WO2017177407A1 - Procédé et appareil de réglage de durée d'exposition, et dispositif photographique - Google Patents

Procédé et appareil de réglage de durée d'exposition, et dispositif photographique Download PDF

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Publication number
WO2017177407A1
WO2017177407A1 PCT/CN2016/079215 CN2016079215W WO2017177407A1 WO 2017177407 A1 WO2017177407 A1 WO 2017177407A1 CN 2016079215 W CN2016079215 W CN 2016079215W WO 2017177407 A1 WO2017177407 A1 WO 2017177407A1
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WIPO (PCT)
Prior art keywords
suppression
blur angle
blur
exposure time
angle
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PCT/CN2016/079215
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English (en)
Chinese (zh)
Inventor
李付生
胡毅超
贾飞
徐荣跃
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华为技术有限公司
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Priority to CN201680009557.9A priority Critical patent/CN107493686B/zh
Priority to PCT/CN2016/079215 priority patent/WO2017177407A1/fr
Publication of WO2017177407A1 publication Critical patent/WO2017177407A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/091—Digital circuits
    • G03B7/093—Digital circuits for control of exposure time

Definitions

  • 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.
  • optical image stabilizer English full name: Optical Image Stabilization (English abbreviation: OIS) performs jitter compensation to suppress the effects of jitter on imaging.
  • 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.
  • the amount of jitter compensation is different, and the sharpness of the photograph is different.
  • 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.
  • 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.
  • a method for setting an exposure duration 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:
  • 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.
  • 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.
  • 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.
  • the jitter amplitude and the jitter period are used as the jitter parameters.
  • the value of the theoretical blur angle varies with the exposure start time point t and the exposure time length ⁇ t, thus constructing a blur angle function, that is, a blur angle Regarding the functions of t, ⁇ t, A, and ⁇ , 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 ⁇ t on the blur angle is further considered. .
  • one The theoretical blur angle corresponding to the exposure time slot is: when the exposure time length ⁇ t is the exposure time corresponding to the exposure time slot, the integration and jitter of the blur angle function in the one jitter period ⁇ with respect to the exposure start time point t The ratio of the period ⁇ . Since the fuzzy angle function is a periodic function, the ratio of the integral of the blur angle function within one jitter period ⁇ to the jitter period ⁇ reflects the average level of the theoretical blur angle.
  • the theoretical blur angle corresponding to an exposure time slot is when the exposure time length ⁇ t 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 ⁇ . 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 ⁇ also reflects the average level of the theoretical blur angle.
  • a device for setting an exposure duration for implementing the method of setting an exposure duration provided by the first aspect.
  • 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.
  • a 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.
  • a photographic apparatus comprising the apparatus for setting an exposure duration provided by the second aspect or the third aspect.
  • FIG. 1 is a schematic flow chart of a method for setting an exposure time length according to an embodiment of the present invention
  • FIG. 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.
  • FIG. 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.
  • 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. 15 is a schematic diagram showing another calculation manner of the allowable blur angle in the embodiment of the present invention.
  • 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.
  • 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.
  • 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.
  • 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.
  • N is an integer greater than one.
  • the number of exposure time slots is 8, and the corresponding exposure time is from 1/2 second to 1/32 second.
  • 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.
  • the camera can set the target exposure time slot according to its actual jitter condition to obtain a better-resolution photo.
  • 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:
  • 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.
  • 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, ⁇ 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.
  • 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.
  • 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.
  • 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.
  • the jitter amplitude and jitter period are determined based on the bandpass filtered digital signal.
  • the photographing instruction is used to instruct the photographing device to start the photographing process.
  • 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.
  • step 101 is in the previous step 102. is behind.
  • the camera device is a smartphone, and when the user opens the camera application, the camera device begins sampling the jitter parameters.
  • step 102 is preceded by the previous step 101.
  • 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.
  • 3 is a schematic diagram showing the blur angle, the exposure time is ⁇ t, 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 ⁇ t, 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.
  • the jitter angle y monotonically increases during the exposure process.
  • the size of the rectangle is 301,
  • 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.
  • the lens shake angle reaches a maximum value (jitter amplitude) at time t_3, and (t_3-t_2) ⁇ ⁇ t.
  • the amount of change in the lens shake angle is the height of the rectangle 302.
  • 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.
  • 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.
  • 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.
  • the trajectory of the lens shake angle during the exposure may sweep the maximum twice.
  • the value is 2A.
  • the width of the rectangle 401 in FIG. 4 is larger than the jitter period ⁇ and the height is 2A.
  • 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.
  • 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 ⁇ t is the exposure time length.
  • a and ⁇ 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
  • 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+ ⁇ 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.
  • 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+ ⁇ /2 is the exposure start time point.
  • the blur angle function is a periodic function with respect to t in the period of ⁇ /2
  • an embodiment of the present invention will be described with one cycle. Specifically, taking the case of the interval t ⁇ [0, ⁇ /2] as an example, the specific expression of the jitter wave function is explained:
  • the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 602.
  • the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 603.
  • the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 604.
  • the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 702.
  • the change track of the lens shake angle during the exposure is a portion within the width of the rectangle 703.
  • the change angle of the lens shake angle during the exposure is a portion within the width of the rectangle 803.
  • the change track of the lens shake angle during the exposure is a portion within the width of the rectangle 901.
  • 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.
  • 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 is the expected value of the blur angle, so the theoretical blur angle can be calculated according to the blur angle.
  • the fuzzy angle function For a periodic function with respect to t with a period of ⁇ /2, the expected value of the blur angle may be an average value of the blur angle in one cycle.
  • 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.
  • the embodiment of the present invention provides two specific calculation manners, which are respectively described as follows:
  • the theoretical blur angle function is the quotient of the integral of the fuzzy angle function in the interval t ⁇ [k ⁇ ,(k+1) ⁇ ] and the length ⁇ of the integral interval, and k is an integer greater than or equal to 0.
  • the integral interval length ⁇ is twice the period of the blur angle function ⁇ /2, so the theoretical blur angle is the expected value of the blur angle in two periods.
  • the theoretical blur angle corresponding to each of the N exposure time slots is calculated by the first formula, and the first formula is:
  • the sampling interval is [k ⁇ , (k+1) ⁇ ), 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 [k ⁇ , (k+1) ⁇ ).
  • the length ⁇ of the sampling interval is twice the period of the blur angle function ⁇ /2, so the theoretical blur angle is the expected value of the blur angle in two periods.
  • the theoretical blur angle corresponding to each of the N exposure time slots is calculated by the second formula, and the second formula is:
  • each of the N exposure time slots corresponds to a theoretical blur angle.
  • 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.
  • 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.
  • the suppression ratio is a function of a theoretical blur angle and a suppression blur angle:
  • DB is the suppression ratio
  • ⁇ is the theoretical blur angle
  • ⁇ _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.
  • the camera unit is mounted on a dithering station that provides a certain jitter amplitude and jitter period.
  • the theoretical blur angle ⁇ 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.
  • the blur angle and the magnitude of the theoretical blur angle are proportional to the jitter amplitude under the same jitter period.
  • the experimental value of the theoretical blur angle ⁇ as shown in Table 3 is measured at a jitter amplitude of 1°:
  • 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°.
  • the jitter amplitude is 2°
  • the experimental value of the corresponding theoretical blur angle is 1.41° times 2.
  • 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.
  • CIPA Camera & Imaging Products Association
  • 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
  • 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 ⁇ ON, and its size is:
  • 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 ⁇ _ON is obtained:
  • the experimental value of the suppression blur angle ⁇ _ON is calculated according to the final calculation formula of the suppression blur angle ⁇ _ON. For example, when the jitter amplitude is 1°, the suppression of the blur angle ⁇ as shown in Table 4 is measured. Experimental value:
  • multiple sets of experimental values can be measured multiple times, and the experimental values of the final suppressed blur angle ⁇ are obtained by averaging the multiple sets of experimental values.
  • 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 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.
  • 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.
  • the suppression ratio set includes the suppression ratios corresponding to the respective N exposure time slots under the currently acquired jitter parameters.
  • 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.
  • 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.
  • the experimental value of the fuzzy angle ⁇ ON is the experimental value obtained from the experiment.
  • the function of the theoretical blur angle and the suppression blur angle: ⁇ _ON_i can be derived by ⁇ _i and DB_i by the above function relation.
  • the allowable blur angle ⁇ _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.
  • an acceptable maximum suppression blur angle which may be a preset value or a value actually calculated by the camera during the photographing process.
  • the angle of the two object points that can be resolved by the human eye to the eye is called the minimum resolvable angle ⁇ of the human eye.
  • the minimum resolvable angle ⁇ of the human eye 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 ⁇ of the human eye.
  • the size of the minimum resolvable angle ⁇ of the human eye depends on the structure of the human eye itself. In the embodiment of the present invention, the minimum resolvable angle ⁇ of the human eye is a preset value, and is usually 1/60°.
  • the minimum resolvable angle ⁇ 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.
  • the preset viewing distance can be 30 cm. Or provide the user with several viewing distances, which are useful for selection.
  • 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.
  • the allowable blur angle can be further calculated.
  • the imaging positions of the subject O on the photosensitive element 1102 are different, the calculation manner of the allowable blur angle ⁇ _max is different, and the following describes different imaging positions.
  • Equation 1 Equation 2, and Equation 3.1, we get:
  • Equation 1 Equation 2, and Equation 3.2, we get:
  • 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 ⁇ _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 ⁇ _max, it means that the sharpness of the photograph is within the acceptable range of the human eye.
  • FIG. 16 a graph showing the variation of the experimental value of the blur angle ⁇ _ON with the exposure time length ⁇ t under a certain jitter parameter.
  • ⁇ t_a to ⁇ t_i are sequentially increased.
  • the suppression blur angle ⁇ ON is first decreased and then increased, and the change trend is U-shaped.
  • the target suppression blur angle ⁇ opt is less than or close to the allowable blur angle ⁇ _max.
  • the suppression blur angle ⁇ _ON corresponding to ⁇ t_c to ⁇ t_g is not greater than the allowable blur angle ⁇ _max, in which case ⁇ t_c to ⁇ t_g
  • the suppression blur angle ⁇ _ON corresponding to any exposure duration can be used as the target suppression blur angle ⁇ _opt.
  • the exposure time is extended as much as possible to increase the exposure amount while ensuring the sharpness of the photograph.
  • the suppression blur is never greater than the allowable blur angle.
  • the exposure time corresponding to ⁇ t_g in ⁇ t_c to ⁇ t_g is the largest as indicated by the arrow in Fig. 17, in which case the corresponding suppression blur angle ⁇ _ON corresponding to ⁇ t_g is selected as the target suppression blur angle.
  • the suppression blur corresponding to the N exposure time slots are larger than the allowable blur angle ⁇ _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 ⁇ opt.
  • the respective suppression blur angles of ⁇ t_a to ⁇ t_i are larger than the allowable blur angle ⁇ _max, and the suppression blur angle corresponding to ⁇ t_d is the smallest, that is, the closest allowable blur angle ⁇ _max.
  • the corresponding suppression blur angle ⁇ _ON corresponding to ⁇ t_d is selected as the target suppression blur angle ⁇ _opt.
  • the target exposure time slot is the exposure time slot corresponding to the target suppression blur angle ⁇ opt.
  • the target suppression blur angle ⁇ opt is the corresponding suppression blur angle ⁇ _ON corresponding to ⁇ t_g
  • the target exposure time shift position is the exposure time shift position corresponding to ⁇ t_g.
  • the target suppression blur angle ⁇ opt is the corresponding suppression blur angle ⁇ _ON corresponding to ⁇ t_d, and then the target exposure time slot is the exposure time slot corresponding to ⁇ t_d.
  • 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.
  • the fuzzy angle function For a periodic function with respect to t with a period of ⁇ /2, there are minimum and maximum values in one cycle.
  • the camera device acquires the jitter amplitude A and the jitter period ⁇ according to the actual jitter condition, and determines the blur angle function.
  • the value of t0 depends on when the camera device acquires the jitter parameter.
  • 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.
  • t1 The value of t1 depends on the time the camera device sets the exposure time.
  • a series of calculations are performed according to the jitter parameter to determine the target suppression blur angle ⁇ _opt, and finally the time required for the target exposure time slot is set, and t0 is obtained to obtain the value of t1.
  • 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.
  • 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 obtained 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the processing unit 202 obtains a suppression ratio set by querying the saved suppression ratio list.
  • 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.
  • the obtaining unit 201 is specifically configured to acquire a jitter amplitude and a jitter period of the camera device during the photographing process.
  • the processing unit 202 is configured to construct a blur angle function according to the jitter amplitude and the jitter period.
  • t is the exposure start time point
  • ⁇ t is the exposure time length
  • A is the jitter amplitude
  • ⁇ 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.
  • 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:
  • 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:
  • k is an integer greater than or equal to
  • P is an integer greater than 1.
  • 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.
  • 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.
  • 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.
  • the processing unit 202 is specifically configured to predict a set of suppression blur angles according to a function of a blur angle:
  • DB is the suppression ratio
  • ⁇ is the theoretical blur angle
  • ⁇ _ON is the suppression blur angle
  • 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 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.
  • 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 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 obtained 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL universal Array logic
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the receiving unit is specifically configured to obtain a jitter amplitude and a jitter period of the camera device during the photographing process.
  • the processor 211 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, ⁇ t is the exposure time length, A is the jitter amplitude, and ⁇ 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.
  • 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:
  • 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:
  • k is an integer greater than or equal to
  • P is an integer greater than 1.
  • 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.
  • 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.
  • 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.
  • the processor 211 is specifically configured to predict a set of suppression blur angles according to a function of a blur angle.
  • DB is the suppression ratio
  • ⁇ is the theoretical blur angle
  • ⁇ _ON is the suppression blur angle
  • 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
  • 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.
  • the camera device includes the means for setting the exposure duration as described in the embodiment corresponding to FIG.
  • 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
  • the suppression blur angle set is obtained according to the suppression ratio set prediction
  • the target suppression blur angle is selected from the suppression blur angle set according to the allowable blur angle
  • 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.
  • 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.
  • the method for setting the exposure duration 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.
  • 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.
  • 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
  • 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.
  • 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.
  • APP application program
  • a method of setting an exposure time length provided by an embodiment of the present invention is achieved.
  • 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 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 stores and transmits program code or instructions for implementing a method of setting an exposure duration.
  • 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.
  • 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.
  • 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 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.

Abstract

La présente invention concerne un procédé et un appareil pour régler une durée d'exposition, et un dispositif photographique, ceux-ci concernant le domaine des produits électroniques et permettant d'améliorer la netteté d'une image. La solution spécifique est : l'acquisition d'un paramètre d'instabilité (101) ; la prédiction d'un ensemble d'angles flous théoriques en fonction du paramètre d'instabilité actuellement acquis (103) ; la détermination d'un ensemble de rapports de rejet en fonction du paramètre d'instabilité actuellement acquis (104) ; en fonction de l'ensemble d'angles flous théoriques et de l'ensemble de rapports de rejet, la prédiction d'un ensemble d'angles flous de rejet sur la base de fonctions d'un rapport de rejet en ce qui concerne un angle flou théorique et un angle flou de rejet (105); l'acquisition d'un angle flou admissible (106), la sélection, en fonction de l'angle flou admissible et de l'ensemble d'angles flous de rejet, d'un angle flou de rejet en tant qu'angle flou de rejet cible (107) ; et le réglage d'un niveau de durée d'exposition cible (108), le niveau de durée d'exposition cible étant l'un d'au moins deux niveaux de durée d'exposition fournis par un dispositif photographique.
PCT/CN2016/079215 2016-04-13 2016-04-13 Procédé et appareil de réglage de durée d'exposition, et dispositif photographique WO2017177407A1 (fr)

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