WO2020181483A1

WO2020181483A1 - Camera control method and apparatus

Info

Publication number: WO2020181483A1
Application number: PCT/CN2019/077789
Authority: WO
Inventors: 俞利富; 梁大奖; 王浩伟
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2019-03-12
Filing date: 2019-03-12
Publication date: 2020-09-17
Also published as: CN111316635B; CN111316635A

Abstract

Disclosed are a camera control method and apparatus. The method comprises: determining, according to a preset target brightness, a first exposure parameter of a camera in a preview mode (101); determining, according to an exposure value corresponding to the first exposure parameter and an exposure adjustment parameter set by a user, a second exposure parameter of the camera in a photographing mode (102); determining, according to the first exposure parameter and the second exposure parameter, a brightness difference value (103); and controlling, according to the brightness difference value, the brightness of an image displayed in the preview mode (104). In the present invention, the brightness of an image displayed in a preview mode can be made consistent with the brightness of an image photographed in a photographing mode.

Description

Camera control method and device

Technical field

The invention relates to the field of cameras, in particular to a camera control method and device.

Background technique

With the development of society, the application of cameras has become more and more extensive. For example, mobile phones, computers, drones and other devices can be equipped with cameras for image collection.

In the prior art, when the camera works in the semi-automatic mode, the user can adjust some of the camera's exposure parameters. Specifically, in the preview mode, the camera can select a set of exposure parameters that are not related to the part of the exposure parameters adjusted by the user according to the target brightness of the image (ie, exposure parameter 1) for presenting the image. However, in the shooting mode, in order to make the brightness of the image obtained in the shooting mode consistent with the image presented in the preview mode, that is, the brightness of the image presented in the preview mode is the brightness of the image obtained in the shooting mode, the camera can adjust the adjustment according to the user Part of the exposure parameters and the exposure value corresponding to the exposure parameter 1, adjust other exposure parameters to obtain the exposure parameter 2, and use the exposure parameter 2 to take an image.

However, in the prior art, there is a problem that the exposure parameters used in the shooting mode cannot make the image obtained in the shooting mode consistent with the brightness of the image presented in the preview mode due to the unreasonable adjustment of some exposure parameters by the user, that is, The brightness of the image obtained in the shooting mode and the image presented in the preview mode are not consistent.

Summary of the invention

The embodiments of the present invention provide a camera control method and device, which are used to solve the problem that the exposure parameters used in the shooting mode cannot make the image obtained in the shooting mode due to the unreasonable adjustment of some exposure parameters by the user in the prior art. The problem is consistent with the brightness of the image presented in the preview mode.

In a first aspect, an embodiment of the present invention provides a camera control method, including:

Determine the first exposure parameter of the camera in preview mode according to the preset target brightness;

Determining the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user;

Determine a brightness difference value according to the first exposure parameter and the second exposure parameter;

According to the brightness difference value, the brightness of the image presented in the preview mode is controlled.

In a second aspect, an embodiment of the present invention provides a camera control device, including: a processor and a memory;

The memory is used to store program code;

The processor calls the program code, and when the program code is executed, is used to perform the following operations:

In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, the computer program includes at least one piece of code, the at least one piece of code can be executed by a computer to control all The computer executes the camera control method according to any one of the above-mentioned first aspects.

In a fourth aspect, an embodiment of the present invention provides a computer program, when the computer program is executed by a computer, it is used to implement the camera control method according to any one of the foregoing first aspects.

The camera control method and device provided by the embodiments of the present invention determine the first exposure parameter of the camera in preview mode according to the preset target brightness, and according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user, Determine the second exposure parameter of the camera in the shooting mode, determine the brightness difference value according to the first exposure parameter and the second exposure parameter, and control the brightness of the image presented in the preview mode according to the brightness difference value, due to the brightness difference value It can characterize the difference between the brightness of the image presented in the preview mode according to the first exposure parameter and the brightness of the image taken in the shooting mode according to the second exposure parameter, so according to the brightness difference value, control the difference in the preview mode The brightness of the presented image can make the brightness of the image presented in the preview mode consistent with the brightness of the image captured in the shooting mode, avoiding the unreasonable adjustment of some exposure parameters by the user, which may lead to the use in the shooting mode The problem that the brightness of the image obtained in the shooting mode cannot be consistent with the brightness of the image presented in the preview mode is caused by the exposure parameters of the camera, so that the user can know the impact on the brightness of the image after the adjustment of some exposure parameters through the image presented in the preview mode. Improve the user experience.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic flowchart of a camera control method provided by an embodiment of the present invention;

2 is a schematic flowchart of a camera control method provided by another embodiment of the present invention;

3 is a schematic diagram of the processing sequence of various stages provided by an embodiment of the present invention;

4 is a schematic flowchart of a camera control method provided by another embodiment of the present invention;

FIG. 5 is a schematic diagram of a gamma line provided by an embodiment of the present invention;

6 is a schematic flowchart of a camera control method according to another embodiment of the present invention;

Fig. 7 is a camera control device provided by an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The camera control method provided by the embodiments of the present invention can be applied to any device capable of implementing camera functions. It should be noted that the present invention may not limit the specific form of the device that realizes the camera function. Optionally, the device that implements the camera function may specifically be a camera, a mobile phone that implements the camera function, a tablet computer that implements the camera function, a pan-tilt camera, and a drone that implements the camera function.

The camera control method provided in this embodiment may be executed by a camera control device, specifically, it may be executed by a processor of the camera control device. Wherein, the camera control device may be part or all of a device that implements camera functions through software and/or hardware.

Among them, the camera may include a preview mode and a shooting mode. The camera in the preview mode means that the camera can present the image in the current shooting range, but it does not store the presented image as a photo or video. In the preview mode, the user can learn the current images that can be saved by the camera as photos or videos, and input shooting instructions. Further, after the user inputs a shooting instruction, the camera can switch from the preview mode to the shooting mode, and in the shooting mode, the image in the current shooting range is stored as a photo or video.

For the semi-automatic mode, within the normal exposure range, the brightness of the image presented in the preview mode and the image captured in the shooting mode can be kept consistent, but the exposure value corresponding to the exposure parameter in the shooting mode exceeds the exposure range of the preview mode (Hereinafter, referred to as special cases), there are inconsistencies. Here, the semi-automatic mode may refer to a mode that allows the user to adjust part of the camera's exposure parameters. Exemplarily, the semi-automatic gear mode of the camera may include: aperture priority mode (abbreviated as A file), the user adjusts the aperture size and sensitivity, and then the camera automatically meters the shutter time; shutter priority mode (abbreviated as S file), use The user adjusts the shutter time and sensitivity, and then the camera automatically meters the aperture size; in the program automatic mode (referred to as P file), the user adjusts the sensitivity, and the aperture and shutter are determined by the camera's automatic metering system.

Taking S file as an example, assuming that when S file is used to take a picture, the exposure parameters of the shooting mode used for normal exposure are: the aperture (ie, F) value is 2.8, the shutter time is 1/20 second, and the light sensitivity ordinance, ISO ) Is 800, but the user adjusts the shutter time according to his own preferences at this time, and the adjusted shutter time is 4 seconds, because the user increases the shutter time, the longer the exposure time, the more light enters the camera. Therefore, according to the brightness value (LV) obtained by the metering in the preview mode, the camera will reduce the aperture and ISO to compensate for the upward adjustment of the shutter time. If the aperture is reduced to the minimum value of 10, and the ISO is reduced to The minimum value is 100, but still cannot compensate for the increase in the shutter time, the photos taken in the shooting mode are still overexposed. Therefore, there is a problem that the image presented in the preview mode is normally exposed, but the image taken in the shooting mode is overexposed, and the brightness of the two is inconsistent.

Taking the S file as an example, assuming that the S file is used to take pictures, the exposure parameters of the shooting mode used for normal exposure are: F value is 2.8, shutter time is 2 seconds, and ISO is 800. However, the user can adjust the shutter speed according to his own preferences. Adjust the time, and the adjusted shutter time is 1/20 second, then because the user adjusts the shutter time to a shorter time, the shorter the exposure time, the less light enters the camera. Therefore, according to the LV obtained by metering in the preview mode, the camera is To compensate for the decrease in the shutter time, the aperture and ISO will be increased. If the aperture and ISO are adjusted to the maximum value, but still cannot compensate for the decrease in the shutter time, the photos taken in shooting mode are still underexposed. Therefore, there is a problem that the image presented in the preview mode is normally exposed, but the image taken in the shooting mode is underexposed, and the brightness of the two is inconsistent.

Take the P file as an example. If you use the P file to take pictures, the exposure parameters of the shooting mode used for normal exposure are: F value is 2.8, shutter time is 2 seconds, and ISO is 800. However, the user now chooses ISO according to his own preferences. Will be adjusted, and the adjusted ISO is 100, because the user adjusts the ISO to lower the exposure per unit time, so according to the LV obtained by the metering in the preview mode, the camera will adjust the aperture and shutter Increase the time. If the aperture and shutter time are adjusted to the maximum value, but still cannot compensate for the reduction in ISO, the photos taken in shooting mode are still underexposed. Therefore, there is a problem that the image presented in the preview mode is normally exposed, but the image taken in the shooting mode is underexposed, and the brightness of the two is inconsistent.

It is understandable that in the semi-automatic shooting mode, when the user adjusts some exposure parameters unreasonably, the camera's adjustment of other exposure parameters except this part of the exposure parameters cannot compensate for the adjustment range of this part of the exposure parameters ( That is, under special circumstances), the exposure of the image presented in the preview mode is normal, while the image captured in the shooting mode is under-exposed or over-exposed, and the brightness of the two is inconsistent, so I will not list them one by one here.

In the embodiment of the present invention, by controlling the brightness of the image presented in the preview mode, the brightness of the image presented in the preview mode and the image captured in the shooting mode can be kept consistent in the semi-automatic gear mode for special circumstances.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

FIG. 1 is a schematic flowchart of a camera control method provided by an embodiment of the present invention. The execution subject of this embodiment may be a camera control device, and specifically may be a processor of the camera control device. As shown in Figure 1, the method of this embodiment may include:

Step 101: Determine the first exposure parameter of the camera in the preview mode according to the preset target brightness.

In this step, the target brightness can also be referred to as the calibration exposure value. The target brightness can be understood as the desired image brightness. Here, the target brightness may be related to the shooting scene, that is, the target brightness may be determined according to the current shooting scene. Exemplarily, the shooting scene may include one or more of environmental brightness, shooting weather, shooting time, and shooting location. For example, the shooting weather in the current shooting scene is sunny, the shooting time is noon, and the shooting location is outdoor, the target brightness can be brightness 1. In the current shooting scene, the shooting weather is cloudy, the shooting time is evening, and the shooting location is outdoor The target brightness can be brightness 2, and brightness 1 can be greater than brightness 2. It should be noted that the method of determining the target brightness may not be limited in the present invention.

Exemplarily, the first exposure parameter of the camera in the preview mode may be determined according to the preset target brightness and an automatic exposure algorithm (Auto Exposure, AE). Optionally, the exposure value can be determined by an automatic exposure algorithm, the camera's exposure value can be determined according to the difference between the exposure value determined by the automatic exposure algorithm and the target brightness, and the exposure parameter combination can be determined according to the camera's exposure value (ie, the first exposure parameter). It should be noted that the specific manner in which the camera determines the first exposure parameter according to the preset target brightness in the preview mode may not be limited in the present invention.

Step 102: Determine the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user.

In this step, the exposure value corresponding to the first exposure parameter can be understood as the exposure value that can be obtained according to the first exposure parameter, and specifically can be the exposure value of the camera used to determine the first exposure parameter. The exposure parameter adjusted by the user may be a part of the exposure parameters of the camera, for example, may be the shutter in aperture, shutter, and sensitivity.

Exemplarily, according to the second exposure parameter including the user-adjusted exposure parameter, all exposure parameters of the camera other than the user-adjusted exposure parameter may be adjusted so that the second exposure parameter The exposure value corresponding to the exposure parameter reaches the exposure value corresponding to the first exposure parameter as much as possible, and other exposure parameters in the second exposure parameter are determined to obtain the second exposure parameter. It is understandable that the second exposure parameter includes the exposure parameter adjusted by the user and the other determined exposure parameter. It should be noted that the specific manner of the second exposure parameter of the camera in the shooting mode determined according to the exposure value corresponding to the first exposure parameter and the exposure parameter adjusted by the user may not be limited in the present invention.

Wherein, the second exposure parameter may be, for example, F value of 10, shutter time of 4 seconds, and ISO of 100. It should be noted that, in the embodiment of the present invention, the shutter may include shutter time or shutter speed.

Step 103: Determine a brightness difference value according to the first exposure parameter and the second exposure parameter.

In this step, the brightness difference value may represent the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter, and any specific method for determining the brightness difference value that can characterize the difference , All belong to the protection scope of the embodiments of the present invention. Optionally, the brightness difference value may be equal to the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter (ie, the exposure value corresponding to the first exposure parameter minus the second exposure The result obtained by the exposure value corresponding to the parameter), at this time, when the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the brightness difference value may be less than 0; When the exposure value corresponding to the second exposure parameter is under-exposed compared to the exposure value corresponding to the first exposure parameter, the brightness difference value may be greater than 0; or, the brightness difference value may be equal to the second exposure parameter corresponding The difference between the exposure value of and the exposure value corresponding to the first exposure parameter (that is, the result of subtracting the exposure value corresponding to the first exposure parameter from the exposure value corresponding to the second exposure parameter). When the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the brightness difference value may be greater than 0; when the exposure value corresponding to the second exposure parameter corresponds to the first exposure parameter When the exposure value of is under-exposed, the brightness difference value can be less than 0.

It is understandable that when the user adjusts part of the exposure parameters reasonably, the camera can adjust the exposure parameters other than this part of the exposure parameters to compensate the adjustment range of the part of the exposure parameters (ie, in non-extreme scenes), so The brightness difference value may be equal to 0, or may be less than or equal to a certain threshold. When the user adjusts part of the exposure parameters unreasonably, the camera's adjustment of other exposure parameters other than this part of the exposure parameters cannot compensate for the adjustment range of the part of the exposure parameters (ie, in extreme scenes), and the brightness difference value may be Greater than the certain threshold, and the greater the degree of unreasonable adjustment of some exposure parameters by the user, the greater the brightness difference value.

Step 104: Control the brightness of the image presented in the preview mode according to the brightness difference value.

In this step, since the brightness difference value can represent the brightness of the image presented in the preview mode according to the first exposure parameter and the brightness of the image captured in the shooting mode according to the second exposure parameter. Therefore, according to the brightness difference value, controlling the brightness of the image presented in the preview mode can make the brightness of the image presented in the preview mode consistent with the brightness of the image captured in the shooting mode.

Here, the brightness of the image presented in the preview mode is consistent with the brightness of the image captured in the shooting mode can be understood as: the brightness of the image presented in the preview mode is the same as the brightness of the image captured in the shooting mode Or, the difference (for example, the absolute value of the difference) between the brightness of the image presented in the preview mode and the brightness of the image captured in the shooting mode is less than or equal to a certain threshold.

For an example of a specific method of controlling the brightness of the image presented in the preview mode according to the brightness difference value, reference may be made to the related description in the embodiments shown in FIGS. 2 to 6 below. It should be noted that any specific method for controlling the brightness of the image presented in the preview mode according to the brightness difference value so that the brightness of the image presented in the preview mode is consistent with the brightness of the image captured in the shooting mode , All belong to the protection scope of the embodiments of the present invention.

The camera control method provided by this embodiment determines the camera's first exposure parameter in the preview mode according to the preset target brightness, and determines the camera's position according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user. The second exposure parameter in the shooting mode determines the brightness difference value according to the first exposure parameter and the second exposure parameter, and controls the brightness of the image presented in the preview mode according to the brightness difference value, because the brightness difference value can be characterized according to The difference between the brightness of the image presented by the first exposure parameter in the preview mode and the brightness of the image taken in the shooting mode according to the second exposure parameter, so according to the brightness difference value, the image presented in the preview mode is controlled The brightness can make the brightness of the image presented in the preview mode consistent with the brightness of the image captured in the shooting mode, avoiding the exposure parameters used in the shooting mode due to the unreasonable adjustment of some exposure parameters by the user , The problem that the brightness of the image obtained in the shooting mode cannot be consistent with the brightness of the image presented in the preview mode allows the user to know the impact on the brightness of the image after the adjustment of some exposure parameters through the image presented in the preview mode, which improves the user Experience.

FIG. 2 is a schematic flowchart of a camera control method provided by another embodiment of the present invention. On the basis of the embodiment shown in FIG. 1, this embodiment mainly describes an optional implementation manner of controlling the brightness of the image presented in the preview mode according to the brightness difference value. As shown in Figure 2, the method of this embodiment may include:

Step 201: Determine the first exposure parameter of the camera in the preview mode according to the preset target brightness.

It should be noted that step 201 is similar to step 101 and will not be repeated here.

Step 202: Determine the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user.

It should be noted that step 202 is similar to step 102 and will not be repeated here.

Step 203: Determine a brightness difference value according to the first exposure parameter and the second exposure parameter.

It should be noted that step 203 is similar to step 103 and will not be repeated here.

Step 204: Determine a digital gain value according to the brightness difference value.

In this step, the digital gain value (Dgain) can be used to control the sensitivity, that is, the digital gain value can be used as a control parameter of the sensitivity. In addition to the digital gain value, the analog gain value (Again) can also be used as a sensitivity control parameter.

Specifically, according to the greater the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter, the brightness value of the image may be determined before the image is presented in the preview mode. The greater the adjustment range, and the smaller the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter, the smaller the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter. The smaller the magnitude of the brightness value is adjusted, the first adjustment target determines the digital gain value.

Exemplarily, assuming that the brightness difference value is equal to the difference between the exposure value corresponding to the second exposure parameter and the exposure value corresponding to the first exposure parameter, when the brightness difference value is greater than 0, the digital gain The value may be greater than 1, and the digital gain value may be positively correlated with the brightness difference value; when the brightness difference value is less than 0, the digital gain value may be less than 1, and the digital gain value and the brightness The absolute value of the difference value is negatively correlated.

Exemplarily, assuming that the brightness difference value is equal to the difference between the exposure value corresponding to the first exposure parameter and the exposure value corresponding to the second exposure parameter, when the brightness difference value is greater than 0, the digital gain The value may be less than 1, and the digital gain value may be negatively correlated with the brightness difference value; when the brightness difference value is less than 0, the digital gain value may be greater than 1, and the digital gain value and the brightness The absolute value of the difference value is positively correlated.

It should be noted that the specific method for determining the digital gain value according to the brightness difference value may not be limited in the embodiment of the present invention. Any specific method for determining the digital gain value that satisfies the first adjustment target mentioned above belongs to the protection scope of the present invention. . Optionally, step 204 may specifically include: determining a digital gain value according to the brightness difference value and a preset conversion relationship. Here, the specific form of the preset conversion relationship may not be limited in the embodiment of the present invention, for example, a preset formula, a preset table, and so on.

Considering that when the digital gain value is less than 1, there may be a problem that the highlight area of the image is multiplied by the digital gain value, which results in the imbalance of multiple color channels, thereby causing the hue shift of the image, optionally, according to the Before determining the brightness difference value, the digital gain value also includes the following steps:

According to the brightness difference value, it is determined whether the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter; here, whether the exposure value corresponding to the second exposure parameter is higher than the first exposure parameter. Overexposure with an exposure value corresponding to an exposure parameter may indicate that the digital gain value is greater than one.

If the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the step of determining the digital gain value according to the brightness difference value is performed.

Optionally, if the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter, it may end (that is, the exposure value corresponding to the second exposure parameter is lower than the exposure value corresponding to the first exposure parameter). In a scene where the exposure value corresponding to an exposure parameter is under-exposed, the brightness of the image presented in the preview mode may not be controlled according to the brightness difference value), or it may be controlled in the manner shown in the embodiments shown in FIGS. 4 to 6 Describes the brightness of the image presented in preview mode. Here, whether the exposure value corresponding to the second exposure parameter is less than the exposure value corresponding to the first exposure parameter may indicate that the digital gain value is less than one.

Step 205: Before presenting the image in the preview mode, adjust the brightness value of the image according to the digital gain value.

In this step, the digital gain value can be used to adjust the brightness value of the image before the image is presented in the preview mode. Optionally, on the basis of the existing processing stage, a new processing stage can be added to adjust the brightness value of the image according to the digital gain value before the image is presented in preview mode; or, it can also be in preview mode Before presenting the image, the process of adjusting the brightness value of the image according to the digital gain value is added to the existing processing stage.

Further optionally, for ease of implementation, before the image is presented in the preview mode, the brightness value of the image is adjusted in the first processing stage according to the digital gain value; wherein, the first processing stage is When the camera is in the preview mode, a digital gain value is allowed to be set in all stages of processing the raw data obtained from the light metering area. Exemplarily, the first processing stage may be any one of the following stages: white balance (WBC) stage, color correction (CC) stage, gamma line adjustment stage, global hue Mapping (global tone mapping, GTM) stage and red-green-blue (RGB) color space conversion to YUV (also called YCrCb) color space (referred to as R2Y) stage. Among them, the processing sequence between the various stages may be as shown in FIG. 3, for example.

The camera control method provided by this embodiment determines the camera's first exposure parameter in the preview mode according to the preset target brightness, and determines the camera's position according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user. The second exposure parameter in shooting mode determines the brightness difference value according to the first exposure parameter and the second exposure parameter, determines the digital gain value according to the brightness difference value, and adjusts the image according to the digital gain value before presenting the image in preview mode The brightness value of, realizes the control of the brightness of the image presented in the preview mode according to the brightness difference value, so that the brightness of the image presented in the preview mode can be consistent with the brightness of the image captured in the shooting mode.

4 is a schematic flowchart of a camera control method provided by another embodiment of the present invention. Based on the embodiment shown in FIG. 1, this embodiment mainly describes another optional implementation manner of controlling the brightness of the image presented in the preview mode according to the brightness difference value. As shown in Figure 4, the method of this embodiment may include:

Step 401: Determine the first exposure parameter of the camera in the preview mode according to the preset target brightness.

It should be noted that step 401 is similar to step 101 and will not be repeated here.

Step 402: Determine the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user.

It should be noted that step 402 is similar to step 102, and will not be repeated here.

Step 403: Determine a brightness difference value according to the first exposure parameter and the second exposure parameter.

It should be noted that step 404 is similar to step 101 and will not be repeated here.

Step 404: Determine gear information according to the brightness difference value.

In this step, optionally, the gear information can be determined according to the brightness difference value and the corresponding relationship between different brightness difference values and gear information. Here, in the correspondence between different brightness difference values and gear information, the division granularity of the brightness difference values can be flexibly designed according to design requirements. It can be understood that the coarser the division granularity of the brightness difference value, the less the gear information in the corresponding relationship, the simpler the implementation but the lower the accuracy; the finer the division granularity of the brightness difference value, the more gear information in the correspondence relationship , The more complex the implementation but the higher the accuracy.

Or, optionally, the gear information can be determined according to the brightness value and a preset formula.

It should be noted that the present invention may not limit the manner in which the gear information is expressed. Optionally, it can be represented by letters, such as a file, b file, c file, etc.; or, it can be represented by a numerical value, such as first file, second file, and third file.

Wherein, the gear information may indicate the relationship between the target gamma line and the standard gamma line of the camera. Here, the standard gamma line can refer to the non-linear gamma line obtained by adjusting the linear gamma line of the camera in order to make the camera's response to changes in light intensity close to the response of the human eye to changes in light intensity. Horse line. For example, assuming that gear information x is gear a, gear a can indicate that the target gamma line is underexposed by 1 gear compared to the standard gamma line, gear information y is gear b, and gear b can indicate the target gamma line phase. Compared with the standard gamma line underexposure 2 gears. Among them, the relationship between the standard gamma line, the gamma line under-exposed by one gear compared to the standard gamma line, and the gamma line under-exposed by two gears compared to the standard gamma line, can be as Shown in Figure 5. It is understandable that the specific relationship between the gamma line and the standard gamma line of one gear with respect to the target gamma line overexposure or underexposure can be flexibly designed according to requirements, and the present invention may not limit this.

In order to make the representation of the gear information consistent with the representation of the gamma line, further optionally, when the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the gear The bit information is a positive number. At this time, the corresponding gamma line may be an overexposure* level, for example, overexposure 1 level (for example, can be expressed as 1EV gamma), or for example, overexposure 2 levels (for example, can be expressed as 2EV gamma).

In order to make the representation of the gear information consistent with the representation of the gamma line, it is further optional that the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter, and the gear information Is negative. At this time, the corresponding gamma line may be under-exposure*, for example, under-exposure 1 level (for example, can be expressed as -1EV gamma), or for example, under-exposure 2 levels (for example, can be expressed as -2EV gamma).

It should be noted that when the gear information is represented by a numerical value, it may be an integer (for example, 1) or a non-integer (for example, 0.5), and the present invention may not limit this.

Step 405: Determine the target gamma line used for exposure according to the gear information.

In this step, optionally, the target gamma line used for exposure can be generated in real time according to the gear information; or, optionally, for ease of implementation, it can be selected from the preset gamma line set. The gamma line corresponding to the gear information is used as the target gamma line.

In order to simplify the implementation of the gamma line set, the gamma line set may include gamma lines corresponding to part of the gear information, for example, it may only include the gamma lines corresponding to all integer gears, but not non-integer gears. Corresponding gamma line; or, it may include the gamma line corresponding to some integer gears, but not the gamma line corresponding to some integer gears and the gamma line corresponding to non-integer gears. Further optionally, step 405 may specifically include: selecting a first gamma line and a second gamma line corresponding to the gear information from a preset gamma line set; and according to the first gamma line And the second gamma line to determine the target gamma line. Optionally, the target gamma line may be determined according to the first gamma line and the second gamma line in an interpolation manner.

Step 406: In the process of presenting the image in the preview mode, use the target gamma line to perform exposure.

Here, in the process of presenting the image in the preview mode, the target gamma line is used for exposure, and the brightness of the image can be controlled through the adjustment of the gamma line, so that the brightness of the image presented in the preview mode can be the same as the brightness of the image taken in the shooting mode. The brightness of the image is consistent.

The camera control method provided by this embodiment determines the camera's first exposure parameter in the preview mode according to the preset target brightness, and determines the camera's position according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user. The second exposure parameter in the shooting mode determines the brightness difference value according to the first exposure parameter and the second exposure parameter, determines the gear position information according to the brightness difference value, and determines the target gamma line used for exposure according to the gear position information. In the process of presenting the image in the preview mode, the target gamma line is used for exposure, and the brightness of the image presented in the preview mode is controlled according to the brightness difference value, so that the brightness of the image presented in the preview mode can be compared with that in the shooting mode. The brightness of the captured images is consistent.

FIG. 6 is a schematic flowchart of a camera control method provided by another embodiment of the present invention. On the basis of the embodiment shown in FIG. 1, this embodiment mainly describes another optional implementation manner of controlling the brightness of the image presented in the preview mode according to the brightness difference value. As shown in FIG. 6, the method of this embodiment may include:

Step 601: Determine the first exposure parameter of the camera in the preview mode according to the preset target brightness.

It should be noted that step 601 is similar to step 101 and will not be repeated here.

Step 602: Determine the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user.

It should be noted that step 602 is similar to step 102 and will not be repeated here.

Step 603: Determine a brightness difference value according to the first exposure parameter and the second exposure parameter.

It should be noted that step 603 is similar to step 101 and will not be repeated here.

Step 604: Adjust the target brightness according to the brightness difference value to obtain the adjusted target brightness.

In this step, since the target brightness is used to determine the first exposure parameter, the first exposure parameter can be adjusted by adjusting the target brightness. Further, because the adjustment of the target brightness is determined according to the first exposure parameter and the second exposure parameter, the adjustment of the target brightness can make the brightness of the image presented according to the adjusted first exposure parameter in the preview mode comparable to the shooting In the mode, the brightness of the images taken according to the second exposure parameter is consistent.

Specifically, when the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the target brightness value may be adjusted to be larger, and the exposure value corresponding to the second exposure parameter is higher than the first exposure value. When the exposure value corresponding to the parameter is under-exposed, the target brightness value is adjusted to a lower third adjustment target, and the target brightness is adjusted according to the brightness difference value to obtain the adjusted target brightness.

It should be noted that the specific method for adjusting the target brightness according to the brightness difference value may not be limited in the embodiment of the present invention. Any specific method for adjusting the target brightness that satisfies the third adjustment target mentioned above belongs to the present invention. protected range. Optionally, for ease of implementation, the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter; step 604 may specifically include: comparing the target brightness with the brightness difference value The sum of absolute values is used as the adjusted target brightness. Optionally, for ease of implementation, the exposure value corresponding to the second exposure parameter is less exposed than the exposure value corresponding to the first exposure parameter; step 604 may specifically include: comparing the target brightness with the brightness difference value The difference between the absolute values is used as the adjusted target brightness.

Step 605: Adjust the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter.

In this step, since the first exposure parameter is determined according to the target brightness, after adjusting the target brightness, the first exposure parameter can be adjusted accordingly to obtain the adjusted first exposure parameter. Moreover, the exposure value corresponding to the adjusted first exposure parameter may be the same as the exposure value corresponding to the second exposure parameter, that is, the exposure value corresponding to the adjusted first exposure parameter may be the same as the exposure value corresponding to the second exposure parameter, or The difference between the adjusted exposure value corresponding to the first exposure parameter and the second exposure parameter may be less than a certain threshold.

Optionally, the camera's exposure value can be determined according to the difference between the exposure value determined by the automatic exposure algorithm and the adjusted target brightness, and the first exposure parameter can be adjusted according to the camera's exposure value to obtain the adjusted first Exposure parameters.

Exemplarily, the aperture, shutter, or sensitivity in the first exposure parameter may be adjusted. For example, if the first exposure parameter before adjustment is F value 2.8, shutter time is 1/20 second, ISO is 800, and the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, adjust The first exposure parameter after the F value is 2.8, the shutter time is 1/20 second, and the ISO is 400.

To facilitate implementation, the gain value of the sensor of the camera used for controlling the sensitivity of the first exposure parameter may be adjusted to obtain the adjusted first exposure parameter. That is, the gain value of the sensor changes compared with the first exposure parameter before adjustment and the first exposure parameter after adjustment. Here, the gain value of the sensor may include a digital gain value and/or an analog gain value. It should be noted that, since the gain value of the sensor is adjusted in the embodiment of the present invention, and the photometric value of the photometric system needs to be determined by the sensor, the accuracy of the photometric system may be reduced.

Step 606: During the process of presenting the image in the preview mode, perform exposure processing in the preview mode according to the adjusted first exposure parameter.

In this step, since the exposure value corresponding to the adjusted first exposure parameter can be consistent with the exposure value corresponding to the second exposure parameter, the brightness of the image presented in the preview mode according to the adjusted first exposure parameter can be It is consistent with the brightness of the image captured in the shooting mode according to the second exposure parameter.

It should be noted that, in the embodiment of the present invention, the second exposure parameter may not be adjusted, that is, the second exposure parameter is still used for exposure processing in the shooting mode.

The camera control method provided by this embodiment determines the camera's first exposure parameter in the preview mode according to the preset target brightness, and determines the camera's position according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user. The second exposure parameter in the shooting mode determines the brightness difference value according to the first exposure parameter and the second exposure parameter, and adjusts the target brightness according to the brightness difference value to obtain the adjusted target brightness. An exposure parameter is adjusted to obtain the adjusted first exposure parameter, and in the process of presenting the image in the preview mode, the exposure processing is performed in the preview mode according to the adjusted first exposure parameter to realize the brightness difference value, Control the brightness of the image presented in the preview mode, so that the brightness of the image presented in the preview mode can be consistent with the brightness of the image captured in the shooting mode.

The embodiment of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, the computer program includes at least one piece of code, and the at least one piece of code can be executed by a computer to control the The computer executes part or all of the steps of the camera control method in the foregoing method embodiments.

The embodiment of the present invention provides a computer program, when the computer program is executed by a computer, it is used to implement part or all of the steps of the camera control method in the foregoing method embodiments.

Fig. 7 is a camera control device provided by an embodiment of the present invention. As shown in FIG. 7, the camera control device 700 may include: a processor 701 and a memory 702;

The memory 702 is used to store program codes;

The processor 701 calls the program code, and when the program code is executed, is configured to perform the following operations:

In a possible implementation, the processor 701 is configured to control the brightness of the image presented in the preview mode according to the brightness difference value, which specifically includes:

Determining a digital gain value according to the brightness difference value;

Before presenting the image in the preview mode, adjust the brightness value of the image according to the digital gain value.

In a possible implementation, the processor 701 is configured to determine a digital gain value according to the brightness difference value, which specifically includes:

The digital gain value is determined according to the brightness difference value and the preset conversion relationship.

In a possible implementation, the processor 701 is further configured to: before determining the digital gain value according to the brightness difference value:

According to the brightness difference value, determining whether the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

In a possible implementation, the processor 701 is configured to adjust the brightness value of the image according to the digital gain value before presenting the image in the preview mode, which specifically includes:

Before presenting the image in the preview mode, adjust the brightness value of the image in the first processing stage according to the digital gain value; wherein, in the first processing stage, the camera is in the preview mode, A stage that allows setting of digital gain value among all stages of processing the raw data obtained from the metering area.

Determining gear information according to the brightness difference value;

According to the gear information, determine the target gamma line used for exposure;

In the process of presenting the image in the preview mode, the target gamma line is used for exposure.

In a possible implementation, the processor 701 is configured to determine the target gamma line used for exposure according to the gear information, which specifically includes:

In the preset gamma line set, the gamma line corresponding to the gear information is selected as the target gamma line.

In the preset gamma line set, select the first gamma line and the second gamma line corresponding to the gear information;

The target gamma line is determined according to the first gamma line and the second gamma line.

In a possible implementation, the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a positive number.

In a possible implementation, the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a negative number.

Adjusting the target brightness according to the brightness difference value to obtain the adjusted target brightness;

Adjusting the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter;

During the process of presenting the image in the preview mode, exposure processing is performed in the preview mode according to the adjusted first exposure parameter.

In a possible implementation, the processor 701 is configured to adjust the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter, which specifically includes:

According to the adjusted target brightness, the gain value of the sensor of the camera in the first exposure parameter is adjusted to obtain the adjusted first exposure parameter.

In a possible implementation, the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

The processor 701 is configured to adjust the target brightness according to the brightness difference value to obtain the adjusted target brightness, which specifically includes:

The sum of the absolute value of the target brightness and the brightness difference value is used as the adjusted target brightness.

In a possible implementation, the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter;

The difference between the target brightness and the absolute value of the brightness difference value is used as the adjusted target brightness.

The camera control device provided in this embodiment can be used to implement the technical solutions of the foregoing method embodiments of the present invention, and its implementation principles and technical effects are similar, and will not be repeated here.

A person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps including the foregoing method embodiments are executed; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention range.

Claims

A camera control method, characterized by comprising:

Determine the first exposure parameter of the camera in preview mode according to the preset target brightness;

Determining the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user;

Determine a brightness difference value according to the first exposure parameter and the second exposure parameter;

According to the brightness difference value, the brightness of the image presented in the preview mode is controlled.
The method according to claim 1, wherein the controlling the brightness of the image presented in the preview mode according to the brightness difference value comprises:

Determining a digital gain value according to the brightness difference value;

Before presenting the image in the preview mode, adjust the brightness value of the image according to the digital gain value.
The method according to claim 2, wherein the determining a digital gain value according to the brightness difference value comprises:

The digital gain value is determined according to the brightness difference value and the preset conversion relationship.
The method according to claim 2 or 3, wherein before determining the digital gain value according to the brightness difference value, the method further comprises:

According to the brightness difference value, determining whether the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

If the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the step of determining the digital gain value according to the brightness difference value is performed.
The method according to claim 4, wherein before the image is presented in the preview mode, adjusting the brightness value of the image according to the digital gain value comprises:

Before presenting the image in the preview mode, adjust the brightness value of the image in the first processing stage according to the digital gain value; wherein, in the first processing stage, the camera is in the preview mode, A stage that allows setting of digital gain value among all stages of processing the raw data obtained from the metering area.
The method according to claim 1, wherein the controlling the brightness of the image presented in the preview mode according to the brightness difference value comprises:

Determining gear information according to the brightness difference value;

According to the gear information, determine the target gamma line used for exposure;

In the process of presenting the image in the preview mode, the target gamma line is used for exposure.
The method according to claim 6, wherein the determining the target gamma line used for exposure according to the gear information comprises:

In the preset gamma line set, the gamma line corresponding to the gear information is selected as the target gamma line.
The method according to claim 6, wherein the determining the target gamma line used for exposure according to the gear information comprises:

In the preset gamma line set, select the first gamma line and the second gamma line corresponding to the gear information;

The target gamma line is determined according to the first gamma line and the second gamma line.
The method according to any one of claims 6-8, wherein the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a positive number .
The method according to any one of claims 6-8, wherein the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a negative number.
The method according to claim 1, wherein the controlling the brightness of the image presented in the preview mode according to the brightness difference value comprises:

Adjusting the target brightness according to the brightness difference value to obtain the adjusted target brightness;

Adjusting the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter;

During the process of presenting the image in the preview mode, exposure processing is performed in the preview mode according to the adjusted first exposure parameter.
11. The method according to claim 11, wherein the adjusting the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter comprises:

According to the adjusted target brightness, the gain value of the sensor of the camera in the first exposure parameter is adjusted to obtain the adjusted first exposure parameter.
The method according to claim 11 or 12, wherein the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

The adjusting the target brightness according to the brightness difference value to obtain the adjusted target brightness includes:

The sum of the absolute value of the target brightness and the brightness difference value is used as the adjusted target brightness.
The method according to claim 11 or 12, wherein the exposure value corresponding to the second exposure parameter is under-exposed than the exposure value corresponding to the first exposure parameter;

The adjusting the target brightness according to the brightness difference value to obtain the adjusted target brightness includes:

The difference between the target brightness and the absolute value of the brightness difference value is used as the adjusted target brightness.
A camera control device, characterized by comprising: a processor and a memory;

The memory is used to store program code;

The processor calls the program code, and when the program code is executed, is used to perform the following operations:

Determine the first exposure parameter of the camera in preview mode according to the preset target brightness;

Determining the second exposure parameter of the camera in the shooting mode according to the exposure value corresponding to the first exposure parameter and the exposure adjustment parameter set by the user;

Determine a brightness difference value according to the first exposure parameter and the second exposure parameter;

According to the brightness difference value, the brightness of the image presented in the preview mode is controlled.
The device according to claim 15, wherein the processor is configured to control the brightness of the image presented in the preview mode according to the brightness difference value, which specifically comprises:

Determining a digital gain value according to the brightness difference value;

Before presenting the image in the preview mode, adjust the brightness value of the image according to the digital gain value.
The device according to claim 16, wherein the processor is configured to determine a digital gain value according to the brightness difference value, which specifically comprises:

The digital gain value is determined according to the brightness difference value and the preset conversion relationship.
The device according to claim 16 or 17, wherein the processor is further configured to: before determining the digital gain value according to the brightness difference value:

According to the brightness difference value, determining whether the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

If the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, the step of determining the digital gain value according to the brightness difference value is performed.
The apparatus according to claim 18, wherein the processor is configured to adjust the brightness value of the image according to the digital gain value before presenting the image in the preview mode, specifically comprising:

Before presenting the image in the preview mode, adjust the brightness value of the image in the first processing stage according to the digital gain value; wherein, in the first processing stage, the camera is in the preview mode, A stage that allows setting of digital gain value among all stages of processing the raw data obtained from the metering area.
The device according to claim 15, wherein the processor is configured to control the brightness of the image presented in the preview mode according to the brightness difference value, which specifically comprises:

Determining gear information according to the brightness difference value;

According to the gear information, determine the target gamma line used for exposure;

In the process of presenting the image in the preview mode, the target gamma line is used for exposure.
The device according to claim 20, wherein the processor is configured to determine the target gamma line used for exposure according to the gear information, which specifically comprises:

In the preset gamma line set, the gamma line corresponding to the gear information is selected as the target gamma line.
The device according to claim 20, wherein the processor is configured to determine the target gamma line used for exposure according to the gear information, which specifically comprises:

In the preset gamma line set, select the first gamma line and the second gamma line corresponding to the gear information;

The target gamma line is determined according to the first gamma line and the second gamma line.
The device according to any one of claims 20-22, wherein the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a positive number .
The device according to any one of claims 20-22, wherein the exposure value corresponding to the second exposure parameter is underexposed than the exposure value corresponding to the first exposure parameter, and the gear information is a negative number.
The device according to claim 15, wherein the processor is configured to control the brightness of the image presented in the preview mode according to the brightness difference value, which specifically comprises:

Adjusting the target brightness according to the brightness difference value to obtain the adjusted target brightness;

Adjusting the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter;

During the process of presenting the image in the preview mode, exposure processing is performed in the preview mode according to the adjusted first exposure parameter.
The device according to claim 25, wherein the processor is configured to adjust the first exposure parameter according to the adjusted target brightness to obtain the adjusted first exposure parameter, which specifically includes :

According to the adjusted target brightness, the gain value of the sensor of the camera in the first exposure parameter is adjusted to obtain the adjusted first exposure parameter.
The device according to claim 25 or 26, wherein the exposure value corresponding to the second exposure parameter is overexposed than the exposure value corresponding to the first exposure parameter;

The processor is configured to adjust the target brightness according to the brightness difference value to obtain the adjusted target brightness, which specifically includes:

The sum of the absolute value of the target brightness and the brightness difference value is used as the adjusted target brightness.
The device according to claim 25 or 26, wherein the exposure value corresponding to the second exposure parameter is under-exposed than the exposure value corresponding to the first exposure parameter;

The processor is configured to adjust the target brightness according to the brightness difference value to obtain the adjusted target brightness, which specifically includes:

The difference between the target brightness and the absolute value of the brightness difference value is used as the adjusted target brightness.
A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, the computer program includes at least one piece of code, and the at least one piece of code can be executed by a computer to control the computer to execute The camera control method described in any one of 1-14 is required.
A computer program, characterized in that, when the computer program is executed by a computer, it is used to implement the camera control method according to any one of claims 1-14.