CN109040609B - Exposure control method, exposure control device, electronic equipment and computer-readable storage medium - Google Patents

Exposure control method, exposure control device, electronic equipment and computer-readable storage medium Download PDF

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Publication number
CN109040609B
CN109040609B CN201810962773.6A CN201810962773A CN109040609B CN 109040609 B CN109040609 B CN 109040609B CN 201810962773 A CN201810962773 A CN 201810962773A CN 109040609 B CN109040609 B CN 109040609B
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exposure
image
frame
acquired
determining
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CN109040609A (en
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胡孔勇
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/2351Circuitry for evaluating the brightness variations of the object
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/225Television cameras ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, camcorders, webcams, camera modules specially adapted for being embedded in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/235Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor
    • H04N5/2355Circuitry or methods for compensating for variation in the brightness of the object, e.g. based on electric image signals provided by an electronic image sensor by increasing the dynamic range of the final image compared to the dynamic range of the electronic image sensor, e.g. by adding correct exposed portions of short and long exposed images

Abstract

The invention provides an exposure control method, an exposure control device and electronic equipment, wherein the method comprises the following steps: the method comprises the steps of determining that a current shooting scene belongs to a night scene, identifying a night scene mode applicable to the current shooting scene according to the jitter degree of imaging equipment, determining exposure parameters of images to be acquired of each frame according to the night scene mode, and performing exposure control by adopting the exposure parameters, so that the purpose of dynamically adjusting the night scene mode and the exposure parameters based on different shooting scenes is achieved, the imaging quality of the images during the night scene shooting is improved, and the technical problem that the shooting quality is poor in some scenes due to the fact that the night scene shooting mode is single and cannot be applicable to all shooting scenes in the related technology is solved.

Description

Exposure control method, exposure control device, electronic equipment and computer-readable storage medium
Technical Field
The invention relates to the technical field of mobile terminals, in particular to an exposure control method and device and electronic equipment.
Background
With the development of mobile terminal technology and image processing technology, people have higher and higher requirements on shooting, and even at night with dark ambient light, people want to acquire high-quality images.
At present, in a night scene, a mobile terminal mostly adopts a single night scene mode to shoot, and the intensity and the position of a light source in the night scene environment are uncertain, so that the shooting environment is complex and changeable, therefore, the single night scene mode cannot be applied to all scenes, and the shooting effect is poor in some scenes.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention provides an exposure control method, which is characterized in that when shooting a night scene, a shot night scene mode is determined according to the jitter degree, and exposure parameters adopted by each frame of image in the currently adopted night scene mode are determined, so that the night scene mode and the exposure parameters are dynamically adjusted based on different shooting scenes, and the imaging quality of the image during shooting the night scene is improved.
The invention provides an exposure control device.
The invention provides an electronic device.
The invention provides a computer readable storage medium.
An embodiment of one aspect of the present invention provides an exposure control method, including:
determining that the current shooting scene belongs to a night scene;
identifying a night scene mode applicable to the current shooting scene according to the shaking degree of the imaging equipment;
determining exposure parameters of each frame of image to be acquired according to the night scene mode;
and carrying out exposure control by adopting the exposure parameters.
An embodiment of another aspect of the present invention provides an exposure control apparatus, including:
the scene determining module is used for determining that the current shooting scene belongs to a night scene;
the identification module is used for identifying a night scene mode applicable to the current shooting scene according to the shaking degree of the imaging equipment;
the parameter determining module is used for determining exposure parameters of each frame of image to be acquired according to the night scene mode;
and the control module is used for carrying out exposure control by adopting the exposure parameters.
An embodiment of another aspect of the present invention provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the exposure control method according to the previous aspect when executing the program.
Yet another embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored, wherein instructions in the storage medium, when executed by a processor, implement the exposure control method according to the previous aspect.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps of determining that a current shooting scene belongs to a night scene, identifying a night scene mode applicable to the current shooting scene according to the jitter degree of imaging equipment, determining exposure parameters of images to be acquired of each frame according to the night scene mode, and performing exposure control by adopting the exposure parameters, so that different night scene modes and exposure parameters are adopted based on different shooting scenes when the night scene is shot, and the shooting effect is improved.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flowchart of an exposure control method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating another exposure control method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating another exposure control method according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating another exposure control method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an exposure control apparatus according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating an internal structure of an electronic device 200 according to an embodiment; and
FIG. 7 is a schematic diagram of image processing circuitry 90 in one embodiment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An exposure control method, an apparatus, and an electronic device according to embodiments of the present invention are described below with reference to the drawings.
Fig. 1 is a flowchart illustrating an exposure control method according to an embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
step 101, determining that the current shooting scene belongs to a night scene.
As a possible implementation mode, according to a current shooting scene, a preview image of the current scene is obtained by an image acquisition module, image feature extraction is carried out on the preview image, the extracted image feature is input into an identification model, and the current shooting scene belongs to a night scene according to a scene type output by the identification model, wherein the identification model learns to obtain a corresponding relation between the image feature and the scene type.
As another possible implementation manner, a user operation for scene switching is detected, and when the user operation for switching to a night scene is detected, the ambient brightness is detected to obtain brightness information. And determining that the current shooting scene belongs to a night scene according to the brightness information. For example, the brightness level can be measured by a brightness index Lix _ index, wherein the larger the value of the brightness information is, the lower the brightness of the current scene is represented. And comparing the acquired brightness information with a preset brightness value, and determining that the current shooting scene belongs to a night scene if the acquired brightness information is greater than the preset brightness value. On the contrary, if the acquired brightness information is smaller than the preset brightness value, it is determined that the current shooting scene belongs to a non-night scene, and in the non-night scene, a high dynamic range mode is adopted for imaging, wherein in the high dynamic range imaging, a higher dynamic range can be acquired by setting different exposure compensation values, for example, 3 frames of images can be acquired, and the interval of the exposure compensation values is [ -4, +1 ].
And 102, identifying a night scene mode suitable for the current shooting scene according to the shaking degree of the imaging equipment.
Specifically, the method comprises the steps of obtaining the shaking degree of the imaging equipment, and determining to adopt a single-frame night scene mode if the shaking degree is larger than or equal to a first shaking threshold; if the jitter degree is smaller than the first jitter threshold and larger than the second jitter threshold, determining to adopt a handheld night scene mode; and if the jitter degree is less than or equal to a second jitter threshold, determining to adopt a foot stool night scene mode, wherein the first jitter threshold is greater than the second jitter threshold, the number of frames of the image to be acquired in the hand-held night scene mode is greater than one frame, and the number of frames of the image to be acquired in the foot stool night scene mode is greater than the number of frames in the hand-held night scene mode.
And 103, determining exposure parameters of the image to be acquired of each frame according to the night scene mode.
The exposure parameters include exposure duration, sensitivity, and exposure compensation value.
Specifically, the preset light sensitivity of each frame of image to be collected is determined according to a night scene mode, wherein the preset light sensitivity in the handheld night scene mode is greater than the preset light sensitivity in the foot stool night scene mode. Determining a preset exposure compensation value of each frame of image to be acquired according to a night scene mode, determining a reference exposure amount according to brightness information of a preview image, determining a target exposure amount of each frame of image to be acquired according to the reference exposure amount and the preset exposure compensation value of each frame of image to be acquired, and determining exposure duration of each frame of image to be acquired according to the target exposure amount of each frame of image to be acquired and preset light sensitivity of each frame of image to be acquired.
In the embodiment of the invention, because the shake is large in the handheld night scene mode, in order to improve the imaging quality, avoid the occurrence of afterimages caused by the shake and reduce the number of frames of the shot images in the handheld night scene mode as much as possible. In addition, in the night scene mode, in order to enable both the highlight area and the low-light area in the image to have proper exposure, the interval between the exposure compensation values of the multi-frame image is set to be small, so that the highlight area and the low-light area in the final composite image can be in smooth transition. In order to simultaneously satisfy the small interval between the exposure compensation values of the multi-frame images and the small number of frames of the shot images in the handheld night scene mode, the value range of the exposure compensation values in the handheld night scene mode is usually set to be small, so that the value range of the exposure compensation values in the handheld night scene mode is smaller than the value range of the exposure compensation values in the tripod night scene mode.
Optionally, the shake degree of the handheld night view mode may be further subdivided, and in the handheld night view mode, a corresponding relationship exists between the shake degree and the exposure parameter, as a possible implementation manner, when the handheld night view mode is in, the corresponding relationship between the shake degree and the exposure parameter is read, and the corresponding relationship specifically is: the degree of shaking has a positive relationship with the sensitivity in the exposure parameters, that is, the greater the degree of shaking, the greater the sensitivity; the degree of shake has an inverse relationship with the exposure time period in the exposure parameters, that is, the larger the degree of shake, the shorter the exposure time period, because, although the lower the sensitivity, the less noise in the image, the longer the exposure time period required with the same exposure amount. In order to adapt to the shaking condition and avoid the occurrence of image sticking caused by overlong time length, the sensitivity can be properly improved according to the shaking condition so as to reduce the exposure time length. Meanwhile, the shaking degree has an inverse relationship with the value range of the exposure compensation value in the exposure parameter, because the larger the shaking degree is, in order to improve the imaging quality, the ghost image caused by shaking is avoided, and the frame number of the shot image can be properly reduced. In addition, in order to enable both the highlight region and the low-light region in the image to have suitable exposure, the smaller the interval between the exposure compensation values of the multi-frame image is set, so that the highlight region and the low-light region in the final composite image can be smoothly transited. Therefore, the larger the degree of shake is, the smaller the range of the exposure compensation value tends to be set in order to satisfy both the smaller interval between the exposure compensation values of the plurality of frames of images and the smaller number of frames of the captured image.
And then, inquiring the corresponding relation according to the shaking degree of the imaging equipment to obtain the exposure parameters of the image to be acquired of each frame. By further subdividing the jitter degree in the handheld night scene mode, different exposure parameters are used based on different jitter degrees in the handheld night scene mode, and the imaging quality of the image in the handheld night scene mode is improved.
And 104, adopting the exposure parameters to carry out exposure control.
Specifically, exposure control is performed by using the determined exposure parameters of the to-be-acquired images of each frame according to the determined night scene mode.
In the exposure control method of the embodiment, it is determined that the current shooting scene belongs to a night scene, a night scene mode applicable to the current shooting scene is identified according to the jitter degree of the imaging device, exposure parameters of each frame of image to be acquired are determined according to the night scene mode, exposure control is performed by adopting the exposure parameters, the night scene mode and the exposure parameters are dynamically adjusted based on different shooting scenes, the imaging quality of the image during night scene shooting is improved, and the technical problem that in the related technology, the night scene shooting mode is single, and all shooting scenes cannot be applicable, and the shooting quality is poor in some scenes is solved.
Based on the foregoing embodiment, this embodiment provides another exposure control method, which further clearly illustrates that in the foregoing step 102, the night scene mode applicable to the current shooting scene is identified according to the shake degree of the imaging device, and fig. 2 is a flowchart of another exposure control method provided in this embodiment of the present invention.
As shown in fig. 2, step 102 may include the following sub-steps:
step 1021, acquiring a shake degree of the imaging device.
Specifically, a sensor is arranged in the imaging device, the acquired displacement information is acquired, and the shaking degree of the imaging device is determined according to the displacement information. As a possible implementation manner, the sensor may be a gyroscope, the gyroscope may output displacement information of three axes, x, y, and z, absolute values of the displacement information corresponding to the three axes are obtained and added and summed by obtaining the displacement information of the three axes of the gyroscope, the sum of the displacement information corresponding to the three axes is represented by S, and the jitter degree of the imaging device is indicated by the value of the displacement information S, that is, the value of the jitter degree is equal to the value of the displacement information S.
In step 1022, it is determined whether the jitter degree is greater than or equal to the first jitter threshold, if so, go to step 1023, otherwise, go to step 1024.
And step 1023, determining to adopt a single-frame night scene mode.
Specifically, if the jitter degree is greater than or equal to the first jitter threshold, the current jitter is large, and the single-frame image is obtained by directly adopting the single-frame night view mode, because when the jitter degree is large, if a plurality of frame images are collected, the difference of each frame image may be large, and the synthesis of the obtained images cannot be performed, therefore, when the jitter is large, only the single-frame image is collected by adopting the single-frame night view mode.
Step 1024, determining whether the jitter degree is smaller than or equal to the first jitter threshold and larger than the second jitter threshold, if yes, executing step 1026, and if not, executing step 1025.
Wherein the second jitter threshold is less than the first jitter threshold.
And step 1025, determining to adopt a handheld night scene mode.
Specifically, if the jitter degree is not greater than or equal to the first jitter threshold, it is determined that the current jitter is not very large, and it is further determined whether the current jitter degree is less than or equal to the first jitter threshold and greater than the second jitter threshold, and if so, the handheld night view mode is adopted.
The number of frames of the image to be acquired in the handheld night view mode is greater than one frame, for example, may be 7 frames, where the exposure parameters adopted in each frame are not exactly the same, and the following embodiments will describe the method for determining the exposure parameters in detail.
And step 1026, determining to adopt a night scene mode.
Specifically, if the current jitter degree is not less than or equal to the first jitter threshold and is greater than the second jitter threshold, the pod night view mode is adopted.
The frame number of the image to be captured in the pod night view mode is greater than that in the handheld night view mode, that is, the corresponding jitter in the pod night view mode is very small, and the imaging device itself has an anti-jitter elimination strategy such as Optical Image Stabilization (OIS), so that the jitter in the pod night view mode is very small, and therefore the shooting time is long, and a high-quality picture is obtained.
In the exposure control method of the embodiment, the shake degree of the imaging device is obtained, the night scene modes required to be adopted are determined to be the tripod night scene mode, the handheld night scene mode and the single-frame night scene mode according to the shake degree, the night scene modes are subdivided, different night scene modes are adopted for different scenes shot at night, and the imaging quality of the acquired image is improved.
Based on the foregoing embodiment, an exposure control method is further provided in the embodiment of the present invention, which further clearly illustrates how to determine exposure parameters of an image to be acquired in each frame according to a determined night scene mode, fig. 3 is a schematic flow chart of another exposure control method provided in the embodiment of the present invention, as shown in fig. 3, and step 103 may further include the following sub-steps:
and step 1031, determining preset light sensitivity of each frame of image to be acquired according to the night scene mode.
In one scenario, if the night view mode is the handheld night view mode, a sensitivity iso preset for each frame of the image to be acquired in the handheld night view mode is determined, for example, the sensitivity is 200 iso.
In another scenario, if the night view mode is the pod night view mode, a sensitivity iso preset for each frame of the image to be acquired in the pod night view mode is determined, for example, the sensitivity is 100 iso.
It should be noted that, in this embodiment, the preset sensitivities of the images to be acquired of each frame in the handheld night view mode may be completely the same, or may have smaller differences.
It should be understood that the preset value of the light sensitivity in the foot stool night view mode is less than the preset light sensitivity in the hand-held night view mode because the jitter degree in the foot stool night view mode is less than the jitter degree in the hand-held night view mode, and because the jitter degree is smaller, when acquiring the to-be-acquired image of each frame, a lower light sensitivity can be adopted, thereby prolonging the exposure time, reducing the noise of the to-be-acquired image, and improving the imaging quality of the image.
And 1032, determining a preset exposure compensation value of each frame of image to be acquired according to the night scene mode.
Specifically, based on different night scene modes, exposure compensation values preset for different frames of images to be standby are determined.
In one scenario, if the night view mode is the tripod night view mode, the preset exposure Compensation value of each frame of the image to be captured is determined, for example, in the tripod night view mode, the image to be captured is set to 17 frames, the range of the exposure Compensation value EV (exposure Compensation value) is set to [ -6, +2] EV, and the interval of the exposure Compensation value of each frame is set to 0.5 EV.
In another scenario, if the night view mode is the handheld night view mode, the preset exposure compensation value of each frame of the image to be captured is determined, for example, in the handheld night view mode, the image to be captured is set to 7 frames, and the range of the exposure compensation value is set to [ -6, +1] EV, for example, corresponding to 7 frames of the image to be captured, and the corresponding exposure compensation value may be [ -6, -3,0, +1, +1, +1, +1] EV, respectively.
It should be noted that, in practical applications, the exposure compensation value may also be changed according to the ambient brightness and the captured image, and the range of the exposure is adjusted to be smaller, for example, in the handheld night view mode, the range of the exposure compensation value is adjusted to [ -5, +1] EV.
Step 1033, determining a reference exposure amount according to the brightness information of the preview image.
Specifically, as a possible implementation manner, the luminance information of the preview image corresponding to the current shooting scene is measured by a photometry module in the electronic device, and the measured luminance information is converted at a set low sensitivity to determine the reference exposure amount, which is set as EVO, for example, when the sensitivity measured by the photometry module is 500iso, the exposure time is 50 milliseconds (ms), and the target sensitivity is 100iso, the conversion result is 100iso, the exposure time is 250ms, and the sensitivity is 100iso and the exposure time is 250ms, which are used as the reference exposure amount EVO.
Note that the EVO is not a fixed value but a value that changes in accordance with the brightness information of the preview image, and when the ambient brightness changes, the brightness information of the preview image changes, and the reference exposure amount EV0 also changes.
It should be noted that the execution of step 1031, step 1032 and step 1033 is not time-sequenced.
And 1034, determining the target exposure of each frame of image to be acquired according to the reference exposure and the preset exposure compensation value of each frame of image to be acquired.
For example, in the handheld night scene mode, the corresponding preset exposure compensation values of 7 frames of images to be collected are-6 EV, -3EV,0EV, +1EV, +1EV,wherein "+" indicates increasing exposure on the basis of the reference exposure determined by photometry, "-" indicates decreasing exposure, the corresponding number is the number of stages of compensation exposure, the target exposure of each frame of image to be collected is determined according to the preset exposure compensation value and the reference exposure of each frame of image to be collected, for example, if the exposure compensation value of one frame of image is-6 EV, the number-6 is the number of stages of compensation exposure, and the reference exposure is EVO, the determined target exposure of the frame of image is EVO 2-6EVO/64, namely, the brightness of the frame image acquisition is reduced; if the exposure compensation value of one frame of image is 1EV and the reference exposure amount is EVO, the determined target exposure amount of the frame of image is EVO × 2, that is, 2 times EVO, that is, the brightness of the frame of image is increased.
It should be noted that, in the tripod night view mode, the determination method of the target exposure of each frame of the image to be acquired is the same, and details are not described here.
And 1035, determining the exposure duration of each frame of image to be acquired according to the target exposure of each frame of image to be acquired and the preset sensitivity of each frame of image to be acquired.
In the embodiment of the invention, in the night scene mode, when each frame of image is collected, the aperture value is fixed, the target exposure amount is determined by the sensitivity and the exposure duration for each frame of image to be collected, and when the sensitivity is determined, the corresponding exposure duration can be determined.
For example, the sensitivity IOS value and the exposure time period corresponding to the reference exposure amount are divided into: 100iso and 250ms, the preset sensitivity of a frame of image to be acquired is 100iso, the exposure compensation value is-3 EV, and the target exposure time length of the frame of image to be acquired isThat is, 32ms, i.e., the exposure duration is reduced, and similarly, when the exposure compensation value is +1EV, the obtained exposure duration is 500ms, i.e., the exposure duration is increased. Similarly, the exposure time of each frame can be determined. By setting a wider dynamic range, each to be collectedThe frame images are acquired by adopting different exposure time lengths respectively, so that details of all parts in the images can be clearly imaged under the control of the different exposure time lengths, and the imaging effect is improved.
In the embodiment of the invention, the minimum value of the exposure duration supported by the shutter is 10 milliseconds (ms), in a possible scene, when a camera is irradiated by a relatively large amount of light in a shooting scene, a light measuring device can mistakenly assume that the light of the current scene is relatively bright, so that the determined reference exposure amount is relatively small, namely the exposure duration corresponding to the reference exposure amount is relatively small, further, when the exposure duration of each frame of image to be acquired is calculated by taking the reference exposure amount as an EVO, and the exposure compensation value is relatively-6E, the calculated exposure duration is possibly 10ms lower than the minimum value of the preset exposure duration, for example, 8ms, the exposure duration is increased from 8ms to 10ms, and the corresponding magnification compensation value is determined to be increased, so that a certain shooting brightness is ensured when the darkest frame is acquired, and simultaneously, each frame of image to be acquired is increased according to the magnification compensation value, the brightness of the acquired image to be acquired is increased linearly, so that the transition of halation is natural when the acquired image is synthesized in the subsequent images, and the effect of the synthesized image is improved.
In another possible scenario, when the environment is very dark, the longest exposure time of a single frame calculated by using the reference exposure may be longer than the maximum value set by the exposure time, for example, 5 seconds, for example, when the sensitivity of the reference exposure is 100iso, the exposure time is 2 seconds, and the corresponding exposure compensation value is +2EV, the preset sensitivity of the image to be captured is also 100iso, the calculated exposure time is 8 seconds and exceeds the preset maximum value by 5 seconds, the exposure time of the frame needs to be reduced to the preset maximum value by 5 seconds, the reduction magnification is determined, and the sensitivity is adjusted by the magnification, so as to prevent the exposure time from being too long, after the longest exposure time is compressed, if the exposure amount during exposure needs to be adjusted, the brightness during shooting is increased only by appropriately increasing the value of the sensitivity, and the light sensitivity value cannot exceed the upper limit of the preset light sensitivity value when increasing, for example, 550iso, because setting a larger sensitivity increases noise in the picture, reducing the imaging quality.
It should be noted that, when the night view mode is the single-frame night view mode, it is difficult to acquire a high-quality image due to large jitter, and therefore, only one frame of image is acquired, and the image exposure control is performed on the image to be acquired in an exposure time shorter than the exposure time of the handheld night view mode and the tripod night view mode, which is not described in detail in this embodiment.
In the exposure control method of the embodiment of the invention, the preset light sensitivity and the preset exposure compensation value of each frame of image to be collected are determined according to different night scene modes, the reference exposure amount is determined according to the brightness information of a preview image, the target exposure amount corresponding to each frame of image to be collected is determined according to the reference exposure amount, the exposure time length is determined according to the target exposure amount and the preset light sensitivity of each preset frame of image to be collected, so that the exposure parameter of each frame of image to be collected is determined, different exposure parameters are set under different night scene modes, so that a plurality of frames of images to be shot are obtained under a handheld night scene mode with larger vibration, the exposure time length is reduced for image collection, a plurality of frames of images to be shot are obtained under a tripod night scene mode with smaller jitter, the exposure time length is increased for image collection, and the exposure parameter during night scene shooting is dynamically adjusted under the night scene mode, the imaging quality of the image during night scene shooting is improved.
Based on the foregoing embodiments, an exposure control method is further provided in an embodiment of the present invention, and fig. 4 is a schematic flow chart of another exposure control method provided in an embodiment of the present invention, as shown in fig. 4, after step 104, the method may further include the following steps:
step 401, acquiring each frame of image acquired under exposure control, and synthesizing each frame of image to obtain an imaging image.
Specifically, each frame of image acquired under the control of the corresponding exposure parameter is acquired according to the determined exposure parameter of each frame of image to be acquired, the acquired frames of images are aligned to eliminate the influence of jitter, meanwhile, a moving object in the image is detected to eliminate ghosting, and then, corresponding pixels in each frame of image are weighted and synthesized to obtain a corresponding frame of target image. Because the acquired frame images have different exposure parameters and correspond to different exposure durations, the dark part in the finally output imaging image can be compensated by the corresponding pixel information in the image with longer exposure duration and the bright part can be suppressed by the corresponding pixel information in the image with shorter exposure duration by synthesizing the frame images, so that the finally output synthesized imaging image has no overexposed area and underexposed area, and the brightness and the darkness of the image are excessively uniform, thereby having better imaging effect. Meanwhile, in the synthesis process, the amplitude and the position of the noise generated by the current are random, so that the noise can be mutually offset when a plurality of images are superposed and synthesized, and the imaging quality is improved.
In the exposure control method, the current shooting scene is determined to belong to a night scene, a night scene mode applicable to the current shooting scene is identified according to the jitter degree of imaging equipment, the exposure parameters of the images to be acquired of each frame are determined according to the night scene mode, exposure control is performed by adopting the exposure parameters, imaging images are obtained by synthesizing the obtained multi-frame images, and therefore when the night scene is shot, the multi-frame images are obtained by adopting different night scene modes and exposure parameters based on different shooting scenes, the multi-frame images are synthesized, bright part details and corresponding transition are reserved, and the imaging effect is improved.
In order to implement the above embodiments, the present invention further provides an exposure control apparatus.
Fig. 5 is a schematic structural diagram of an exposure control apparatus according to an embodiment of the present invention.
As shown in fig. 5, the apparatus includes: a scene determination module 51, an identification module 52, a parameter determination module 53 and a control module 54.
And a scene determining module 51, configured to determine that the current shooting scene belongs to a night scene.
And the identifying module 52 is configured to identify a night scene mode applicable to the current shooting scene according to the shake degree of the imaging device.
And the parameter determining module 53 is configured to determine an exposure parameter of each frame of the image to be acquired according to the night scene mode.
And a control module 54 for performing exposure control using the exposure parameters.
Further, in a possible implementation manner of the embodiment of the present invention, the apparatus further includes: and a synthesis module.
The synthesis module is used for acquiring each frame of image acquired under exposure control; and synthesizing the frame images to obtain an imaging image.
In a possible implementation manner of the embodiment of the present invention, the identification module 52 may further include: an acquisition unit and a judgment unit.
An acquisition unit configured to acquire a shake degree of the imaging apparatus.
The judging unit is used for determining that a single-frame night scene mode is adopted if the jitter degree is greater than or equal to a first jitter threshold; if the jitter degree is smaller than the first jitter threshold and larger than a second jitter threshold, determining to adopt a handheld night scene mode; if the jitter degree is less than or equal to the second jitter threshold, determining to adopt a night scene mode of the tripod;
the first shaking threshold is larger than the second shaking threshold, the number of frames of the image to be collected in the handheld night scene mode is larger than one frame, and the number of frames of the image to be collected in the foot stool night scene mode is larger than the number of frames in the handheld night scene mode.
As a possible implementation manner, the acquiring unit is configured to acquire the acquired displacement information from a sensor provided in the imaging device; based on the displacement information, a degree of shake of the imaging apparatus is determined.
As a possible implementation manner, the parameter determining module 53 is specifically configured to:
determining preset light sensitivity of each frame of image to be acquired according to the night scene mode;
the preset light sensitivity in the handheld night scene mode is greater than the preset light sensitivity in the foot stool night scene mode.
As a possible implementation manner, the parameter determining module 53 is specifically further configured to:
determining exposure compensation values preset by each frame of image to be acquired according to the night scene mode;
determining the reference exposure according to the brightness information of the preview image;
determining the target exposure of each frame of image to be acquired according to the reference exposure and the preset exposure compensation value of each frame of image to be acquired;
and determining the exposure time of each frame of image to be acquired according to the target exposure of each frame of image to be acquired and the preset light sensitivity of each frame of image to be acquired.
As a possible implementation manner, the value range of the exposure compensation value in the handheld night view mode is smaller than the value range of the exposure compensation value in the tripod night view mode.
As a possible implementation manner, the parameter determining module 53 may be further configured to:
if the hand-held night scene mode is adopted, reading the corresponding relation between the jitter degree and the exposure parameter;
inquiring the corresponding relation according to the shaking degree of the imaging equipment to obtain the exposure parameters of each frame of image to be acquired; the exposure parameters include exposure duration, sensitivity and exposure compensation value.
As a possible implementation, the degree of shaking has a positive relationship with the sensitivity in the exposure parameters; the jitter degree has an inverse relation with the exposure duration in the exposure parameters; the jitter degree has an inverse relationship with the range of values of the exposure compensation value in the exposure parameter.
As a possible implementation manner, the scene determining module 51 is specifically configured to:
extracting image features of the preview image; inputting the extracted image characteristics into an identification model, and determining that the current shooting scene belongs to a night scene according to the scene type output by the identification model; wherein the recognition model has learned the correspondence between the image features and the scene type.
As another possible implementation manner, the scene determining module 51 is specifically further configured to:
detecting a user operation for scene switching; when user operation of switching to a night scene is detected, detecting the ambient brightness to obtain brightness information; and determining that the current shooting scene belongs to a night scene according to the brightness information.
It should be noted that the foregoing explanation of the method embodiment is also applicable to the apparatus of this embodiment, and is not repeated herein.
In the exposure control device of this embodiment, it is determined that the current shooting scene belongs to a night scene, a night scene mode applicable to the current shooting scene is identified according to a shake degree of the imaging device, exposure parameters of each frame of an image to be acquired are determined according to the night scene mode, and exposure control is performed by using the exposure parameters, so that when shooting the night scene, different night scene modes and exposure parameters are adopted based on different shooting scenes, a shooting effect is improved, and the technical problem that in the related art, the mode of shooting the night scene is single, and all shooting scenes cannot be applicable, and the shooting quality is poor in some scenes is solved.
In order to implement the foregoing embodiment, an embodiment of the present invention further provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the exposure control method as described in the aforementioned method embodiments.
Fig. 6 is a schematic diagram of the internal structure of the electronic device 200 in one embodiment. The electronic device 200 includes a processor 60, a memory 50 (e.g., a non-volatile storage medium), an internal memory 82, a display screen 83, and an input device 84 connected by a system bus 81. The memory 50 of the electronic device 200 stores, among other things, an operating system and computer-readable instructions. The computer readable instructions can be executed by the processor 60 to implement the control method of the embodiment of the present application. The processor 60 is used to provide computing and control capabilities that support the operation of the overall electronic device 200. The internal memory 50 of the electronic device 200 provides an environment for the execution of computer readable instructions in the memory 52. The display 83 of the electronic device 200 may be a liquid crystal display or an electronic ink display, and the input device 84 may be a touch layer covered on the display 83, a button, a trackball or a touch pad arranged on a housing of the electronic device 200, or an external keyboard, a touch pad or a mouse. The electronic device 200 may be a mobile phone, a tablet computer, a notebook computer, a personal digital assistant, or a wearable device (e.g., a smart bracelet, a smart watch, a smart helmet, smart glasses), etc. Those skilled in the art will appreciate that the configuration shown in fig. 6 is merely a schematic diagram of a portion of the configuration associated with the present application, and does not constitute a limitation on the electronic device 200 to which the present application is applied, and that a particular electronic device 200 may include more or less components than those shown in the drawings, or combine certain components, or have a different arrangement of components.
Referring to fig. 7, the electronic device 200 according to the embodiment of the present disclosure includes an Image Processing circuit 90, and the Image Processing circuit 90 may be implemented by hardware and/or software components, including various Processing units defining an ISP (Image Signal Processing) pipeline. FIG. 7 is a schematic diagram of image processing circuitry 90 in one embodiment. As shown in fig. 7, for convenience of explanation, only aspects of the image processing technology related to the embodiments of the present application are shown.
As shown in fig. 7, the image processing circuit 90 includes an ISP processor 91 (the ISP processor 91 may be the processor 60) and a control logic 92. The image data captured by the camera 93 is first processed by the ISP processor 91, and the ISP processor 91 analyzes the image data to capture image statistics that may be used to determine one or more control parameters of the camera 93. The camera 93 may include one or more lenses 932 and an image sensor 934. Image sensor 934 may include an array of color filters (e.g., Bayer filters), and image sensor 934 may acquire light intensity and wavelength information captured by each imaging pixel and provide a set of raw image data that may be processed by ISP processor 91. The sensor 94 (e.g., a gyroscope) may provide parameters of the acquired image processing (e.g., anti-shake parameters) to the ISP processor 91 based on the type of interface of the sensor 94. The sensor 94 interface may be a SMIA (Standard Mobile Imaging Architecture) interface, other serial or parallel camera interface, or a combination thereof.
In addition, the image sensor 934 may also send raw image data to the sensor 94, the sensor 94 may provide the raw image data to the ISP processor 91 based on the type of interface of the sensor 94, or the sensor 94 may store the raw image data in the image memory 95.
The ISP processor 91 processes the raw image data pixel by pixel in a variety of formats. For example, each image pixel may have a bit depth of 8, 10, 12, or 14 bits, and the ISP processor 91 may perform one or more image processing operations on the raw image data, gathering statistical information about the image data. Wherein the image processing operations may be performed with the same or different bit depth precision.
The ISP processor 91 may also receive image data from the image memory 95. For example, the sensor 94 interface sends raw image data to the image memory 95, and the raw image data in the image memory 95 is then provided to the ISP processor 91 for processing. The image Memory 95 may be the Memory 50, a portion of the Memory 50, a storage device, or a separate dedicated Memory within the electronic device, and may include a DMA (Direct Memory Access) feature.
Upon receiving raw image data from the image sensor 934 interface or from the sensor 94 interface or from the image memory 95, the ISP processor 91 may perform one or more image processing operations, such as temporal filtering. The processed image data may be sent to image memory 95 for additional processing before being displayed. The ISP processor 91 receives the processed data from the image memory 95 and performs image data processing on the processed data in the raw domain and in the RGB and YCbCr color spaces. The image data processed by ISP processor 91 may be output to display 97 (display 97 may include display screen 83) for viewing by a user and/or further processed by a Graphics Processing Unit (GPU). Further, the output of the ISP processor 91 may also be sent to an image memory 95, and the display 97 may read image data from the image memory 95. In one embodiment, image memory 95 may be configured to implement one or more frame buffers. Further, the output of the ISP processor 91 may be transmitted to an encoder/decoder 96 for encoding/decoding the image data. The encoded image data may be saved and decompressed before being displayed on the display 97 device. The encoder/decoder 96 may be implemented by a CPU or GPU or coprocessor.
The statistical data determined by the ISP processor 91 may be sent to the control logic 92 unit. For example, the statistical data may include image sensor 934 statistics such as auto-exposure, auto-white balance, auto-focus, flicker detection, black level compensation, lens 932 shading correction, and the like. The control logic 92 may include a processing element and/or microcontroller that executes one or more routines (e.g., firmware) that determine control parameters of the camera 93 and control parameters of the ISP processor 91 based on the received statistical data. For example, the control parameters of camera 93 may include sensor 94 control parameters (e.g., gain, integration time for exposure control, anti-shake parameters, etc.), camera flash control parameters, lens 932 control parameters (e.g., focal length for focusing or zooming), or a combination of these parameters. The ISP control parameters may include gain levels and color correction matrices for automatic white balance and color adjustment (e.g., during RGB processing), and lens 932 shading correction parameters.
For example, the following are steps of implementing the control method using the processor 60 in fig. 6 or using the image processing circuit 90 (specifically, the ISP processor 91) in fig. 7:
01: determining that the current shooting scene belongs to a night scene;
02: identifying a night scene mode applicable to the current shooting scene according to the shaking degree of the imaging equipment;
03: determining exposure parameters of each frame of image to be acquired according to the night scene mode;
04: and carrying out exposure control by adopting the exposure parameters.
In order to implement the above embodiments, the present invention also proposes a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the exposure control method as described in the foregoing method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (13)

1. An exposure control method, characterized by comprising the steps of:
determining that the current shooting scene belongs to a night scene;
according to the shake degree of the imaging device, identifying a night scene mode applicable to the current shooting scene, including: acquiring the shaking degree of the imaging equipment; if the jitter degree is greater than or equal to a first jitter threshold value, determining to adopt a single-frame night scene mode; if the jitter degree is smaller than the first jitter threshold and larger than a second jitter threshold, determining to adopt a handheld night scene mode; if the jitter degree is less than or equal to the second jitter threshold, determining to adopt a night view mode of the tripod;
the first shaking threshold value is larger than the second shaking threshold value, and the number of frames of the image to be acquired in the handheld night scene mode is larger than one frame;
determining exposure parameters of each frame of image to be acquired according to the night scene mode, wherein the exposure parameters comprise:
determining exposure compensation values preset by each frame of image to be acquired according to the night scene mode;
the preset exposure compensation value of each frame of image to be acquired is used for determining the exposure duration of each frame of image to be acquired; the value range of the exposure compensation value in the handheld night scene mode is smaller than the value range of the exposure compensation value in the tripod night scene mode;
determining whether the exposure time corresponding to each frame of image to be acquired is within a preset time range;
if the exposure time of at least one frame of image to be acquired is not in the preset time range, determining a multiplying power compensation value according to the corresponding exposure time and the preset time range, and updating the exposure time of at least one frame of image to be acquired according to the multiplying power compensation value so as to enable the exposure time of at least one frame of image to be acquired to be in the preset time range; and carrying out exposure control by adopting the exposure parameters.
2. The exposure control method according to claim 1, wherein the number of frames of the image to be captured in the pod night view mode is greater than the number of frames in the handheld night view mode.
3. The exposure control method according to claim 2, wherein the determining the exposure parameter of each frame of the image to be captured according to the night view mode comprises:
determining preset light sensitivity of each frame of image to be acquired according to the night scene mode;
the preset light sensitivity in the handheld night scene mode is greater than the preset light sensitivity in the foot stool night scene mode.
4. The exposure control method according to claim 3, wherein the determining exposure parameters of each frame of the image to be acquired according to the night view mode further comprises:
determining the reference exposure according to the brightness information of the preview image;
determining the target exposure of each frame of image to be acquired according to the reference exposure and the preset exposure compensation value of each frame of image to be acquired;
and determining the exposure time of each frame of image to be acquired according to the target exposure of each frame of image to be acquired and the preset light sensitivity of each frame of image to be acquired.
5. The exposure control method according to claim 2, wherein the acquiring of the degree of shake of the imaging apparatus includes:
acquiring collected displacement information from a sensor arranged on the imaging equipment;
and determining the shaking degree of the imaging equipment according to the displacement information.
6. The exposure control method according to claim 2, wherein the determining the exposure parameter of each frame of the image to be captured according to the night view mode comprises:
if the hand-held night scene mode is adopted, reading the corresponding relation between the jitter degree and the exposure parameter;
inquiring the corresponding relation according to the jitter degree of the imaging equipment to obtain the exposure parameters of each frame of image to be acquired; the exposure parameters comprise exposure duration, sensitivity and exposure compensation values.
7. The exposure control method according to claim 6,
the degree of dithering has a positive relationship with sensitivity in the exposure parameter;
the jitter degree has an inverse relation with the exposure duration in the exposure parameters;
the jitter degree has an inverse relationship with the value range of the exposure compensation value in the exposure parameter.
8. The exposure control method according to any one of claims 1 to 7, further comprising, after performing exposure control using the exposure parameter:
acquiring each frame of image acquired under the exposure control;
and synthesizing the frame images to obtain an imaging image.
9. The exposure control method according to any one of claims 1 to 7, wherein the determination that the current shooting scene belongs to a night scene includes:
extracting image features of the preview image;
inputting the extracted image characteristics into an identification model, and determining that the current shooting scene belongs to a night scene according to the scene type output by the identification model; wherein the recognition model has learned a correspondence between image features and scene types.
10. The exposure control method according to any one of claims 1 to 7, wherein the determination that the current shooting scene belongs to a night scene includes:
detecting a user operation for scene switching;
when user operation of switching to a night scene is detected, detecting the ambient brightness to obtain brightness information;
and determining that the current shooting scene belongs to a night scene according to the brightness information.
11. An exposure control apparatus, characterized in that the apparatus comprises:
the scene determining module is used for determining that the current shooting scene belongs to a night scene;
the identification module is used for identifying a night scene mode suitable for the current shooting scene according to the shaking degree of the imaging equipment, and comprises the following steps: acquiring the shaking degree of the imaging equipment; if the jitter degree is greater than or equal to a first jitter threshold value, determining to adopt a single-frame night scene mode; if the jitter degree is smaller than the first jitter threshold and larger than a second jitter threshold, determining to adopt a handheld night scene mode; if the jitter degree is less than or equal to the second jitter threshold, determining to adopt a night view mode of the tripod;
the first shaking threshold value is larger than the second shaking threshold value, and the number of frames of the image to be acquired in the handheld night scene mode is larger than one frame;
the parameter determining module is used for determining exposure parameters of the images to be acquired of each frame according to the night scene mode, and comprises the following steps: determining exposure compensation values preset by each frame of image to be acquired according to the night scene mode; the preset exposure compensation value of each frame of image to be acquired is used for determining the exposure duration of each frame of image to be acquired; the value range of the exposure compensation value in the handheld night scene mode is smaller than the value range of the exposure compensation value in the tripod night scene mode; determining whether the exposure time corresponding to each frame of image to be acquired is within a preset time range; if the exposure time of at least one frame of image to be acquired is not in the preset time range, determining a multiplying power compensation value according to the corresponding exposure time and the preset time range, and updating the exposure time of at least one frame of image to be acquired according to the multiplying power compensation value so as to enable the exposure time of at least one frame of image to be acquired to be in the preset time range; and the control module is used for carrying out exposure control by adopting the exposure parameters.
12. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the exposure control method according to any one of claims 1 to 10.
13. A computer-readable storage medium on which a computer program is stored, the program, when being executed by a processor, implementing the exposure control method according to any one of claims 1 to 10.
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