WO2017177407A1

WO2017177407A1 - Method and apparatus for setting exposure duration, and photographic device

Info

Publication number: WO2017177407A1
Application number: PCT/CN2016/079215
Authority: WO
Inventors: 李付生; 胡毅超; 贾飞; 徐荣跃
Original assignee: 华为技术有限公司
Priority date: 2016-04-13
Filing date: 2016-04-13
Publication date: 2017-10-19
Also published as: CN107493686B; CN107493686A

Abstract

A method and apparatus for setting an exposure duration, and a photographic device, these relating to the field of electronic products and being capable of improving the sharpness of a picture. The specific solution is: acquiring a jitter parameter (101); predicting a set of theoretical fuzzy angles according to the currently acquired jitter parameter (103); determining a set of rejection ratios according to the currently acquired jitter parameter (104); according to the set of theoretical fuzzy angles and the set of rejection ratios, predicting a set of rejection fuzzy angles based on functions of a rejection ratio with regard to a theoretical fuzzy angle and a rejection fuzzy angle (105); acquiring an allowable fuzzy angle (106), selecting, according to the allowable fuzzy angle and from the set of rejection fuzzy angles, one rejection fuzzy angle as a target rejection fuzzy angle (107); and setting a target exposure duration level (108), wherein the target exposure duration level is one of at least two exposure duration levels provided by a photographic device.

Description

Method, device and camera device for setting exposure time

Technical field

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

Background technique

At present, various mobile phones on the market usually have a camera function. During the camera process, the jitter of the user when holding the mobile phone affects the definition of the photo. The existing solution is through an optical image stabilizer (English full name: Optical Image Stabilization (English abbreviation: OIS) performs jitter compensation to suppress the effects of jitter on imaging.

For example, the information about the jitter condition of the mobile phone is sampled by the gyroscope, and the amount of jitter compensation is calculated according to the information, and then the camera lens or the photosensitive element in the camera is driven to perform the shake compensation according to the compensation amount, or both are driven to perform the shake compensation.

Jitter compensation can improve the clarity of photos to some extent. In the photographic process, when the jitter frequency and the jitter amplitude are constant, the amount of jitter compensation is different, and the sharpness of the photograph is different. However, the sharpness of the photo is not only affected by the amount of jitter compensation, but also by the length of exposure. In the case where the amount of jitter compensation is constant, if the exposure duration is different, the sharpness of the photo will be different.

Existing camera devices, such as smart phones and digital cameras, usually provide different camera modes, such as night scene mode, portrait mode, etc. Each camera mode corresponds to a fixed exposure time. Alternatively, the user manually sets the exposure duration based on personal experience in the custom mode. Therefore, in the prior art photographic apparatus, in the case where the shooting mode is determined, regardless of the actual jitter during the photographing process, a fixed exposure time is used, which often results in poor definition of the photograph.

Summary of the invention

The present application provides a method, a device and a camera device for setting an exposure time length, which can It is enough to set the optimum exposure time position according to the actual shaking condition of the camera equipment during the photography process, thereby improving the sharpness of the photograph.

To achieve the above objectives, the present application adopts the following technical solutions:

In a first aspect, a method for setting an exposure duration is provided for setting a target exposure time slot of a camera device, the camera device provides N exposure time slots, and an exposure time slot corresponds to an exposure duration, wherein N is An integer greater than 1, specifically including:

Firstly, the jitter parameter is determined according to the jitter state of the camera device during the photographing process, and the theoretical blur angle corresponding to each of the N exposure time slots is predicted, and then N is predicted according to the respective suppression ratios of the N exposure time slots in the current jitter state. Each of the exposure time slots has a corresponding suppression blur angle, and the target suppression blur angle is selected according to the allowable blur angle, and the exposure time slot corresponding to the target suppression blur angle is set as the optimum exposure time slot. In the photographic process, the camera device predicts the blur angle in the case where the shake compensation function is turned on according to the actual shake condition, that is, suppresses the blur angle, and according to the allowable blur angle from the suppression blur angle corresponding to each of the N exposure time slots Select one as the target to suppress the blur angle, and finally set the target exposure time slot to achieve the purpose of setting the optimum exposure time slot according to the actual jitter condition.

In combination with the first aspect, in a first possible implementation, a suppression ratio list is stored in the camera device, and after the jitter parameter is acquired in the photographing process, the suppression ratio list is obtained according to the jitter parameter, and N exposure time slots are obtained. The respective suppression ratios. In actual production, a list of suppression ratios of a camera device can be obtained by experimental measurement, and a list of suppression ratios is input to the camera device.

In combination with the first aspect, in the second possible implementation, since the suppression blur angle is mainly affected by the jitter amplitude and the jitter period, the jitter amplitude and the jitter period are used as the jitter 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 length Δt, thus constructing a blur angle function, that is, a 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 condition is considered, but also the influence of the exposure start time point t and the exposure time length Δt on the blur angle is further considered. .

In combination with the second possible implementation, in a third possible implementation, one The theoretical blur angle corresponding to the exposure time slot is: when the exposure time length Δt is the exposure time corresponding to the exposure time slot, the integration and jitter of the blur angle function in the one jitter period λ with respect to the exposure start time point t The ratio of the period λ. Since the fuzzy angle function is a periodic function, the ratio of the integral of the blur angle function within one jitter period λ to the jitter period λ reflects the average level of the theoretical blur angle.

In combination with the second possible implementation manner, in the fourth possible implementation manner, the theoretical blur angle corresponding to an exposure time slot is when the exposure time length Δt is the exposure duration corresponding to the exposure time slot, the blur The average of the P sample values of the angular function within one jitter period λ. Since the fuzzy angle function is a periodic function, the average value of the sampled values of the fuzzy angle function in one jitter period λ also reflects the average level of the theoretical blur angle.

In a second aspect, there is provided a device for setting an exposure duration for implementing the method of setting an exposure duration provided by the first aspect.

In a third aspect, there is provided another apparatus for setting an exposure duration for implementing the method of setting the exposure duration provided by the first aspect.

In a fourth aspect, a computer readable storage medium is provided. The computer readable storage medium stores program code, and when the program code is executed, implements a method for setting an exposure duration provided by the first aspect.

In a fifth aspect, a photographic apparatus is provided, comprising the apparatus for setting an exposure duration provided by the second aspect or the third aspect.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

1 is a schematic flow chart of a method for setting an exposure time length according to an embodiment of the present invention;

2 is a schematic diagram showing changes in jitter angle with time in an embodiment of the present invention;

3 is a schematic view showing the blur angle in the embodiment of the present invention;

4 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 5 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 6 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 7 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 8 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 9 is a schematic view showing the blur angle in the embodiment of the present invention;

Figure 10 is a schematic view showing the blur angle in the embodiment of the present invention;

FIG. 11 is a schematic diagram showing the blur distance in the embodiment of the present invention; FIG.

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

Figure 13 is a schematic illustration of the diameter of a blurring range that is least perceptible to a human eye when viewing a picture in an embodiment of the present invention;

FIG. 14 is a schematic diagram showing the calculation of the allowable blur angle in the embodiment of the present invention; FIG.

FIG. 15 is a schematic diagram showing another calculation manner of the allowable blur angle in the embodiment of the present invention; FIG.

FIG. 16 is a schematic diagram showing a variation of an experimental value of a suppression blur angle according to an exposure time length according to an embodiment of the present invention; FIG.

Figure 17 is a schematic illustration of the target suppression blur angle in the embodiment of the present invention;

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

Figure 19 is a schematic illustration of an exposure start time point in an embodiment of the present invention;

20 is a schematic structural diagram of an apparatus for setting an exposure duration according to an embodiment of the present invention;

FIG. 21 is a schematic structural diagram of another apparatus for setting an exposure duration according to an embodiment of the present invention.

detailed description

Embodiments of the present invention provide a method, apparatus, and photographing for setting an exposure duration The device and the camera device can be a camera-enabled device such as a mobile phone, a tablet computer, or a digital camera.

The camera device provides N exposure time slots, and an exposure time slot corresponds to an exposure time length, where N is an integer greater than one. For example, as shown in Table 1, the number of exposure time slots is 8, and the corresponding exposure time is from 1/2 second to 1/32 second.

Table I

曝光时长档位 Exposure time	11	22	33	44	55	66	77	88
曝光时长(秒)Exposure time (seconds)	1/21/2	1/41/4	1/81/8	1/101/10	1/121/12	1/161/16	1/201/20	1/321/32

During the photography process, the camera device sets one of the N exposure time slots as the target exposure time slot according to its actual jitter condition, and then starts the exposure process. The exposure duration is the exposure duration corresponding to the target exposure time slot. During each camera, the camera can set the target exposure time slot according to its actual jitter condition to obtain a better-resolution photo.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Example

Embodiments of the present invention provide a method for setting an exposure duration for setting a target exposure time slot of a camera device, a camera device providing N exposure time slots, and an exposure time slot corresponding to an exposure duration, wherein N For an integer greater than 1, as shown in Figure 1, the following steps are included:

101. Obtain a jitter parameter.

Wherein, the jitter parameter is used to indicate the jitter state of the camera device during the photographing process. The jitter parameter may specifically include parameters for indicating the degree of acceleration, tilt of the camera device in different directions, which may be sampled by the motion sensor. Motion sensor can pack At least one of a three-axis gyroscope, a six-axis gyroscope, an accelerometer, and the like.

Optionally, the jitter parameter includes jitter amplitude and jitter period of the photographic device during photography. The jitter amplitude refers to the maximum value of the lens shake angle during the shaking of the camera.

The angle of jitter is a function of time, as shown in Figure 2, the angle of jitter

Where A is the jitter amplitude, λ is the jitter period, and t is the time. The function of the dither angle y with respect to the time t is referred to as a dithering wave function, and the dithering wave function may further include an initial phase of t, which is illustrated in the embodiment of the present invention with an initial phase of 0 for ease of calculation.

Of course, the jitter wave function may also be other forms, such as a cosine function or the like. The present invention is not limited to its specific form, and only the case of a sine function is taken as an example.

In reality, the angle of jitter of the camera device may be the result of a superposition of multiple jitter wave functions. The jitter of different jitter periods (jitter frequency) has different effects on the sharpness of the photo. By processing the original signal sensed by the motion sensor, the signal corresponding to the jitter that has the greatest influence on the sharpness of the photo can be selected.

For example, the original signal sensed by the motion sensor is usually an analog signal, and after being converted by a digital converter, the digital signal is Fourier transformed to obtain a set of digital signals of different jitter periods. The Fourier-transformed digital signal is filtered by a band-pass filter to filter out signals at frequencies that have less influence on sharpness, and to retain signals at frequencies that have a greater influence on sharpness. Finally, the jitter amplitude and jitter period are determined based on the bandpass filtered digital signal.

102. Acquire a photo instruction of the user.

The photographing instruction is used to instruct the photographing device to start the photographing process. For example, the camera command 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

steps

101 and 102 is variable. For example, step 101 is in the previous step 102. is behind. For example, the camera device is a smartphone, and when the user opens the camera application, the camera device begins sampling the jitter parameters. Alternatively, step 102 is preceded by the previous step 101. When the user opens the camera application, the camera device does not sample the jitter parameter at the moment, and when the user presses the camera button, the sampling jitter parameter is started.

103. Predict a theoretical fuzzy angle set according to the currently obtained jitter parameter.

<1>, blur angle

use Indicates the blur angle,

For the cumulative variation of the lens's jitter angle during exposure, usually, the smaller the blur angle, the better the picture sharpness. 3 is a schematic diagram showing 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 the rectangle 301, the rectangle 302, and the rectangle 303 are both Δt, and the portion of the dithering wave function within the respective widths of the three rectangles represents the trajectory of the lens shake angle during the exposure, and the variation of the jitter angle is always positive, that is,

The value is always positive.

When the t_0 time point is the exposure start time point, the jitter angle y monotonically increases during the exposure process.

The size of the rectangle is 301,

When the time point of t_1 or t_2 is the exposure start time point, the jitter angle y is not a monotonic function during the exposure process, and needs to be calculated separately in each monotonic interval.

The value is added and the cumulative change in jitter angle during the entire exposure process is summed.

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

The size is 2 times the height of the rectangle 302.

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

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

From the time point t_4 to the end of exposure, the amount of change in the lens shake angle is the height of the rectangle 303.

The size is the sum of the change from the time t_2 to the time t_4, and the change from the time t_4 to the end of the 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 shake angle during the exposure may sweep the maximum twice. In this case,

The value is 2A. The width of the rectangle 401 in FIG. 4 is larger than the jitter period λ and the height is 2A.

<1.1>, fuzzy angle function

As shown in FIG. 3, in the case where the jitter wave function is determined, when the exposure duration is constant, the exposure start time point is different, and the blur angle is

The size is different. The embodiment of the present invention expresses the relationship of the blur angle with the jitter amplitude, the jitter period, the exposure start time point, and the exposure duration by the blur angle function, that is, the blur angle function is a multivariate function with respect to the above four physical quantities.

Optionally, constructing a blur angle function according to the jitter amplitude and the jitter period,

Represents the fuzzy angle function,

For the blur angle, t is the exposure start time point, and Δt is the exposure time length. A and λ are the current acquisition jitter parameters (jitter amplitude and jitter period) of the camera device, which is a constant, that is to say, after the jitter parameter is determined, the blur angle is only related to the exposure start time point and the exposure time length, so the blur angle function can also Abbreviated as

<1.1.1>, the periodicity of the fuzzy angle function

The dithering wave function y is a periodic function with respect to the exposure start time point t, and as shown in Fig. 5, t_5 = t_0 + λ, then y(t = t_5) = y (t = t_0). When the exposure duration is constant, the blur angle when the t_0 time point 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.

Blurring angle

It is also a periodic function with respect to the exposure start time point t.

Further, the blur angle

It is used to measure the amount of change in the jitter angle, and its value is always positive. The blur angle when the t_0 time point is the exposure start time point is equal to the blur angle when t_0+λ/2 is the exposure start time point. 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.

Fuzzy angle function

For a periodic function with respect to t with a period of λ/2, its period with respect to t is half of the jitter period λ.

<1.1.2>, the specific form of the fuzzy angle function

Since the blur angle function is a periodic function with respect to t in the period of λ/2, an embodiment of the present invention will be described with one cycle. Specifically, taking the case of the interval t∈[0,λ/2] as an example, the specific expression of the jitter wave function is explained:

<1.1.2.1>,

Fuzzy angle function

Combined with Figure 6, when

The change track of the lens shake angle during the exposure is the portion within the width of the rectangle 601.

when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 602.

when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 603.

when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 604.

<1.1.2.2>,

Fuzzy angle function

Combined with Figure 7, when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 701.

when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 702.

when

At the time of the exposure, the change track of the lens shake angle during the exposure is a portion within the width of the rectangle 703.

<1.1.2.3>,

Fuzzy angle function

Combined with Figure 8, when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 801.

when

When the exposure, the trajectory of the lens shake angle is swept twice, in this case

The value is 2A.

when

The change track of the lens shake angle during the exposure is the portion within the width of the rectangle 802.

when

At the time of the exposure, the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 803.

<1.1.2.4>,

Fuzzy angle function

Combined with Figure 9, when

The value is 2A.

when

At the time of the exposure, the change track of the lens shake angle during the exposure is a portion within the width of the rectangle 901.

when

The change track of the lens shake angle during the exposure is the portion within the width of the rectangle 902.

when

The value is 2A.

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

Combined with Figure 10, when

When the exposure angle of the lens shake angle is within the width range of the rectangle 1001, the width of the rectangle 1001 is infinite, and the change track of the lens shake angle during the exposure may sweep the maximum value multiple times.

The value is 2A.

<2>, theoretical blur angle

The theoretical blur angle is the expected value of the blur angle in the case where the shake compensation function is turned off, that is, the theoretical blur angle is the expected value of the blur angle corresponding to a certain exposure time length, assuming that there is no jitter compensation function, which is calculated by calculation. Predictive value.

<2.1> Theoretical fuzzy angle function

The embodiment of the present invention expresses the relationship between the theoretical blur angle and the jitter amplitude, the jitter period, the exposure start time point, and the exposure duration by the theoretical blur angle function, that is, the theoretical blur angle function is a multivariate function with respect to 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 device obtains the jitter parameter, the jitter amplitude A and the jitter period λ constant, that is, after the jitter parameter is 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 fuzzy angle function

For a periodic function with respect to t with a period of λ/2, the expected value of the blur angle may be an average value of the blur angle in one cycle.

Of course, since the blur 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 will be described by taking an example in which the expected value in two periods is calculated as the theoretical blur angle.

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

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

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

The theoretical blur 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 integral interval length λ is twice the period of the blur angle function λ/2, so the theoretical blur angle is the expected value of the blur angle in two periods.

Exposure time Δt=Δt_i (i=1,...N), Δt_i is the exposure duration corresponding to the i-th exposure time slot of the camera device. Referring to Table 1, the exposure duration corresponding to the exposure time slot is known. Constant value.

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

Specifically, the theoretical blur angle corresponding to each of the N exposure time slots is calculated by the first formula, and the first formula is:

Where ψ_i is the theoretical blur angle corresponding to the i-th exposure time slot, k=0.

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

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

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

Exposure time Δt=Δt_i (i=1,...N), corresponding to the N exposure time slots On the fuzzy angle, the exposure time length Δt_i of each of the N exposure time slots can be calculated by substituting the theoretical blur angle function ψ=g(t, Δt).

Specifically, the theoretical blur angle corresponding to each of the N exposure time slots is calculated by the second formula, and the second formula is:

<3>, theoretical fuzzy angle set

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

Table II

曝光时长档位 Exposure time	11	22	33	44	……......	NN
曝光时长(Δt_i)Exposure time (Δt_i)	Δt_1Δt_1	Δt_2Δt_2	Δt_3Δt_3	Δt_4Δt_4	……......	Δt_NΔt_N
理论模糊角集合(ψ_i)Theoretical fuzzy angle set (ψ_i)	ψ_1Ψ_1	ψ_2Ψ_2	ψ_3Ψ_3	ψ_4Ψ_4	……......	ψ_Nψ_N

104. Determine a suppression ratio set according to the currently obtained jitter parameter.

<3> suppression ratio

The suppression ratio is used to indicate the ability of the photographic device to suppress the jitter. Under certain jitter parameters, the photographic device has a stronger ability to suppress the jitter, and the resolution of the photo is higher.

Alternatively, in the embodiment of the present invention, the suppression ratio is expressed by a function of a theoretical blur angle and a suppression blur angle, wherein the suppression blur angle is an expected value of the blur angle in the case where the shake compensation function is turned on. Specifically, the suppression ratio is a function of a theoretical blur angle and a suppression blur angle:

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 suppression blur angle. The greater the suppression ratio, the stronger the ability of the camera device to suppress jitter.

The suppression ratio reflects the anti-shake property of the camera device, and the experiment can be calculated based on the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle. The following describes the process of obtaining the theoretical fuzzy angle and the experimental value of suppressing the blur angle.

<3.1>Measure the experimental value of the theoretical fuzzy angle 获取

The camera unit is mounted on a dithering station that provides a certain jitter amplitude and jitter period. The theoretical blur angle ψ corresponding to each exposure time length is determined according to the jitter amplitude and the jitter period. The calculation process is shown in step 103 and will not be described here.

In addition, in combination with step 103, the blur angle and the magnitude of the theoretical blur angle are proportional to the jitter amplitude under the same jitter period. 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 the theoretical blur angle is calculated in step 103, the theoretical blur angle g(t, Δt, A=1, λ) when A=1 is first calculated, and then the theoretical blur angle when A=X is obtained is Xg ( t, Δt, A = 1, λ). In addition, when experimentally measuring the theoretical blur angle, the jitter amplitude of the jitter stage only needs to be set to 1°, and the theoretical blur angle when the jitter amplitude is other values can be based on g(t, Δt, A=X, λ)= Xg(t, Δt, A = 1, λ) is calculated. For example, the experimental value of the theoretical blur angle 如 as shown in Table 3 is measured at a jitter amplitude of 1°:

Table 3

In combination with Table 3, the jitter period is 1/8 second, and when the exposure time is 1/16 second, the experimental value of the corresponding theoretical blur angle is 1.41°. In the case where the jitter amplitude is 2°, when the jitter 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° times 2. The following content of the present embodiment will be described by taking a case where the jitter amplitude is 1°.

<3.2> Measurement to obtain the experimental value of the suppression blur angle ψ_ON

The suppression of blur angle can be calculated by the amount of blur. The method of calculating the amount of blur is specified in the Camera & Imaging Products Association (English name: Camera & Imaging Products Association, English abbreviation: CIPA) standard, and will not be described again. The process of calculating the blur angle based on.

Referring to Fig. 11, O is the object to be photographed, and the distance between the position of the O point and the lens 1101 of the photographic apparatus is the object distance, and the object distance is represented by U.

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

The blur distance is the length value of the blur range calculated from the blur amount in the case where the camera device shake compensation function is turned on, and the blur distance is represented by M. The blur amount is usually expressed by the number of pixels, and the blur distance is the product of the blur amount and the pixel diameter, and the blur distance can be considered as the diameter of the blur amount range.

The angle between the two end points of the diameter of the blurring amount range and the line connecting the focus of the lens 1101 is to suppress the blur angle ψON, and its size is:

According to the convex lens imaging formula:

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

After the corresponding blurring amount is obtained under different jitter periods and jitter amplitudes, the experimental value of the suppression blur angle ψ_ON is calculated according to the final calculation formula of the suppression blur angle ψ_ON. For example, when the jitter amplitude is 1°, the suppression of the blur angle 所示 as shown in Table 4 is measured. Experimental value:

Table 4

Further, multiple sets of experimental values can be measured multiple times, and the experimental values of the final suppressed blur angle ψ are obtained by averaging the multiple sets of experimental values.

<3.3> Suppression ratio list

The suppression ratio list includes the suppression ratios corresponding to the respective exposure time slots of the N exposure time periods under different jitter parameters. The value of the suppression ratio in the suppression ratio list is calculated from the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the suppression ratio with respect to the theoretical blur angle and the suppression blur angle.

The experimental values of the theoretical blur angles in Table 3 and the experimental values of the suppression blur angles in Table 4 are substituted into the suppression ratios for the theoretical blur angle and the suppression blur angle.

Calculate the value of the suppression ratio when the jitter amplitude is 1°. The data included in the suppression ratio list is shown in Table 5:

Table 5

After the suppression ratio list is obtained, the inhibition ratio list is input to the photographic apparatus, and the photographic apparatus stores the suppression ratio list, so that the photographic apparatus can apply the suppression ratio list during the photographic process. The suppression ratio list can be entered before the camera device is shipped from the factory, or it can be entered by software update after shipment.

It should be noted that the actual storage suppression ratio list of the camera device can be various, 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. Embodiments of the present invention do not limit a specific data storage structure.

<3.4>, suppression ratio set.

As shown in Table 6, the suppression ratio set includes the suppression ratios corresponding to the respective N exposure time slots under the currently acquired jitter parameters. DB_i (i = 1, ... N) in Table 6 represents the N suppression ratios corresponding to the N exposure time slots.

Table 6

曝光时长档位 Exposure time	11	22	33	44	……......	NN
曝光时长(Δt_i)Exposure time (Δt_i)	Δt_1Δt_1	Δt_2Δt_2	Δt_3Δt_3	Δt_4Δt_4	……......	Δt_NΔt_N
抑制比集合(DB_i)Suppression ratio set (DB_i)	DB_1DB_1	DB_2DB_2	DB_3DB_3	DB_4DB_4	……......	DB_NDB_N

The specific value of DB_i can be obtained by querying the suppression ratio list according to the jitter parameter. For example, after the camera device acquires the jitter parameter during photography, it is determined that the current jitter amplitude is 1° and the jitter period is 1/8 second. Combined with Table 5, the camera device query suppression ratio In the list, it is determined that the suppression ratio corresponding to the 1/16 second exposure time slot is 18.7, and the suppression ratio corresponding to the 1/32 second exposure time slot is 15.89.

Steps

104 and 103 do not have a sequence. That is, after the camera device obtains the jitter parameter, the set of suppression ratios may be determined after predicting the theoretical blur angle set, or the set of prediction angles may be determined first after the suppression ratio set, or may be performed simultaneously in two steps.

105. Predicting a set of suppression angles.

As shown in Table 7, the suppression of the blur angle set includes the suppression blur angle corresponding to each of the N exposure time slots under the currently acquired jitter parameter. ψ_ON_i (i=1, . . . N) in Table 7 represents N suppression blur angles corresponding to N exposure time slots.

Table 7

Combined with <3.2>, in the experimental test phase, the experimental value of the fuzzy angle ψON is the experimental value obtained from the experiment. Here, the specific value of the suppression blur angle ψON_i(i=1, . . . N) in the fuzzy angle set is suppressed according to the theoretical blur angle set and the suppression ratio set, according to the suppression ratio with respect to the theoretical blur angle and the suppression blur angle function. , calculate the predicted value.

Combining the theoretical fuzzy angle set shown in Table 2, and the suppression ratio set shown in Table 6, according to the suppression ratio, the function of the theoretical blur angle and the suppression blur angle:

ψ_ON_i can be derived by 上述_i and DB_i by the above function relation.

That is to say, in the experimental stage, under certain jitter parameters, according to the experimental value of the theoretical fuzzy angle 实 obtained by the actual measurement, and the experimental value of suppressing the blur angle ψ ON, according to

The forward calculation determines the suppression ratio DB, and finally the suppression ratio list is obtained. Briefly expressed as (ψ, ψ_ON) ==> DB.

In the actual photographic process, after acquiring the jitter parameter, predicting the theoretical blur angle set ψ_i according to the currently acquired jitter parameter, determining the suppression ratio set DB_i according to the currently obtained jitter parameter, and then according to

The reverse push gets ψ_ON_i. Briefly expressed as (ψ, DB) ==> ψ _ON.

106. Obtain an allowable blur angle ψ_max

The allowable blur angle ψ_max is used to indicate an acceptable maximum suppression blur angle, which may be a preset value or a value actually calculated by the camera 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 of the two object points that can be resolved by the human eye to the 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 object point W1 and the object point W2 and the line connecting the eyeball is the minimum resolvable angle α of the human eye. The size of 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, and is usually 1/60°.

According to the minimum resolvable angle α of the human eye, it is possible to calculate the diameter a of the blurring range that the human eye can perceive when viewing the picture with a certain viewing distance. Specifically, as shown in FIG. 13, when the viewing distance is s, there are:

The viewing distance can be a preset value or manually selected by the user. For example, if the camera device is specifically a mobile phone, the preset viewing distance can be 30 cm. Or provide the user with several viewing distances, which are useful for selection.

In conjunction with the blur distance M on the photosensitive element 1102 shown in Fig. 11, the diameter a of the blurring range that can be perceived by the human eye on the photograph corresponds to the maximum blur distance b allowed on the photosensitive element 1102. Let d denote the length of the long side of the photosensitive element, and c denote the length of the long side of the photo.

get:

In the case where the maximum allowable blur distance b is determined, the allowable blur angle can be further calculated. When the imaging positions of the subject O on the photosensitive element 1102 are different, the calculation manner of the allowable blur angle ψ_max is different, and the following describes different imaging positions.

<4.1> Calculation of ψ_max when imaging at the center of the photosensitive element

As shown in Fig. 14, when the image forming position of the object O on the photosensitive member 1102 is at the center position of the photosensitive member 1102, there are:

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

Further, according to

get:

<4.2> Calculation of ψ_max when imaging at the edge position of the photosensitive element

As shown in Fig. 15, when the image forming position of the object O on the photosensitive member 1102 is at the edge position of the photosensitive member 1102, there are:

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

Further, according to

get:

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

When the object O is imaged on the photosensitive element 1102, the photosensitive element When the center position and the edge position of 1102 are between, the calculation method is similar to that of the imaging described in <4.2> at the edge position, and will not be described again.

The photograph taken actually by the camera device has a measured suppression blur angle larger than the allowable blur angle ψ_max, indicating that the user can observe that the photograph (partial) is unclear. If the measured suppression blur angle is not greater than the allowable blur angle ψ_max, it means that the sharpness of the photograph is within the acceptable range of the human eye.

107. Determine the target suppression blur angle ψ opt.

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

Referring to FIG. 16 , a graph showing the variation of the experimental value of the blur angle ψ_ON with the exposure time length Δt under a certain jitter parameter. In Fig. 16, Δt_a to Δt_i are sequentially increased. When the exposure time length Δt is increased, the suppression blur angle ψON is first decreased and then increased, and the change trend is U-shaped.

The target suppression blur angle ψ opt is less than or close to the allowable blur angle ψ_max. The following describes two specific ways to determine the target suppression blur angle ψ opt.

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

In the suppression blur angle set ψ_ON_i (i=1, . . . N), when at least one of the suppression blur angles corresponding to each of the N exposure time slots is not greater than the allowable blur angle ψ_max, it is never greater than the allowable blur angle ψ_max. Any one of the suppression blur angles is selected as the target suppression blur angle ψ opt.

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

Preferably, considering the influence of the exposure amount on the quality of the photograph, the exposure time is extended as much as possible to increase the exposure amount while ensuring the sharpness of the photograph. In the suppression blur angle set ψ_ON_i (i=1, . . . N), when at least one of the suppression blur angles corresponding to each of the N exposure time slots is not greater than the allowable blur angle, the suppression blur is never greater than the allowable blur angle. Select one of the angles corresponding to the longest exposure time to suppress the blur angle ψ_ON as the target suppression Blur angle.

The exposure time corresponding to Δt_g in Δt_c to Δt_g is the largest as indicated by the arrow in Fig. 17, in which case the corresponding suppression blur angle ψ_ON corresponding to Δt_g is selected as the target suppression blur angle.

<5.2>, another way to determine the target suppression blur angle ψ opt

In the suppression of the fuzzy angle set ψ_ON_i (i=1, . . . N), when the suppression blur angles corresponding to the N exposure time slots are larger than the allowable blur angle ψ_max, the suppression blur corresponding to each of the N exposure time slots Selecting the smallest suppression blur angle in the angle is the target suppression blur angle ψ opt.

As shown in FIG. 18, the respective suppression blur angles of Δt_a to Δt_i are larger than the allowable blur angle ψ_max, and the suppression blur angle corresponding to Δt_d is the smallest, that is, the closest 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 slot.

The target exposure time slot is the exposure time slot corresponding to the target suppression blur angle ψ opt.

As shown in FIG. 17, the target suppression blur angle ψ opt is the corresponding suppression blur angle ψ_ON corresponding to Δt_g, and then the target exposure time shift position is the exposure time shift position corresponding to Δt_g.

As shown in FIG. 18, the target suppression blur angle ψ opt is the corresponding suppression blur angle ψ_ON corresponding to Δt_d, and then the target exposure time slot is the exposure time slot corresponding to Δt_d.

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

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

Combine the fuzzy angle function in <1.1>

Description, when the exposure duration Δt, the jitter amplitude A, and the jitter period λ are determined, when the blur angle function

The value may be different, so a reasonable selection of the exposure start time point t helps to reduce the blur angle and obtain a high-definition photo.

In addition, combined with <1.1.1> to <1.1.2>, the fuzzy angle function

For a periodic function with respect to t with a period of λ/2, there are minimum and maximum values in one cycle.

Referring to FIG. 19, at time t0, the camera device acquires the jitter amplitude A and the jitter period λ according to the actual jitter condition, and determines the blur angle function.

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

Camera device according to the blur angle function

And determining the values of Δt, A, and λ to determine the blur 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 at (t=t_0, Δt=Δt_0, A, λ), so the camera can start the exposure process at t=t_0+k(λ/2), and obtain the exposure according to the set exposure time. The best shooting results.

Values of <6>, t0, t1, and t_0

<6.1>, the value of t0

The value of t0 depends on when the camera device acquires the jitter parameter.

For example, the camera device starts sampling jitter parameters at time 0 (origin position in FIG. 19) and processes the sampled signals, including Fourier transform bandpass filtering. The value of t0 is the starting time point of the sampling jitter parameter, plus the sum of delays caused by signal transmission and signal processing.

<6.2>, the value of t1

The value of t1 depends on the time the camera device sets the exposure time.

For example, after the camera device obtains the jitter parameter, a series of calculations are performed according to the jitter parameter to determine the target suppression blur angle ψ_opt, and finally the time required for the target exposure time slot is set, and t0 is obtained to obtain the value of t1.

Of course, the camera equipment may still need to do other signal processing or data calculation to complete For other functions, you only need to add these time overheads to determine the value of t1.

<6.3>, the value of t_0

The value of t_0 depends on the blur angle function

The nature of itself.

Fuzzy angle function

It goes through its minimum point every cycle. After the camera device sets the target exposure time slot, 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 slot position, the blur angle function is used.

The time point at which the minimum value is reached for the first time is taken as the t_0 time point.

The method for setting the exposure duration provided by the embodiment of the present invention obtains a theoretical blur angle set according to the jitter parameter prediction, and then obtains a set of suppression blur angles according to the suppression ratio set prediction, and selects the suppression blur angle set according to the allowable blur angle. The target suppresses the blur angle, and sets the exposure duration to the exposure duration corresponding to the target suppression blur angle, thereby setting the optimum exposure time shift position according to the actual shake condition of the photographing device during the photographing process, thereby improving the sharpness of the photograph. Further, the exposure start time point is selected such 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 photograph.

It should be noted that the method embodiments corresponding to FIG. 1 are all described as a series of action combinations for the sake of simple description, but those skilled in the art should understand that the present invention is not subject to the described action sequence. Limitations, as certain steps may be performed in other sequences or concurrently in accordance with the present invention.

In addition, those skilled in the art should also understand that the embodiments described in the specification belong to the preferred embodiment, and the actions involved are not necessarily required by the present invention. For example, the step of acquiring a photographing instruction of the user may be performed by the user. The trigger acquisition may also be performed when a certain trigger condition set by the software is satisfied. The photographic process described in this embodiment should be considered as an example and not an exhaustive.

Based on the method for setting the exposure duration provided by the embodiment of the present invention, an embodiment of the present invention further provides a device for setting an exposure duration for setting a target exposure time slot of a camera device. The device for setting the exposure duration can be installed in the camera device, or It is also possible to connect to a camera device via a communication line or a communication network. The camera device provides N exposure time slots, and an exposure time slot corresponds to an exposure time length, where N is an integer greater than one.

Referring to FIG. 20, the apparatus 20 for setting the exposure duration includes:

The obtaining unit 201 is configured to acquire a jitter parameter, and the jitter parameter is used to indicate a jitter state of the camera device during the photographing process.

The processing unit 202 is configured to predict a theoretical blur angle set according to the jitter parameter 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 slots, the theoretical blur angle is the expected value of the blur angle in the case where the shake compensation function is off, and the blur angle is the cumulative change amount of the lens shake angle during the exposure process. .

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

The processing unit 202 is further configured to predict the suppression blur angle set according to a function of the suppression ratio with respect to the theoretical blur angle and the suppression blur angle according to the theoretical blur angle set and the suppression ratio set. The suppression blur angle set includes a suppression blur angle corresponding to each of the N exposure time slots under the currently acquired jitter parameter.

The obtaining unit 201 is further configured to obtain an allowable blur angle.

The processing unit 202 is further configured to select one of the suppression blur angles as the target suppression blur angle from the set of suppression blur angles according to the allowable blur angle acquired by the acquisition unit 201. The allowable blur angle is used to indicate an acceptable maximum suppression blur angle.

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

Optionally, the obtaining unit 201 is further configured to obtain a suppression ratio list. The suppression ratio list includes the suppression ratios corresponding to the respective exposure time slots of the N exposure time periods under different jitter parameters. The value of the suppression ratio in the suppression ratio list is the theoretical blur angle and the suppression mode according to the suppression ratio. The function of the paste angle is calculated based on the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle.

The processing unit 202 is further configured to determine, according to the jitter parameter query acquisition unit 201, the suppression ratio list, and determine a suppression ratio corresponding to each of the N exposure time slots under the currently acquired jitter parameter, to obtain a suppression ratio set.

For example, in a specific embodiment, the apparatus 20 that suppresses the ratio of the exposure time set is input and saved before shipment from the factory, or may be input and saved by software update after shipment. During the photographing process, the processing unit 202 obtains a suppression ratio set by querying the saved suppression ratio list.

It should be noted that the device 20 for setting the exposure duration may have various forms of the actual storage suppression ratio list, that is, the device 20 for setting the exposure duration may use various data structures to store the data in the suppression ratio list, not just the data. Store in the form of a table. Embodiments of the present invention do not limit a specific data storage structure.

Optionally, the obtaining unit 201 is specifically configured to acquire a jitter amplitude and a jitter period of the camera device during the photographing process.

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

among them,

For the blur angle, t is the exposure start time point, Δt is the exposure time length, A is the jitter amplitude, and λ is the jitter period. The theoretical blur angle corresponding to each of the N exposure time slots is calculated according to the blur angle function, and a theoretical blur angle set is obtained.

Optionally, the processing unit 202 is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the first formula, where the first formula is:

Where ψ_i is the theoretical blur angle corresponding to the i-th exposure time slot, i=1,...N, Δt_i is the exposure duration corresponding to the i-th exposure time slot, and λ is the jitter period.

Alternatively, the processing unit 202 is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the second formula, where the second formula is:

Where t_j(j=1, . . . P) is a P sample value for the exposure start time point t in one jitter 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, as the target suppression blur angle, a suppression blur angle that is less than or close to the allowable blur angle from the set of suppression blur angles.

Optionally, when at least one of the respective suppression blur angles of the N exposure time slots is not greater than the allowable blur angle, the processing unit 202 is further configured to select a corresponding exposure duration from the suppression blur angles that are not greater than the allowable blur angle. The longest one suppresses the blur angle as the target suppresses the blur angle.

When the respective suppression blur angles of the N exposure time slots are greater than the allowable blur angle, the processing unit 202 is further configured to select the minimum suppression blur angle from the respective suppression blur angles of the N exposure time slots as the target suppression. Blur angle.

Optionally, the processing unit 202 is specifically configured to predict a set of suppression blur angles according to a function of a 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 obtaining unit 201 is further configured to acquire a photographing instruction of the user.

The processing unit 202 is further configured to: after setting the target exposure time slot position, according to the time point when the camera instruction is received, and the blur angle function

The value t_0 of the exposure start time point t is determined. Fuzzy angle function

There is a minimum value at the point of (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure time slot.

Those skilled in the art will appreciate that the apparatus for setting the exposure duration described in the embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment of the software and hardware. Moreover, the present invention may be embodied in one or more computer usable storage media (including but not limited to disk storage, semiconductor memory, optical storage, etc.) having computer usable program code embodied therein. The form of the computer program product. The computer program is stored/distributed in a suitable medium, provided with other hardware or as part of the hardware, or in other distributed forms, such as over the Internet or other wired or wireless telecommunication systems.

The apparatus for setting the exposure duration provided by the embodiment of the present invention obtains a theoretical blur angle set according to the jitter parameter prediction, and then obtains a suppression blur angle set according to the suppression ratio set prediction, and selects the suppression blur angle set according to the allowable blur angle. The target suppresses the blur angle, and sets the exposure duration to the exposure duration corresponding to the target suppression blur angle, thereby setting the optimum exposure time shift position according to the actual shake condition of the photographing device during the photographing process, thereby improving the sharpness of the photograph. Further, the exposure start time point is selected such 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 photograph.

Based on the method for setting the exposure duration provided by the embodiment of the present invention, an embodiment of the present invention further provides another means for setting the exposure duration for setting the target exposure time slot of the camera device. The means for setting the exposure duration may be installed in the photographic apparatus, or may be connected to the photographic apparatus via a communication line or a communication network. The camera device provides N exposure time slots, and an exposure time slot corresponds to an exposure time length, where N is an integer greater than one.

Referring to FIG. 21, the apparatus 21 for setting the exposure duration 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 one another via a bus 213.

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

Program code for carrying out the inventive arrangements is stored in memory 212 and controlled by processor 211 for execution.

The memory 212 may include a volatile memory (English name: volatile memory), for example, a random access memory (English name: random-access memory, English abbreviation: RAM). The memory 212 may also include a non-volatile memory (English name: non-volatile memory), for example, a read-only memory (English 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).

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 hard disk (English full name: solid-state drive, English abbreviation: SSD )Wait. Of course, the memory 212 may also include a combination of the above types of memories.

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

Further, the PLD may be a complex programmable logic device (English full name: complex programmable logic device, English abbreviation: CPLD), field programmable logic gate array (English name: field-programmable gate array, English abbreviation: FPGA), universal Array logic (English full name: generic array logic, 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 implemented:

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

The processor 211 is configured to predict a theoretical blur angle set according to the jitter parameter currently acquired by the receiver 214. The theoretical blur angle set includes N exposure time slots corresponding to each The theoretical blur angle, the theoretical blur angle is the expected value of the blur angle in the case where the shake compensation function is turned off, and the blur angle is the cumulative change amount of the shake angle of the lens during the exposure process.

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

The processor 211 is further configured to predict the suppression blur angle set according to a function of the suppression ratio with respect to the theoretical blur angle and the suppression blur angle according to the theoretical blur angle set and the suppression ratio set. The suppression blur angle set includes a suppression blur angle corresponding to each of the N exposure time slots under the currently acquired jitter parameter.

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

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

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

Optionally, the receiver 214 is further configured to obtain a suppression ratio list. The suppression ratio list includes the suppression ratios corresponding to the respective exposure time slots of the N exposure time periods under different jitter parameters. The value of the suppression ratio in the suppression ratio list is calculated from the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the suppression ratio with respect to the theoretical blur angle and the suppression blur angle.

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

For example, in a specific embodiment, the device 21 of the suppression ratio list is set to be stored in the memory 212 before shipment from the factory, or may be input and saved in the memory 212 by software update after shipment. in. During the photographing process, the processor 211 reads the suppression ratio list from the memory 212 and suppresses it by the query. Than the list, get the suppression ratio set.

It should be noted that the memory 212 may have a variety of forms of the suppression ratio list, that is, the memory 212 may use a plurality of data structures to store the data in the suppression ratio list, not just in the form of a table. Embodiments of the present invention do not limit a specific data storage structure.

Optionally, the receiving unit is specifically configured to obtain a jitter amplitude and a jitter period of the camera device during the photographing process.

Optionally, the processor 211 is configured to construct a blur angle function according to the jitter amplitude and the jitter period.

among them,

Optionally, the processor 211 is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the first formula, where the first formula is:

Alternatively, the processor 211 is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the second formula, where the second formula is:

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

Optionally, when at least one of the respective suppression blur angles of the N exposure time slots is not greater than the allowable blur angle, the processor 211 is further configured to select a corresponding exposure duration from the suppression blur angles that are not greater than the allowable blur angle. The longest one suppresses the blur angle The mark suppresses the blur angle.

When the respective suppression blur angles of the N exposure time slots are greater than the allowable blur angle, the processor 211 is further configured to select the minimum suppression blur angle from the respective suppression blur angles of the N exposure time slots as the target suppression. Blur angle.

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

Optionally, the receiver 214 is further configured to acquire a photographing instruction of the user.

The processor 211 is further configured to: after setting the target exposure time slot position, according to the time point when the camera instruction is received, and the blur angle function

Based on the apparatus for setting the exposure duration provided by the embodiment of the present invention, an embodiment of the present invention further provides a photographic apparatus for implementing the method of setting the exposure duration described in the embodiment of the present invention.

The camera device may specifically be a digital camera, a smartphone with a camera function, a tablet computer, a drone, and the like.

The camera device provides N exposure time slots, and an exposure time slot corresponds to an exposure time length, where N is an integer greater than one. By performing the method of setting the exposure duration provided by the embodiment of the present invention, one of the N exposure time slots is selected during the photographing process, and the exposure process is completed according to the exposure duration corresponding to the selected gear position.

In a particular application scenario, the camera device includes the means for setting the exposure duration as described in the embodiment corresponding to FIG.

Alternatively, the photographic apparatus includes means for setting the exposure duration described in the embodiment corresponding to FIG.

A device for setting an exposure time and a camera device provided by an embodiment of the present invention, The theoretical blur angle set is obtained according to the jitter parameter prediction, then the suppression blur angle set is obtained according to the suppression ratio set prediction, and the target suppression blur angle is selected from the suppression blur angle set according to the allowable blur angle, and the exposure duration is set as the target suppression blur angle. The corresponding exposure time is long, thereby setting an optimum exposure time slot according to the actual jitter condition of the camera device during the photographing process, thereby improving the sharpness of the photograph. Further, the exposure start time point is selected such 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 photograph.

The embodiment of the present invention further provides a computer readable storage medium based on the method of setting the exposure time and the photographic apparatus provided by the embodiments of the present invention. The computer readable storage medium stores program code that, when executed, implements a method of setting an exposure duration as described in an embodiment of the present invention.

For example, in a specific implementation manner, when the method for setting the exposure duration provided by the embodiment of the present invention is implemented by software, or by a combination of software and hardware, the method for setting the exposure duration can be implemented. 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, code on a computer readable storage medium.

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

A storage medium 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 Only Memory, English abbreviation: ROM), electrically erasable programmable read-only memory (English full name: Electrically Erasable Programmable Read Only Memory (English abbreviation: EEPROM), CD-ROM (English full name: Compact Disc Read Only Memory, English abbreviation: CD-ROM) or other optical disc storage, disk storage media or other magnetic storage devices, or can be used Any other medium that carries, stores, and can be accessed by a computer in the form of an instruction or data structure.

Communication media includes any medium that facilitates the transfer of a computer program from one location to another. Various connections for transferring data can be appropriately readable as a computer Storage medium.

For example, if the software uses coaxial cable, fiber optic cable, twisted pair, digital subscriber line (English full name: Digital Subscriber Line, English abbreviation: DSL) or wireless technologies such as infrared, radio and microwave from the website, server or Other remote source transmissions, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave, also include definitions of computer readable storage media referred to in embodiments of the present invention. in.

In an application scenario, the camera device is specifically a smart phone. The method for setting the exposure duration provided by the embodiment 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 smartphone downloads and installs the application installation package by accessing the server. A method of setting an exposure time length provided by an embodiment of the present invention is achieved.

In the above application scenario, the storage medium used by the server for storing the application installation package, the transmission medium for transferring the application installation package between the smart phone and the server, and the storage medium for storing and running the application installation package of the smart phone itself are included in the above application scenario. The definition of a computer readable storage medium referred to in the embodiments of the present invention. In terms of only a mobile phone, the computer readable storage medium includes a secure digital card (English full name: Secure Digital Card, English abbreviation: SD) card, eMMC (English full name: Embedded Multi Media Card, English abbreviation: embedded multimedia card), RAM and more.

A computer readable storage medium for setting an exposure duration provided by an embodiment of the present invention stores and transmits program code or instructions for implementing a method of setting an exposure duration. When the program code or instruction is run or called, 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 the target suppression blur angle is selected from the suppression blur angle set according to the allowable blur angle. The exposure duration is set to the exposure duration corresponding to the target suppression blur angle, thereby setting the optimum exposure time slot according to the actual jitter condition of the camera during the photographing process, thereby improving the sharpness of the photograph. Further, the exposure start time point is selected such 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 photograph.

It is to be noted that, while the invention has been described herein in connection with the embodiments of the invention, Other variations of the disclosed embodiments can be understood and effected by the book. In the claims, the word "comprising" does not exclude other components or steps. A single processor or other unit may fulfill several of the functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that the measures are not combined to produce a good effect.

Those skilled in the art will appreciate that embodiments of the invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can 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.) including computer usable program code. The computer program is stored/distributed in a suitable medium, provided with other hardware or as part of the hardware, or in other distributed forms, such as over the Internet or other wired or wireless telecommunication systems.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of the methods, apparatus, and computer program products of the embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. A device that implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of a flowchart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in a block of a flow or a flow and/or a block diagram of the flowchart Or the function specified in multiple boxes.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more flows of the flowchart or in a block or blocks of the flowchart.

While the invention has been described in connection with the specific embodiments and the embodiments thereof Accordingly, the description and drawings are to be regarded as It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

A method for setting an exposure duration for setting a target exposure time slot of a camera device, the camera device providing N exposure time slots, and an exposure time slot corresponding to an exposure duration, wherein N is greater than 1 An integer, characterized in that the method comprises:

Obtaining a jitter parameter for indicating a jitter state of the camera device during a photographing process;

And predicting a theoretical blur angle set according to the currently obtained jitter parameter; the theoretical blur angle set includes a theoretical blur angle corresponding to each of the N exposure time slots, and the theoretical blur angle is an expected value of the blur angle when the jitter compensation function is off. The blur angle is the cumulative change amount of the lens angle of the lens during the exposure process;

Determining a set of suppression ratios according to the currently obtained jitter parameter; the suppression ratio set includes a suppression ratio corresponding to each of the N exposure time slots under the currently acquired jitter parameter, and the suppression ratio is about a theoretical blur angle and a suppression blur angle a function that suppresses the blur angle as the expected value of the blur angle in the case where the shake compensation function is turned on;

Determining a set of suppression blur angles according to a function of a suppression ratio with respect to a theoretical blur angle and a suppression blur angle according to the theoretical blur angle set and the suppression ratio set; the suppression blur angle set is included under the currently acquired jitter parameter Suppressing the blur angle corresponding to each of the N exposure time slots;

Obtaining an allowable blur angle, selecting one of the suppression blur angles as the target suppression blur angle according to the allowable blur angle; the allowable blur angle is used to indicate an acceptable maximum suppression blur angle;

The target exposure time slot is set, and the target exposure time gear is the exposure time slot corresponding to the target suppression blur angle.
The method of claim 1 wherein

Before determining the suppression ratio set according to the currently acquired jitter parameter, the method further includes: acquiring a suppression ratio list; the suppression ratio list includes, under different jitter parameters, respective suppression ratios of the N exposure time slots The value of the suppression ratio in the suppression ratio list is calculated as a function of the suppression ratio with respect to the theoretical blur angle and the suppression blur angle, based on the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle;

Determining the suppression ratio set according to the currently obtained jitter parameter, including:

Querying the suppression ratio list according to the jitter parameter, determining, according to the currently obtained jitter parameter, a suppression ratio corresponding to each of the N exposure time slots, and obtaining the suppression ratio set.
The method according to claim 1 or 2, wherein said obtaining the jitter parameter comprises: obtaining a jitter amplitude and a jitter period of said camera device during photographing.
The method according to claim 3, wherein the predicting a theoretical blur angle corresponding to each of the N exposure time slots according to the jitter parameter comprises:

Constructing a fuzzy angle function based on jitter amplitude and jitter period
among them,
For the blur angle, t is the exposure start time point, Δt is the exposure time length, A is the jitter amplitude, and λ is the jitter period;

Calculating a theoretical blur angle corresponding to each of the N exposure time slots according to the blur angle function, to obtain the theoretical blur angle set.
The method according to claim 4, wherein the calculating a theoretical blur angle corresponding to each of the N exposure time slots according to the blur angle function comprises:

Calculating a theoretical blur angle corresponding to each of the N exposure time slots according to the first formula, the first formula is:

Where ψ_i is the theoretical blur angle corresponding to the i-th exposure time slot, i=1,...N, Δt_i is the exposure duration corresponding to the i-th exposure time slot, and λ is the jitter period;

Or calculating a theoretical blur angle corresponding to each of the N exposure time slots according to the second formula, where the second formula is:

Where t_j(j=1, . . . P) is a P sample value for the exposure start time point t in one jitter period, k is an integer greater than or equal to 0, and P is an integer greater than 1.
The method according to any one of claims 1 to 5, wherein the selecting one of the suppression blur angles from the set of suppression blur angles as the target suppression blur angle according to the allowable blur angle comprises:

A suppression blur angle smaller than or close to the allowable blur angle is selected from the set of suppression blur angles as a target suppression blur angle.
The method according to claim 6, wherein selecting a less than or close to allowable blur angle suppression blur angle from the set of suppression blur angles as the target suppression blur angle comprises:

When at least one of the respective suppression blur angles of the N exposure time slots is not greater than the allowable blur angle, selecting one of the suppression exposure blur angles that is not longer than the allowable blur angle is the longest one. The blur angle is the target suppression blur angle;

When the respective suppression blur angles of the N exposure time slots are greater than the allowable blur angle, selecting the smallest suppression blur angle from the respective suppression blur angles of the N exposure time slots as the target suppression blur angle.
Method according to any of claims 1-7, characterized in that

The suppression ratio is a function of the theoretical blur angle and the suppression blur angle:

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle.
A method according to any one of claims 4-7, wherein

The method further includes: acquiring a photographing instruction of the user;

After the target exposure time slot is set, the method further includes: according to a time point when the camera instruction is received, and the blur angle function
Determining the value t_0 of the exposure start time point t; the blur angle function
There is a minimum value at the point of (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure time slot.
A device for setting an exposure duration for setting a target exposure time slot of a camera device, the camera device providing N exposure time slots, and an exposure time slot corresponding to an exposure duration, wherein N is greater than 1 An integer, characterized in that the device comprises:

An acquisition unit, configured to acquire a jitter parameter, the jitter parameter is used to indicate a jitter state of the camera device during a photographing process;

a processing unit, configured to predict a theoretical blur angle set according to a jitter parameter currently acquired by the acquiring unit; the theoretical blur angle set includes a theoretical blur angle corresponding to each of the N exposure time slots, and the theoretical blur angle is a jitter compensation The expected value of the blur angle in the case where the function is turned off, and the blur angle is the cumulative change amount of the shake angle of the lens during the exposure process;

The processing unit is further configured to determine, according to the jitter parameter currently acquired by the acquiring unit, a suppression ratio set; the suppression ratio set includes a suppression ratio corresponding to each of the N exposure time slots according to the currently acquired jitter parameter The suppression ratio is a function of the theoretical blur angle and the suppression blur angle, and the suppression blur angle is an expected value of the blur angle in the case where the shake compensation function is turned on;

The processing unit is further configured to: according to the theoretical blur angle set and the suppression ratio set, predict a suppression blur angle set according to a suppression ratio function of a theoretical blur angle and a suppression blur angle; the suppression blur angle set is included in Under the currently obtained jitter parameter, each of the N exposure time slots has a corresponding suppression blur angle;

The obtaining unit is further configured to acquire an allowable blur angle;

The processing unit is further configured to select one of the suppression blur angles as the target suppression blur angle according to the allowable blur angle acquired by the acquiring unit; the allowable blur angle is used to indicate that the blur angle is acceptable Maximum suppression of blur angles;

The setting unit is further configured to set a target exposure time slot according to the target suppression blur angle determined by the processing unit, where the target exposure time gear is an exposure time slot corresponding to the target suppression blur angle.
The apparatus for setting an exposure time period according to claim 10, wherein

The obtaining unit is further configured to obtain a suppression ratio list, where the suppression ratio list includes respective suppression ratios of the N exposure time slots according to different jitter parameters; and the suppression ratio in the suppression ratio list Calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the suppression ratio with respect to the theoretical blur angle and the suppression blur angle;

The processing unit is further configured to query, according to the jitter parameter, the obtained by the acquiring unit Taking the suppression ratio list, determining a suppression ratio corresponding to each of the N exposure time slots under the currently acquired jitter parameter, and obtaining the suppression ratio set.
The apparatus for setting an exposure time period according to claim 10 or 11, wherein

The acquiring unit is specifically configured to acquire a jitter amplitude and a jitter period of the camera device during photographing.
The apparatus for setting an exposure time period according to claim 12, wherein

The processing unit is specifically configured to construct a blur angle function according to the jitter amplitude and the jitter period
among them,
For the blur angle, t is the exposure start time point, Δt is the exposure time length, A is the jitter amplitude, and λ is the jitter period; and the theoretical blur angle corresponding to each of the N exposure time slots is calculated according to the blur angle function, The theoretical blur angle set.
The apparatus for setting an exposure time period according to claim 13, wherein

The processing unit is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the first formula, where the first formula is:

Where ψ_i is the theoretical blur angle corresponding to the i-th exposure time slot, i=1,...N, Δt_i is the exposure duration corresponding to the i-th exposure time slot, and λ is the jitter period;

Alternatively, the processing unit is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the second formula, where the second formula is:

Where t_j(j=1, . . . P) is a P sample value for the exposure start time point t in one jitter period, k is an integer greater than or equal to 0, and P is an integer greater than 1.
The apparatus for setting an exposure time length according to any one of claims 10 to 14, wherein

The processing unit is specifically configured to select less than or from the set of suppression blur angles The suppression blur angle close to the allowable blur angle serves as a target suppression blur angle.
The apparatus for setting an exposure time period according to claim 15, wherein

The processing unit is further configured to select from a suppression blur angle that is not greater than the allowable blur angle when at least one of the respective suppression blur angles of the N exposure time slots is not greater than the allowable blur angle The suppression blur angle corresponding to the longest exposure time is the target suppression blur angle;

The processing unit is further configured to select a minimum of each of the suppression blur angles corresponding to each of the N exposure time slots when the respective suppression blur angles of the N exposure time slots are greater than the allowable blur angle The suppression of the blur angle is the target suppression blur angle.
The apparatus for setting an exposure time period according to any one of claims 10 to 16, wherein

The processing unit is specifically configured to predict a set of suppression blur angles according to a function of a blur angle;

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle.
The apparatus for setting an exposure duration according to any one of claims 13 to 16, characterized in that

The obtaining unit is further configured to acquire a photographing instruction of the user;

The processing unit is further configured to, after setting a target exposure time slot position, according to a time point when the photographing instruction is received, and the blur angle function
Determining the value t_0 of the exposure start time point t; the blur angle function
There is a minimum value at the point of (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure time slot.
A device for setting an exposure duration for setting a target exposure time slot of a camera device, the camera device providing N exposure time slots, and an exposure time slot corresponding to an exposure duration, wherein N is greater than 1 An integer, characterized in that the apparatus comprises: a processor, a memory, a bus, and a transceiver; the processor, the memory, and the receiver are connected to each other through the bus;

The receiver is configured to acquire a jitter parameter, the jitter parameter is used to indicate a jitter state of the camera device during a photographing process;

The processor is configured to predict a theoretical blur angle set according to the jitter parameter currently acquired by the receiver; the theoretical blur angle set includes a theoretical blur angle corresponding to each of the N exposure time slots, and the theoretical blur angle is The expected value of the blur angle in the case where the shake compensation function is turned off, and the blur angle is the cumulative change amount of the shake angle of the lens during the exposure process;

The processor is further configured to determine, according to the jitter parameter currently acquired by the receiver, a suppression ratio set; the suppression ratio set includes a suppression ratio corresponding to each of the N exposure time slots according to the currently acquired jitter parameter The suppression ratio is a function of the theoretical blur angle and the suppression blur angle, and the suppression blur angle is an expected value of the blur angle in the case where the shake compensation function is turned on;

The processor is further configured to: according to the theoretical blur angle set and the suppression ratio set, predict a suppression blur angle set according to a suppression ratio function of a theoretical blur angle and a suppression blur angle; the suppression blur angle set is included in Under the currently obtained jitter parameter, each of the N exposure time slots has a corresponding suppression blur angle;

The receiver is further configured to obtain an allowable blur angle;

The processor is further configured to select one of the suppression blur angles as the target suppression blur angle according to the allowable blur angle acquired by the receiver; the allowable blur angle is used to indicate that the blur angle is acceptable Maximum suppression of blur angles;

The processor is further configured to set a target exposure time slot according to the target suppression blur angle, where the target exposure time gear is an exposure time slot corresponding to the target suppression blur angle.
The apparatus for setting an exposure time period according to claim 19, wherein

The receiver is further configured to obtain a suppression ratio list; the suppression ratio list includes a suppression ratio corresponding to each of the N exposure time slots according to different jitter parameters; and a value of a suppression ratio in the suppression ratio list Calculated according to the experimental value of the theoretical blur angle and the experimental value of the suppression blur angle according to the suppression ratio with respect to the theoretical blur angle and the suppression blur angle;

The processor is further configured to query the suppression ratio list acquired by the receiver according to the jitter parameter, and determine, according to the currently obtained jitter parameter, the N exposure durations The respective suppression ratios of the gear positions are obtained, and the suppression ratio set is obtained.
The apparatus for setting an exposure time period according to claim 19 or 20, characterized in that

The receiver is specifically configured to acquire a jitter amplitude and a jitter period of the camera device during photographing.
The apparatus for setting an exposure time period according to claim 21, wherein

The processor is specifically configured to construct a blur angle function according to the jitter amplitude and the jitter period
among them,
For the blur angle, t is the exposure start time point, Δt is the exposure time length, A is the jitter amplitude, and λ is the jitter period; and the theoretical blur angle corresponding to each of the N exposure time slots is calculated according to the blur angle function, The theoretical blur angle set.
The apparatus for setting an exposure time period according to claim 22, wherein

The processor is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the first formula, where the first formula is:

Where ψ_i is the theoretical blur angle corresponding to the i-th exposure time slot, i=1,...N, Δt_i is the exposure duration corresponding to the i-th exposure time slot, and λ is the jitter period;

Alternatively, the processor is further configured to calculate a theoretical blur angle corresponding to each of the N exposure time slots according to the second formula, where the second formula is:

Where t_j(j=1, . . . P) is a P sample value for the exposure start time point t in one jitter period, k is an integer greater than or equal to 0, and P is an integer greater than 1.
The apparatus for setting an exposure time period according to any one of claims 19 to 23, characterized in that

The processor is specifically configured to select, as the target suppression blur angle, a suppression blur angle that is less than or close to the allowable blur angle from the set of suppression blur angles.
The apparatus for setting an exposure time period according to claim 24, wherein

The processor is further configured to select from a suppression blur angle that is not greater than the allowable blur angle when at least one of the respective suppression blur angles of the N exposure time slots is not greater than the allowable blur angle The suppression blur angle corresponding to the longest exposure time is the target suppression blur angle;

The processor is further configured to select a minimum of each of the suppression blur angles corresponding to each of the N exposure time slots when the respective suppression blur angles of the N exposure time slots are greater than the allowable blur angle The suppression of the blur angle is the target suppression blur angle.
The apparatus for setting an exposure time period according to any one of claims 19 to 25, characterized in that

The processor is specifically configured to predict a set of suppression blur angles according to a function of a blur angle;

Among them, DB is the suppression ratio, ψ is the theoretical blur angle, and ψ_ON is the suppression blur angle.
The apparatus for setting an exposure time period according to any one of claims 22 to 25, characterized in that

The receiver is further configured to acquire a photographing instruction of the user;

The processor is further configured to: after setting a target exposure time slot, according to a time point when the photographing instruction is received, and the blur angle function
Determining the value t_0 of the exposure start time point t; the blur angle function
There is a minimum value at the point of (t=t_0, Δt=Δt_0, A, λ), where Δt_0 is the exposure duration corresponding to the target exposure time slot.
A computer readable storage medium, characterized in that the computer readable storage medium stores program code, when the program code is executed, implementing the set exposure time length according to any one of claims 1-9 method.
A photographic apparatus comprising the apparatus for setting an exposure time period according to any one of claims 10-27.