 202 is specifically configured to select a suppressed blur angle that is smaller than or close to the allowable blur angle from the set of suppressed blur angles as the target suppressed blur angle.

Optionally, when at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processing unit 202 is further configured to select the corresponding exposure duration from the suppression blur angles not greater than the allowable blur angle The longest suppression blur angle is the target suppression blur angle.

When the suppression blur angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processing unit 202 is further configured to select the smallest suppression blur angle from the respective suppression blur angles corresponding to the N exposure time long gears as the target suppression Blurred corners.

Optionally, the processing unit 202 is specifically configured to predict and suppress a blur angle set according to the following function of the blur angle:

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle.

Optionally, the acquiring unit 201 is also configured to acquire a user's photographing instruction.

The processing unit 202 is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t. blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear.

Those skilled in the art should understand that the device for setting the exposure time described in the embodiments of the present invention can be in the form of a complete hardware embodiment, a complete software embodiment, or a combination of software and hardware. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, semiconductor storage, optical storage, etc.) having computer-usable program code embodied therein. The computer program is stored/distributed on suitable media, provided with or as part of other hardware, and may also take other forms of distribution, such as via the Internet or other wired or wireless telecommunication systems.

The device for setting the exposure time provided by the embodiment of the present invention obtains the theoretical blur angle set according to the prediction of the shaking parameters, and then obtains the suppression blur angle set according to the prediction of the suppression ratio set, and selects from the suppression blur angle set according to the allowable blur angle. The target suppression blur angle, set the exposure time as the exposure time corresponding to the target suppression blur angle, so as to set the most appropriate exposure time gear according to the actual shaking of the camera equipment during the shooting process, so as to improve the clarity of the photo. Further, the exposure start time point is selected so that the actual blur angle is as close as possible to the minimum value of the blur angle function, thereby further improving the sharpness of the photo.

Based on the method for setting the exposure time provided by the embodiment of the present invention, the embodiment of the present invention also provides another device for setting the exposure time, which is used for setting the target exposure time gear of the photographic equipment. The device for setting the exposure time can be installed in the photographic equipment, or can also be connected with the photographic equipment through a communication line or a communication network. The photographic device provides N exposure time gears, one exposure time gear corresponds to one exposure time, where N is an integer greater than 1.

Referring to FIG. 21 , the device 21 for setting the exposure time includes: a processor 211 , a memory 212 , a bus 213 and a receiver 214 . The processor 211 , the memory 212 and the receiver 214 are connected to each other through the bus 213 .

The bus 213 can be an industry standard architecture (English full name: Industry Standard Architecture, English abbreviation: ISA) bus 213, a peripheral device interconnection (English full name: Peripheral Component Interconnect, English abbreviation: PCI) or an extended industry standard architecture (English full name: Extended Industry Standard Architecture, English abbreviation: EISA) bus 213, etc. The bus 213 can be divided into an address bus 213, a data bus 213, a control bus 213 and so on. For ease of representation, only one thick line is used in FIG. 21 , but this does not mean that there is only one bus 213 or one type of bus 213 .

Program codes for implementing the solutions of the present invention are stored in the memory 212 and executed under the control of the processor 211 .

The memory 212 may include a volatile memory (English full name: volatile memory), for example, a random access memory (English full name: random-access memory, English abbreviation: RAM). The memory 212 may also include a non-volatile memory (English full name: non-volatile memory), for example, a read-only memory (English full name: read-only memory, English abbreviation: ROM), including an electrically erasable programmable read-only memory (English Full name: Electrically Erasable Programmable Read-Only Memory, English abbreviation: EEPROM), etc.

In addition, the non-volatile memory can also be a flash memory (English full name: flash memory), a hard disk (English full name: hard disk drive, English abbreviation: HDD) or a solid state drive (English full name: solid-state drive, English abbreviation: SSD). )Wait. Of course, the storage 212 may also include a combination of the above-mentioned types of storage.

The processor 211 may be a central processing unit 211 (full name: Central Processing Unit, CPU for short), or a combination of a CPU and a hardware chip. The aforementioned hardware chip may be an application-specific integrated circuit (full English name: application-specific integrated circuit, English abbreviation: ASIC), a programmable logic device (English full name: programmable logic device, English abbreviation: PLD), or any combination thereof.

Further, the above-mentioned PLD can be a complex programmable logic device (English full name: complexprogrammable logic device, English abbreviation: CPLD), field programmable logic gate array (English full name: field-programmable gate array, English abbreviation: FPGA), a general-purpose array Logic (English full name: generic arraylogic, English abbreviation: GAL) or any combination thereof.

In a possible implementation manner, when the above program is executed by the processor 211, the following functions are realized:

The receiver 214 is configured to acquire a shake parameter, and the shake parameter is used to indicate the shake state of the photographing device during the photographing process.

The processor 211 is configured to predict a set of theoretical blur angles according to the shake parameters currently acquired by the receiver 214 . The theoretical blur angle set includes the theoretical blur angle corresponding to each of the N exposure time gears. The theoretical blur angle is the expected value of the blur angle when the shake compensation function is turned off. The blur angle is the cumulative change of the lens shake angle during the exposure process. .

The processor 211 is further configured to determine a suppression ratio set according to the jitter parameters currently acquired by the receiver 214 . The suppression ratio set includes the suppression ratios corresponding to each of the N exposure time gears under the currently obtained shake parameters. The suppression ratio is a function of the theoretical blur angle and the suppressed blur angle. The suppressed blur angle is when the shake compensation function is turned on. The expected value of the blur angle.

The processor 211 is further configured to predict the set of suppression blur angles according to the set of theoretical blur angles and the set of suppression ratios, according to the function of the suppression ratio with respect to the theoretical blur angle and the suppression blur angle. The set of suppressed blur angles includes the suppressed blur angles corresponding to each of the N exposure time length gears under the currently acquired jitter parameters.

The receiver 214 is also used to obtain the allowable blur angle.

The processor 211 is further configured to select one of the suppressed blur angles from the set of suppressed blur angles as the target suppressed blur angle according to the allowable blur angle acquired by the receiver 214 . Allowable Blur Angle is used to indicate the maximum acceptable suppressed blur angle.

The processor 211 is further configured to set a target exposure time gear according to the target blur suppression angle, where the target exposure time gear is the exposure time gear corresponding to the target blur suppression angle.

Optionally, the receiver 214 is also configured to acquire a suppression ratio list. The suppression ratio list includes the suppression ratios corresponding to each of the N exposure time long gears under different dithering parameters. The value of the suppression ratio in the suppression ratio list is calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the function of the suppression ratio on the theoretical blur angle and the suppression blur angle.

The processor 211 is further configured to query the suppression ratio list obtained by the receiver 214 according to the jitter parameters, determine the suppression ratios corresponding to each of the N exposure time length gears under the currently obtained jitter parameters, and obtain a suppression ratio set.

For example, in a specific implementation manner, the device 21 that suppresses the set exposure time longer than the list is input and stored in the memory 212 before leaving the factory, or it can also be input and stored in the memory 212 by means of software update after leaving the factory. middle. During the photographing process, the processor 211 reads the suppression ratio list from the memory 212, and obtains a suppression ratio set by querying the suppression ratio list.

It should be pointed out that the memory 212 may actually store the suppression ratio list in various forms, that is, the memory 212 may use various data structures to store the data in the suppression ratio list, not just in the form of a table. The embodiment of the present invention does not limit the specific data storage structure.

Optionally, the receiving unit is specifically configured to acquire the shaking amplitude and shaking period of the photographing device during the photographing process.

Optionally, the processor 211 is specifically configured to construct a fuzzy angle function according to the jitter amplitude and the jitter period in, is the blur angle, t is the exposure start time point, Δt is the exposure time, A is the shaking amplitude, and λ is the shaking period. According to the blur angle function, the theoretical blur angles corresponding to each of the N exposure time length gears are calculated to obtain a set of theoretical blur angles.

Optionally, the processor 211 is further configured to calculate theoretical blur angles corresponding to each of the N exposure time length gears according to the first formula, and the first formula is:

Wherein, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, i=1,...N, Δt_i is the exposure time corresponding to the i-th exposure time gear, and λ is the jitter cycle.

Alternatively, the processor 211 is further configured to calculate the theoretical blur angles corresponding to each of the N exposure time length gears according to the second formula, and the second formula is:

Wherein, t_j (j=1, . . . P) is P sampling values of the exposure start time point t within one dithering period, k is an integer greater than or equal to 0, and P is an integer greater than 1.

Optionally, the processor 211 is specifically configured to select a suppressed blur angle that is smaller than or close to the allowable blur angle from the set of suppressed blur angles as the target suppressed blur angle.

Optionally, when at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processor 211 is further configured to select the corresponding exposure duration from the suppression blur angles not greater than the allowable blur angle The longest suppression blur angle is the target suppression blur angle.

When the suppression blur angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processor 211 is further configured to select the smallest suppression blur angle from the respective suppression blur angles corresponding to the N exposure time long gears as the target suppression blurred corners.

Optionally, the processor 211 is specifically configured to predict the suppression blur angle set according to the following function of the blur angle.

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle.

Optionally, the receiver 214 is also used to acquire a user's instruction to take pictures.

The processor 211 is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t. blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear.

Based on the apparatus for setting the exposure time provided by the embodiment of the present invention, the embodiment of the present invention also provides a photographic device for implementing the method for setting the exposure time described in the embodiment of the present invention.

The photographic device may specifically be a digital camera, a smart phone with a photographic function, a tablet computer, an unmanned aerial vehicle, and the like.

The photographic device provides N exposure time gears, one exposure time gear corresponds to one exposure time, where N is an integer greater than 1. By implementing the method for setting the exposure time provided by the embodiment of the present invention, one of the N exposure time gears is selected during the photographing process, and the exposure process is completed according to the exposure time corresponding to the selected gear.

In a specific application scenario, the photographic equipment includes the device for setting the exposure time described in the embodiment corresponding to FIG. 20 .

Alternatively, the camera equipment includes the device for setting the exposure time described in the embodiment corresponding to FIG. 21 .

The device for setting the exposure time and the photographic equipment provided by the embodiments of the present invention obtain the set of theoretical blur angles according to the prediction of the shake parameters, and then obtain the set of suppressed blur angles according to the set of suppression ratios, and obtain the set of suppressed blur angles according to the allowable blur angles. Select the target blur suppression angle, and set the exposure time as the exposure time corresponding to the target blur suppression angle, so as to set the most appropriate exposure time gear according to the actual shaking of the camera equipment during the shooting process, thereby improving the image quality. clarity. Further, the exposure start time point is selected so that the actual blur angle is as close as possible to the minimum value of the blur angle function, thereby further improving the sharpness of the photo.

Based on the method for setting the exposure duration and the photographic device provided by the embodiments of the present invention, the embodiments of the present invention further provide a computer-readable storage medium. The computer-readable storage medium stores program codes, and when the program codes are executed, the method for setting the exposure duration described in the embodiments of the present invention is realized.

For example, in a specific implementation manner, when the method for setting the exposure duration provided by the embodiments of the present invention is implemented by software, or by combining software and hardware, the method for setting the exposure duration can be realized The program code is stored in a computer readable storage medium. Of course, the above program code can also be transmitted and stored as one or more instructions and codes on a computer-readable storage medium.

Computer readable storage media may include computer storage media and communication media.

A storage media may be any available media that can be accessed by a computer. Including but not limited to: random access memory (English full name: Random Access Memory, English abbreviation: RAM), read-only memory (English full name: Read OnlyMemory, English abbreviation: ROM), electrically erasable programmable read-only memory (English full name: Electrically Erasable Programmable Read Only Memory, English abbreviation: EEPROM), CD-ROM (English abbreviation: Compact DiscRead Only Memory, English abbreviation: CD-ROM) or other optical disc storage, magnetic disk storage medium or other magnetic storage devices, or can be used for portable, Any other medium that stores desired program code in the form of instructions or data structures and that can be accessed by a computer.

Communication media includes any medium that facilitates transfer of a computer program from one place to another. The various connections used for transferring data may suitably be computer-readable storage media.

For example, if the software is downloaded from a website, server or Transmission by other remote sources, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, wireless and microwave are also included in the definition of computer-readable storage medium referred to in the embodiments of the present invention middle.

In an application scenario, the photographing device is specifically a smart phone. The method for setting the exposure duration provided by the embodiments of the present invention is stored in the server in the form of an application program (English full name: Application, English abbreviation: APP) installation package, and the smart phone downloads and installs the application program installation package by accessing the server , implementing the method for setting the exposure duration provided by the embodiment of the present invention.

In the above application scenarios, the storage medium used by the server to store the application installation package, the transmission medium for transmitting the application installation package between the smartphone and the server, and the storage medium for storing and running the application installation package on the smartphone itself are all included in the In the definition of the computer-readable storage medium referred to in the embodiments of the present invention. As far as smartphones are concerned, computer-readable storage media include Secure Digital Card (English full name: Secure Digital Card, English abbreviation: SD) card, eMMC (English full name: Embedded Multi Media Card, English abbreviation: Embedded Multi Media Card), RAM and so on.

The computer-readable storage medium for setting the exposure time provided by the embodiments of the present invention stores and transmits program codes or instructions for implementing the method for setting the exposure time. When the program code or instruction is run or invoked, the theoretical blur angle set is obtained according to the prediction of the jitter parameters, and then the suppression blur angle set is obtained according to the prediction of the suppression ratio set, and the target suppression blur angle is selected from the suppression blur angle set according to the allowable blur angle , set the exposure time as the exposure time corresponding to the target blur suppression angle, so as to set the most appropriate exposure time gear according to the actual shaking of the camera equipment during the shooting process, thereby improving the clarity of the photo. Further, the exposure start time point is selected so that the actual blur angle is as close as possible to the minimum value of the blur angle function, thereby further improving the sharpness of the photo.

It should be noted that although the present invention has been described in conjunction with various embodiments herein, however, in the process of implementing the claimed invention, those skilled in the art will other variations of the disclosed embodiments can be understood and effected by reading this book. In the claims, the word "comprising" does not exclude other elements or steps. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that these measures cannot be combined to advantage.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, devices (devices), or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein. The computer program is stored/distributed on suitable media, provided with or as part of other hardware, and may also take other forms of distribution, such as via the Internet or other wired or wireless telecommunication systems.

The present invention is described with reference to flowcharts and/or block diagrams of methods, apparatus (device) and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and a combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so that The instructions provide steps for implementing the functions specified in the flowchart or procedures and/or the block or blocks in the block diagrams.

Although the invention has been described in conjunction with specific features and examples thereof, it will be apparent that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are merely illustrative of the invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (43)

1. A method for setting the exposure time, which is used to set the target exposure time gear of the photographic equipment, and the photographic equipment provides N exposure time gears, and one exposure time gear corresponds to one exposure time, wherein N is greater than Integer of 1, it is characterized in that, described method comprises: Obtaining a shaking parameter, the shaking parameter is used to indicate the shaking state of the photographing device during the photographing process; Predict a set of theoretical blur angles according to the currently acquired shake parameters; the set of theoretical blur angles includes the theoretical blur angles corresponding to the N exposure time gears, and the theoretical blur angle is the expected value of the blur angle when the shake compensation function is turned off. , the blur angle is the cumulative change of the lens shake angle during the exposure process; Determine the set of suppression ratios according to the currently acquired jitter parameters; the set of suppression ratios includes the suppression ratios corresponding to each of the N exposure time length gears under the currently acquired jitter parameters, and the suppression ratios are about the theoretical blur angle and the suppression blur angle The function of , the suppression blur angle is the expected value of the blur angle when the shake compensation function is turned on; According to the set of theoretical blur angles and the set of suppression ratios, predict the set of suppression blur angles according to the function of the suppression ratio on the theoretical blur angle and the suppressed blur angle; the set of suppressed blur angles is included under the currently acquired jitter parameters, The blur suppression angles corresponding to each of the N exposure time gears; Obtain an allowable blur angle, and select one of the suppressed blur angles from the set of suppressed blur angles as a target suppressed blur angle according to the allowable blur angle; the allowable blur angle is used to indicate an acceptable maximum suppressed blur angle; A target exposure time gear is set, and the target exposure time gear is an exposure time gear corresponding to the target blur suppression angle. 2. The method of claim 1, wherein, Before the determination of the suppression ratio set according to the currently acquired jitter parameters, the method further includes: obtaining a suppression ratio list; the suppression ratio list includes the suppression ratios corresponding to the N exposure time gears under different jitter parameters The value of the suppression ratio in the suppression ratio list is calculated according to the function of the suppression ratio on the theoretical fuzzy angle and the suppressed fuzzy angle, based on the experimental value of the theoretical fuzzy angle and the experimental value of the suppressed fuzzy angle; The determining the suppression ratio set according to the currently acquired jitter parameters includes: Query the list of suppression ratios according to the shake parameters, determine the suppression ratios corresponding to the N exposure time length gears under the currently acquired shake parameters, and obtain the set of suppression ratios. 3. The method according to claim 1 or 2, characterized in that the acquiring the shaking parameters comprises: acquiring the shaking amplitude and shaking period of the photographing device during the photographing process. 4. The method according to claim 3, wherein predicting the theoretical blur angles corresponding to each of the N exposure duration gears according to the jitter parameters includes: Construct blur angle function from dither amplitude and dither period in, is the blur angle, t is the exposure start time point, Δt is the exposure duration, A is the shaking amplitude, and λ is the shaking period; Theoretical blur angles corresponding to the N exposure time length gears are calculated according to the blur angle function to obtain the set of theoretical blur angles. 5. The method according to claim 4, wherein the calculation of the corresponding theoretical blur angles of the N exposure duration gears according to the blur angle function comprises: The theoretical blur angles corresponding to each of the N exposure time gears are calculated according to the first formula, and the first formula is: Among them, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, i=1,...N, Δt_i is the exposure time corresponding to the i-th exposure time gear, and λ is the jitter cycle; Alternatively, the theoretical blur angles corresponding to each of the N exposure time levels are calculated according to the second formula, and the second formula is: Wherein, t_j (j=1, . . . P) is P sampling values of the exposure start time point t within one dithering period, and P is an integer greater than 1. 6. The method according to any one of claims 1-2, 4-5, characterized in that, according to the allowable blur angle, one of the suppression blur angles is selected from the set of suppression blur angles as the target suppression blur angle angle, including: A suppressed blur angle smaller than or close to the allowable blur angle is selected from the set of suppressed blur angles as a target suppressed blur angle. 7. The method according to claim 3, wherein the selecting one of the suppressed blur angles from the set of suppressed blur angles as the target suppressed blur angle according to the allowable blur angles comprises: A suppressed blur angle smaller than or close to the allowable blur angle is selected from the set of suppressed blur angles as a target suppressed blur angle. 8. The method according to claim 6, wherein selecting the suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as the target suppressed blur angle includes: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, select the one with the longest corresponding exposure time from the suppression blur angles that are not greater than the allowable blur angle. The blur angle is the target suppression blur angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, select the minimum blur suppression angle as the target blur suppression angle from the respective blur suppression angles corresponding to the N long exposure time gears horn. 9. The method according to claim 7, wherein selecting the suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as the target suppressed blur angle includes: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, select the one with the longest corresponding exposure time from the suppression blur angles that are not greater than the allowable blur angle. The blur angle is the target suppression blur angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, select the minimum blur suppression angle as the target blur suppression angle from the respective blur suppression angles corresponding to the N long exposure time gears horn. 10. The method according to any one of claims 1-2, 4-5, 7-9, characterized in that, The function of the suppression ratio with respect to the theoretical ambiguity angle and the suppression ambiguity angle is specifically: Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 11. The method of claim 3, wherein, The function of the suppression ratio with respect to the theoretical ambiguity angle and the suppression ambiguity angle is specifically: Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 12. The method of claim 6, wherein, The function of the suppression ratio with respect to the theoretical ambiguity angle and the suppression ambiguity angle is specifically: Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 13. The method according to any one of claims 4-5, 7-9, characterized in that, The method also includes: acquiring a user's photographing instruction; After the target exposure time gear is set, the method further includes: according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 14. The method of claim 6, wherein, The method also includes: acquiring a user's photographing instruction; After the target exposure time gear is set, the method further includes: according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 15. A device for setting the exposure time, which is used to set the target exposure time gear of the photographic equipment. The photographic equipment provides N exposure time gears, and one exposure time gear corresponds to one exposure time, wherein N is greater than An integer of 1, characterized in that the device comprises: an acquisition unit, configured to acquire a shaking parameter, the shaking parameter is used to indicate the shaking state of the photographing device during the photographing process; A processing unit, configured to predict a set of theoretical blur angles according to the shake parameters currently acquired by the acquisition unit; the set of theoretical blur angles includes theoretical blur angles corresponding to each of the N exposure time length gears, and the theoretical blur angles are The expected value of the blur angle when the function is turned off, and the blur angle is the cumulative change of the lens shake angle during the exposure process; The processing unit is further configured to determine a set of suppression ratios according to the jitter parameters currently acquired by the acquisition unit; the set of suppression ratios includes the suppression ratios corresponding to each of the N exposure time gears under the currently acquired jitter parameters , the suppression ratio is a function of the theoretical blur angle and the suppressed blur angle, and the suppressed blur angle is the expected value of the blur angle when the shake compensation function is turned on; The processing unit is further configured to predict a set of suppressed blur angles according to the set of theoretical blur angles and the set of suppression ratios according to the function of the suppression ratio with respect to the theoretical blur angle and the suppressed blur angle; the set of suppressed blur angles is included in Under the currently acquired jitter parameters, the blur suppression angles corresponding to each of the N exposure duration gears; The obtaining unit is also used to obtain the allowable blur angle; The processing unit is further configured to select one of the suppressed blur angles from the set of suppressed blur angles according to the allowable blur angle obtained by the acquiring unit as a target suppressed blur angle; the allowable blur angle is used to indicate acceptable The maximum suppression blur angle of ; The setting unit is further configured to set a target exposure time gear according to the target blur suppression angle determined by the processing unit, the target exposure time gear being the exposure time gear corresponding to the target blur suppression angle. 16. The device for setting exposure duration according to claim 15, characterized in that: The acquiring unit is also used to acquire a list of suppression ratios; the list of suppression ratios includes the suppression ratios corresponding to each of the N exposure time length gears under different jitter parameters; the values of the suppression ratios in the list of suppression ratios , is a function of the theoretical blur angle and the suppressed blur angle according to the suppression ratio, and is calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppressed blur angle; The processing unit is further configured to query the list of suppression ratios acquired by the acquisition unit according to the jitter parameters, and determine the suppression ratios corresponding to each of the N exposure duration gears under the currently acquired jitter parameters, The set of suppression ratios is obtained. 17. The device for setting exposure duration according to claim 15 or 16, characterized in that, The acquiring unit is specifically configured to acquire the shaking amplitude and shaking period of the photographing device during the photographing process. 18. The device for setting exposure duration according to claim 17, characterized in that: The processing unit is specifically configured to construct a fuzzy angle function according to the jitter amplitude and jitter period in, is the blur angle, t is the exposure start time point, Δt is the exposure duration, A is the jitter amplitude, and λ is the jitter cycle; according to the blur angle function, calculate the theoretical blur angle corresponding to each of the N exposure time gears, and get The set of theoretical blur angles. 19. The device for setting exposure duration according to claim 18, characterized in that: The processing unit is further configured to calculate theoretical blur angles corresponding to each of the N exposure time length gears according to a first formula, and the first formula is: Among them, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, i=1,...N, Δt_i is the exposure time corresponding to the i-th exposure time gear, and λ is the jitter cycle; Alternatively, the processing unit is further configured to calculate theoretical blur angles corresponding to each of the N exposure time length gears according to a second formula, and the second formula is: Wherein, t_j (j=1, . . . P) is P sampling values of the exposure start time point t within one dithering period, and P is an integer greater than 1. 20. The device for setting exposure duration according to any one of claims 15-16, 18-19, characterized in that, The processing unit is specifically configured to select a suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as a target suppressed blur angle. 21. The device for setting exposure duration according to claim 17, characterized in that: The processing unit is specifically configured to select a suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as a target suppressed blur angle. 22. The device for setting exposure duration according to claim 20, characterized in that: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processing unit is further configured to select from the suppression blur angles not greater than the allowable blur angle The blur suppression angle corresponding to the longest exposure time is the target blur suppression angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processing unit is further configured to select the minimum blur angle from the respective corresponding blur suppression angles of the N exposure time long gears. The suppression blur angle of is the target suppression blur angle. 23. The device for setting exposure duration according to claim 21, characterized in that: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processing unit is further configured to select from the suppression blur angles not greater than the allowable blur angle The blur suppression angle corresponding to the longest exposure time is the target blur suppression angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processing unit is further configured to select the minimum blur angle from the respective corresponding blur suppression angles of the N exposure time long gears. The suppression blur angle of is the target suppression blur angle. 24. The device for setting exposure duration according to any one of claims 15-16, 18-19, 21-23, characterized in that, The processing unit is specifically configured to predict and suppress a blur angle set according to the following function of the blur angle; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 25. The device for setting exposure duration according to claim 17, characterized in that: The processing unit is specifically configured to predict and suppress a blur angle set according to the following function of the blur angle; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 26. The device for setting exposure duration according to claim 20, characterized in that: The processing unit is specifically configured to predict and suppress a blur angle set according to the following function of the blur angle; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 27. The device for setting exposure duration according to any one of claims 18-19, 21-23, characterized in that, The obtaining unit is also used to obtain a user's photographing instruction; The processing unit is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 28. The device for setting exposure duration according to claim 20, characterized in that: The obtaining unit is also used to obtain a user's photographing instruction; The processing unit is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 29. A device for setting the exposure time, which is used to set the target exposure time gear of the photographic equipment. The photographic equipment provides N exposure time gears, and one exposure time gear corresponds to one exposure time, where N is greater than An integer of 1, characterized in that the device includes: a processor, a memory, a bus, and a receiver; the processor, the memory, and the receiver are connected to each other through the bus; The receiver is used to acquire a shaking parameter, and the shaking parameter is used to indicate the shaking state of the photographing device during the photographing process; The processor is configured to predict a set of theoretical blur angles according to the jitter parameters currently acquired by the receiver; the set of theoretical blur angles includes theoretical blur angles corresponding to each of the N exposure time length gears, and the theoretical blur angles are in The expected value of the blur angle when the shake compensation function is turned off, and the blur angle is the cumulative change of the lens shake angle during the exposure process; The processor is further configured to determine a set of suppression ratios according to the jitter parameters currently acquired by the receiver; the set of suppression ratios includes the suppression ratios corresponding to each of the N exposure time gears under the currently acquired jitter parameters , the suppression ratio is a function of the theoretical blur angle and the suppressed blur angle, and the suppressed blur angle is the expected value of the blur angle when the shake compensation function is turned on; The processor is further configured to predict a set of suppressed blur angles according to the set of theoretical blur angles and the set of suppression ratios according to the function of the suppression ratio with respect to the theoretical blur angle and the suppressed blur angle; the set of suppressed blur angles is included in Under the currently acquired jitter parameters, the blur suppression angles corresponding to each of the N exposure duration gears; The receiver is also used to obtain the allowable blur angle; The processor is further configured to select one of the suppressed blur angles from the set of suppressed blur angles as a target suppressed blur angle according to the allowable blur angle obtained by the receiver; the allowable blur angle is used to indicate acceptable The maximum suppression blur angle of ; The processor is further configured to set a target exposure time gear according to the target blur suppression angle, and the target exposure time gear is an exposure time gear corresponding to the target blur suppression angle. 30. The device for setting exposure duration according to claim 29, characterized in that: The receiver is also used to obtain a list of suppression ratios; the list of suppression ratios includes the suppression ratios corresponding to each of the N exposure time length gears under different jitter parameters; the values of the suppression ratios in the list of suppression ratios , is a function of the theoretical blur angle and the suppressed blur angle according to the suppression ratio, and is calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppressed blur angle; The processor is further configured to query the list of suppression ratios acquired by the receiver according to the jitter parameters, and determine the suppression ratios corresponding to each of the N exposure duration gears under the currently acquired jitter parameters, The set of suppression ratios is obtained. 31. The device for setting exposure duration according to claim 29 or 30, characterized in that: The receiver is specifically used to acquire the shaking amplitude and shaking period of the photographing device during the photographing process. 32. The device for setting exposure duration according to claim 31, characterized in that: The processor is specifically configured to construct a fuzzy angle function according to the jitter amplitude and the jitter period in, is the blur angle, t is the exposure start time point, Δt is the exposure duration, A is the jitter amplitude, and λ is the jitter cycle; according to the blur angle function, calculate the theoretical blur angle corresponding to each of the N exposure time gears, and get The set of theoretical blur angles. 33. The device for setting exposure duration according to claim 32, characterized in that: The processor is further configured to calculate theoretical blur angles corresponding to each of the N exposure duration gears according to a first formula, and the first formula is: Among them, ψ_i is the theoretical blur angle corresponding to the i-th exposure time gear, i=1,...N, Δt_i is the exposure time corresponding to the i-th exposure time gear, and λ is the jitter cycle; Alternatively, the processor is further configured to calculate theoretical blur angles corresponding to each of the N exposure duration gears according to a second formula, and the second formula is: Wherein, t_j (j=1, . . . P) is P sampling values of the exposure start time point t within one dithering period, and P is an integer greater than 1. 34. The device for setting exposure duration according to any one of claims 29-30, 32-33, characterized in that, The processor is specifically configured to select a suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as a target suppressed blur angle. 35. The device for setting exposure duration according to claim 31, characterized in that: The processor is specifically configured to select a suppressed blur angle smaller than or close to the allowable blur angle from the set of suppressed blur angles as a target suppressed blur angle. 36. The device for setting exposure duration according to claim 34, characterized in that: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processor is further configured to select from the suppression blur angles that are not greater than the allowable blur angle The blur suppression angle corresponding to the longest exposure time is the target blur suppression angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processor is further configured to select the minimum blur angle from the respective corresponding blur suppression angles of the N exposure time long gears. The suppression blur angle of is the target suppression blur angle. 37. The device for setting exposure duration according to claim 35, characterized in that: When at least one of the suppression blur angles corresponding to each of the N exposure time long gears is not greater than the allowable blur angle, the processor is further configured to select from the suppression blur angles that are not greater than the allowable blur angle The blur suppression angle corresponding to the longest exposure time is the target blur suppression angle; When the blur suppression angles corresponding to each of the N exposure time long gears are greater than the allowable blur angle, the processor is further configured to select the minimum blur angle from the respective corresponding blur suppression angles of the N exposure time long gears. The suppression blur angle of is the target suppression blur angle. 38. The device for setting exposure duration according to any one of claims 29-30, 32-33, 35-37, characterized in that, The processor is specifically configured to predict and suppress a set of blur angles according to the function of the following blur angles; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 39. The device for setting exposure duration according to claim 31, characterized in that: The processor is specifically configured to predict and suppress a set of blur angles according to the function of the following blur angles; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 40. The device for setting exposure duration according to claim 34, characterized in that: The processor is specifically configured to predict and suppress a set of blur angles according to the function of the following blur angles; Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle. 41. The device for setting exposure duration according to any one of claims 32-33, 35-37, characterized in that, The receiver is also used to obtain the user's camera instruction; The processor is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 42. The device for setting exposure duration according to claim 34, characterized in that: The receiver is also used to obtain the user's camera instruction; The processor is further configured to, after setting the target exposure time gear, according to the time point when the photographing instruction is received, and the blur angle function Determine the value t_0 of the exposure start time point t; the blur angle function There is a minimum value at point (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure duration gear. 43. A camera, characterized by comprising the device for setting the exposure time according to any one of claims 15-42.