WO2019192320A1 - 曝光方法、装置及摄像设备 - Google Patents

曝光方法、装置及摄像设备 Download PDF

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Publication number
WO2019192320A1
WO2019192320A1 PCT/CN2019/078901 CN2019078901W WO2019192320A1 WO 2019192320 A1 WO2019192320 A1 WO 2019192320A1 CN 2019078901 W CN2019078901 W CN 2019078901W WO 2019192320 A1 WO2019192320 A1 WO 2019192320A1
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WIPO (PCT)
Prior art keywords
brightness
current
fill light
exposure
input current
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PCT/CN2019/078901
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English (en)
French (fr)
Inventor
张国平
马伟民
尤灿
Original Assignee
杭州海康威视数字技术股份有限公司
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Publication of WO2019192320A1 publication Critical patent/WO2019192320A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components

Definitions

  • the present application relates to the field of imaging technology, and in particular, to an exposure method, device, and imaging apparatus.
  • Exposure is a control strategy that controls the brightness of the image of the captured image to achieve the target brightness by controlling the exposure parameters such as the aperture value, shutter speed, and gain value of the imaging device.
  • the target brightness is determined by the imaging device according to the ambient brightness.
  • the camera device usually also has a day/night switching function, and the camera can turn off the fill light during the day to shoot. When the light is below a certain level, the camera can automatically switch to night mode, that is, turn on the fill light to shoot.
  • the exposure function and the day/night switching function are performed independently.
  • the switching between the day and night shooting mode may affect the exposure effect, and in some specific scenes, the day/night shooting mode may be frequently switched.
  • the imaging device determines that the current shooting environment is dark and switches the day mode to the night mode
  • the sudden opening of the fill light may cause the shooting picture to be overexposed.
  • the camera device will switch to the night mode, and after switching to the night mode by turning on the fill light with maximum brightness, the narrow indoor space will be emitted to the fill light.
  • the light is reflected, so that the camera device detects a bright ambient brightness, and then switches to the day mode by turning off the fill light, and after switching to the day mode, the indoor space is darkened again, and the camera device switches to the night mode again.
  • the camera device switches to the night mode again.
  • the application provides an exposure method, device and imaging apparatus.
  • the technical solution is as follows:
  • an exposure method for use in an imaging apparatus, the method comprising:
  • the first ambient brightness refers to an ambient brightness before exposure, and the specified correspondence relationship stores a plurality of ambient brightnesses and target brightness corresponding to the plurality of ambient brightnesses respectively;
  • the adjustment of the exposure parameter is stopped, and the current adjustment command is triggered, and according to the a current adjustment command, the input current of the fill light is adjusted by a driving circuit of the fill light, so that the image brightness of the captured image approaches the first target brightness;
  • the compensation is stopped.
  • the adjustment of the input current of the light lamp which is determined according to the movement magnification information of the image pickup apparatus.
  • an embodiment of the present disclosure provides an exposure method, where the method includes:
  • the first ambient brightness refers to an ambient brightness before exposure, and the specified correspondence relationship stores a plurality of ambient brightnesses and target brightness corresponding to the plurality of ambient brightnesses respectively;
  • the adjustment of the exposure parameter is stopped, and the current adjustment command is triggered, and according to the a current adjustment command, the input current of the fill light is adjusted by a driving circuit of the fill light, so that the image brightness of the captured image approaches the first target brightness;
  • the exposure parameter during the exposure process may be acquired, and when the exposure parameter at a moment meets the exposure condition and the ambient brightness at the moment satisfies the brightness condition, the adjustment of the exposure parameter is stopped.
  • the input current of the fill light is then adjusted so that the exposure process can be coordinated with the control of the fill light. Since the fill light is turned off when the input current of the fill light is 0, when the input current of the fill light is greater than 0, the fill light is turned on, so the fill light can be controlled to be turned on by adjusting the input current of the fill light. shut down.
  • the opening and closing of the fill light is related to the day and night shooting mode of the image capturing device.
  • the image capturing device When the fill light is off, the image capturing device is in the day mode, and when the fill light is turned on, the image capturing device is in the night mode, so by adjusting the fill light
  • the input current can indirectly switch the day/night shooting mode, thereby achieving the coordination of the exposure process with the day and night switching process, and avoiding the influence of the sudden switching of the day/night shooting mode on the exposure effect when the two are separately performed.
  • the input current of the fill light is related to the light-emitting brightness of the fill light, the larger the input current is, the larger the light-emitting brightness is. Therefore, by adjusting the input current of the fill light during the exposure process, the fill light can also be controlled. The brightness of the light, so that the frequent switching of the day and night shooting mode caused by the excessive brightness of the fill light in a specific scene can be avoided.
  • FIG. 1 is a flowchart of an exposure method according to an embodiment of the present application
  • FIG. 2 is a flowchart of another exposure method according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a plurality of phase points corresponding to image exposure parameters applied in the process of adjusting the current of the fill light in FIG. 1 and FIG. 2 according to an embodiment of the present application.
  • the embodiment of the present application can be applied to a scene in which an imaging device is turned on and then photographed.
  • the imaging device can perform exposure according to the ambient brightness and switch between the day and night shooting mode, so that the imaging device can present a clear captured image.
  • the camera device is a device having a camera function.
  • the camera device in the embodiment of the present application may be a digital camera, a digital camera, a spherical camera (referred to as a ball machine), or a mobile terminal.
  • the mobile terminal may be a mobile phone or a tablet. Computer, etc.
  • the exposure method provided by the embodiment of the present application can be applied to solve the problem that the day and night shooting mode that is easy to occur is frequently switched in a scene such as a narrow indoor space or a camera shooting.
  • Other application scenarios can also be referred to by those skilled in the art.
  • the embodiment of the present application can coordinate the exposure process and the control of the fill light, so that during the exposure process, when the exposure parameter satisfies the exposure condition and the ambient brightness satisfies the brightness condition,
  • the input current of the fill light gradually reduces the light-emitting brightness of the fill light and is reduced to a suitable brightness, that is, it stops, which can solve the problem that the imaging device detects the indoor space after turning on the fill light with the maximum light-emitting brightness and switching to the night mode.
  • the large brightness of the reflection is switched back to the daytime mode, the frequent switching of the day/night shooting mode in the narrow indoor space is avoided.
  • the dome camera when the camera device is a dome camera, if the scene monitored by the dome camera during operation includes at least one low-brightness scene and at least one high-brightness scene, the dome camera needs to be photographed day and night during the monitoring process. Frequent switching of modes. For example, taking a low-brightness scene as an example near the window sill, when the dome machine is running near the window sill, since the brightness near the window sill is very low, it is necessary to turn on the fill light and need to switch to the night mode for shooting, when the dome machine is running high In the outdoor scene with brightness, the dome camera needs to switch to the day mode to turn off the fill light for shooting. Therefore, the dome machine needs to frequently switch between the day and night shooting mode during the shooting from the vicinity of the window sill to the outdoor shooting.
  • the exposure process and the control of the fill light can be coordinated, so that the fill light is only used when the exposure parameter satisfies the exposure condition and the ambient brightness satisfies the brightness condition.
  • the input current is adjusted, and the input current of the fill light can be adjusted to gradually increase or decrease the brightness of the fill light to a suitable brightness, thereby avoiding frequent switching of the day and night shooting mode during the operation of the ball machine. .
  • FIG. 1 is a flow chart of an exposure method provided by an embodiment of the present application. The method can be applied to an image pickup apparatus. As shown in FIG. 1 , the exposure method includes the following steps:
  • Step 101 Determine a first target brightness that the captured image needs to reach based on the first ambient brightness and the stored specified correspondence, and adjust an exposure parameter based on the first target brightness.
  • the first ambient brightness refers to an ambient brightness before exposure, and the specified correspondence relationship stores a plurality of ambient brightnesses and target brightnesses respectively corresponding to the plurality of ambient brightnesses.
  • Step 102 When adjusting the exposure parameter based on the first target brightness, and finding that the exposure parameter at a moment meets the exposure condition and the ambient brightness at the moment satisfies the brightness condition, stopping adjusting the exposure parameter, and triggering the current adjustment instruction, and according to The current adjustment command adjusts the input current of the fill lamp by the drive circuit of the fill lamp.
  • the adjustment of the exposure parameter is stopped, and the current ambient brightness is acquired; when the acquired current ambient brightness satisfies the brightness condition, the current adjustment instruction is triggered.
  • Step 103 When the input current of the fill light is adjusted, it is found that when the difference between the image brightness of the image captured at a time and the first target brightness is not greater than the preset tolerance threshold, the compensation is stopped. Adjustment of the input current of the light.
  • the specified current is determined according to the movement magnification information of the imaging device.
  • the embodiment of the present application further provides an exposure method, including the following steps:
  • the first ambient brightness refers to the ambient brightness before the exposure, and the specified relationship stores the target brightness corresponding to the plurality of ambient brightnesses and the plurality of ambient brightnesses respectively;
  • the adjustment of the exposure parameter is stopped, and the current adjustment command is triggered, and according to the current adjustment instruction, Adjusting the input current of the fill light by the driving circuit of the fill light, so that the image brightness of the captured image approaches the first target brightness;
  • the exposure parameter during the exposure process may be acquired, and when the exposure parameter at a moment meets the exposure condition and the ambient brightness at the moment satisfies the brightness condition, the adjustment of the exposure parameter is stopped.
  • the input current of the fill light is then adjusted so that the exposure process can be coordinated with the control of the fill light. Since the fill light is turned off when the input current of the fill light is 0, when the input current of the fill light is greater than 0, the fill light is turned on, so the fill light can be controlled to be turned on by adjusting the input current of the fill light. shut down.
  • the opening and closing of the fill light is related to the day and night shooting mode of the image capturing device.
  • the image capturing device When the fill light is off, the image capturing device is in the day mode, and when the fill light is turned on, the image capturing device is in the night mode, so by adjusting the fill light
  • the input current can indirectly switch the day/night shooting mode, thereby achieving the coordination of the exposure process with the day and night switching process, and avoiding the influence of the sudden switching of the day/night shooting mode on the exposure effect when the two are separately performed.
  • the input current of the fill light is related to the light-emitting brightness of the fill light, the larger the input current is, the larger the light-emitting brightness is. Therefore, by adjusting the input current of the fill light during the exposure process, the fill light can also be controlled. The brightness of the light, so that the frequent switching of the day and night shooting mode caused by the excessive brightness of the fill light in a specific scene can be avoided.
  • the method further includes:
  • the third ambient brightness is acquired every first preset time period
  • the first target brightness of the exposure is switched to the second target brightness, and the exposure parameter is adjusted based on the second target brightness.
  • the exposure parameter includes an aperture value, a shutter speed, and a gain value
  • the exposure parameter is adjusted based on the first target brightness
  • the aperture value, the shutter speed, and the gain value at a moment are not less than the first preset aperture value, respectively. Determining a shutter speed and a first preset gain value, determining that an exposure parameter at a time of discovery satisfies the exposure condition;
  • the current adjustment command is triggered, and according to the current adjustment command, the input current of the fill light is adjusted by the driving circuit of the fill light, including:
  • the first adjustment instruction is used to indicate increasing the input of the fill light Current
  • the input current of the fill lamp is increased by the drive circuit of the fill lamp.
  • the exposure parameter includes an aperture value, a shutter speed, and a gain value
  • the day/night shooting mode of the imaging device is the night mode, and the exposure parameter is adjusted based on the first target brightness, it is found that the aperture value, the shutter speed, and the gain value at one moment are not greater than the second preset aperture value, and the second Determining the shutter speed and the second preset gain value, determining that the exposure parameter of the found moment meets the exposure condition, and the second preset aperture value, the second preset shutter speed, and the second preset gain value are respectively smaller than the first a preset aperture value, a first preset shutter speed, and a first preset gain value;
  • the current adjustment command is triggered, and according to the current adjustment instruction, the input current of the fill light is adjusted by the driving circuit of the fill light, including:
  • the second adjustment instruction is used to indicate that the input of the fill light is reduced.
  • the input current of the fill lamp is reduced by the drive circuit of the fill lamp.
  • the method before the trigger current adjustment instruction, the method further includes:
  • the step of triggering the current adjustment command is performed when it is determined based on the movement magnification information that the imaging apparatus is not in the zooming process.
  • the method before the trigger current adjustment instruction, the method further includes:
  • the step of executing the trigger current adjustment instruction when the triggered number of times is less than a preset number of times threshold
  • the method further includes:
  • the number of times the trigger has been added is N, including:
  • the number of triggered times is increased by N.
  • the determining, by the first time point that the current adjustment instruction is currently triggered, and the second time point of the last time the current adjustment instruction is triggered before the first time point further includes:
  • the triggered number of times is cleared.
  • the method further includes:
  • the maintenance duration is not less than the third preset duration, the number of triggered times is cleared.
  • FIG. 2 is a flow chart of another exposure method provided by an embodiment of the present application.
  • the method can be applied to an image pickup apparatus.
  • the exposure method includes the following steps.
  • Step 201 Determine a first target brightness that the captured image needs to reach based on the first ambient brightness and the stored specified correspondence, and adjust the exposure parameter based on the first target brightness.
  • the first ambient brightness refers to an ambient brightness before exposure, and the specified correspondence relationship stores a plurality of ambient brightnesses and target brightnesses respectively corresponding to the plurality of ambient brightnesses.
  • the ambient brightness is usually constantly changing, and the change of the ambient brightness will affect the brightness of the image of the captured image, thereby affecting the sharpness of the captured image. Therefore, in order to ensure that the imaging device is Under different ambient brightness, it can present a clearer captured image.
  • the camera device can continuously expose during shooting. Exposure refers to adjusting the brightness of the captured image by adjusting the exposure parameters.
  • the imaging device may acquire the ambient brightness in real time or periodically during the shooting process, and use the acquired ambient brightness as the first ambient brightness, and each time the first ambient brightness is acquired, based on the acquired first ambient brightness. Determining a first target brightness that the captured image needs to reach, and performing exposure based on the first target brightness.
  • Each of the exposure processes may be processed in the manner of step 201-step 207.
  • the embodiment of the present application determines the first target brightness based on the first ambient brightness acquired at one time, and performs exposure based on the first target brightness.
  • the exposure process is described as an example.
  • the first ambient brightness refers to the brightness of the shooting scene in which the imaging device is located during the shooting process
  • the first target brightness refers to the image brightness that the image captured by the imaging device needs to reach under the first ambient brightness, only when When the brightness of the image of the captured image approaches or reaches the first target brightness, the captured image can exhibit sufficient sharpness.
  • the image brightness of the captured image may be an average value of the brightness of the captured image.
  • Exposing based on the first target brightness refers to adjusting the exposure parameter based on the first target brightness to control the exposure amount by adjusting the exposure parameter, thereby gradually bringing the brightness of the captured image closer to the first target brightness.
  • the first ambient brightness may be compared with the first target brightness, and the difference between the first ambient brightness and the first target brightness may be first.
  • the exposure parameter is adjusted based on the first target brightness.
  • the difference between the first ambient brightness and the first target brightness is not greater than the preset tolerance threshold, exposure may not be performed.
  • the preset tolerance threshold is used to indicate an error range that the image brightness can tolerate, and the preset tolerance threshold may be preset, which may be set by default by the camera device, or may be customized by the user. There is no limit to this.
  • the preset tolerance threshold may be 0 cd/m, 2 cd/m, or 5 cd/m.
  • the difference between the first ambient brightness and the first target brightness is not greater than the preset tolerance threshold, the difference between the first ambient brightness and the first target brightness is small, that is, the first ambient brightness has approached or reached the first target. Brightness, in this case, the exposure may not be performed, that is, the exposure parameters are not adjusted.
  • the imaging device can determine the first ambient brightness by capturing an image. For example, the imaging apparatus may calculate an average value of the brightness of each pixel point in the captured image, and then use the average value of the brightness as the first ambient brightness.
  • the camera device can also determine the first ambient brightness by other means, such as obtaining the first ambient brightness by using the installed light sensor, which is not limited herein.
  • the determining, according to the first ambient brightness and the stored specified correspondence, the operation of determining the first target brightness that the captured image needs to reach may include: determining, from the stored specified correspondence, the target brightness corresponding to the first ambient brightness, The target brightness corresponding to an ambient brightness is determined as the first target brightness.
  • the specified correspondence relationship stores a plurality of different ambient brightnesses set in advance and target brightness corresponding to the plurality of different ambient brightnesses respectively.
  • the corresponding target brightness can be set to 100 cd/m (candela/m2), and a certain brightness obtained for nighttime is 90 cd.
  • the ambient brightness of /m, the corresponding target brightness can be set to 95cd/m, and so on.
  • the corresponding relationship between the ambient brightness and the target brightness is pre-stored in the memory of the image capturing device, and the target brightness corresponding to the brightness of the different environments can be quickly searched according to the corresponding relationship, thereby determining the first ambient brightness acquired in different environments.
  • Corresponding first target brightness may be customized, and the target brightness corresponding to each ambient brightness may also be a custom setting.
  • the target brightness corresponding to different ambient brightness presets may be a preferred brightness that can be determined according to experience and can ensure image clarity in an actual use environment.
  • the imaging device generally performs exposure by adjusting the exposure parameters, and the exposure parameters are usually adjusted by gradually increasing the exposure parameters or gradually decreasing the exposure parameters. That is, in the process in which the imaging apparatus adjusts the exposure based on the first target brightness, the imaging apparatus will gradually increase or decrease the exposure parameter.
  • the imaging device adjusts the exposure parameter based on the first target brightness
  • the imaging device if the first ambient brightness is less than the first target brightness, and the difference between the first target brightness and the first target brightness is greater than the first preset tolerance threshold, in order to improve the image Brightness, the imaging device will increase the exposure parameter; if the first ambient brightness is greater than the first target brightness, and the difference between the first target brightness and the first target brightness is greater than the second preset tolerance threshold, in order to reduce the image brightness, the camera The device will reduce the exposure parameters.
  • the first preset tolerance threshold and the second preset tolerance threshold may be the same or different, and are not limited herein.
  • the exposure parameters usually include three parameters of aperture value, shutter speed and gain value.
  • the aperture value is used to indicate the size of the aperture, and can indicate the amount of light passing through the lens of the imaging device.
  • the aperture is located inside the lens, and is a device for controlling the surface of the photosensitive component that the light passes through the lens into the body. The larger the aperture, The larger the amount of light passing through the lens.
  • the shutter speed is used to indicate the start time of the shutter and to determine the length of the exposure time.
  • the gain value is the gain value of the photosensitive component and is used to indicate the current amplification factor of the photosensitive component. By increasing the gain value, the brightness of the captured image can be improved.
  • the three parameters of the aperture value, the shutter speed, and the gain value may be separately adjusted. Specifically, increasing the exposure parameter includes increasing the aperture value, the shutter speed, and the gain value, respectively, and decreasing the exposure parameter includes decreasing the aperture value, the shutter speed, and the gain value, respectively.
  • the imaging apparatus may also gradually adjust the exposure parameters based on the first target brightness, such as gradually increasing the exposure parameter or gradually decreasing the exposure parameter.
  • Gradually increasing the exposure parameters includes gradually increasing the aperture value, the shutter speed, and the gain value, respectively
  • gradually decreasing the exposure parameters includes gradually decreasing the aperture value, the shutter speed, and the gain value, respectively.
  • the operation of gradually increasing the exposure parameter may be: linearly increasing the exposure parameter in time series, or increasing the exposure parameter every specific time period, increasing the preset value each time, and the like.
  • the operation of gradually decreasing the exposure parameter may be: linearly reducing the exposure parameter in time series, or decreasing the exposure parameter every specific time period, decreasing the preset value each time, and the like.
  • the preset value added each time and the preset value reduced each time may be customized, and the preset value added each time may be the same as the preset value of each decrease, or may be different.
  • Step 202 When the exposure parameter is adjusted based on the first target brightness, when it is found that the exposure parameter at a moment meets the exposure condition, the adjustment of the exposure parameter is stopped, and the current ambient brightness is acquired.
  • the imaging device may acquire the exposure parameter in real time or periodically during the process of adjusting the exposure parameter based on the first target brightness.
  • an exposure parameter When an exposure parameter is acquired, it may first determine whether the acquired exposure parameter is satisfied. Preset conditions. When the acquired exposure parameter does not satisfy the preset condition, the exposure parameter of the next moment is continuously obtained; when the exposure parameter acquired at a certain moment satisfies the preset condition, the ambient brightness at the moment is acquired.
  • the preset condition is the preset exposure condition.
  • the exposure condition may be set according to a day/night shooting mode, that is, different day and night shooting modes may correspondingly set different exposure conditions, and accordingly, determining whether the exposure parameter at any one time satisfies the preset condition may include the following two Ways.
  • the first way determining the day/night shooting mode of the imaging device, when the day/night shooting mode of the imaging device is the day mode, and during the exposure based on the first target brightness, it is found that the aperture value, the shutter speed and the gain value at one moment are not respectively When it is smaller than the first preset aperture value, the first preset shutter speed, and the first preset gain value, it is determined that the exposure parameter of the found moment satisfies the exposure condition.
  • the first preset aperture value, the first preset shutter speed, and the first preset gain value are respectively preset aperture values, shutter speeds, and gain values.
  • Day mode refers to the shooting mode in which the fill light is off.
  • the imaging device may also automatically activate the infrared filter to filter the infrared rays through the infrared filter.
  • the imaging device adjusts the aperture value in the exposure parameter to be not less than the first preset aperture value, shutter at any time.
  • the speed is adjusted to be not less than the first preset shutter speed, and the gain value is adjusted to be not less than the first preset gain value, it is determined that the exposure parameter at the moment satisfies the exposure condition.
  • the imaging device when the imaging device is in the daytime mode, because the fill light is off, it may not be able to provide sufficient brightness to the shooting environment.
  • the first ambient brightness acquired at a certain time is less than the first target brightness, and
  • the imaging device will perform exposure based on the first target brightness by gradually increasing the exposure parameter to increase the amount of light entering the imaging device, so that the brightness of the captured image is gradually increased. Approaching the first target brightness.
  • the imaging device when the imaging device is in the day mode, and the current shooting environment provides excessive brightness, the first ambient brightness acquired at a certain time is greater than the first target brightness, and the difference from the first target brightness
  • the imaging device will perform exposure by gradually reducing the exposure parameter based on the first target brightness to reduce the amount of light entering the imaging device, so that the brightness of the captured image gradually approaches the first target brightness.
  • the exposure parameter at the determined time meets the exposure condition.
  • the first designated phase point is selected from a plurality of preset phase points, and the corresponding aperture value, shutter speed, and gain value are respectively a first preset aperture value, a first preset shutter speed, and a first The phase point of the preset gain value.
  • the plurality of phase points are in one-to-one correspondence with a plurality of different exposure parameters, and the plurality of phase points refer to a plurality of adjustment nodes of the exposure parameter, and during the exposure process of the imaging device, the exposure parameters are according to the corresponding exposure parameters The order of the size is adjusted sequentially between the multiple phase points.
  • the plurality of phase points may be pre-defined according to the type of the aperture component and the photosensitive component of the imaging device, and in order to achieve an optimal image effect, each phase point is determined in the actual use environment. Better exposure parameters.
  • a plurality of exposure parameters may be selected in advance from an exposure parameter range that can be adjusted by the imaging device, and the selected plurality of exposure parameters are taken as a plurality of phase points, and the order of the corresponding exposure parameters is from small to large,
  • the plurality of phase points are sorted, and then exposure is performed by sequentially increasing the phase points or decreasing the phase points.
  • sequentially increasing the phase points the exposure parameters can be gradually increased, and by sequentially reducing the phase points, the exposure parameters can be gradually reduced.
  • the exposure parameter range of the image pickup apparatus includes 13 stage points, and from the stage point 1 to the stage point 13, the corresponding aperture value, shutter speed, and gain value are gradually increased.
  • the aperture value corresponding to the phase point 1 is the minimum aperture value PwmMin
  • the corresponding shutter speed is the minimum shutter speed ShuMin
  • the corresponding gain value is 0
  • the aperture value corresponding to the phase point 13 is the maximum aperture value PwmMax
  • corresponding to The shutter speed is the maximum shutter speed ShuMax
  • the corresponding gain value is the maximum gain value AgcMax.
  • the imaging apparatus can determine that the exposure parameter satisfies the preset condition, that is, the exposure condition, when the phase point corresponding to the exposure parameter is adjusted to be not less than the phase point 12.
  • the exposure parameter range of the imaging device includes multiple phase points.
  • the imaging device may perform exposure by increasing the phase point corresponding to the exposure parameter based on the first target brightness.
  • the exposure parameter range of the imaging apparatus includes the above 13 stage points, and the first designated stage point is the stage point 12, in a process in which the imaging apparatus sequentially increases from the stage point 1, when a certain moment When the point is increased to the stage point 12, it can be determined that the exposure parameter at the moment satisfies the preset condition, that is, the exposure condition is satisfied.
  • the second way determining the day/night shooting mode of the imaging device, when the day/night shooting mode of the imaging device is the night mode, and adjusting the exposure based on the first target brightness, it is found that the aperture value, the shutter speed and the gain value at one moment are not respectively When the second preset aperture value, the second preset shutter speed, and the second preset gain value are greater than, the exposure parameter of the found moment is determined to satisfy the exposure condition.
  • the second preset aperture value, the second preset shutter speed, and the second preset gain value are preset aperture values, shutter speeds, and gain values, respectively, and the second preset aperture value and the second preset shutter speed. And the second preset gain value is smaller than the first preset aperture value, the first preset shutter speed, and the first preset gain value, respectively.
  • Night mode refers to the shooting mode in which the fill light is on.
  • the imaging device may also cancel the enabled infrared filter to allow infrared rays to enter the photosensitive component of the imaging device.
  • the imaging device adjusts the aperture value in the exposure parameter to be no greater than the second preset aperture value, shutter at any time.
  • the speed is adjusted to be not greater than the second preset shutter speed and the gain value is adjusted to be not greater than the second preset gain value, it is determined that the exposure parameter at any one of the times satisfies the exposure condition.
  • the imaging device when the imaging device is shooting in the night mode, the fill light is turned on, and the brightness of the shooting environment can be supplemented, but the brightness of the fill light may be too large, and the brightness of the first environment acquired at a certain time is greater than
  • the imaging device will perform exposure by reducing the exposure parameter based on the first target brightness. By reducing the exposure parameter, the amount of light entering the imaging device can be reduced, thereby reducing the brightness of the captured image, so that the brightness of the captured image gradually approaches the first target brightness.
  • the imaging device when the imaging device is in the night mode and the brightness provided by the fill light is insufficient, the first ambient brightness acquired at a certain time is less than the first target brightness, and the difference between the first target brightness and the first target brightness is greater than
  • the imaging device will perform exposure by gradually increasing the exposure parameter based on the first target brightness to increase the amount of light entering the imaging device, so that the brightness of the captured image gradually approaches the first target brightness.
  • the exposure parameter at the determined time meets the exposure condition.
  • the second designated phase point is selected from a plurality of preset phase points, and the corresponding aperture value, shutter speed, and gain value are respectively a second preset aperture value, a second preset shutter speed, and a second The phase point of the preset gain value.
  • the imaging device may determine that the exposure parameter meets the preset condition when the phase point corresponding to the exposure parameter is adjusted to be not greater than the phase point 11
  • the condition is the exposure condition.
  • the exposure parameter range of the imaging device includes multiple phase points
  • the brightness of the fill light may be too large, and the first ambient brightness acquired at a certain time is greater than the first.
  • the imaging apparatus needs to perform exposure by reducing the phase point corresponding to the exposure parameter based on the first target brightness. For example, assuming that the exposure parameter range of the imaging apparatus includes the above 13 stage points, and the second designated stage point is the stage point 11, the imaging apparatus may be in a process of decreasing from the stage point 13 in a timely manner.
  • the phase point is reduced to the phase point 11 it is determined that the exposure parameter at the moment satisfies the preset condition, that is, the exposure condition is satisfied.
  • Step 203 When the acquired current ambient brightness meets the brightness condition, trigger a current adjustment instruction, and according to the current adjustment instruction, adjust an input current of the fill light through a driving circuit of the fill light to make the captured image.
  • the brightness of the image approaches the first target brightness.
  • the input current of the fill light can be used to control the brightness of the fill light.
  • the input current of the fill light is proportional to the light-emitting brightness of the fill light, and the larger the input current of the fill light is, the larger the light-emitting brightness is, and the smaller the input current is, the smaller the light-emitting brightness is.
  • the input current of the fill light can also be used to control the on and off of the fill light. When the input current of the fill light is 0, the fill light is turned off. When the input current of the fill light is greater than 0, the fill light is added. The light is on.
  • the opening and closing of the fill light is related to the day/night shooting mode of the image capturing device, when the fill light is turned off, the image capturing device is in the day mode, and when the fill light is turned on, the image capturing device is in the night mode, so by adjusting the fill light
  • the input current can indirectly switch between day and night shooting modes.
  • the current adjustment instruction is triggered to adjust according to the current adjustment instruction.
  • the input current of the fill light changes the light-emitting brightness of the fill light, so that the control of the light-emitting brightness of the fill light can be further combined on the basis of the exposure, so that the image brightness of the captured image can quickly reach the first target brightness.
  • the input current of the fill light is adjusted, and the brightness of the fill light can be controlled to avoid excessive brightness of the fill light in a specific scene. Frequent switching of day and night shooting modes. Moreover, since the input and output current of the fill light can be adjusted to indirectly switch between the day and night shooting mode, the adjustment of the exposure process and the day and night switching process can be realized by adjusting the input current of the fill light during the exposure process, thereby avoiding two The effect of the sudden switching of the day/night shooting mode on the exposure effect is performed separately.
  • adjusting the input current of the fill light includes increasing the input current of the fill light or reducing the input current of the fill light.
  • the light-emitting brightness of the fill light can be gradually adjusted by the driving circuit of the fill light, such as gradually increasing the input current of the fill light, or gradually reducing the input current of the fill light.
  • gradually increasing the input current of the fill light it is possible to control the brightness of the fill light to gradually increase, that is, the fill light is getting brighter and brighter; by reducing the input current of the fill light, the brightness of the fill light can be controlled. Gradually become smaller, that is, the fill light is getting darker and darker.
  • gradually increasing the input current of the fill light may include: linearly increasing the input current of the fill light in time series, or increasing the input current of the fill light every certain time period, each time increasing the preset The size of the current, etc.
  • Gradually reducing the input current of the fill light may include: linearly reducing the input current of the fill light in chronological order, or reducing the input current of the fill light every certain time period, reducing the current of the preset size each time. Wait.
  • the brightness conditions may be different according to different day and night shooting modes.
  • the brightness condition when the imaging device is in the daytime mode, the brightness condition may be a condition that the acquired current ambient brightness is less than the first brightness threshold.
  • the brightness condition When the imaging device is in the night mode, the brightness condition may be that the acquired current ambient brightness is greater than The condition of the second brightness threshold.
  • the first brightness threshold and the second brightness threshold may be set in advance, and the two may be the same or different.
  • the first brightness threshold and the second brightness threshold may both be the first target brightness.
  • step 203 may include the following two implementation manners.
  • the first implementation manner is: when it is determined by the first manner that the exposure parameter satisfies the exposure condition, and the current ambient brightness is obtained, the obtained current ambient brightness is compared with the first brightness threshold, when the current current acquired is obtained. When the ambient brightness is less than the first brightness threshold, determining that the acquired current ambient brightness meets the brightness condition, and triggering the first adjustment instruction, according to the first adjustment instruction, increasing the input current of the fill light by the driving circuit of the fill light .
  • the first adjustment instruction is used to indicate that the input current of the fill light is increased.
  • the imaging device can gradually increase the input current of the fill light by the driving circuit of the fill light according to the first adjustment command. For example, the input current of the fill light is linearly increased in chronological order, or the input current of the fill light is increased once every certain time period, and the current of a preset size is increased each time.
  • the input current of the fill light will increase from 0 when the input current of the fill light is increased.
  • the fill light can be turned on, thereby switching the camera device from day mode to night mode, and as the input current continues to increase, the fill light The brightness of the light will also gradually increase.
  • the fill light of the imaging device is turned off, during the exposure process of the imaging device based on the first target brightness, when the exposure parameter and the current environment acquired are obtained.
  • the first adjustment command may be triggered, and the input current of the fill light is increased according to the first current adjustment command, and the input current of the fill light is increased, and the fill current can be turned on.
  • the light lamp switches the imaging device from the day mode to the night mode, and can gradually increase the brightness of the fill light.
  • the fill light is turned on, and the light-emitting brightness of the fill light is gradually increased.
  • the image capturing device can be switched from the day mode to the night mode, and the shooting environment can be supplemented by the fill light.
  • the brightness of the image of the captured image can avoid the frequent switching of the overexposure or day/night shooting mode caused by the excessive brightness of the fill light when the fill light is turned on at the maximum brightness in the related art.
  • the fill light can be an infrared light, a white light, a mixed light, or a laser light.
  • the embodiment of the present application does not limit this.
  • an instruction to cancel the color filter can also be triggered.
  • the second implementation manner is: when the exposure parameter is determined to satisfy the exposure condition by the second manner, and the current ambient brightness is obtained, the acquired current ambient brightness is compared with the second brightness threshold, when the current current acquired is obtained.
  • the ambient brightness is greater than the second brightness threshold, determining that the acquired current ambient brightness satisfies the brightness condition, and triggering a second adjustment instruction, according to the second adjustment instruction, reducing the input current of the fill light by the driving circuit of the fill light .
  • the second adjustment command is used to indicate that the input current of the fill light is reduced.
  • the imaging device may gradually reduce the input current of the fill light by the driving circuit of the fill light according to the second adjustment instruction. For example, the input current of the fill light is linearly reduced in chronological order, or the input current of the fill light is decreased once every certain period of time, and the current of a preset size is reduced each time.
  • the input current of the fill light is greater than 0. Therefore, when the input current of the fill light is reduced, the brightness of the fill light decreases with the decrease of the input current. It will also decrease. When the input current of the fill light is reduced to 0, the fill light will be turned off, thus switching the camera from night mode to day mode.
  • the fill light of the imaging device is turned on, during the exposure process of the imaging device based on the first target brightness, when the exposure parameter and the current environment acquired are obtained.
  • the second adjustment command may be triggered, and the input current of the fill light is reduced according to the second adjustment command, thereby gradually reducing the brightness of the fill light, and when the fill light is added
  • the input current of the lamp is reduced to 0, it is also possible to switch the imaging device from the night mode to the day mode.
  • the image brightness of the captured image can be reduced, and even the imaging device can be switched from the night mode to the day mode, and on the other hand, Directly turn off the brightness caused by the brightness of the fill light or the frequent switching of the day/night shooting mode.
  • an instruction for instructing the infrared filter to be activated may be triggered, thereby enabling the infrared filter to filter the infrared.
  • the triggered number of the current adjustment instruction may be first determined, and when the triggered number is less than the preset number of times, the trigger current adjustment instruction is executed. step.
  • the triggered number is obtained by accumulating the triggered current adjustment command.
  • the accumulated starting point is accumulated from the time when the camera device is turned on, and the triggered number of times is cleared when the camera device is turned on. In the case of the situation, the accumulation is restarted after being cleared.
  • the current adjustment command includes the first adjustment instruction and the second adjustment instruction.
  • the preset number of times thresholds may be preset, and may be set by default by the camera device, or may be customized by the user, which is not limited by the embodiment of the present application.
  • the preset number threshold is used to indicate an upper threshold that frequently triggers the current adjustment command. When the triggered number is less than the preset number of thresholds, it indicates that the current adjustment command has not been triggered frequently, when the triggered number is not less than
  • the preset number of thresholds indicates that the current adjustment command has been frequently triggered.
  • the preset number of thresholds may be 2, 3, 5, or 10 times, and the like.
  • each time the current adjustment instruction is triggered the number of times the current adjustment instruction is triggered may be accumulated to count the number of times the adjustment instruction has been triggered.
  • the triggered number of the current adjustment command may be determined first, and when the triggered number is less than the preset number of times threshold, the current adjustment instruction is triggered.
  • the number of triggered times can also be increased by N to achieve the accumulation of the triggered times.
  • the N is a positive integer. In the actual application, the value of the N is usually 1 and may be other values.
  • the first time point at which the current adjustment command is currently triggered may be determined first, and the second time point at which the current adjustment command is triggered last time before the first time point,
  • the length of time between the first time point and the second time point is not greater than the second preset time length, the number of triggered times is further increased by N.
  • the second preset duration is a preset duration for indicating that the current adjustment command is frequently triggered, and the second preset duration may be a custom setting. In a practical application, the second preset duration may be generally set to a shorter duration. For example, the second preset duration may be 5 min, 10 min, or 30 min.
  • the trigger time interval between the time when the current adjustment command is currently triggered and the time when the current adjustment command is triggered may be determined first, when the trigger time interval is not greater than the second preset duration.
  • the number of triggered times may be added by adding the number of triggered times to the number of triggered times, and then the time period of the second preset time period is The number of adjustments is counted.
  • the number of triggered times may also be cleared.
  • the distance between the first time point and the second time point is greater than the second preset time length, it can be considered that the two consecutive triggers are normal, that is, not in the frequent adjustment situation, and the number of triggered times can be cleared. Zero, to avoid statistics on the number of adjustments in the normal adjustment situation.
  • the shooting environment undergoes a day-to-night transition, or a transition from night to day, under these two transition conditions.
  • the adjustment in these two cases is an adjustment under normal conditions, and the number of adjustments may not be counted.
  • the camera magnification information of the camera device may be acquired first, and the movement magnification information may be used to indicate the zoom of the camera device.
  • the information may indicate whether the imaging device is currently in a zooming process; when it is determined that the imaging device is not in the zooming process based on the movement magnification information, the step of triggering the current adjustment command is performed.
  • the current adjustment instruction may not be triggered.
  • the imaging device changes the shooting range during the zooming process, it may switch from a low-brightness scene to a high-brightness scene, or from a high-brightness scene to a low-brightness scene, resulting in frequent switching of the day/night shooting mode during the zooming process. Therefore, in the embodiment of the present application, the current adjustment command can be controlled by the image capturing device during the zooming process to avoid adjusting the input current of the fill light during the zooming process, thereby avoiding frequent switching of the day/night shooting mode. For example, when the camera device is a dome camera, frequent switching of the day/night shooting mode during the operation of the dome camera through zooming can be avoided.
  • the current input current of the fill light may be maintained unchanged, that is, the step of triggering the current adjustment command is not performed, and the last time may be The time point at which the current adjustment command is triggered determines the duration of the current input current of the fill light.
  • the maintenance time is not less than the third preset time, the number of triggered times is cleared.
  • the day/night shooting mode may be switched multiple times, so in order to avoid frequent switching of the day/night shooting mode,
  • the current adjustment command for adjusting the input current of the fill lamp may not be triggered to maintain the current input current of the fill light.
  • the length of time between the current time and the time point of the most recent trigger current adjustment command may be used as the maintenance duration. Specifically, when the adjustment command is triggered most recently, the counter starts counting, and the duration of the input current of the fill lamp is determined according to the timer duration of the timer.
  • the third preset duration may be preset, and the third preset duration may be a custom setting.
  • the third preset duration may be 2 min, 5 min, 10 min, or 30 min, etc., in the embodiment of the present application.
  • the specific duration of the third preset duration is not limited.
  • the input current of the fill light is maintained for a long time, and the adjustment command of the input current of the fill light is not triggered, thereby preventing frequent switching of the input current of the fill light, and indirectly The frequent switching of the day and night shooting mode is prevented, so that the oscillating can be prevented.
  • the camera device can be restored to the normal mode, that is, according to the embodiment of the present application.
  • the adjustment strategy adjusts the input current of the fill light.
  • the embodiment of the present application is only an example of triggering a current adjustment command when the current ambient brightness obtained meets the brightness condition.
  • the trigger may not be triggered.
  • the current adjustment command continues to perform exposure based on the first target brightness, that is, the exposure parameter is continuously adjusted based on the first target brightness.
  • Step 204 Acquire a third ambient brightness every first preset time period during the adjustment of the input current of the fill light.
  • the first preset duration may be preset, and may be set by default by the camera device, or may be customized by the user, which is not limited in this embodiment of the present application.
  • the length of the input current of the fill light is usually very short, so the first preset duration can also be set to a very short duration.
  • the first preset duration can be 0.1 s. 0.5s or 1s, etc.
  • Step 205 Determine, when the third ambient brightness is acquired, the second target brightness that the captured image needs to reach according to the acquired third ambient brightness and the specified correspondence.
  • the step 205 is to determine, according to the acquired third ambient brightness and the specified correspondence relationship, a second target brightness mode that the captured image needs to reach, and determining, according to the first environment brightness and the designated correspondence relationship in the foregoing step 201, that the captured image is needed.
  • the first target brightness is achieved in the same manner.
  • Step 206 Switch the first target brightness of the exposure to the second target brightness, and adjust the exposure parameter based on the second target brightness.
  • the embodiment of the present application may further acquire a third ambient brightness every first preset time period during the adjustment of the input current of the fill light, and according to the acquired third ambient brightness and the Specifying a correspondence relationship, determining a second target brightness that the captured image needs to reach, switching the first target brightness that was previously exposed to the second target brightness, and continuing to perform exposure based on the second target brightness to control the exposure amount by adjusting the exposure parameter, Further, the brightness of the captured image gradually approaches the second target brightness.
  • adjusting the exposure parameter based on the second target brightness includes: increasing the exposure when the third ambient brightness is less than the third ambient brightness and the difference between the third ambient brightness and the third ambient brightness is greater than the preset tolerance threshold And decreasing the exposure parameter when the third ambient brightness is greater than the third ambient brightness and the difference between the third ambient brightness and the third ambient brightness is greater than the preset tolerance threshold.
  • Steps 204-206 are optional steps.
  • the purpose of steps 204-206 is to continue the exposure based on the actual ambient brightness during the current adjustment process while adjusting the input current of the fill light to prevent the fill light.
  • the captured image is overexposed or too dark, thereby further improving the exposure effect.
  • Step 207 During the adjustment of the input current of the fill light, when a certain condition is reached, the adjustment of the input current of the fill light can be stopped, and the specified current is determined according to the movement magnification information of the imaging device. .
  • the first implementation manner stopping the adjustment of the input current of the fill light according to the first target brightness.
  • the purpose of adjusting the input current of the fill light is to quickly bring the image brightness of the captured image closer to the first target brightness in combination with the control of the fill light, so that the input of the fill light can be stopped according to the first target brightness. Current adjustment.
  • stopping the adjustment of the input current of the fill light comprises: determining the image brightness of the captured image in real time or periodically during the adjustment of the input current of the fill light; When it is found that the difference between the image brightness of the image captured at a certain moment and the first target brightness is not greater than the preset tolerance threshold, the adjustment of the input current of the fill light is stopped.
  • the second implementation manner stopping the adjustment of the input current of the fill light according to the movement magnification information and the first target brightness.
  • the movement magnification information of the imaging device may be acquired, and the movement magnification of the imaging device may be obtained from the movement magnification information, according to the movement magnification information.
  • the pre-stored correspondence between the movement magnification and the current can determine the current corresponding to the movement magnification in the movement magnification information, the current is the specified current, and then stops according to the specified current and the first target brightness.
  • the specified current is the maximum input current that the fill light can determine according to the movement magnification information, and is used to indicate that the input current of the fill light can only be adjusted to the specified current at the maximum.
  • the correspondence between the movement magnification and the current stores a plurality of movement magnifications and a maximum input current corresponding to the plurality of movement magnifications respectively, and the larger the movement magnification, the larger the corresponding maximum input current.
  • the operation of determining the designated current may be: determining the movement magnification information indication from the correspondence between the movement magnification and the current The maximum input current corresponding to the movement magnification is determined, and the maximum input current corresponding to the movement magnification indicated by the movement magnification information is determined as the specified current.
  • the adjustment of the input current of the fill light is stopped: in the process of adjusting the input current of the fill light, the image of the captured image is determined in real time or periodically.
  • the brightness and the input current of the fill light when the difference between the image brightness of the image captured at a time and the first target brightness is not greater than the preset tolerance threshold, and the input current of the fill light is found to be equal to one time.
  • the adjustment of the input current to the fill lamp is stopped. That is to say, if it is necessary to simultaneously achieve the above two conditions, the adjustment of the input current of the fill lamp is stopped, and if only one of the conditions is reached, the adjustment of the input current to the fill lamp may not be stopped.
  • the adjustment of the input current of the fill light is stopped according to at least one of the movement magnification information and the first target brightness.
  • the image brightness of the image taken at each time and the input current of the fill light are monitored. It is judged whether the brightness of the currently monitored image satisfies the first stop condition, and determines whether the currently monitored input current satisfies the second stop condition.
  • the first stop condition is that the difference between the image brightness and the first target brightness is not greater than a preset tolerance threshold
  • the second stop condition is that the input current is equal to the specified current.
  • the input current of the fill lamp Whether the input current of the lamp reaches the specified current, whether it is first detected that the difference between the brightness of the image of the captured image and the brightness of the first target is not greater than the preset tolerance threshold, or whether the input current of the fill light is detected first When the current is specified, the input current of the fill lamp is stopped. If it is detected that the difference between the image brightness of the captured image and the first target brightness is not greater than the preset tolerance threshold, and the input current of the fill light reaches the specified current, the input current of the fill light is also stopped.
  • the preset tolerance threshold may stop increasing the input current of the fill light when the difference between the image brightness of the captured image and the first target brightness is not greater than the preset tolerance threshold.
  • the input current of the fill light when the input current of the fill light is found to be equal to the specified current at a certain time, even if the image brightness of the image captured at this time is different from the brightness of the first target The value is still greater than the preset tolerance threshold, and it is also necessary to stop increasing the input current of the fill light.
  • the adjustment of the input current of the fill light is stopped according to the movement magnification information.
  • the movement magnification can determine the specified current, and the specified current is the maximum input current that the fill light can reach. After acquiring the movement magnification information of the imaging device, the movement magnification of the imaging device can be determined, and according to the correspondence relationship between the pre-stored movement magnification and the current, the current corresponding to the movement magnification information can be determined. This current is the specified current.
  • the magnitude of the input current is monitored.
  • the adjustment of the input current of the fill light can be stopped.
  • the size of the environment space of the image pickup device can be used as an environmental reference parameter for the next adjustment.
  • the exposure method is generally implemented only by adjusting three factors of the aperture value, the shutter speed, and the gain value, and the exposure method provided by the embodiment of the present application is based on three factors of the aperture value, the shutter speed, and the gain value.
  • the factor of increasing the input current of the fill light is added, that is, the exposure can be adjusted by adjusting the aperture value, the shutter speed, the gain value, and the input current of the fill light, thereby providing a more dimensional
  • the exposure method, and the exposure method can improve the exposure effect when the fill light is suddenly turned on or off in the related art, optimize the user experience, and avoid frequent switching of the day and night shooting mode in a specific scene.
  • the exposure parameter during the exposure process may be acquired, and when the exposure parameter at any time satisfies the exposure condition and the ambient brightness at the time meets the brightness condition, the adjustment is stopped. Exposure parameters, and then adjust the input current of the fill light, so that the exposure process can be coordinated with the control of the fill light. Since the fill light is turned off when the input current of the fill light is 0, when the input current of the fill light is greater than 0, the fill light is turned on, so the fill light can be controlled to be turned on by adjusting the input current of the fill light. shut down. Moreover, the opening and closing of the fill light is related to the day and night shooting mode of the image capturing device.
  • the image capturing device When the fill light is off, the image capturing device is in the day mode, and when the fill light is turned on, the image capturing device is in the night mode, so by adjusting the fill light
  • the input current can indirectly switch the day/night shooting mode, thereby achieving the coordination of the exposure process with the day and night switching process, and avoiding the influence of the sudden switching of the day/night shooting mode on the exposure effect when the two are separately performed.
  • the input current of the fill light is related to the light-emitting brightness of the fill light, the larger the input current is, the larger the light-emitting brightness is. Therefore, by adjusting the input current of the fill light during the exposure process, the fill light can also be controlled. The brightness of the light, so that the frequent switching of the day and night shooting mode caused by the excessive brightness of the fill light in a specific scene can be avoided.
  • the embodiment of the present application further provides an exposure method, including the following steps:
  • the target brightness corresponding to the plurality of ambient brightnesses and the plurality of ambient brightnesses is stored.
  • the step is the same as the above-mentioned step 201. Referring to the related description of the foregoing step 201, details are not described herein again.
  • the exposure parameter is adjusted based on the first target brightness, when it is found that the exposure parameter at a moment satisfies the exposure condition, the adjustment of the exposure parameter is stopped, and the current ambient brightness is obtained;
  • step 202 is the same as step 202 above. Referring to the related description of step 202 above, details are not described herein again.
  • the current adjustment command is triggered, and according to the current adjustment instruction, the input current of the fill light is adjusted by the driving circuit of the fill light, so that the image brightness of the captured image tends to be Near the first target brightness.
  • step is the same as the above step 203. Referring to the related description of the foregoing step 203, details are not described herein again.
  • the step is the same as the fourth implementation manner described above. Referring to the related description of the fourth implementation manner, details are not described herein again.

Abstract

本申请公开了一种曝光方法、装置及摄像设备，方法包括：当基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整；当对补光灯的输入电流进行调整的过程，发现一时刻拍摄得到的图像的图像亮度与第一目标亮度的差值不大于该预设容差阈值时，停止对补光灯的输入电流的调整。本申请可以将曝光过程和补光灯的电流调整过程协调进行，提高了曝光效果，避免了特定场景下日夜拍摄模式的频繁切换问题。

Description

曝光方法、装置及摄像设备
本申请要求于2018年04月04日提交中国专利局、申请号为201810302100.8发明名称为“曝光方法、装置及摄像设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及摄像技术领域，特别涉及一种曝光方法、装置及摄像设备。
背景技术
随着摄像技术的发展，目前的数码相机、摄像机或移动终端等摄像设备都具有曝光功能。曝光是一种通过控制摄像设备的光圈值、快门速度、增益值等曝光参数，使拍摄图像的图像亮度达到目标亮度的控制策略。其中，目标亮度是由摄像设备根据环境亮度确定。另外，摄像设备通常还具有日夜切换功能，摄像机可在白天关闭补光灯进行拍摄。当光线低于某个级别时，摄像机可自动切换到夜间模式，即开启补光灯进行拍摄。
目前的摄像设备中，曝光功能和日夜切换功能各自独立进行，在曝光过程中，日夜拍摄模式的切换可能会影响曝光的效果，且在某些特定场景下还会出现日夜拍摄模式频繁切换的情况。比如，在曝光过程中，当摄像设备确定当前拍摄环境较暗，并将所处的白天模式切换为夜间模式时，补光灯的突然开启可能会导致拍摄画面过曝。再比如，在低照度的狭小室内空间中，摄像设备将会切换至夜间模式，而在通过以最大发光亮度开启补光灯切换至夜间模式之后，狭小的室内空间将会对补光灯发出的光线进行反射，使得摄像设备检测到较亮的环境亮度，进而通过关闭补光灯切换至白天模式，而在切换至白天模式之后，室内空间又会变暗，摄像设备又会切换至夜间模式，从而出现日夜拍摄模式的频繁切换。
发明内容
本申请提供了一种曝光方法、装置及摄像设备。所述技术方案如下：
第一方面，提供了一种曝光方法，应用于摄像设备中，所述方法包括：
基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于所述第一目标亮度调整曝光参数；
其中，所述第一环境亮度是指曝光之前的环境亮度，所述指定对应关系存储有多个环境亮度和所述多个环境亮度分别对应的目标亮度；
当基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对所述补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于所述第一目标亮度；
当对所述补光灯的输入电流进行调整的过程，发现一时刻拍摄得到的图像的图像亮度与所述第一目标亮度的差值不大于该预设容差阈值时，停止对所述补光灯的输入电流的调整，所述指定电流是根据所述摄像设备的机芯倍率信息确定得到。
第二方面，本申请实施例提供了一种曝光方法，其特征在于，所述方法包括：
基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于所述第一目标亮度调整曝光参数；
其中，所述第一环境亮度是指曝光之前的环境亮度，所述指定对应关系存储有多个环境亮度和所述多个环境亮度分别对应的目标亮度；
当基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对所述补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于所述第一目标亮度；
在对所述补光灯的输入电流进行调整的过程，当所述补光灯的输入电流等于指定电流时，停止对所述补光灯的输入电流的调整，所述指定电流是根据所述摄像设备的机芯倍率信息确定得到。
本申请实施例中，在摄像设备进行曝光的过程中，可以获取曝光过程中的曝光参数，当发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，再对补光灯的输入电流进行调整，如此可以将曝光过程与补光灯的控制协调进行。由于当补光灯的输入电流为0时，补光灯关闭，当补光灯的输入电流大于0时，补光灯开启，因此通过调整补光灯的输入电流能够控制补光灯的开启和关闭。而且，补光灯的开启和关闭与摄像设备的日夜拍摄模式有关，当补光灯关闭时，摄像设备处于白天模式，当补光灯开启时，摄像设备处于夜间模式，因此通过调整补光灯的输入电流 可以间接实现对日夜拍摄模式的切换，进而实现了将曝光过程与日夜切换过程协调进行，避免了两者单独进行时日夜拍摄模式的突然切换对曝光效果的影响。另外，由于补光灯的输入电流与补光灯的发光亮度有关，输入电流越大，发光亮度越大，因此通过在曝光过程中对补光灯的输入电流进行调整，还能够控制补光灯的发光亮度，从而可以避免特定场景下补光灯亮度过大所引起的日夜拍摄模式的频繁切换。
附图说明
为了更清楚地说明本申请实施例和现有技术的技术方案，下面对实施例和现有技术中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种曝光方法的流程图；
图2为本申请实施例提供的另一种曝光方法的流程图；
图3为本申请实施例提供的应用于图1和图2中调整补光灯电流过程中,图像曝光参数对应的多个阶段点的示意图。
具体实施方式
为使本申请的目的、技术方案、及优点更加清楚明白，以下参照附图并举实施例，对本申请进一步详细说明。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在对本申请实施例进行详细的解释说明之前，先对本申请实施例的应用场景予以介绍。
本申请实施例可以应用于摄像设备开启之后进行拍摄的场景中。在拍摄过程中，为了提高拍摄效果，摄像设备可以根据环境亮度进行曝光以及进行日夜拍摄模式的切换，以使摄像设备能够呈现出清晰的拍摄图像。其中，摄像设备是指具有摄像功能的设备，例如，本申请实施例中的摄像设备可以为数码照相机、数码摄像机、球形摄像机(简称球机)或移动终端等，该移动终端可以为手机或平板电脑等。
本申请实施例提供的曝光方法可适用于解决在狭小室内空间或球机运转拍摄等场景中，可以解决容易出现的日夜拍摄模式频繁切换的问题。其他应 用场景，本领域技术人员也可以参考使用。
例如，对于低照度的狭小室内空间，本申请实施例可以通过将曝光过程和补光灯的控制协调进行，使得曝光过程中，当曝光参数满足曝光条件且环境亮度满足亮度条件时，通过减小补光灯的输入电流，逐渐减小补光灯的发光亮度且减小到合适亮度即停止，这样可以解决摄像设备以最大发光亮度开启补光灯并切换至夜间模式之后，当检测到室内空间反射的较大亮度时又会切换回白天模式的问题，避免了狭小室内空间内日夜拍摄模式的频繁切换。
再例如，当该摄像设备为球机时，如果球机在运转过程中所监控的场景包括至少一个低亮度场景和至少一个高亮度场景，则该球机在监控过程中也就需要进行日夜拍摄模式的频繁切换。比如，以低亮度场景为窗台附近为例，则当该球机运转至窗台附近时，由于窗台附近的亮度很低，需要打开补光灯且需要切换至夜间模式进行拍摄，当球机运转至高亮度的室外场景时，球机需要切换至白天模式即关闭补光灯进行拍摄，因此该球机在从窗台附近到室外拍摄的过程中，也需要进行日夜拍摄模式的频繁切换。
本申请实施例中，对于球机运转拍摄场景，可以将曝光过程和补光灯的控制协调进行，使得曝光过程中，当曝光参数满足曝光条件且环境亮度满足亮度条件时，才对补光灯的输入电流进行调整，且通过对补光灯的输入电流进行调整可以使得补光灯的发光亮度逐渐增大或减小到合适亮度即停止，避免了球机运转过程中日夜拍摄模式的频繁切换。
图1是本申请实施例提供的一种曝光方法的流程图，该方法可以应用于摄像设备中，如图1所示，该曝光方法包括如下步骤：
步骤101：基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于该第一目标亮度调整曝光参数。
其中，该第一环境亮度是指曝光之前的环境亮度，该指定对应关系存储有多个环境亮度和该多个环境亮度分别对应的目标亮度。
步骤102：当基于该第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据该电流调整指令，通过补光灯的驱动电路对该补光灯的输入电流进行调整。
其中，一种实现方式中，发现一时刻的曝光参数满足曝光条件时，停止调整曝光参数，并获取当前的环境亮度；当所获取的当前的环境亮度满足亮 度条件时，触发电流调整指令。
步骤103：当对该补光灯的输入电流进行调整的过程，发现一时刻拍摄得到的图像的图像亮度与该第一目标亮度的差值不大于该预设容差阈值时，停止对该补光灯的输入电流的调整。
其中，该指定电流是根据该摄像设备的机芯倍率信息确定得到。
本申请实施例还提供一种曝光方法，包括如下步骤：
基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于第一目标亮度调整曝光参数；
其中，第一环境亮度是指曝光之前的环境亮度，指定对应关系存储有多个环境亮度和多个环境亮度分别对应的目标亮度；
当基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于第一目标亮度；
在对补光灯的输入电流进行调整的过程，当补光灯的输入电流等于指定电流时，停止对补光灯的输入电流的调整，指定电流是根据摄像设备的机芯倍率信息确定得到。
本申请实施例中，在摄像设备进行曝光的过程中，可以获取曝光过程中的曝光参数，当发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，再对补光灯的输入电流进行调整，如此可以将曝光过程与补光灯的控制协调进行。由于当补光灯的输入电流为0时，补光灯关闭，当补光灯的输入电流大于0时，补光灯开启，因此通过调整补光灯的输入电流能够控制补光灯的开启和关闭。而且，补光灯的开启和关闭与摄像设备的日夜拍摄模式有关，当补光灯关闭时，摄像设备处于白天模式，当补光灯开启时，摄像设备处于夜间模式，因此通过调整补光灯的输入电流可以间接实现对日夜拍摄模式的切换，进而实现了将曝光过程与日夜切换过程协调进行，避免了两者单独进行时日夜拍摄模式的突然切换对曝光效果的影响。另外，由于补光灯的输入电流与补光灯的发光亮度有关，输入电流越大，发光亮度越大，因此通过在曝光过程中对补光灯的输入电流进行调整，还能够控制补光灯的发光亮度，从而可以避免特定场景下补光灯亮度过大所引起的日夜拍摄模式的频繁切换。
可选地，该方法还包括：
在对该补光灯的输入电流进行调整的过程中，每隔第一预设时长获取第三环境亮度；
当每获取到一个第三环境亮度时，根据获取的第三环境亮度和该指定对应关系，确定拍摄图像需要达到的第二目标亮度；
将进行曝光的该第一目标亮度切换为该第二目标亮度，并基于该第二目标亮度调整曝光参数。
可选地，该曝光参数包括光圈值、快门速度和增益值；
该获取当前的环境亮度之前，还包括：
确定该摄像设备的日夜拍摄模式；
当该摄像设备的日夜拍摄模式为白天模式，且基于该第一目标亮度调整曝光参数的过程中，发现一时刻的光圈值、快门速度和增益值分别不小于第一预设光圈值、第一预设快门速度和第一预设增益值时，确定发现时刻的曝光参数满足该曝光条件；
该当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根据该电流调整指令，通过补光灯的驱动电路对该补光灯的输入电流进行调整，包括：
当所获取的当前的环境亮度小于第一亮度阈值时，确定所获取的当前的环境亮度满足该亮度条件，并触发第一调整指令，该第一调整指令用于指示增大该补光灯的输入电流；
根据该第一调整指令，通过该补光灯的驱动电路增大该补光灯的输入电流。
可选地，该曝光参数包括光圈值、快门速度和增益值；
该获取当前的环境亮度之前，还包括：
确定该摄像设备的日夜拍摄模式；
当该摄像设备的日夜拍摄模式为夜间模式，且基于该第一目标亮度调整曝光参数的过程中，发现一时刻的光圈值、快门速度和增益值分别不大于第二预设光圈值、第二预设快门速度和第二预设增益值时，确定发现的时刻的曝光参数满足曝光条件，该第二预设光圈值、第二预设快门速度和第二预设增益值分别小于该第一预设光圈值、第一预设快门速度和第一预设增益值；
当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根 据该电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整，包括：
当所获取的当前的环境亮度大于第二亮度阈值时，确定所获取的当前的环境亮度满足该亮度条件，并触发第二调整指令，该第二调整指令用于指示减小该补光灯的输入电流；
根据该第二调整指令，通过该补光灯的驱动电路减小该补光灯的输入电流。
可选地，该触发电流调整指令之前，还包括：
获取该摄像设备的机芯倍率信息；
当基于该机芯倍率信息确定该摄像设备未处于变倍过程时，执行该触发电流调整指令的步骤。
可选地，该触发电流调整指令之前，还包括：
确定该电流调整指令的已触发次数；
当该已触发次数小于预设次数阈值时，执行该触发电流调整指令的步骤；
该触发电流调整指令之后，还包括：
将该已触发次数加N，该N为正整数。
可选地，该将该已触发次数加N，包括：
确定当前触发该电流调整指令的第一时间点，以及在该第一时间点之前最近一次触发电流调整指令的第二时间点；
当该第一时间点和该第二时间点之间的相距时长不大于第二预设时长时，将该已触发次数加N。
可选地，该确定当前触发该电流调整指令的第一时间点，以及在该第一时间点之前最近一次触发该电流调整指令的第二时间点之后，还包括：
当该第一时间点和该第二时间点之间的相距时长大于该第一预设时长时，将该已触发次数清零。
可选地，该确定该电流调整指令的已触发次数之后，还包括：
当该已触发次数不小于该预设次数阈值时，维持该补光灯的当前输入电流不变；
根据最近一次触发电流调整指令的时间点，确定该补光灯的当前输入电流的维持时长；
当该维持时长不小于第三预设时长时，将该已触发次数清零。
上述所有可选技术方案，均可按照任意结合形成本公开的可选实施例，本申请实施例对此不再一一赘述。
图2是本申请实施例提供的另一种曝光方法的流程图，该方法可以应用于摄像设备中，如图2所示，该曝光方法包括如下步骤。
步骤201：基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于第一目标亮度调整曝光参数。
其中，第一环境亮度是指曝光之前的环境亮度，该指定对应关系存储有多个环境亮度和该多个环境亮度分别对应的目标亮度。
在摄像设备启动之后进行拍摄的过程中，周围的环境亮度通常是不断变化的，而且环境亮度的变化将会影响拍摄图像的图像亮度，进而影响拍摄图像的清晰度，因此，为了保证摄像设备在不同的环境亮度下，均能够呈现出较为清晰的拍摄图像，摄像设备可以在拍摄过程中不断进行曝光，曝光是指通过调整曝光参数，调整拍摄图像的图像亮度。
具体地，摄像设备可以在拍摄过程中实时地或周期性地获取环境亮度，并将获取的环境亮度作为第一环境亮度，每当获取到一个第一环境亮度时，基于获取的第一环境亮度确定拍摄图像需要达到的第一目标亮度，并基于该第一目标亮度进行曝光。其中，每次的曝光过程均可以按照步骤201-步骤207的方式进行处理，本申请实施例仅是以基于一次获取的第一环境亮度确定第一目标亮度，并基于该第一目标亮度进行曝光的曝光过程为例进行说明。
其中，第一环境亮度是指拍摄过程中该摄像设备所处的拍摄场景的亮度，第一目标亮度是指在第一环境亮度下，该摄像设备所拍摄的图像需要达到的图像亮度，只有当拍摄图像的图像亮度趋近或达到该第一目标亮度时，拍摄图像才能呈现出足够的清晰效果。其中，拍摄图像的图像亮度可以为拍摄图像的亮度平均值。基于第一目标亮度进行曝光是指基于第一目标亮度对曝光参数进行调整，以通过调整曝光参数控制曝光量，进而使拍摄图像的亮度逐渐趋近第一目标亮度。
实际应用中，摄像设备基于第一环境亮度确定拍摄图像需要达到的第一目标亮度之后，可以先将第一环境亮度与第一目标亮度进行比较，当第一环境亮度与第一目标亮度的差值大于预设容差阈值时，再基于第一目标亮度调整曝光参数。另外，当第一环境亮度与第一目标亮度的差值不大于该预设容差阈值时，还可以不进行曝光。
其中，该预设容差阈值用于指示图像亮度能够容忍的误差范围，且该预设容差阈值可以预先设置，具体可以由摄像设备默认设置，也可以由用户自定义设置，本申请实施例对此不做限定。例如，该预设容差阈值可以为0cd/m、2cd/m或5cd/m。当第一环境亮度与第一目标亮度的差值大于预设容差阈值时，说明第一环境亮度与第一目标亮度相差较大，此时需要通过曝光调整图像亮度，以保证图像清晰。当第一环境亮度与第一目标亮度的差值不大于预设容差阈值时，说明第一环境亮度与第一目标亮度相差较小，即第一环境亮度已趋近于或者达到第一目标亮度，这种情况下可以不进行曝光，即不对曝光参数进行调整。
实际应用中，摄像设备可以通过拍摄图像确定第一环境亮度。例如，摄像设备可以计算拍摄图像中各个像素点的亮度平均值，然后将该亮度平均值作为第一环境亮度。该摄像设备也可以通过其他方式确定第一环境亮度，比如通过安装的光线传感器获取第一环境亮度等，在此不作限定。
具体地，基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度的操作可以包括：从存储的指定对应关系中，确定第一环境亮度对应的目标亮度，将第一环境亮度对应的目标亮度，确定为第一目标亮度。
其中，该指定对应关系中存储有预先设置的多个不同的环境亮度和这多个不同的环境亮度分别对应的目标亮度。例如，对于白天获取的某个亮度为110cd/m(坎德拉/平方米)的环境亮度，其对应的目标亮度可以设置为100cd/m(坎德拉/平方米)，对于夜间获取的某个亮度为90cd/m的环境亮度，其对应的目标亮度可以设置为95cd/m等。
也即是，摄像设备的存储器中预先存储有环境亮度和目标亮度的对应关系，后续可以根据该对应关系，快速查找不同环境亮度分别对应的目标亮度，进而确定不同环境下获取的第一环境亮度对应的第一目标亮度。其中，对应关系中的环境亮度和目标亮度可以是自定义设定的，且每一环境亮度所对应的目标亮度也可以是自定义设定的。一种实现方式中，实际应用中，预先设置的不同环境亮度分别对应的目标亮度可以为在实际使用环境中，根据经验确定的能够保证图像清晰的优选亮度。
拍摄过程中，摄像设备一般通过调整曝光参数进行曝光，且通常采用逐渐增大曝光参数或逐渐减小曝光参数的方式对曝光参数进行调整。也即是， 在摄像设备基于第一目标亮度调整曝光的过程中，摄像设备将会逐渐增大或逐渐减小曝光参数。
具体地，在摄像设备基于第一目标亮度调整曝光参数时，如果第一环境亮度小于第一目标亮度，且与第一目标亮度之间的差值大于第一预设容差阈值，为了提高图像亮度，摄像设备将会增大曝光参数；如果第一环境亮度大于第一目标亮度，且与第一目标亮度之间的差值大于第二预设容差阈值时，为了减小图像亮度，摄像设备将会减小曝光参数。其中，第一预设容差阈值与第二预设容差阈值可以相同，也可以不相同，在此不作限定。
其中，曝光参数通常包括光圈值、快门速度和增益值这3种参数。光圈值用于指示光圈的大小，能够指示摄像设备的镜头的通光量，光圈位于镜头内，是一个用于控制光线透过镜头进入机身内的感光元器件的表面的装置，光圈越大，镜头的通光量越大。快门速度用于指示快门的启动时间，能够决定曝光时间的长短。增益值是指感光元器件的增益值，用于指示感光元器件的电流放大倍数，通过增大增益值，能够提高拍摄图像的亮度。
在基于该第一目标亮度调整曝光参数的过程中，可以分别调整光圈值、快门速度和增益值这3种参数。具体地，增大曝光参数包括分别增大光圈值、快门速度和增益值，减小曝光参数包括分别减小光圈值、快门速度和增益值。
摄像设备还可以基于第一目标亮度逐渐调整曝光参数，例如逐渐增大曝光参数或逐渐减小曝光参数。逐渐增大曝光参数包括分别逐渐增大光圈值、快门速度和增益值，逐渐减小曝光参数包括分别逐渐减小光圈值、快门速度和增益值。具体地，逐渐增大曝光参数的操作可以为：按照时间顺序线性增大曝光参数，或者每隔特定时长增加一次曝光参数，每次增加预设值等。逐渐减小曝光参数的操作可以为：按照时间顺序线性减小曝光参数，或者每隔特定时长减小一次曝光参数，每次减小预设值等。其中，每次增加的预设值和每次减小的预设值可以是自定义设定的，每次增加的预设值和每次减小的预设值可以相同，也可以不相同。
步骤202：当基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件时，停止调整曝光参数，并获取当前的环境亮度。
本申请实施例中，摄像设备可以在基于第一目标亮度调整曝光参数的过程中，实时地或周期性地获取曝光参数，每当获取到一个曝光参数时，可以先判断获取的曝光参数是否满足预设条件。当获取的曝光参数不满足该预设 条件时，继续获取下一时刻的曝光参数；当某一时刻获取的曝光参数满足该预设条件时，则获取这一时刻的环境亮度。其中，预设条件即为预设的曝光条件。
具体地，该曝光条件可以根据日夜拍摄模式进行设置，也即是，不同的日夜拍摄模式可以对应设置不同的曝光条件，相应地，判断任一时刻的曝光参数是否满足预设条件可以包括以下两种方式。
第一种方式：确定摄像设备的日夜拍摄模式，当摄像设备的日夜拍摄模式为白天模式，且基于第一目标亮度进行曝光的过程中，发现一时刻的光圈值、快门速度和增益值分别不小于第一预设光圈值、第一预设快门速度和第一预设增益值时，则确定发现的时刻的曝光参数满足曝光条件。
其中，第一预设光圈值、第一预设快门速度和第一预设增益值分别为预先设置的光圈值、快门速度和增益值。白天模式是指补光灯处于关闭状态的拍摄模式。另外，当摄像设备处于白天模式时，该摄像设备还可能会自动启用红外滤光片，以通过红外滤光片过滤红外线。
也即是，若摄像设备处于白天模式，则可以在基于第一目标亮度进行曝光的过程中，当任一时刻摄像设备将曝光参数中的光圈值调整到不小于第一预设光圈值、快门速度调整到不小于第一预设快门速度，且增益值调整到不小于第一预设增益值时，确定该时刻的曝光参数满足曝光条件。
例如，当摄像设备在白天模式下进行拍摄的过程中，由于补光灯处于关闭状态，可能不能给拍摄环境提供足够亮度，当某一时刻获取的第一环境亮度小于第一目标亮度，且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备将会基于第一目标亮度，通过逐渐增大曝光参数进行曝光，以提高摄像设备的进光量，使拍摄图像的亮度逐渐趋近第一目标亮度。在摄像设备逐渐增大曝光参数过程中，当某一时刻的光圈值、快门速度和增益值分别不小于第一预设光圈值、第一预设快门速度和第一预设增益值时，即可确定这一时刻的曝光参数满足曝光条件。
另外，在摄像设备处于白天模式下，且当前的拍摄环境提供过度的亮度的情况下，当某一时刻获取的第一环境亮度大于第一目标亮度，且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备将会基于第一目标亮度，通过逐渐减小曝光参数进行曝光，以减少摄像设备的进光量，使得拍摄图像的亮度逐渐趋近于第一目标亮度。
本申请实施例中，还可以在基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数对应的阶段点不小于第一指定阶段点时，确定发现的时刻的曝光参数满足曝光条件。其中，该第一指定阶段点是从预先设置的多个阶段点中选取的，且对应的光圈值、快门速度和增益值分别为第一预设光圈值、第一预设快门速度和第一预设增益值的阶段点。
其中，该多个阶段点与多个不同的曝光参数一一对应，且该多个阶段点是指曝光参数的多个调整节点，摄像设备曝光过程中，曝光参数将会按照对应的曝光参数的大小顺序，在这多个阶段点之间依次进行调整。实际应用中，该多个阶段点可以是预先根据该摄像设备的光圈组件和感光元器件的类型自定义设定的，为了达到最优的图像效果，每一个阶段点在实际使用环境中确定了较优的曝光参数。
例如，实际应用中，可以预先从摄像设备可调整的曝光参数范围内选取多个曝光参数，将选取的多个曝光参数作为多个阶段点，并按照对应的曝光参数从小到大的顺序，对这多个阶段点进行排序，然后通过依次增大阶段点或减小阶段点的方式进行曝光。其中，通过依次增大阶段点，即可逐渐增大曝光参数，通过依次减小阶段点，即可逐渐减小曝光参数。
例如，参见图3，假设该摄像设备的曝光参数范围包括13个阶段点，且从阶段点1到阶段点13，其对应的光圈值、快门速度和增益值逐渐增大。如图3所示，阶段点1对应的光圈值为最小光圈值PwmMin、对应的快门速度为最小快门速度ShuMin、对应的增益值为0，阶段点13对应的光圈值为最大光圈值PwmMax、对应的快门速度为最大快门速度ShuMax、对应的增益值为最大增益值AgcMax。假设该第一指定阶段点为阶段点12，则该摄像设备可以在将曝光参数对应的阶段点调整到不小于阶段点12时，确定曝光参数满足预设条件，即满足曝光条件。
例如，假设摄像设备的曝光参数范围包括多个阶段点，当摄像设备在白天模式下进行拍摄时，由于补光灯处于关闭状态，可能不能给拍摄环境提供足够亮度，当某一时刻获取的第一环境亮度小于第一目标亮度，且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备可以基于第一目标亮度，通过增大曝光参数对应的阶段点进行曝光。示例的，假设该摄像设备的曝光参数范围包括上述13个阶段点，且第一指定阶段点为阶段点12，则在摄像设备从阶段点1依次增大的过程中，当某一时刻的阶段点增大到阶段点12时， 即可确定该时刻的曝光参数满足预设条件，即满足曝光条件。
第二种方式：确定摄像设备的日夜拍摄模式，当摄像设备的日夜拍摄模式为夜间模式，且基于第一目标亮度调整曝光的过程中，发现一时刻的光圈值、快门速度和增益值分别不大于第二预设光圈值、第二预设快门速度和第二预设增益值时，确定发现的时刻的曝光参数满足曝光条件。
其中，第二预设光圈值、第二预设快门速度和第二预设增益值分别为预先设置的光圈值、快门速度和增益值，且第二预设光圈值、第二预设快门速度和第二预设增益值分别小于上述第一预设光圈值、第一预设快门速度和第一预设增益值。夜间模式是指补光灯处于开启状态的拍摄模式。另外，当摄像设备处于夜间模式时，该摄像设备还可能会取消已启用的红外滤光片，以使红外线进入摄像设备的感光元器件。
也即是，若摄像设备处于夜间模式，则可以在基于第一目标亮度进行曝光的过程中，当任一时刻摄像设备将曝光参数中的光圈值调整到不大于第二预设光圈值、快门速度调整到不大于第二预设快门速度且增益值调整到不大于第二预设增益值时，则确定该任一时刻的曝光参数满足曝光条件。
例如，当摄像设备在夜间模式下进行拍摄时，补光灯处于开启状态，能够给拍摄环境补充亮度，但是补光灯的发光亮度可能会过大，当某一时刻获取的第一环境亮度大于第一目标亮度，且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备将会基于第一目标亮度，通过减小曝光参数进行曝光。通过减小曝光参数，可以减小摄像设备的进光量，进而减小拍摄图像的亮度，使得拍摄图像的亮度逐渐趋近第一目标亮度。在摄像设备逐渐减小曝光参数过程中，当某一时刻的光圈值、快门速度和增益值分别不大于第二预设光圈值、第二预设快门速度和第二预设增益值时，即可确定这一时刻的曝光参数满足曝光条件。
另外，在摄像设备处于夜间模式下，且补光灯提供的亮度不足的情况下，当某一时刻获取的第一环境亮度小于第一目标亮度，且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备将会基于第一目标亮度，通过逐渐增大曝光参数进行曝光，以增加摄像设备的进光量，使得拍摄图像的亮度逐渐趋近于第一目标亮度。
本申请实施例中，还可以在基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数对应的阶段点不大于第二指定阶段点时，确定发现的 时刻的曝光参数满足曝光条件。其中，该第二指定阶段点是从预先设置的多个阶段点中选取的，且对应的光圈值、快门速度和增益值分别为第二预设光圈值、第二预设快门速度和第二预设增益值的阶段点。例如，参见图3，假设该第二指定阶段点为阶段点11，则该摄像设备可以在将曝光参数对应的阶段点调整到不大于阶段点11时，确定曝光参数满足预设条件，该预设条件即为曝光条件。
例如，假设摄像设备的曝光参数范围包括多个阶段点，当摄像设备在夜间模式下进行拍摄时，补光灯的发光亮度可能会过大，当某一时刻获取的第一环境亮度大于第一目标亮度且与第一目标亮度之间的差值大于预设容差阈值时，摄像设备需要基于第一目标亮度，通过减小曝光参数对应的阶段点来进行曝光。示例的，假设该摄像设备的曝光参数范围包括上述13个阶段点，且第二指定阶段点为阶段点11，则摄像设备可以在从阶段点13依次减小的过程中，当某一时刻的阶段点减小到阶段点11时，确定该时刻的曝光参数满足预设条件，即满足曝光条件。
步骤203：当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根据该电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于第一目标亮度。
补光灯的输入电流可以用于控制补光灯的发光亮度。具体地，补光灯的输入电流与补光灯的发光亮度成正比，补光灯的输入电流越大，发光亮度越大，输入电流越小，发光亮度也越小。此外，补光灯的输入电流还可以用于控制补光灯的开启和关闭，当补光灯的输入电流为0时，补光灯关闭，当补光灯的输入电流大于0时，补光灯开启。由于补光灯的开启和关闭与摄像设备的日夜拍摄模式有关，当补光灯关闭时，摄像设备处于白天模式，当补光灯开启时，摄像设备处于夜间模式，因此通过调整补光灯的输入电流可以间接对日夜拍摄模式的切换。
本申请实施例中，在获取到当前的环境亮度后，可以先判断所获取的当前的环境亮度是否满足亮度条件，当满足亮度条件时，触发电流调整指令，以根据该电流调整指令，通过调整补光灯的输入电流改变补光灯的发光亮度，从而能够在曝光的基础上进一步结合补光灯的发光亮度的控制，使得拍摄图像的图像亮度能够快速达到第一目标亮度。
在曝光过程中，当曝光参数满足曝光条件且环境亮度满足亮度条件时， 对补光灯的输入电流进行调整，能够控制补光灯的发光亮度，避免特定场景下补光灯亮度过大所引起的日夜拍摄模式的频繁切换。而且，由于通过调整补光灯的输入电流可以间接对日夜拍摄模式进而切换，因此通过在曝光过程中调整补光灯的输入电流，还可以实现曝光过程与日夜切换过程的协调进行，避免了两者单独进行时日夜拍摄模式的突然切换对曝光效果的影响。
其中，对补光灯的输入电流进行调整包括：增大补光灯的输入电流，或者减小补光灯的输入电流。具体地，可以通过补光灯的驱动电路，逐渐调整补光灯的发光亮度，比如逐渐增大补光灯的输入电流，或者逐渐减小补光灯的输入电流。通过逐渐增大补光灯的输入电流，可以控制补光灯的发光亮度逐渐变大，即补光灯越来越亮；通过减小补光灯的输入电流，可以控制补光灯的发光亮度逐渐变小，即补光灯越来越暗。
具体地，逐渐增大补光灯的输入电流可以包括：按照时间顺序线性增大补光灯的输入电流，或者，每隔特定时长增大一次补光灯的输入电流，每次增大预设大小的电流等。逐渐减小补光灯的输入电流可以包括：按照时间顺序线性减小补光灯的输入电流，或者，每隔特定时长减小一次补光灯的输入电流，每次减小预设大小的电流等。
本申请实施例中，根据所处日夜拍摄模式的不同，亮度条件相应地可以不同。具体地，当摄像设备处于白天模式，该亮度条件可以为所获取的当前的环境亮度小于第一亮度阈值的条件，当摄像设备处于夜间模式，该亮度条件可以为所获取的当前的环境亮度大于第二亮度阈值的条件。其中，该第一亮度阈值和第二亮度阈值可以预先设置，且两者可以相同，也可以不同，本申请实施例对此不做限定。例如，在一个实现方式中，该第一亮度阈值和第二亮度阈值均可以为第一目标亮度。
具体地，步骤203可以包括以下两种实现方式。
第一种实现方式：当通过上述第一种方式确定曝光参数满足曝光条件，并获取到当前的环境亮度时，将所获取的当前的环境亮度与第一亮度阈值进行比较，当所获取的当前的环境亮度小于第一亮度阈值时，确定所获取的当前的环境亮度满足亮度条件，并触发第一调整指令，根据该第一调整指令，通过补光灯的驱动电路增大补光灯的输入电流。
其中，该第一调整指令用于指示增大补光灯的输入电流。具体地，摄像设备可以根据该第一调整指令，通过补光灯的驱动电路逐渐增大补光灯的输 入电流。比如，按照时间顺序线性增大补光灯的输入电流，或者，每隔特定时长增大一次补光灯的输入电流，每次增大预设大小的电流等。
由于摄像设备在白天模式下，补光灯处于关闭状态，补光灯的输入电流为0，因此在增大补光灯的输入电流时，补光灯的输入电流将从0开始增大，随着输入电流的增大，只要补光灯的输入电流大于0，就可以开启补光灯，进而将摄像设备从白天模式切换至夜间模式，而且，随着输入电流的继续增大，补光灯的发光亮度也会随之逐渐增大。
由此可知，对于处于白天模式的摄像设备来说，该摄像设备的补光灯是关闭的，在该摄像设备基于第一目标亮度进行曝光的过程中，当曝光参数和所获取的当前的环境亮度均满足各自所需满足的条件时，就可以触发第一调整指令，并根据该第一电流调整指令增大补光灯的输入电流，而且通过增大补光灯的输入电流，可以开启补光灯，将摄像设备从白天模式切换至夜间模式，并可以将补光灯的发光亮度逐渐增大。
通过根据该第一调整指令，开启补光灯，并逐渐增大补光灯的发光亮度，一方面可以将摄像设备从白天模式切换至夜间模式，通过补光灯对拍摄环境进行补光，提升拍摄图像的图像亮度，另一方面可以避免相关技术中以最大亮度开启补光灯时，因补光灯亮度过大引起的过曝或日夜拍摄模式的频繁切换。
其中，该补光灯可以为红外灯、白光灯、混光灯或激光灯等，本申请实施例对此不做限定。另外，当摄像设备处于白天模式时还启用了彩色滤光片时，还可以触发取消启用彩色滤光片的指令。
第二种实现方式：当通过上述第二种方式确定曝光参数满足曝光条件，并获取到当前的环境亮度时，将所获取的当前的环境亮度与第二亮度阈值进行比较，当所获取的当前的环境亮度大于第二亮度阈值时，确定所获取的当前的环境亮度满足亮度条件，并触发第二调整指令，根据该第二调整指令，通过补光灯的驱动电路减小补光灯的输入电流。
其中，该第二调整指令用于指示减小补光灯的输入电流。具体地，摄像设备可以根据该第二调整指令，通过补光灯的驱动电路逐渐减小补光灯的输入电流。比如，按照时间顺序线性减小补光灯的输入电流，或者，每隔特定时长减小一次补光灯的输入电流，每次减小预设大小的电流等。
由于摄像设备在夜间模式下，补光灯处于开启状态，补光灯的输入电流 大于0，因此在减小补光灯的输入电流时，随着输入电流的减小，补光灯的发光亮度也会随之减小，当补光灯的输入电流减小到0时，补光灯将会关闭，从而将摄像设备从夜间模式切换至白天模式。
由此可知，对于处于夜间模式的摄像设备来说，该摄像设备的补光灯是开启的，在该摄像设备基于第一目标亮度进行曝光的过程中，当曝光参数和所获取的当前的环境亮度均满足各自所需满足的条件时，就可以触发第二调整指令，并根据该第二调整指令减小补光灯的输入电流，进而逐渐减小补光灯的发光亮度，而且当补光灯的输入电流减小到0时，还可以将摄像设备从夜间模式切换至白天模式。
通过根据该第二电流调整指令，逐渐减小补光灯的发光亮度，一方面可以减小拍摄图像的图像亮度，甚至还可以将摄像设备从夜间模式切换至白天模式，另一方面还可以避免直接关闭补光灯亮度引起的亮度不足或日夜拍摄模式的频繁切换。
此外，在第二种实现方式中，当摄像设备处于夜间模式时未启用红外滤光片时，还可以触发用于指示启用红外滤光片的指令，进而启用红外滤光片对红外线进行过滤。
一种实施方式中，当所获取的当前的环境亮度满足亮度条件时，还可以先确定该电流调整指令的已触发次数，当该已触发次数小于预设次数阈值时，再执行触发电流调整指令的步骤。其中，该已触发次数是对已触发的电流调整指令进行累计得到的，一般来说，累计的起点是从在该摄像设备开启之后开始累计的，当摄像设备开启后出现已触发次数清零的情况时，则在清零后重新开始累计。该电流调整指令包括上述第一调整指令和第二调整指令。
其中，该预设次数阈值可以预先设置，且可以由该摄像设备默认设置，也可以由用户自定义设置，本申请实施例对此不作限定。实际应用中，预设次数阈值用于表示频繁触发该电流调整指令的上限阈值，当该已触发次数小于预设次数阈值，表示该电流调整指令还未被频繁触发，当该已触发次数不小于该预设次数阈值时，表示该电流调整指令已被频繁触发。例如，该预设次数阈值可以为2次、3次、5次或10次等。
本申请实施例中，每次触发了该电流调整指令时，还可以对该电流调整指令触发次数进行累加，以统计该调整指令的已触发次数。当所获取的当前的环境亮度满足亮度条件时，可以先确定该电流调整指令的已触发次数，当 已触发次数小于预设次数阈值时，再触发该电流调整指令。
通过在已触发次数小于预设次数阈值时，执行触发该电流调整指令的步骤，可以避免对该电流调整指令的频繁触发，进而避免因补光灯的频繁调整导致的日夜拍摄模式不正常的频繁切换。
另外，触发该电流调整指令之后，还可以将该已触发次数加N，以实现已触发次数的累加。其中，该N为正整数，实际应用中，该N通常取值为1，当然也可以取其它值，本申请实施例对此不做限定。
一种实施方式中，将已触发次数加N之前，还可以先确定当前触发该电流调整指令的第一时间点，以及在该第一时间点之前最近一次触发电流调整指令的第二时间点，当该第一时间点和该第二时间点之间的相距时长不大于第二预设时长时，再将该已触发次数加N。
其中，该第二预设时长为预先设置的用于指示该电流调整指令被频繁触发的时长，该第二预设时长可以是自定义设定的。实际应用中，该第二预设时长通常可以设置为一个较短的时长，例如，该第二预设时长可以为5min、10min或30min等。
也即是，在触发该电流调整指令之后，可以先确定当前触发该电流调整指令的时间与上次触发电流调整指令的时间之间的触发时间间隔，当触发时间间隔不大于第二预设时长时，说明摄像设备在第二预设时长的时间段内触发了两次电流调整指令，此时可以通过将已触发次数加N对已触发次数累加，进而对第二预设时长的时间段内的调整次数进行统计。
一种实施方式中，当该第一时间点和该第二时间点之间的相距时长大于该第二预设时长时，还可以将该已触发次数清零。当第一时间点和第二时间点之间的相距时长大于第二预设时长时，可以认为连续两次的触发属于正常情况，即不属于频繁调整情形，此时可以通过将已触发次数清零，避免对正常调整情形下调整次数的统计。
例如，当第一时间点和第二时间点之间的相距时长为12小时，说明拍摄环境经历了白天到夜间的转换，或者经历了从夜间到白天的转换，在这两种转换条件下，一般都需要通过调整补光灯的输入电流来对摄像设备的日夜拍摄模式进行切换，因此这两种情况下的调整属于正常情形下的调整，可以不对调整次数进行统计。
一种实施方式中，当该摄像设备能够进行变倍时，触发该电流调整指令 之前，还可以先获取摄像设备的机芯倍率信息，该机芯倍率信息可以用于指示该摄像设备的变倍信息，即可以指示该摄像设备当前是否处于变倍过程；当基于该机芯倍率信息确定该摄像设备未处于变倍过程时，再执行触发该电流调整指令的步骤。另外，当基于该机芯倍率信息确定该摄像设备处于变倍过程时，可以不触发该电流调整指令。
由于摄像设备在变倍过程中，将会改变拍摄范围，进而可能会从低亮度场景切换至高亮度场景，或者从高亮度场景切换至低亮度场景，导致变倍过程中日夜拍摄模式的频繁切换，因此，本申请实施例中，可以通过在变倍过程中控制摄像设备不触发该电流调整指令，避免变倍过程中调整补光灯的输入电流，进而避免对日夜拍摄模式的频繁切换。例如，当该摄像设备为球机时，可以避免球机通过变倍进行运转过程中的日夜拍摄模式的频繁切换。
在另一实施例中，当已触发次数不小于该预设次数阈值时，还可以维持补光灯的当前输入电流不变，即不执行触发该电流调整指令的步骤，而且还可以根据最近一次触发电流调整指令的时间点，确定补光灯的当前输入电流的维持时长，当该维持时长不小于第三预设时长时，将该已触发次数清零。
当已触发次数不小于该预设次数阈值时，说明已对补光灯的输入电流进行了频繁调整，进而可能对日夜拍摄模式进行了多次切换，因此为了避免对日夜拍摄模式的频繁切换，可以不触发对补光灯的输入电流进行调整的电流调整指令，以维持补光灯的当前输入电流不变。
其中，可以将当前时间与最近一次触发电流调整指令的时间点之间的相距时长作为该维持时长。具体地，可以在最近一次触发调整指令时，通过计数器开始计时，根据计时器的计时时长确定补光灯的输入电流的维持时长。
其中，该第三预设时长可以预先设置得到，该第三预设时长可以是自定义设定的，例如，该第三预设时长可以为2min、5min、10min或30min等，本申请实施例对该第三预设时长的具体时长不作限定。
通过在已触发次数较多时，将补光灯的输入电流维持长时间不变，不触发对补光灯的输入电流的调整指令，可以防止对补光灯的输入电流的频繁切换，且可以间接防止对日夜拍摄模式的频繁切换，从而可以防止震荡，通过在维持时长超过第三预设时长时，将已触发次数清零，可以将摄像设备恢复正常模式，即重新按照本申请实施例提供的调整策略对补光灯的输入电流进行调整。
本申请实施例仅是以当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令为例进行说明，而实际应用中，当所获取的当前的环境亮度不满足亮度条件时，还可以不触发电流调整指令，并基于第一目标亮度继续进行曝光，也即是，基于第一目标亮度继续对曝光参数进行调整。
步骤204：在对补光灯的输入电流进行调整的过程中，每隔第一预设时长获取第三环境亮度。
其中，该第一预设时长可以预先设置，且可以由摄像设备默认设置，也可以由用户自定义设置，本申请实施例对此不做限定。实际应用中，由于对补光灯的输入电流进行调整的时长通常非常短，因此该第一预设时长也可以设置为一个极短的时长，比如，该第一预设时长可以为0.1s、0.5s或1s等。
步骤205：当每获取到一个第三环境亮度时，根据获取的第三环境亮度和该指定对应关系，确定拍摄图像需要达到的第二目标亮度。
其中，步骤205中根据获取的第三环境亮度和该指定对应关系，确定拍摄图像需要达到的第二目标亮度方式，与上述步骤201中根据第一环境亮度和该指定对应关系，确定拍摄图像需要达到的第一目标亮度方式同理，具体实现过程可以参考上述步骤201的相关描述，本申请实施例在此不再赘述。
步骤206：将进行曝光的第一目标亮度切换为第二目标亮度，并基于第二目标亮度调整曝光参数。
为了实现更加准确地曝光，本申请实施例还可以在对补光灯的输入电流进行调整的过程中，每隔第一预设时长获取第三环境亮度，并根据获取的第三环境亮度和该指定对应关系，确定拍摄图像需要达到的第二目标亮度，将之前进行曝光的第一目标亮度切换为第二目标亮度，并基于第二目标亮度继续进行曝光，以通过调整曝光参数控制曝光量，进而使拍摄图像的亮度逐渐趋近该第二目标亮度。
具体地，基于该第二目标亮度调整曝光参数包括：当第三环境亮度小于该第三环境亮度、且与该第三环境亮度之间的差值大于该预设容差阈值时，增大曝光参数，当第三环境亮度大于该第三环境亮度、且与该第三环境亮度之间的差值大于该预设容差阈值时，减小曝光参数。
其中，步骤204-206为可选步骤，步骤204-206的目的是在对补光灯的输入电流进行调整的同时，基于电流调整过程中的实际环境亮度继续进行曝光，以防止在对补光灯的输入电流进行调整中出现拍摄图像过曝或过暗的情况， 从而进一步提高曝光效果。
步骤207：当对补光灯的输入电流进行调整的过程中，当达到一定条件时，则可以停止对补光灯的输入电流的调整，该指定电流是根据摄像设备的机芯倍率信息确定得到。
本申请实施例中，针对停止对补光灯的输入电流的调整所需达到的一定条件，可以根据以下四种实现方式实现。
第一种实现方式：根据第一目标亮度，停止对补光灯的输入电流的调整。
对补光灯的输入电流进行调整的目的，就是为了结合补光灯的控制快速将拍摄图像的图像亮度趋近该第一目标亮度，因此可以根据第一目标亮度，停止对补光灯的输入电流的调整。
具体地，根据第一目标亮度，停止对补光灯的输入电流的调整包括：在对补光灯的输入电流进行调整的过程中，实时地或周期地确定拍摄得到的图像的图像亮度，当发现某一时刻拍摄得到的图像的图像亮度与该第一目标亮度的差值不大于该预设容差阈值时，停止对补光灯的输入电流的调整。
第二种实现方式：根据机芯倍率信息和第一目标亮度，停止对补光灯的输入电流的调整。
具体地，在对补光灯的输入电流进行调整之前，可以获取摄像设备的进行机芯倍率信息，从该机芯倍率信息中可以获取到该摄像设备的机芯倍率，根据该机芯倍率信息、预先存储的机芯倍率和电流的对应关系，可以确定出该机芯倍率信息中的机芯倍率所对应的电流，该电流即为指定电流，然后根据该指定电流和第一目标亮度，停止对补光灯的输入电流的调整。该指定电流是指根据机芯倍率信息确定的补光灯能够达到的最大输入电流，用于表示补光灯的输入电流最大只能调整到该指定电流。
其中，该机芯倍率和电流的对应关系中存储有多个机芯倍率和该多个机芯倍率分别对应的最大输入电流，而且机芯倍率越大，对应的最大输入电流就越大。具体地，根据该机芯倍率信息和预先存储的机芯倍率和电流的对应关系，确定该指定电流的操作可以为：从该机芯倍率和电流的对应关系中，确定该机芯倍率信息指示的机芯倍率对应的最大输入电流，并将该机芯倍率信息指示的机芯倍率对应的最大输入电流确定为该指定电流。
具体地，根据该指定电流和第一目标亮度，停止对补光灯的输入电流的调整：在对补光灯的输入电流进行调整的过程中，实时地或周期地确定拍摄 得到的图像的图像亮度以及补光灯的输入电流，当发现一时刻拍摄得到的图像的图像亮度与该第一目标亮度的差值已不大于该预设容差阈值，且发现一时刻补光灯的输入电流等于该指定电流时，停止对补光灯的输入电流的调整。也就是说，需要同时达到上述两个条件，则停止对补光灯的输入电流的调整，若只有其中一个条件达到时，则可以不停止对补光灯的输入电流的调整。
第三种实现方式中，根据机芯倍率信息和第一目标亮度中的至少一种因素，停止对补光灯的输入电流的调整。
在对补光灯的输入电流进行调整的过程中，对每一时刻拍摄得到的图像的图像亮度和补光灯的输入电流进行监测。判断当前所监测的图像亮度是否满足第一停止条件，并判断当前所监测的输入电流是否满足第二停止条件。其中，第一停止条件为：图像亮度与第一目标亮度的差值不大于预设容差阈值，第二停止条件为：输入电流等于指定电流。当所得到的判断结果中有至少一个的判断结果为是时，停止对补光灯的输入电流的调整。
也即是，在对补光灯的输入电流进行调整的过程中，不仅需要检测拍摄图像的图像亮度与该第一目标亮度的差值是否不大于该预设容差阈值，还需要检测补光灯的输入电流是否达到该指定电流，无论是先检测到拍摄图像的图像亮度与该第一目标亮度的差值不大于该预设容差阈值，还是先检测到补光灯的输入电流达到该指定电流，都停止调整补光灯的输入电流。若同时检测到拍摄图像的图像亮度与该第一目标亮度的差值不大于该预设容差阈值，且补光灯的输入电流达到该指定电流，也停止调整补光灯的输入电流。
例如，在增大对补光灯的输入电流的过程中，如果在增大到该指定电流之前，发现某一时刻拍摄得到的图像的图像亮度与该第一目标亮度的差值已不大于该预设容差阈值，则可以在拍摄得到的图像的图像亮度与该第一目标亮度的差值已不大于该预设容差阈值时，停止增大补光灯的输入电流。另外，在增大补光灯的输入电流的过程中，当发现某一时刻补光灯的输入电流等于该指定电流时，即使此时拍摄得到的图像的图像亮度与该第一目标亮度的差值仍大于该预设容差阈值，也需要停止增大补光灯的输入电流。
第四种实现方式中，根据机芯倍率信息，停止对补光灯的输入电流的调整。
其中，机芯倍率可以确定指定电流，指定电流即为补光灯能够达到的最大输入电流。当获取到摄像设备的机芯倍率信息后，即可以确定出该摄像设 备的机芯倍率，进而根据预先存储的机芯倍率和电流的对应关系，可以确定出该机芯倍率信息对应的电流，该电流即为指定电流。
在对补光灯的输入电流进行调整的过程中，对输入电流的大小进行监测，当监测到输入电流达到指定电流时，即可以停止对补光灯的输入电流的调整。
另外，还可以统计输入电流调整前后环境亮度的亮度提升幅度或亮度下降幅度，并根据统计的亮度提升幅度或亮度下降幅度推断该摄像设备所处环境空间的大小，具体地，当输入电流增加时，环境亮度的亮度提升幅度较大，则可以推断出摄像设备所处环境空间较小。当输入电流增加时，环境亮度的亮度提升幅度较小，则可以推断出摄像设备所处环境空间较大。这样，可以将推断出的环境空间的大小作为下次调整时的环境参考参数。
相关技术中，曝光方法一般仅通过调整光圈值、快门速度和增益值这3种因素实现，而本申请实施例的提供的曝光方法，在光圈值、快门速度和增益值这3种因素的基础上增加了补光灯的输入电流这个因素，也即是，可以通过调整光圈值、快门速度、增益值和补光灯的输入电流这4种因素进行曝光，从而提供了一种更多维的曝光方法，且这种曝光方法能够改善相关技术中补光灯突然开启或关闭时的曝光效果，优化用户体验，避免特定场景下日夜拍摄模式的频繁切换。
具体地，本申请实施例中，在摄像设备进行曝光的过程中，可以获取曝光过程中的曝光参数，当任一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，再对补光灯的输入电流进行调整，如此可以将曝光过程与补光灯的控制协调进行。由于当补光灯的输入电流为0时，补光灯关闭，当补光灯的输入电流大于0时，补光灯开启，因此通过调整补光灯的输入电流能够控制补光灯的开启和关闭。而且，补光灯的开启和关闭与摄像设备的日夜拍摄模式有关，当补光灯关闭时，摄像设备处于白天模式，当补光灯开启时，摄像设备处于夜间模式，因此通过调整补光灯的输入电流可以间接实现对日夜拍摄模式的切换，进而实现了将曝光过程与日夜切换过程协调进行，避免了两者单独进行时日夜拍摄模式的突然切换对曝光效果的影响。另外，由于补光灯的输入电流与补光灯的发光亮度有关，输入电流越大，发光亮度越大，因此通过在曝光过程中对补光灯的输入电流进行调整，还能够控制补光灯的发光亮度，从而可以避免特定场景下补光灯亮度过大所引起的日夜拍摄模式的频繁切换。
本申请实施例还提供一种曝光方法，包括如下步骤：
基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于第一目标亮度调整曝光参数；其中，第一环境亮度是指曝光之前的环境亮度，指定对应关系存储有多个环境亮度和多个环境亮度分别对应的目标亮度。
在该实施例中，该步骤与上述步骤201相同，参考上述步骤201的相关说明，在此不再赘述。
当基于第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件时，停止调整曝光参数，并获取当前的环境亮度；
在该实施例中，该步骤与上述步骤202相同，参考上述步骤202的相关说明，在此不再赘述。
当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根据电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于第一目标亮度。
在该实施例中，该步骤与上述步骤203相同，参考上述步骤203的相关说明，在此不再赘述。
在对补光灯的输入电流进行调整的过程，当补光灯的输入电流等于指定电流时，停止对补光灯的输入电流的调整，指定电流是根据摄像设备的机芯倍率信息确定得到。
在该实施例中，该步骤与上述第四种实现方式相同，参考上述第四种实现方式的相关说明，在此不再赘述。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
本说明书中的各个实施例均采用相关的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同 之处。尤其，对于装置实施例而言，由于其基本相似于方法实施例，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本申请保护的范围之内。

Claims (13)

  1. 一种曝光方法，其特征在于，应用于摄像设备中，所述方法包括：
    基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于所述第一目标亮度调整曝光参数；
    其中，所述第一环境亮度是指曝光之前的环境亮度，所述指定对应关系存储有多个环境亮度和所述多个环境亮度分别对应的目标亮度；
    当基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对所述补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于所述第一目标亮度；
    当对所述补光灯的输入电流进行调整的过程，发现一时刻拍摄得到的图像的图像亮度与所述第一目标亮度的差值不大于该预设容差阈值时，停止对所述补光灯的输入电流的调整，所述指定电流是根据所述摄像设备的机芯倍率信息确定得到。
  2. 如权利要求1所述的方法，其特征在于，所述发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，包括：
    发现一时刻的曝光参数满足曝光条件时，停止调整曝光参数，并获取当前的环境亮度；
    当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令。
  3. 如权利要求1或2所述的方法，其特征在于，所述发现一时刻拍摄得到的图像的图像亮度与所述第一目标亮度的差值不大于该预设容差阈值时，停止对所述补光灯的输入电流的调整，包括：
    当发现一时刻拍摄得到的图像的图像亮度与所述第一目标亮度的差值不大于该预设容差阈值，且所述补光灯的输入电流等于所述指定电流时，停止对所述补光灯的输入电流的调整。
  4. 如权利要求1或2所述的方法，其特征在于，所述发现一时刻拍摄得到的图像的图像亮度与所述第一目标亮度的差值不大于该预设容差阈值时，停止对所述补光灯的输入电流的调整，包括：
    对每一时刻拍摄得到的图像的图像亮度和所述补光灯的输入电流进行监 测；
    判断当前所监测的图像亮度是否满足第一停止条件，并判断当前所监测的输入电流是否满足第二停止条件，其中，所述第一停止条件为：图像亮度与所述第一目标亮度的差值不大于所述预设容差阈值，所述第二停止条件为：输入电流等于所述指定电流；
    当所得到的判断结果中有至少一个的判断结果为是时，停止对所述补光灯的输入电流的调整。
  5. 如权利要求1或2所述的方法，其特征在于，所述方法还包括：
    在对所述补光灯的输入电流进行调整的过程中，每隔第一预设时长获取第三环境亮度；
    当每获取到一个第三环境亮度时，根据获取的第三环境亮度和所述指定对应关系，确定拍摄图像需要达到的第二目标亮度；
    将进行曝光的所述第一目标亮度切换为所述第二目标亮度，并基于所述第二目标亮度调整曝光参数。
  6. 如权利要求2所述的方法，其特征在于，所述曝光参数包括光圈值、快门速度和增益值；
    所述获取当前的环境亮度之前，还包括：
    确定所述摄像设备的日夜拍摄模式；
    当所述摄像设备的日夜拍摄模式为白天模式，且基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的光圈值、快门速度和增益值分别不小于第一预设光圈值、第一预设快门速度和第一预设增益值时，确定发现的时刻的曝光参数满足曝光条件；
    所述当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对所述补光灯的输入电流进行调整，包括：
    当所获取的当前的环境亮度小于第一亮度阈值时，确定所获取的当前的环境亮度满足所述亮度条件，并触发第一调整指令，所述第一调整指令用于指示增大所述补光灯的输入电流；
    根据所述第一调整指令，通过所述补光灯的驱动电路增大所述补光灯的输入电流。
  7. 如权利要求2所述的方法，其特征在于，所述曝光参数包括光圈值、 快门速度和增益值；
    所述获取当前的环境亮度之前，还包括：
    确定所述摄像设备的日夜拍摄模式；
    当所述摄像设备的日夜拍摄模式为夜间模式，且基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的光圈值、快门速度和增益值分别不大于第二预设光圈值、第二预设快门速度和第二预设增益值时，确定发现的时刻的曝光参数满足曝光条件，所述第二预设光圈值、第二预设快门速度和第二预设增益值分别小于所述第一预设光圈值、第一预设快门速度和第一预设增益值；
    所述当所获取的当前的环境亮度满足亮度条件时，触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对补光灯的输入电流进行调整，包括：
    当所获取的当前的环境亮度大于第二亮度阈值时，确定所获取的当前的环境亮度满足所述亮度条件，并触发第二调整指令，所述第二调整指令用于指示减小所述补光灯的输入电流；
    根据所述第二调整指令，通过所述补光灯的驱动电路减小所述补光灯的输入电流。
  8. 如权利要求1或2所述的方法，其特征在于，所述触发电流调整指令之前，还包括：
    获取所述摄像设备的机芯倍率信息；
    当基于所述机芯倍率信息确定所述摄像设备未处于变倍过程时，执行所述触发电流调整指令的步骤。
  9. 如权利要求1或2所述的方法，其特征在于，所述触发电流调整指令之前，还包括：
    确定所述电流调整指令的已触发次数；
    当所述已触发次数小于预设次数阈值时，执行所述触发电流调整指令的步骤；
    所述触发电流调整指令之后，还包括：
    将所述已触发次数加N，所述N为正整数。
  10. 如权利要求9所述的方法，其特征在于，所述将所述已触发次数加N，包括：
    确定当前触发所述电流调整指令的第一时间点，以及在所述第一时间点之前最近一次触发电流调整指令的第二时间点；
    当所述第一时间点和所述第二时间点之间的相距时长不大于第二预设时长时，将所述已触发次数加N。
  11. 如权利要求10所述的方法，其特征在于，所述确定当前触发所述电流调整指令的第一时间点，以及在所述第一时间点之前最近一次触发所述电流调整指令的第二时间点之后，还包括：
    当所述第一时间点和所述第二时间点之间的相距时长大于所述第一预设时长时，将所述已触发次数清零。
  12. 如权利要求9所述的方法，其特征在于，所述确定所述电流调整指令的已触发次数之后，还包括：
    当所述已触发次数不小于所述预设次数阈值时，维持所述补光灯的当前输入电流不变；
    根据最近一次触发电流调整指令的时间点，确定所述补光灯的当前输入电流的维持时长；
    当所述维持时长不小于第三预设时长时，将所述已触发次数清零。
  13. 一种曝光方法，其特征在于，所述方法包括：
    基于第一环境亮度和存储的指定对应关系，确定拍摄图像需要达到的第一目标亮度，并基于所述第一目标亮度调整曝光参数；
    其中，所述第一环境亮度是指曝光之前的环境亮度，所述指定对应关系存储有多个环境亮度和所述多个环境亮度分别对应的目标亮度；
    当基于所述第一目标亮度调整曝光参数的过程中，发现一时刻的曝光参数满足曝光条件且该时刻的环境亮度满足亮度条件时，停止调整曝光参数，并触发电流调整指令，并根据所述电流调整指令，通过补光灯的驱动电路对所述补光灯的输入电流进行调整，以使得拍摄得到的图像的图像亮度趋近于所述第一目标亮度；
    在对所述补光灯的输入电流进行调整的过程，当所述补光灯的输入电流等于指定电流时，停止对所述补光灯的输入电流的调整，所述指定电流是根据所述摄像设备的机芯倍率信息确定得到。
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