Image shooting method and device and electronic equipment

Abstract

The invention provides an image shooting method and device and electronic equipment, and relates to the technical field of security and protection monitoring. The method comprises the following steps: acquiring a target photosensitive value of a monitoring environment where a monitoring area is located; determining a working mode of the monitoring equipment based on the target photosensitive value, wherein the working mode comprises a daytime mode or a night mode; in the working mode, target exposure amounts corresponding to the main camera and the auxiliary camera are determined based on the target photosensitive value; according to the invention, the main camera and the auxiliary camera are respectively controlled to shoot the image of the monitoring area in the working mode based on the target exposure corresponding to the main camera and the auxiliary camera, and the quality of the image shot by the main camera and the auxiliary camera can be effectively improved when the main camera and the auxiliary camera are controlled to start to enter the shooting mode.

Description

Technical Field

[0001] This application relates to the field of security monitoring technology, and in particular to an image capturing method, device and electronic device. Background Technology

[0002] Currently, dual-camera cameras have become a new type of camera in the security monitoring industry, widely used in building and corridor monitoring scenarios. A dual-camera system consists of a main camera and an auxiliary camera. The main camera monitors the area directly in front, while the auxiliary camera monitors the area below, preventing the loss of details in blind spots.

[0003] When capturing images using a dual-camera setup, the main camera typically detects a human figure first, and then controls both the main and auxiliary cameras to start shooting. However, considering the differences between the main and auxiliary cameras in terms of monitoring field of view, hardware solutions, and startup algorithms, the image quality captured by each camera is often poor. Summary of the Invention

[0004] This application provides an image capturing method, apparatus, and electronic device, which can effectively improve the image quality captured by the main camera and the auxiliary camera respectively when controlling the main camera and the auxiliary camera to start entering the shooting mode.

[0005] This application provides an image capture method applied to a monitoring device, the monitoring device including a main camera and an auxiliary camera, the method comprising: Obtain the target photosensitivity value of the monitoring environment where the monitoring area is located; The operating mode of the monitoring device is determined based on the target photosensitivity value, and the operating mode includes a daytime mode or a nighttime mode. In the operating mode, the target exposure of the main camera and the auxiliary camera is determined respectively based on the target photosensitivity value; Based on the target exposure levels corresponding to the main camera and the auxiliary camera, the main camera and the auxiliary camera are respectively controlled to capture images of the monitored area in the working mode.

[0006] According to an image capture method provided in this application, in the operating mode, determining the target exposure of the auxiliary camera corresponding to the target light sensitivity value includes: When the working mode is daytime mode, the initial exposure of the auxiliary camera is determined based on the target photosensitivity value; Determine the target proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, wherein the overlapping area is the area where the monitoring area of ​​the main camera and the monitoring area of ​​the auxiliary camera overlap. The initial exposure is corrected based on the target proportion to obtain the target exposure corresponding to the auxiliary camera.

[0007] According to an image capture method provided in this application, in the operating mode, determining the target exposure of the main camera corresponding to the target light sensitivity value includes: When the working mode is night mode, the target fill light brightness provided by the main fill light is determined based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay. Based on the target fill light brightness provided by the main fill light, the target photosensitivity value, and the lens aperture diameter of the main camera, the target exposure corresponding to the main camera is determined.

[0008] According to an image capture method provided in this application, determining the target fill light brightness provided by the main fill light based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay includes: Based on the current fill light intensity of the main fill light, the maximum fill light intensity of the main fill light, and the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the main fill light decays for the preset time is determined. The target fill light brightness provided by the main fill light is determined based on the fill light intensity of the main fill light attenuated for a preset time, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light, the fill light brightness provided by the auxiliary fill light after attenuation, and the error coefficient of the main fill light in the monitoring environment and the calibration environment.

[0009] According to an image capture method provided in this application, in the operating mode, determining the target exposure of the auxiliary camera corresponding to the target light sensitivity value includes: When the working mode is night mode, the target fill light provided by the auxiliary fill light is determined based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay. The target exposure amount corresponding to the auxiliary camera is determined based on the target fill light brightness of the auxiliary fill light, the target photosensitivity value, and the lens aperture diameter of the auxiliary camera.

[0010] According to an image capture method provided in this application, determining the target fill light brightness provided by the auxiliary fill light based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay includes: Based on the current fill light intensity of the auxiliary fill light, the maximum fill light intensity of the auxiliary fill light, and the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the auxiliary fill light decays for the preset time is determined. The target supplementary light brightness provided by the auxiliary supplementary light is determined based on the supplementary light intensity provided by the auxiliary supplementary light after attenuation for a preset time, the proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, the rotation angle of the auxiliary supplementary light, the supplementary light brightness provided by the main supplementary light after attenuation, and the error coefficient of the auxiliary supplementary light in the monitoring environment and the calibration environment.

[0011] According to an image capturing method provided in this application, the method further includes: If the light intensity attenuation rate determined based on the target fill light brightness provided by the main fill light and the historical target fill light brightness provided by the main fill light previously determined is greater than the light intensity attenuation rate threshold, the reference fill light brightness of the main fill light is determined based on the reference exposure, the target photosensitive value and the lens aperture diameter of the main camera. Based on the reference fill light brightness, the fill light brightness provided after the main fill light is attenuated, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light and the fill light brightness provided after the auxiliary fill light is attenuated, the correction error coefficient of the main fill light is determined in the monitoring environment and the calibration environment. Based on the correction error coefficient, the error coefficient of the main supplementary light is updated in the monitoring environment and the calibration environment.

[0012] This application also provides an image capturing device for use in a monitoring device, the monitoring device including a main camera and an auxiliary camera, the device comprising: The acquisition unit is used to acquire the target photosensitivity value of the monitoring environment where the monitoring area is located. The first processing unit is used to determine the working mode of the monitoring device based on the target photosensitivity value, wherein the working mode includes a daytime mode or a nighttime mode. The second processing unit is used to determine the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitivity value in the working mode. The control unit is used to control the main camera and the auxiliary camera to capture images of the monitored area in the working mode, based on the target exposure corresponding to the main camera and the auxiliary camera respectively.

[0013] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the image capturing method as described above.

[0014] This application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the image capturing method as described above.

[0015] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the image capturing method as described above.

[0016] The image capturing method, apparatus, and electronic device provided in this application, when controlling the main camera and auxiliary camera to capture images of a monitored area, can first obtain the target photosensitive value of the monitoring environment where the monitored area is located; determine the working mode of the monitoring equipment based on the target photosensitive value, including daytime mode or nighttime mode; in the working mode, determine the target exposure amount corresponding to each of the main camera and auxiliary camera based on the target photosensitive value; and control the main camera and auxiliary camera to capture images of the monitored area in the working mode based on the target photosensitive value of the monitoring environment where the monitored area is located. In this way, by determining the target exposure amount corresponding to each of the main camera and auxiliary camera in different working modes through the target photosensitive value of the monitoring environment where the monitored area is located, and based on the target exposure amount corresponding to each of the main camera and auxiliary camera, the images captured by the main camera and auxiliary camera in the monitored area can be better controlled, effectively improving the image quality captured by the main camera and auxiliary camera when controlling the main camera and auxiliary camera to start capturing mode. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a monitoring diagram of a main camera and an auxiliary camera provided for an embodiment of this application.

[0019] Figure 2 This is a flowchart illustrating an image capturing method provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram illustrating the radiation range of a supplementary light provided in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of an image capturing device provided in an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] The technical solutions provided in this application are adaptable to security monitoring scenarios. Currently, dual-camera cameras have become a new type of camera in the security monitoring industry, widely used in building corridor monitoring scenarios. They generally include a main camera and an auxiliary camera. For example, see... Figure 1 As shown, Figure 1 This is a monitoring diagram of a main camera and an auxiliary camera provided in an embodiment of this application. The main camera is used to monitor the area directly in front, and the auxiliary camera is used to monitor the area below, which can avoid the loss of details in blind spots.

[0026] When capturing images using a dual-camera setup, the main camera typically detects a human figure first, and then controls both the main and auxiliary cameras to start shooting. However, considering the differences between the main and auxiliary cameras in terms of monitoring field of view, hardware solutions, and startup algorithms, the image quality captured by each camera is often poor.

[0027] To effectively improve the image quality captured by both the main and auxiliary cameras when they enter shooting mode, this application provides an image capturing method. The following specific embodiments will describe the image capturing method in detail. It is understood that these specific embodiments can be combined with each other, and similar concepts or processes may not be repeated in some embodiments.

[0028] Figure 2 This is a flowchart illustrating an image capture method provided in an embodiment of this application. This method can be applied to surveillance equipment, which includes a main camera and an auxiliary camera. For example, please refer to... Figure 2 As shown, the image capturing method may include: S201. Obtain the target photosensitivity value of the monitoring environment where the monitoring area is located.

[0029] For example, when obtaining the target photosensitive value of the monitoring environment where the monitoring area is located, the target photosensitive value of the monitoring environment can be collected by a photosensitive device set near the main camera.

[0030] S202. Determine the working mode of the monitoring equipment based on the target photosensitivity value. The working mode includes daytime mode or nighttime mode.

[0031] For example, when determining the operating mode of a monitoring device based on the target's photosensitivity value, the target's photosensitivity value can be compared with the illuminance values ​​under day and night conditions to determine the operating mode of the monitoring device. It can be understood that the operating mode of the monitoring device here refers to both the operating mode of the main camera and the operating mode of the auxiliary camera.

[0032] S203. In working mode, the target exposure of the main camera and the auxiliary camera is determined based on the target photosensitivity value.

[0033] Normally, in daytime mode, the image is in color and there is no need to turn on the fill light; in nighttime mode, the image is in black and white and requires the fill light to provide illumination.

[0034] For example, in the embodiments of this application, when determining the target exposure of the main camera and the auxiliary camera respectively based on the target photosensitivity value, the relationship between the photosensitivity value and the exposure of the main camera and the auxiliary camera respectively in daytime mode and nighttime mode can be calibrated in advance under a calibration environment, such as a laboratory environment. For example, see Table 1 below: Table 1

[0035] As shown in Table 1, in a laboratory environment, experiments can be conducted to determine the optimal photosensitivity value in daytime mode. At that time, the exposure corresponding to the main camera is The exposure corresponding to the auxiliary camera is When the photosensitivity value is At that time, the exposure corresponding to the main camera is The exposure corresponding to the auxiliary camera is In night mode, when the photosensitivity value is... At that time, the exposure corresponding to the main camera is The main fill light of the main camera provides a brightness of The exposure corresponding to the auxiliary camera is The auxiliary light provided by the auxiliary camera is When the photosensitivity value is At that time, the exposure corresponding to the main camera is The main fill light of the main camera provides a brightness of The exposure corresponding to the auxiliary camera is The auxiliary light provided by the auxiliary camera is .

[0036] For example, in night mode, the brightness of the fill light can be divided into N levels. Different photosensitivity values ​​correspond to different fill light brightness levels. The value of N and the corresponding fill light brightness can be set according to actual needs.

[0037] As shown in Table 1 above, in a laboratory environment, the relationship between the photosensitivity value and the corresponding exposure amounts of the main camera and the auxiliary camera can be pre-established. After obtaining the target photosensitivity value, the target exposure amounts for the main camera and the auxiliary camera can be determined based on this value. Once the target exposure amounts for the main camera and the auxiliary camera are determined, the main camera can be controlled to capture images of the monitored area in its working mode based on the target exposure amount for the main camera, and the auxiliary camera can be controlled to capture images of the monitored area in its working mode based on the target exposure amount for the auxiliary camera, i.e., executing the following S204: S204. Based on the target exposure of the main camera and the auxiliary camera respectively, control the main camera and the auxiliary camera to capture images of the monitored area in the working mode.

[0038] For example, in the embodiments of this application, controlling the main camera and the auxiliary camera to capture images of the monitoring area in working mode based on the target exposure of the main camera and the auxiliary camera respectively may include adjusting the fill light intensity, aperture size, exposure time, and gain when the camera starts up according to the difference between the target exposure and the user-set exposure, as well as the influence factors on the brightness of the image such as fill light, aperture, exposure time, and gain, so that the brightness of the first frame image is close to the user-set exposure. Those skilled in the art can fully understand that the automatic exposure adjustment method based on global exposure or face area exposure can be applied to this step without creative effort.

[0039] As can be seen from the embodiments of this application, when controlling the main camera and auxiliary camera to capture images of the monitored area, the target light sensitivity value of the monitoring environment where the monitored area is located can be obtained first; the working mode of the monitoring equipment can be determined based on the target light sensitivity value, including daytime mode or nighttime mode; in the working mode, the target exposure amount corresponding to the main camera and auxiliary camera can be determined respectively based on the target light sensitivity value; based on the target exposure amount corresponding to the main camera and auxiliary camera respectively, the main camera and auxiliary camera can be controlled to capture images of the monitored area in the working mode. In this way, by using the target light sensitivity value of the monitoring environment where the monitored area is located, the target exposure amount corresponding to the main camera and auxiliary camera in different working modes can be determined, and based on the target exposure amount corresponding to the main camera and auxiliary camera respectively, the images captured by the main camera and auxiliary camera in the monitored area can be controlled better, and the image quality captured by the main camera and auxiliary camera can be effectively improved when the main camera and auxiliary camera are controlled to start entering the shooting mode.

[0040] Based on the above Figure 2 In the embodiment shown, in the above-described S203, when determining the target exposure of the main camera and the auxiliary camera respectively based on the target photosensitivity value in the working mode, at least two of the following possible implementation methods may be included: In one possible implementation, the working mode is daytime mode, and the target exposure of the main camera and the auxiliary camera can be determined separately based on the target light sensitivity value.

[0041] When the working mode is daytime mode, when determining the target exposure of the main camera based on the target photosensitivity value, the relationship between the photosensitivity value and the exposure of the main camera and the auxiliary camera can be pre-built in a laboratory environment. For example, see Formula 1 below: Formula 1

[0042] in, Indicates exposure volume. Indicates photosensitivity value, and It is a constant.

[0043] Referring to Formula 1, when determining the target exposure for the main camera based on the target photosensitivity value, the target photosensitivity value can be substituted into Formula 1 to obtain the corresponding exposure. In this embodiment, when setting the relative positions of the main camera and the auxiliary camera, the target proportion within the monitoring area of ​​the auxiliary camera can be used as the ratio of the overlapping area to the target proportion. Then it needs to be controlled at 30% < <100%. The overlapping area refers to the area where the monitoring area of ​​the main camera overlaps with the monitoring area of ​​the auxiliary camera. The percentage of the target within the monitoring area of ​​the auxiliary camera is the overlapping area. The larger the value, the closer the photosensitive device is to the main camera, and the more accurate the target photosensitive value is. The exposure value determined based on Formula 1 is also closer to the calibrated exposure value in the laboratory environment. Therefore, the exposure value determined by Formula 1 can be directly used as the target exposure value corresponding to the main camera. In this way, the main camera can be better controlled to capture images of the monitored area based on the target exposure value corresponding to the main camera. This effectively improves the image quality captured by the main camera when controlling the main camera and auxiliary camera to start shooting mode.

[0044] It is understandable that, unlike the main camera mentioned above, the auxiliary camera is farther away from the photosensitive device, and the field of view is very different. Therefore, the exposure determined based on Formula 1 above also has a large difference from the calibrated exposure in the laboratory environment. Therefore, the exposure determined based on Formula 1 above needs to be corrected, as can be seen in the relevant description below.

[0045] When the working mode is daytime mode, when determining the target exposure of the auxiliary camera based on the target photosensitive value, the initial exposure of the auxiliary camera can be determined first based on the target photosensitive value; and the target proportion of the overlapping area in the monitoring area of ​​the auxiliary camera can be determined, where the overlapping area is the overlapping area between the monitoring area of ​​the main camera and the monitoring area of ​​the auxiliary camera; then the initial exposure is corrected based on the target proportion to obtain the target exposure of the auxiliary camera.

[0046] For example, when determining the initial exposure of the auxiliary camera based on the target photosensitivity value, the target photosensitivity value can be substituted into Formula 1 above to obtain the corresponding exposure, which is the initial exposure of the auxiliary camera.

[0047] For example, when correcting the initial exposure based on the target proportion to obtain the target exposure for the auxiliary camera, see Formula 2 below: A_Exp_Corect Formula 2

[0048] in, A_Exp_Corect This indicates the target exposure corresponding to the auxiliary camera. This represents the environmental correction factor. This indicates the percentage of the target within the monitoring area of ​​the auxiliary camera, representing the overlapping area. This indicates the initial exposure of the auxiliary camera.

[0049] Combining Formula 2 above, the exposure amount determined based on Formula 1 above can be modified to obtain the target exposure amount corresponding to the auxiliary camera. In this way, the images captured by the auxiliary camera in the monitoring area can be better controlled based on the target exposure amount corresponding to the auxiliary camera. This effectively improves the image quality captured by the auxiliary camera when controlling the main camera and the auxiliary camera to start shooting mode.

[0050] Unlike the daytime mode described above, the nighttime mode requires supplemental lighting. A common supplemental lighting solution for dual-camera cameras is to pair the main camera with an infrared LED, which can be called the main supplemental light or main camera supplemental light, to avoid the eye strain caused by white light. The secondary camera is paired with a white light, which can be called the secondary supplemental light or secondary camera supplemental light, to improve the resolution of actual objects. For example, see [example provided]. Figure 3 As shown, Figure 3 This is a schematic diagram of the radiation range of a supplementary light provided in an embodiment of this application. In a nighttime environment, the main supplementary light and the auxiliary supplementary light reflect the environment and have different radiation ranges under different environments and with different intensities. This results in a large error in the exposure amount calibrated in the laboratory environment. Therefore, in another possible implementation, the working mode is nighttime mode, and the target exposure amount corresponding to the main camera and the auxiliary camera can be determined based on the target photosensitivity value.

[0051] When the working mode is night mode, when determining the target exposure of the main camera based on the target photosensitivity value, the target photosensitivity provided by the main fill light can be determined first based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay. Then, the target exposure of the main camera can be determined based on the target photosensitivity value, the target fill light brightness provided by the main fill light, and the lens aperture diameter of the main camera.

[0052] For example, when determining the target fill light brightness provided by the main fill light based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay, the light decay of the main fill light itself is taken into consideration, such as the loss caused by usage time and frequent switching on and off, as well as the difference in intensity contribution in different areas of the illumination field of view. Therefore, the fill light brightness provided by the main fill light after the current fill light intensity decays for a preset time can be determined first based on the current fill light intensity of the main fill light, the maximum fill light intensity of the main fill light, and the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, as shown in Formula 3 below: Formula 3

[0053] in, This indicates the brightness of the fill light provided after the current fill light intensity of the main fill light has decayed for a preset time. This indicates the current fill light intensity of the main fill light. This indicates the maximum fill light intensity of the main fill light; the preset duration can be recorded as... Its value can be set according to actual needs. Indicates the preset duration of maximum brightness decay for the main fill light. The supplementary lighting brightness provided afterward The brightness produced when the main fill light intensity is at its maximum. It is a constant.

[0054] After determining the supplementary light brightness provided by the main supplementary light after the current supplementary light intensity decays for a preset time using Formula 3, the target supplementary light brightness provided by the main supplementary light can be further determined by combining the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main supplementary light, the supplementary light brightness provided after the auxiliary supplementary light decays, and the error coefficient of the main supplementary light in the monitoring environment and the calibration environment. As time increases, the light intensity of the supplementary light gradually decreases. For example, see Formula 4 below: Formula 4

[0055] in, This indicates the target fill light brightness provided by the main fill light. This represents the attenuation rate coefficient of the main fill light. This indicates the adjustment factor of the main fill light. This indicates the percentage of the overlapping area within the main camera's monitoring area. This indicates the rotation angle of the main fill light. This indicates the brightness of the supplementary light provided after the auxiliary light has faded. This indicates the contribution of the fill light to the main camera. This represents the function relating the rotation angle of the main fill light to the overlapping area. It should be noted that in this embodiment, the illumination range of the fill light is not limited to being fixed; the fill light can have a fixed angle. If the fill light range is constant, then... Alternatively, the fill light angle can be rotated according to actual usage needs, meaning the fill light range is variable; this is commonly seen in PTZ cameras. This represents the error coefficient of the main supplemental light under monitoring and calibration conditions; this relative error... The main reason for the difference in light attenuation is the difference between the actual usage environment and the calibration environment. Combining the above formula 4, it is not difficult to see that for the main camera, the smaller the overlap area, the less the auxiliary camera's fill light has an impact on it, and the main impact comes from the reflection of the main camera's own fill light. Conversely, the larger the overlap area, the greater the impact.

[0056] Based on the above description, after determining the target illumination brightness provided by the main fill light, the target exposure of the main camera can be determined jointly based on the target illumination brightness provided by the main fill light, the target photosensitivity value, and the aperture diameter of the main camera lens. For example, see Formula 5 below: Formula 5

[0057] in, This indicates the target exposure corresponding to the main camera. This indicates the target fill light brightness provided by the main fill light. This indicates the aperture diameter of the main camera lens. and All are constants. It's understandable that in a primary infrared, secondary white light scheme, for the primary camera, The light mainly comes from the reflection of the monitoring environment by the main and auxiliary fill lights.

[0058] Based on the above description, the target exposure of the main camera in night mode can be determined. This allows for better control of the main camera's image capture of the monitored area, effectively improving the image quality captured by the main camera when controlling both the main and auxiliary cameras to enter shooting mode.

[0059] In night mode, when determining the target exposure of the auxiliary camera based on the target photosensitive value, the target photosensitive value of the auxiliary camera can be determined first by the current photosensitive value of the auxiliary fill light, the photosensitive value provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the photosensitive value provided after the main fill light of the main camera decays. Then, the target photosensitive value of the auxiliary camera can be determined based on the target photosensitive value of the auxiliary fill light, the target photosensitive value of the auxiliary camera, and the aperture diameter of the auxiliary camera lens.

[0060] For example, when determining the target fill light brightness provided by the auxiliary fill light based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light has decayed for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay, the light decay of the auxiliary fill light itself is taken into consideration, such as the loss caused by usage time and frequent switching on and off, as well as the difference in intensity contribution in different areas of the illumination field of view. Therefore, the fill light brightness provided by the auxiliary fill light after the current fill light intensity has decayed for a preset time can be determined first based on the current fill light intensity of the auxiliary fill light, the maximum fill light intensity of the auxiliary fill light, and the fill light brightness provided after the maximum brightness of the auxiliary fill light has decayed for a preset time, as shown in Formula 6 below: Formula 6

[0061] in, This indicates the brightness of the fill light provided after the current fill light intensity of the fill light has decayed for a preset time. This indicates the current fill light intensity of the auxiliary light. This indicates the maximum fill light intensity of the auxiliary light; the preset duration can be denoted as [value missing]. Its value can be set according to actual needs. Indicates the preset duration of maximum brightness decay of the supplementary light. The supplementary lighting brightness provided afterward The brightness produced when the supplementary lighting intensity is at its maximum. It is a constant.

[0062] After determining the supplementary light intensity provided by the auxiliary light after a preset attenuation time using Formula 6, the target supplementary light intensity can be further determined by considering the proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, the rotation angle of the auxiliary light, the supplementary light intensity provided after the main light attenuates, and the error coefficient of the auxiliary light in the monitoring and calibration environments. As time increases, the light intensity of the supplementary light gradually decreases. For example, see Formula 7 below: Formula 7

[0063] in, This indicates the target illumination brightness provided by the supplementary lighting. This represents the attenuation rate coefficient of the supplementary lighting. This indicates the adjustment factor for the supplementary light. This indicates the percentage of the overlapping area within the monitoring area of ​​the auxiliary camera. This indicates the rotation angle of the supplementary light. This indicates the brightness of the fill light provided after the main fill light has faded. This indicates the contribution of the main light to the auxiliary camera. This represents the function relating the rotation angle of the supplementary light to the overlapping area. It should be noted that in this embodiment, the illumination range of the supplementary light is not limited to being fixed; the supplementary light can have a fixed angle. If the illumination range is constant, then... Alternatively, the fill light angle can be rotated according to actual usage needs, meaning the fill light range is variable; this is commonly seen in PTZ cameras. This represents the error coefficient of the supplementary lighting under monitoring and calibration conditions; this relative error... The main reason for the difference in light attenuation is the difference between the actual usage environment and the calibration environment. Combining the above formula 7, it is not difficult to see that for the auxiliary camera, the smaller the overlap area, the less the main fill light of the main camera has an impact on it, and the main impact comes from the reflection of the auxiliary camera's own main fill light. Conversely, the larger the overlap area, the greater the impact.

[0064] It should be noted that when the supplementary lighting scheme, as exemplified in this application embodiment, uses infrared light for the main camera and visible light for the auxiliary camera, the auxiliary camera needs to filter out the infrared light from the main camera to ensure that the image captured by the auxiliary camera does not have a reddish tint. That is, the influence of the infrared light on the brightness of the auxiliary camera needs to be negligible. In this case, the adjustment coefficient of the auxiliary supplementary light can be set. This ensures that the images captured by the auxiliary camera do not have a red tint.

[0065] Based on the above description, after determining the target illumination brightness provided by the auxiliary fill light, the target exposure of the auxiliary camera can be determined jointly based on the target illumination brightness provided by the auxiliary fill light, the target photosensitivity value, and the aperture diameter of the auxiliary camera lens. For example, see Formula 8 below: Formula 8

[0066] in, This indicates the target exposure corresponding to the auxiliary camera. This indicates the target illumination brightness provided by the supplementary lighting. This indicates the aperture diameter of the auxiliary camera lens. and All are constants. It's understandable that in a primary infrared and secondary white light scheme, for the secondary camera, The light mainly comes from the reflection of the monitoring environment by the auxiliary lights themselves.

[0067] Based on the above description, the target exposure of the auxiliary camera in night mode can be determined. This allows for better control of the auxiliary camera's image capture of the monitored area, effectively improving the image quality captured by the auxiliary camera when controlling both the main and auxiliary cameras to enter shooting mode.

[0068] Based on the above embodiments, it is worth noting that in Formula 4 above, when determining the target supplementary light brightness provided by the main supplementary light by combining the error coefficients of the main supplementary light in the monitoring environment and the calibration environment, the error coefficients of the main supplementary light in the monitoring environment and the calibration environment are not fixed, but need to be adjusted according to actual needs; similarly, the error coefficients of the auxiliary supplementary light in the monitoring environment and the calibration environment are also not fixed, and also need to be adjusted according to actual needs.

[0069] For example, in this embodiment of the application, when adjusting the error coefficient of the main supplementary light in the monitoring environment and the calibration environment according to actual needs, the light intensity attenuation rate can be determined first based on the target supplementary light brightness provided by the main supplementary light and the historical target supplementary light brightness provided by the main supplementary light determined in the previous instance, as shown in the following formula 9: Formula 9

[0070] in, Indicates the light intensity attenuation rate. This indicates the target fill light brightness provided by the main fill light. This indicates the historical target fill light intensity provided by the previously determined main fill light.

[0071] If the determined light intensity attenuation rate is less than or equal to the light intensity attenuation rate threshold, there is no need to update the error coefficient of the main supplementary light in the monitoring and calibration environments. Conversely, if the determined light intensity attenuation rate is greater than the light intensity attenuation rate threshold, the error coefficient of the main supplementary light in the monitoring and calibration environments can be further updated. This avoids affecting the image quality captured by the main camera due to the error coefficient. The value of the light intensity attenuation rate threshold can be set according to actual needs.

[0072] For example, when updating the error coefficient of the main fill light in the monitoring environment and the calibration environment, the reference fill light brightness of the main fill light can be determined based on the reference exposure, the target photosensitive value, and the aperture diameter of the main camera lens. Then, based on the reference fill light brightness, the fill light brightness provided after the main fill light attenuates, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light, and the fill light brightness provided after the auxiliary fill light attenuates, the correction error coefficient of the main fill light in the monitoring environment and the calibration environment can be determined. Finally, based on the correction error coefficient, the error coefficient of the main fill light in the monitoring environment and the calibration environment can be updated to achieve the update of the error coefficient of the main fill light in the monitoring environment and the calibration environment.

[0073] The reference fill light brightness is the optimal fill light brightness when the main camera captures an image.

[0074] For example, when determining the reference fill light brightness of the main fill light based on the reference exposure, target photosensitive value, and the aperture diameter of the main camera lens, the reference fill light brightness of the main fill light can be derived by using the exposure as a known parameter, as shown in Formula 5 above. Then, the reference fill light brightness derived from the main fill light can be used as a known parameter, as shown in Formula 4 above, to derive a new... The new This involves adjusting the correction error coefficient of the main fill light in both the monitoring and calibration environments. Then, the original error coefficient of the main fill light in both the monitoring and calibration environments is updated using the correction error coefficient. This update effectively avoids inaccurate error coefficients affecting the image quality captured by the main camera, thereby further improving the image quality captured by the main camera.

[0075] It is understood that in the embodiments of this application, when updating the error coefficient of the auxiliary fill light in the monitoring environment and the calibration environment, its specific implementation is similar to the specific implementation of updating the error coefficient of the main fill light in the monitoring environment and the calibration environment. Please refer to the relevant description of updating the error coefficient of the main fill light in the monitoring environment and the calibration environment. Here, the embodiments of this application will not repeat it.

[0076] The image capturing apparatus provided in this application is described below. The image capturing apparatus described below can be referred to in correspondence with the image capturing method described above.

[0077] Figure 4 This is a schematic diagram of an image capturing device provided in an embodiment of this application, applied to a monitoring device. The monitoring device includes a main camera and an auxiliary camera. For example, please refer to [link to example]. Figure 4 As shown, the image capturing device 40 may include: Acquisition unit 401 is used to acquire the target photosensitivity value of the monitoring environment where the monitoring area is located; The first processing unit 402 is used to determine the working mode of the monitoring device based on the target photosensitivity value, the working mode including daytime mode or nighttime mode; The second processing unit 403 is used to determine the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitivity value in the working mode. The control unit 404 is used to control the main camera and the auxiliary camera to capture images of the monitored area in the working mode based on the target exposure of the main camera and the auxiliary camera respectively.

[0078] For example, in this embodiment of the application, in the operating mode, the second processing unit 403 is used to determine the target exposure amount corresponding to the auxiliary camera under the target photosensitivity value, including: When the working mode is daytime mode, the initial exposure of the auxiliary camera is determined based on the target photosensitivity value; Determine the target proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, wherein the overlapping area is the area where the monitoring area of ​​the main camera and the monitoring area of ​​the auxiliary camera overlap. The initial exposure is corrected based on the target proportion to obtain the target exposure corresponding to the auxiliary camera.

[0079] For example, in this embodiment of the application, in the operating mode, the second processing unit 403 is used to determine the target exposure amount corresponding to the target light sensitivity value of the main camera, including: When the working mode is night mode, the target fill light brightness provided by the main fill light is determined based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay. Based on the target fill light brightness provided by the main fill light, the target photosensitivity value, and the lens aperture diameter of the main camera, the target exposure corresponding to the main camera is determined.

[0080] For example, in this embodiment of the application, the second processing unit 403 is used to determine the target fill light brightness provided by the main fill light based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided after the auxiliary fill light of the auxiliary camera decays, including: Based on the current fill light intensity of the main fill light, the maximum fill light intensity of the main fill light, and the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the main fill light decays for the preset time is determined. The target fill light brightness provided by the main fill light is determined based on the fill light intensity of the main fill light attenuated for a preset time, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light, the fill light brightness provided by the auxiliary fill light after attenuation, and the error coefficient of the main fill light in the monitoring environment and the calibration environment.

[0081] For example, in this embodiment of the application, in the operating mode, the second processing unit 403 is used to determine the target exposure amount corresponding to the auxiliary camera under the target photosensitivity value, including: When the working mode is night mode, the target fill light provided by the auxiliary fill light is determined based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay. The target exposure amount corresponding to the auxiliary camera is determined based on the target fill light brightness of the auxiliary fill light, the target photosensitivity value, and the lens aperture diameter of the auxiliary camera.

[0082] For example, in this embodiment of the application, the second processing unit 403 is used to determine the target fill light brightness provided by the auxiliary fill light based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay, including: Based on the current fill light intensity of the auxiliary fill light, the maximum fill light intensity of the auxiliary fill light, and the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the auxiliary fill light decays for the preset time is determined. The target supplementary light brightness provided by the auxiliary supplementary light is determined based on the supplementary light intensity provided by the auxiliary supplementary light after attenuation for a preset time, the proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, the rotation angle of the auxiliary supplementary light, the supplementary light brightness provided by the main supplementary light after attenuation, and the error coefficient of the auxiliary supplementary light in the monitoring environment and the calibration environment.

[0083] For example, in an embodiment of this application, the image capturing device 40 further includes: The third processing unit is used to determine the reference fill light brightness of the main fill light based on the reference exposure, the target photosensitive value, and the lens aperture diameter of the main camera when the light intensity attenuation rate determined based on the target fill light brightness provided by the main fill light and the historical target fill light brightness provided by the main fill light in the previous determination is greater than the light intensity attenuation rate threshold. The fourth processing unit is used to determine the correction error coefficient of the main fill light in the monitoring environment and the calibration environment based on the reference fill light brightness, the fill light brightness provided after the main fill light is attenuated, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light and the fill light brightness provided after the auxiliary fill light is attenuated. The updating unit is used to update the error coefficient of the main supplementary light in the monitoring environment and the calibration environment based on the correction error coefficient.

[0084] The image capturing device 40 provided in this application embodiment can execute the technical solution of the image capturing method in any of the above embodiments. Its implementation principle and beneficial effects are similar to those of the image capturing method. Please refer to the implementation principle and beneficial effects of the image capturing method. It will not be repeated here.

[0085] Figure 5 This is a schematic diagram of the physical structure of an electronic device provided in an embodiment of this application, such as... Figure 5 As shown, the electronic device may include a processor 510, a communications interface 520, a memory 530, and a communication bus 540, wherein the processor 510, communications interface 520, and memory 530 communicate with each other via the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute an image capture method, including: acquiring the target photosensitive value of the monitoring environment where the monitoring area is located; determining the operating mode of the monitoring device based on the target photosensitive value, the operating mode including a daytime mode or a nighttime mode; determining the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitive value in the operating mode; and controlling the main camera and the auxiliary camera to capture images of the monitoring area in the operating mode based on the target exposure amounts corresponding to the main camera and the auxiliary camera respectively.

[0086] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0087] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the image capture method provided by the above methods, including: acquiring the target photosensitivity value of the monitoring environment where the monitoring area is located; determining the working mode of the monitoring device based on the target photosensitivity value, the working mode including a daytime mode or a nighttime mode; determining the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitivity value in the working mode; and controlling the main camera and the auxiliary camera to capture images of the monitoring area in the working mode based on the target exposure amount corresponding to the main camera and the auxiliary camera respectively.

[0088] In another aspect, this application also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the image capture method provided by the above methods, including: acquiring the target photosensitivity value of the monitoring environment where the monitoring area is located; determining the operating mode of the monitoring device based on the target photosensitivity value, the operating mode including a daytime mode or a nighttime mode; determining the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitivity value in the operating mode; and controlling the main camera and the auxiliary camera to capture images of the monitoring area in the operating mode based on the target exposure amounts corresponding to the main camera and the auxiliary camera respectively.

[0089] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0090] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An image capturing method, characterized in that, Applied to surveillance equipment, the surveillance equipment including a main camera and an auxiliary camera, the method includes: Obtain the target photosensitivity value of the monitoring environment where the monitoring area is located; The operating mode of the monitoring device is determined based on the target photosensitivity value, and the operating mode includes a daytime mode or a nighttime mode. In the operating mode, the target exposure of the main camera and the auxiliary camera is determined respectively based on the target photosensitivity value; Based on the target exposure levels corresponding to the main camera and the auxiliary camera, the main camera and the auxiliary camera are respectively controlled to capture images of the monitored area in the working mode.

2. The method according to claim 1, characterized in that, In the operating mode, determining the target exposure of the auxiliary camera corresponding to the target photosensitivity value includes: When the working mode is daytime mode, the initial exposure of the auxiliary camera is determined based on the target photosensitivity value; Determine the target proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, wherein the overlapping area is the area where the monitoring area of ​​the main camera and the monitoring area of ​​the auxiliary camera overlap. The initial exposure is corrected based on the target proportion to obtain the target exposure corresponding to the auxiliary camera.

3. The method according to claim 1 or 2, characterized in that, In the operating mode, determining the target exposure of the main camera corresponding to the target light sensitivity value includes: When the working mode is night mode, the target fill light brightness provided by the main fill light is determined based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, and the fill light brightness provided by the auxiliary fill light of the auxiliary camera after decay. Based on the target fill light brightness provided by the main fill light, the target photosensitivity value, and the lens aperture diameter of the main camera, the target exposure corresponding to the main camera is determined.

4. The method according to claim 3, characterized in that, The determination of the target fill light brightness provided by the main fill light, based on the current fill light intensity of the main fill light of the main camera, the fill light brightness provided after a preset time of maximum brightness decay of the main fill light, and the fill light brightness provided after the decay of the auxiliary fill light of the auxiliary camera, includes: Based on the current fill light intensity of the main fill light, the maximum fill light intensity of the main fill light, and the fill light brightness provided after the maximum brightness of the main fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the main fill light decays for the preset time is determined. The target fill light brightness provided by the main fill light is determined based on the fill light intensity of the main fill light attenuated for a preset time, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light, the fill light brightness provided by the auxiliary fill light after attenuation, and the error coefficient of the main fill light in the monitoring environment and the calibration environment.

5. The method according to claim 1 or 2, characterized in that, In the operating mode, determining the target exposure of the auxiliary camera corresponding to the target photosensitivity value includes: When the working mode is night mode, the target fill light provided by the auxiliary fill light is determined based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay. The target exposure amount corresponding to the auxiliary camera is determined based on the target fill light brightness of the auxiliary fill light, the target photosensitivity value, and the lens aperture diameter of the auxiliary camera.

6. The method according to claim 5, characterized in that, The determination of the target fill light brightness provided by the auxiliary fill light, based on the current fill light intensity of the auxiliary fill light of the auxiliary camera, the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, and the fill light brightness provided by the main fill light of the main camera after decay, includes: Based on the current fill light intensity of the auxiliary fill light, the maximum fill light intensity of the auxiliary fill light, and the fill light brightness provided after the maximum brightness of the auxiliary fill light decays for a preset time, the fill light brightness provided after the current fill light intensity of the auxiliary fill light decays for the preset time is determined. The target supplementary light brightness provided by the auxiliary supplementary light is determined based on the supplementary light intensity provided by the auxiliary supplementary light after attenuation for a preset time, the proportion of the overlapping area in the monitoring area of ​​the auxiliary camera, the rotation angle of the auxiliary supplementary light, the supplementary light brightness provided by the main supplementary light after attenuation, and the error coefficient of the auxiliary supplementary light in the monitoring environment and the calibration environment.

7. The method according to claim 4, characterized in that, The method further includes: If the light intensity attenuation rate determined based on the target fill light brightness provided by the main fill light and the historical target fill light brightness provided by the main fill light previously determined is greater than the light intensity attenuation rate threshold, the reference fill light brightness of the main fill light is determined based on the reference exposure, the target photosensitive value and the lens aperture diameter of the main camera. Based on the reference fill light brightness, the fill light brightness provided after the main fill light is attenuated, the proportion of the overlapping area in the monitoring area of ​​the main camera, the rotation angle of the main fill light and the fill light brightness provided after the auxiliary fill light is attenuated, the correction error coefficient of the main fill light is determined in the monitoring environment and the calibration environment. Based on the correction error coefficient, the error coefficient of the main supplementary light is updated in the monitoring environment and the calibration environment.

8. An image capturing device, characterized in that, Applied to surveillance equipment, the surveillance equipment including a main camera and an auxiliary camera, the device includes: The acquisition unit is used to acquire the target photosensitivity value of the monitoring environment where the monitoring area is located. The first processing unit is used to determine the working mode of the monitoring device based on the target photosensitivity value, wherein the working mode includes a daytime mode or a nighttime mode. The second processing unit is used to determine the target exposure amount corresponding to the main camera and the auxiliary camera respectively based on the target photosensitivity value in the working mode. The control unit is used to control the main camera and the auxiliary camera to capture images of the monitored area in the working mode, based on the target exposure corresponding to the main camera and the auxiliary camera respectively.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the image capturing method as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the image capturing method as described in any one of claims 1 to 6.

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