CN108989689A - A kind of method and apparatus of adjust automatically exposure gain - Google Patents
A kind of method and apparatus of adjust automatically exposure gain Download PDFInfo
- Publication number
- CN108989689A CN108989689A CN201811083457.8A CN201811083457A CN108989689A CN 108989689 A CN108989689 A CN 108989689A CN 201811083457 A CN201811083457 A CN 201811083457A CN 108989689 A CN108989689 A CN 108989689A
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- Prior art keywords
- exposure gain
- brightness
- preset
- average brightness
- gain
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Classifications
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
-
- 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
- H04N23/61—Control of cameras or camera modules based on recognised objects
- H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
-
- 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
- H04N23/62—Control of parameters via user interfaces
Abstract
The method and apparatus that the present invention discloses a kind of adjust automatically exposure gain, comprising: obtain shooting preview picture；Calculate the average brightness of presumptive area in shooting preview picture；If the average brightness is greater than the maximum value of preset brightness section, judge whether current exposure gain is scheduled minimum exposure gain；If current exposure gain is greater than scheduled minimum exposure gain, current exposure gain is gradually reduced according to preset step-length, until the average brightness is located in preset brightness section；If the average brightness is less than the minimum value of preset brightness section, judge whether current exposure gain is scheduled maximum exposure gain；If current exposure gain is less than scheduled maximum exposure gain, current exposure gain is incrementally increased according to preset step-length, until the average brightness is located in preset brightness section.Technical solution provided by the invention, can be under the preview interface of filming apparatus, the brightness of adjust automatically preview screen, to promote shooting quality.
Description
Technical field
The present invention relates to automatic control technology field more particularly to a kind of method and apparatus of adjust automatically exposure gain.
Background technique
With the development of technology, pixel provided by filming apparatus (camera and/or video camera) is higher and higher, especially
The photographic device integrated in mobile terminal greatly meets the demand that user takes pictures whenever and wherever possible.However, existing shooting
Device needs manually to adjust exposure gain under complicated light environment to control its basic exposure value, that is, needs by user's root
According to the experience of taking pictures of oneself, exposure gain parameter value is manually increased or decreased, to adjust the bright of shooting picture in previews
Degree.Obviously, this manually adjustment mode needs to rely on the experience of photographer, cumbersome, it usually needs to take a long time
Customer satisfaction system Preview results can be just adjusted to.
Summary of the invention
The present invention is intended to provide a kind of method and apparatus of adjust automatically exposure gain, it can be in preview circle of filming apparatus
Under face, the brightness of adjust automatically preview screen, to promote shooting quality.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of method of adjust automatically exposure gain, comprising: obtain shooting preview picture；Calculate the shooting preview picture
The average brightness of middle presumptive area；If the average brightness is greater than the maximum value of preset brightness section, judge that current exposure increases
Whether benefit is scheduled minimum exposure gain；If current exposure gain is greater than the scheduled minimum exposure gain, according to default
Step-length gradually reduce current exposure gain, until the average brightness is located in the preset brightness section；If described flat
Equal brightness is less than the minimum value of preset brightness section, judges whether current exposure gain is scheduled maximum exposure gain；If
Current exposure gain is less than the scheduled maximum exposure gain, incrementally increases current exposure gain according to preset step-length, directly
It is located in the preset brightness section to the average brightness.
Preferably, the presumptive area is the shooting preview picture.
Preferably, the presumptive area is the human face region in the shooting preview picture.
Preferably, the average brightness for calculating presumptive area in the shooting preview picture includes: pre- from the shooting
It lookes in picture and detects human face region；Calculate the average RGB value of the human face region；By the average RGB value of the human face region
Multiplied by scheduled luminance weights, the average brightness of the human face region is obtained.
Preferably, the brightness section is preset according to different photographed scenes.
A kind of device of adjust automatically exposure gain, comprising: acquiring unit, for obtaining shooting preview picture；It calculates single
Member, for calculating the average brightness of presumptive area in the shooting preview picture；First judging unit, it is described average for judging
Whether brightness is greater than the maximum value of preset brightness section；Second judgment unit, for when the average brightness is greater than preset
When the maximum value of brightness section, judge whether current exposure gain is scheduled minimum exposure gain；Exposure gain adjustment unit,
For gradually reducing current exposure according to preset step-length when current exposure gain is greater than the scheduled minimum exposure gain
Gain, until the average brightness is located in the preset brightness section；Third judging unit, it is described average bright for judging
Whether degree is less than the minimum value of preset brightness section；4th judging unit, for when the average brightness is less than preset bright
When spending the minimum value in section, judge whether current exposure gain is scheduled maximum exposure gain；The exposure gain adjustment is single
Member is also used to incrementally increase currently when current exposure gain is less than the scheduled maximum exposure gain according to preset step-length
Exposure gain, until the average brightness is located in the preset brightness section.
Preferably, the computing unit includes: Face datection unit, for detecting people from the shooting preview picture
Face region；First computation subunit, for calculating the average RGB value of the human face region；Second computation subunit is used for institute
The average RGB value of human face region is stated multiplied by scheduled luminance weights, obtains the average brightness of the human face region.
The method and apparatus of adjust automatically exposure gain provided in an embodiment of the present invention, after obtaining shooting preview picture,
The automatic average brightness for calculating shooting preview picture, when the average brightness exceeds preset brightness section, according to preset step
Length gradually reduces or increases current exposure gain, until the average brightness of shooting preview picture is adjusted to preset brightness section
Interior, the shooting preview picture of more high brightness can be automatically obtained by making user in low light conditions, can be automatic under the conditions of bloom
The shooting preview picture for obtaining more low-light level, i.e., make preview screen all-the-time stable preset bright by automatically increasing or decreasing exposure gain
Spend in section, and user no longer needed to be manually adjusted according to the shooting experience of itself, be also unlikely to the photo for making to shoot/
Image is excessively dark or excessively bright.As it can be seen that technical solution provided by the invention, can greatly promote user and shoot experience, while energy
Enough obtain better shooting quality.
Detailed description of the invention
Fig. 1 is the method flow diagram of the embodiment of the present invention one；
Fig. 2 is the method flow diagram of the embodiment of the present invention two；
Fig. 3 is the system construction drawing of the embodiment of the present invention one；
Fig. 4 is the system construction drawing of the embodiment of the present invention two.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing, to the present invention into
Row is further described.
Fig. 1 is the method flow diagram of the embodiment of the present invention one, comprising the following steps:
Step 1: obtaining shooting preview picture, i.e., obtains video requency frame data from camera；Calculate above-mentioned video requency frame data
The average brightness of overall picture.
Step 2: it if the average brightness of above-mentioned overall picture is greater than the maximum value of preset brightness section, gos to step
Three；If the average brightness of above-mentioned overall picture is less than the minimum value of preset brightness section, four are gone to step；If above-mentioned entirety
The average brightness of picture is in preset brightness section, then does not need adjustment exposure gain, and process terminates.
Step 3 judges whether the current exposure gain of camera is scheduled minimum exposure gain, the scheduled minimum exposure
The gain of light is the system value minExposureTargetBias of Current camera, if current exposure gain has had exceeded
MinExposureTargetBias can not then be further continued for reducing exposure gain, and process terminates；If current exposure gain is greater than
MinExposureTargetBias executes step 5；
Step 4 judges whether the current exposure gain of camera is scheduled maximum exposure gain, this is scheduled most to make public
The gain of light is the system value maxExposureTargetBias of Current camera, if current exposure gain has had exceeded
MaxExposureTargetBias can not then be further continued for increasing exposure gain, and process terminates；If current exposure gain is less than
MaxExposureTargetBias executes step 6；
Step 5 gradually reduces on the basis of current exposure gain exposureTargetBias according to preset step-length
Then exposure gain calls until the average brightness of overall picture is located in above-mentioned preset brightness section
SetExposureTargetBias:completionHandler: the new exposure gain value camera is arranged.Wherein,
SetExposureTargetBias:completionHandler: being the side for the adjustment camera exposure gain that camera system provides
Method；
Step 6 incrementally increases on the basis of current exposure gain exposureTargetBias according to preset step-length
Then exposure gain calls until the average brightness of overall picture is located in above-mentioned preset brightness section
SetExposureTargetBias:completionHandler: the new exposure gain value camera is arranged.
Fig. 2 is the method flow diagram of the embodiment of the present invention two, and embodiment two combines face recognition technology, by detecting video
The brightness of human face region in frame data, adjust automatically camera exposure gain are automatic when the brightness of human face region reaches ideal value
It takes pictures.Embodiment two the following steps are included:
Step 1 obtains shooting preview picture, i.e., obtains video requency frame data from camera.
Step 2 detects human face region from the shooting preview picture, and calculates the average brightness of human face region.Tool
The method that body calculates human face region average brightness includes: to calculate the average RGB value of the human face region；By the human face region
Average RGB value obtains the average brightness of the human face region multiplied by scheduled luminance weights.
Step 3 gos to step if the average brightness of above-mentioned human face region is greater than the maximum value of preset brightness section
Four；If the average brightness of above-mentioned human face region is less than the minimum value of preset brightness section, five are gone to step；If above-mentioned face
The average brightness in region is in preset brightness section, then does not need adjustment exposure gain, directly take pictures, process terminates.
Step 4 judges whether the current exposure gain of camera is scheduled minimum exposure gain, the scheduled minimum exposure
The gain of light is the system value minExposureTargetBias of Current camera, if current exposure gain has had exceeded
MinExposureTargetBias can not then be further continued for reducing exposure gain, and process terminates；If current exposure gain is greater than
MinExposureTargetBias executes step 6；
Step 5 judges whether the current exposure gain of camera is scheduled maximum exposure gain, this is scheduled most to make public
The gain of light is the system value maxExposureTargetBias of Current camera, if current exposure gain has had exceeded
MaxExposureTargetBias can not then be further continued for increasing exposure gain, and process terminates；If current exposure gain is less than
MaxExposureTargetBias executes step 7；
Step 6 gradually reduces on the basis of current exposure gain exposureTargetBias according to preset step-length
Then exposure gain calls until the average brightness of human face region is located in above-mentioned preset brightness section
SetExposureTargetBias:completionHandler: the new exposure gain value camera is arranged.Wherein,
SetExposureTargetBias:completionHandler: being the side for the adjustment camera exposure gain that camera system provides
Method；
Step 7 incrementally increases on the basis of current exposure gain exposureTargetBias according to preset step-length
Then exposure gain calls until the average brightness of human face region is located in above-mentioned preset brightness section
SetExposureTargetBias:completionHandler: the new exposure gain value camera is arranged.
Fig. 3 is the system construction drawing of the embodiment of the present invention one, comprising: acquiring unit, for obtaining shooting preview picture；Meter
Unit is calculated, for calculating the average brightness of presumptive area in the shooting preview picture；First judging unit, it is described for judging
Whether average brightness is greater than the maximum value of preset brightness section；Second judgment unit, for being greater than in advance when the average brightness
If brightness section maximum value when, judge whether current exposure gain is scheduled minimum exposure gain；Exposure gain adjustment
Unit, for gradually reducing and working as according to preset step-length when current exposure gain is greater than the scheduled minimum exposure gain
Prior exposure gain, until the average brightness is located in the preset brightness section；Third judging unit, it is described for judging
Whether average brightness is less than the minimum value of preset brightness section；4th judging unit, for being less than in advance when the average brightness
If brightness section minimum value when, judge whether current exposure gain is scheduled maximum exposure gain；The exposure gain
Adjustment unit is also used to gradually increase when current exposure gain is less than the scheduled maximum exposure gain according to preset step-length
Big current exposure gain, until the average brightness is located in the preset brightness section.
Fig. 4 be the embodiment of the present invention two system construction drawing, with embodiment one the difference is that, the computing unit
It include: Face datection unit, for detecting human face region from the shooting preview picture；First computation subunit, is used for
Calculate the average RGB value of the human face region；Second computation subunit, for by the average RGB value of the human face region multiplied by
Scheduled luminance weights obtain the average brightness of the human face region.
Embodiment two joined human face detection tech on the basis of example 1, can be detected based on face information pre-
The average brightness of picture data frame is look at, so that a pervasive scheme is upgraded to the professional detection scheme for portrait self-timer.
Using technical solution provided by the invention, can effectively, intelligently adjust under complex illumination environment acquired
The brightness of shooting preview picture, whether self-timer either shoots landscape, and this programme can control shooting preview picture
In one ideal brightness section, and user is no longer needed to be manually adjusted according to the shooting experience of itself, reduces complexity
Manual adjusting operation while improving shooting quality to improve the shooting experience of user.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.
Claims (7)
1. a kind of method of adjust automatically exposure gain characterized by comprising
Obtain shooting preview picture；
Calculate the average brightness of presumptive area in the shooting preview picture；
If the average brightness is greater than the maximum value of preset brightness section, judge whether current exposure gain is scheduled minimum
Exposure gain；
If current exposure gain is greater than the scheduled minimum exposure gain, current exposure is gradually reduced according to preset step-length and is increased
Benefit, until the average brightness is located in the preset brightness section；
If the average brightness is less than the minimum value of preset brightness section, judge whether current exposure gain is scheduled maximum
Exposure gain；
If current exposure gain is less than the scheduled maximum exposure gain, current exposure is incrementally increased according to preset step-length and is increased
Benefit, until the average brightness is located in the preset brightness section.
2. the method for adjust automatically exposure gain according to claim 1, which is characterized in that the presumptive area is described
Shooting preview picture.
3. the method for adjust automatically exposure gain according to claim 1, which is characterized in that the presumptive area is described
Human face region in shooting preview picture.
4. the method for adjust automatically exposure gain according to claim 3, which is characterized in that described to calculate the shooting in advance
The average brightness of presumptive area in picture of looking at includes:
Human face region is detected from the shooting preview picture；
Calculate the average RGB value of the human face region；
By the average RGB value of the human face region multiplied by scheduled luminance weights, the average brightness of the human face region is obtained.
5. the method for adjust automatically exposure gain according to claim 1, which is characterized in that the brightness section is not according to
Same photographed scene is preset.
6. a kind of device of adjust automatically exposure gain characterized by comprising
Acquiring unit, for obtaining shooting preview picture；
Computing unit, for calculating the average brightness of presumptive area in the shooting preview picture；
First judging unit, for judging whether the average brightness is greater than the maximum value of preset brightness section；
Second judgment unit judges current exposure when for being greater than the maximum value of preset brightness section when the average brightness
Whether gain is scheduled minimum exposure gain；
Exposure gain adjustment unit is used for when current exposure gain is greater than the scheduled minimum exposure gain, according to default
Step-length gradually reduce current exposure gain, until the average brightness is located in the preset brightness section；
Third judging unit, for judging whether the average brightness is less than the minimum value of preset brightness section；
4th judging unit judges current exposure when for being less than the minimum value of preset brightness section when the average brightness
Whether gain is scheduled maximum exposure gain；
The exposure gain adjustment unit is also used to when current exposure gain is less than the scheduled maximum exposure gain, according to
Preset step-length incrementally increases current exposure gain, until the average brightness is located in the preset brightness section.
7. the device of adjust automatically exposure gain according to claim 6, which is characterized in that the computing unit includes:
Face datection unit, for detecting human face region from the shooting preview picture；
First computation subunit, for calculating the average RGB value of the human face region；
Second computation subunit, for the average RGB value of the human face region multiplied by scheduled luminance weights, to be obtained the people
The average brightness in face region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811083457.8A CN108989689A (en) | 2018-09-17 | 2018-09-17 | A kind of method and apparatus of adjust automatically exposure gain |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811083457.8A CN108989689A (en) | 2018-09-17 | 2018-09-17 | A kind of method and apparatus of adjust automatically exposure gain |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714543A (en) * | 2019-01-10 | 2019-05-03 | 成都品果科技有限公司 | A method of it obtaining skin brightness in camera data stream and adjusts exposure |
| CN110072050A (en) * | 2019-03-28 | 2019-07-30 | 苏州科达科技股份有限公司 | Self-adapting regulation method, device and a kind of capture apparatus of exposure parameter |
| CN111358424A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Fundus imaging brightness adjusting method and fundus camera |
| CN113329188A (en) * | 2021-05-07 | 2021-08-31 | 浙江大华技术股份有限公司 | Exposure control method and device, electronic equipment and storage medium |
| CN113556478A (en) * | 2020-04-23 | 2021-10-26 | 苏州佳世达光电有限公司 | Mouth scanning machine and camera gain adjusting method thereof |
| CN113992863A (en) * | 2021-12-28 | 2022-01-28 | 北京的卢深视科技有限公司 | Automatic exposure method, device, electronic equipment and computer readable storage medium |
| WO2022042567A1 (en) * | 2020-08-24 | 2022-03-03 | 青岛小鸟看看科技有限公司 | Method, apparatus, and device for determining exposure parameter of head-mounted device |
| CN114374801A (en) * | 2021-12-28 | 2022-04-19 | 苏州凌云视界智能设备有限责任公司 | Method, device and equipment for determining exposure time and storage medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714543A (en) * | 2019-01-10 | 2019-05-03 | 成都品果科技有限公司 | A method of it obtaining skin brightness in camera data stream and adjusts exposure |
| CN110072050A (en) * | 2019-03-28 | 2019-07-30 | 苏州科达科技股份有限公司 | Self-adapting regulation method, device and a kind of capture apparatus of exposure parameter |
| CN111358424A (en) * | 2020-03-17 | 2020-07-03 | 苏州微清医疗器械有限公司 | Fundus imaging brightness adjusting method and fundus camera |
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| CN113556478A (en) * | 2020-04-23 | 2021-10-26 | 苏州佳世达光电有限公司 | Mouth scanning machine and camera gain adjusting method thereof |
| WO2022042567A1 (en) * | 2020-08-24 | 2022-03-03 | 青岛小鸟看看科技有限公司 | Method, apparatus, and device for determining exposure parameter of head-mounted device |
| CN113329188A (en) * | 2021-05-07 | 2021-08-31 | 浙江大华技术股份有限公司 | Exposure control method and device, electronic equipment and storage medium |
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| CN113992863A (en) * | 2021-12-28 | 2022-01-28 | 北京的卢深视科技有限公司 | Automatic exposure method, device, electronic equipment and computer readable storage medium |
| CN114374801A (en) * | 2021-12-28 | 2022-04-19 | 苏州凌云视界智能设备有限责任公司 | Method, device and equipment for determining exposure time and storage medium |
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