CN102495511A - Automatic exposure regulating method for camera - Google Patents
Automatic exposure regulating method for camera Download PDFInfo
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- CN102495511A CN102495511A CN201110407106XA CN201110407106A CN102495511A CN 102495511 A CN102495511 A CN 102495511A CN 201110407106X A CN201110407106X A CN 201110407106XA CN 201110407106 A CN201110407106 A CN 201110407106A CN 102495511 A CN102495511 A CN 102495511A
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Abstract
The invention discloses an automatic exposure regulating method for a camera. The method comprises the following steps of: counting raw data of a frame of shot image, and calculating the quantity of unsaturated blocks in the raw data and the unsaturation rate of the raw data; and by using the unsaturation rate, judging whether the exposure of the camera is required, and performing exposure regulation on the camera. By adoption of the method, an automatic exposure function of a high-definition camera can be well realized, a scene can be intelligently and automatically determined and identified, exposure time can be automatically regulated, and a good image can be shot. By checking and determining an actual scene in real time, the exposure time and gain are regulated, day operation and night operation can be accurately distinguished, and a flashlight which is used at night or a continuous light can be controlled, so that the camera adopting the method can be applied to various kinds of light rays and scenes. The method has the advantages that: the application range of the high-definition camera is greatly expanded; and a real-time scene image can be well shot.
Description
Technical field
The present invention relates to traffic video camera exposure technique apparatus field, especially a kind of video camera automatic exposure regulating method.
Background technology
The camera exposure time is meant from shutter and is opened to the time interval of closing, and during this period of time, the luminous flux that long words of time shutter get into is just many more, is fit to the poor situation of light condition; Otherwise it is just few more to get into luminous flux, is fit to the reasonable situation of light; Therefore under extraneous different light rays environment, just need to select the different time shutter to obtain the appropriate brightness photo.Gain is the enlargement factor of camera signal, is worth greatly more, and brightness of image is high more, otherwise image is dark more.The automatic exposure algorithm of camera is exactly through regulating the time shutter and the gain of camera, obtaining being fit to the image of brightness.Shortcoming and defect below the technology of high-definition camera automatic exposure at present exists:
1, phase machine testing scene light line strength is not accurate enough, can't regulate the automatic exposure time exactly.
2, auto exposure system can't normally move under the more intense or more weak situation of light.
3, under the condition that occurs strong backlight aspect the intelligent transportation, can't obtain correct scene image.
The main cause that above shortcoming and defect appears in above-mentioned magazine automatic exposure technology is that the automatic exposure algorithm of indoor design improves inadequately or there is defective in internal circuit design, can not make camera under the shooting environmental of complicacy, shoot correct scene image.For the photo that camera is taken more approaches real scenery, designed high-definition camera automatic exposure algorithm under complicated situation.
Summary of the invention
In order to remedy the shortcoming and defect that above-mentioned automatic exposure technology occurs, the present invention proposes a kind of video camera automatic exposure regulating method.This method comprises following step:
The original RAW data of (1) gathering a two field picture by the CMOS or the ccd image sensor of video camera;
(2) the RAW data with the high H pixel that collects in the step (1), wide L pixel are divided into n high H
1Pixel, wide L
1The data fritter of pixel, n>2;
(3) 2X2 pixel chosen in certain position in the data fritter that step (2) marks off, and adds up degree of unsaturation value G1, G2, G3, the G4 of these four pixels respectively;
(4) compare with the degree of unsaturation value G1 of sample in the step (3), G2, G3, G4 and with reference to threshold k; If G1, G2, G3, G4 are less than the K value; Then defining the data fritter of being taken a sample in the step (3) is unsaturated, otherwise the data fritter of sampling is non-unsaturated in the definition step (3);
(5) to remaining data fritter repeating step (3) and step (4) in the RAW data, and unsaturated of will obtain add up, and counts unsaturated total number C in the RAW data;
(6) the unsaturated fast total number and all the data fritter number n that obtain in the step (5) are compared, calculate percent unsaturation R, its computation rule is R=2C/n.In this step,, be 0-2. so obtain the span of R because the scope of C is 0-n
(7) percent unsaturation R that obtains and reference data value R0 are compared, obtain the deviation △ R of the unsaturated rate and the reference value of current image frame, its rule is: △ R=R-R0, wherein the span of R0 is 1.1-1.6.The span that in this step, obtains △ R is-1.6-0.9.
The size of the △ R value that (8) compares according to step (7), camera is regulated the light sensitivity of screening-mode, time shutter and imageing sensor automatically, and will regulate the result and set into camera, for next frame calculates ready.
In above-mentioned steps, the sample position of remainder data fritter is consistent with the sample position of step (3) data fritter in the step (5).Adopt the sampling mode of present technique scheme, the RAW data sampling is the most even, can react the situation of integrated data block.
At △ R is not 0 o'clock, and camera is according to the absolute value of △ R
∣△ R
∣Size the adjusting step-length of time shutter and imageing sensor light sensitivity is set, then according to △ R select screening-mode and to the time shutter with the increase of imageing sensor light sensitivity or reduce corresponding step-length, make it reach photographing request, wherein,
When 0＜
∣△ R
∣≤0.2 o'clock, it was 0 (ns of unit) that time shutter adjusting step-length is set, and it is 0 that imageing sensor light sensitivity adjusting step-length is set;
When 0.2＜
∣△ R
∣≤0.4 o'clock, it was 1 that time shutter adjusting step-length is set, and it is 1 that imageing sensor light sensitivity adjusting step-length is set;
When 0.4＜
∣△ R
∣≤0.5 o'clock, it was 3 that time shutter adjusting step-length is set, and it is 1 that imageing sensor light sensitivity adjusting step-length is set;
When 0.5＜
∣△ R
∣≤0.7 o'clock, it was 4 that time shutter adjusting step-length is set, and the imageing sensor light sensitivity is set regulates step-length 2;
When 0.7＜
∣△ R
∣The time, it is 5 that time shutter adjusting step-length is set, it is 3 that imageing sensor light sensitivity adjusting step-length is set.
After setting the adjusting step-length of camera, according to △ R size, camera has three kinds of regulative modes, one of which, △ R＞0 o'clock: camera according to
∣△ R
∣The scope of value increases the time shutter of corresponding step-length, if the time shutter has been the camera upper limit, then increases the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity also has been the camera upper limit, then camera is opened flashlamp and got into Night; Its two, when △ R＜0 and time shutter and imageing sensor light sensitivity are on the camera in limited time, camera acquiescence this moment be a Night, camera will be turned off flashlamp entering day mode; Its three, when △ R＜0 and time shutter and imageing sensor light sensitivity have one on the camera in limited time, camera according to
∣△ R
∣The scope of value reduces the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity has been the camera lower limit, then camera reduces the time shutter of corresponding step-length, if the time shutter has also reached the camera lower limit, then camera is not regulated.
The present invention can realize the high-definition camera automatic exposure function preferably, and can intelligence scene is judged automatically and is discerned, regulate the time shutter automatically, shoot reasonable image.Because this invention is through carrying out real-time inspection and judging and regulate time shutter and gain to actual scene; And can correctly distinguish daytime and night two kinds of situation; And, therefore adopt the camera of this method can adapt to various light and scene in flashlamp or the normal bright lamp control that add night.The present invention has promoted the usable range of high-definition camera greatly, and can shoot the real-time scene image preferably.
Description of drawings
Fig. 1 is a video camera automatic exposure regulating method embodiment schematic flow sheet according to the invention;
Schematic flow sheet when Fig. 2 carries out camera automatic exposure adjusting for the method for the invention.
Embodiment
With reference to the accompanying drawings the present invention is further specified.
With reference to Fig. 1, one embodiment of the present invention.In this embodiment, the video camera automatic exposure regulating method comprises following step:
The original RAW data of (1) gathering a two field picture by the CMOS or the ccd image sensor of video camera;
(2) the RAW data with the high H pixel that collects in the step (1), wide L pixel are divided into n high H
1Pixel, wide L
1Data fritter (the H of pixel
1>2, L
1>2);
(3) 2X2 pixel chosen in certain position in the data fritter that step (2) marks off, and adds up degree of unsaturation value G1, G2, G3, the G4 of these four pixels respectively;
(4) compare with the degree of unsaturation value G1 of sample in the step (3), G2, G3, G4 and with reference to threshold k; If G1, G2, G3, G4 are less than the K value; Then defining the data fritter of being taken a sample in the step (3) is unsaturated, otherwise the data fritter of sampling is non-unsaturated in the definition step (3);
(5) to remaining data fritter repeating step (3) and step (4) in the RAW data, and unsaturated of will obtain add up, and counts unsaturated total number C in the RAW data;
(6) the unsaturated fast total number and all the data fritter number n that obtain in the step (5) are compared, calculate percent unsaturation R, its computation rule is R=C ÷ n/2;
(7) percent unsaturation R that obtains and reference data value R0 are compared, obtain the deviation △ R of the unsaturated rate and the reference value of current image frame, its rule is: △ R=R-R0, and wherein the span of R0 is 1.1-1.6;
The size of the △ R value that (8) compares according to step (7), camera is regulated the light sensitivity of screening-mode, time shutter and imageing sensor automatically, and will regulate the result and set into camera, for next frame calculates ready.
The sample position of remainder data fritter is consistent with the sample position of step (3) data fritter in the step described in the said method (5).
With reference to Fig. 2, a kind of regulative mode of camera is not 0 o'clock at △ R in the step of Fig. 1 method (8), and camera is according to the absolute value of △ R
∣△ R
∣Size the adjusting step-length to time shutter and imageing sensor light sensitivity is set, then according to △ R select screening-mode and to the time shutter with the increase of imageing sensor light sensitivity or reduce corresponding step-length, make it reach photographing request, wherein,
When 0＜
∣△ R
∣≤0.2 o'clock, it was 0 (ns of unit) that time shutter adjusting step-length is set, and it is 0 that imageing sensor light sensitivity adjusting step-length is set;
When 0.2＜
∣△ R
∣≤0.4 o'clock, it was 1 that time shutter adjusting step-length is set, and it is 1 that imageing sensor light sensitivity adjusting step-length is set;
When 0.4＜
∣△ R
∣≤0.5 o'clock, the time shutter is set, and to regulate step-length be 3, the imageing sensor light sensitivity is set regulates step-length for being 1;
When 0.5＜
∣△ R
∣≤0.7 o'clock, it was 4 that time shutter adjusting step-length is set, and it is 2 that imageing sensor light sensitivity adjusting step-length is set;
When 0.7＜
∣△ R
∣The time, it is 5 that time shutter adjusting step-length is set, it is 3 that imageing sensor light sensitivity adjusting step-length is set.
After confirming the adjusting step-length of camera, according to △ R size camera three kinds of regulative modes are arranged, one of which, in △ R＞0 o'clock, camera according to
∣△ R
∣The scope of value increases the time shutter of corresponding step-length, if the time shutter has been the camera upper limit, then increases the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity has been the camera upper limit also, then camera is opened flashlamp, gets into Night; Its two, when △ R＜0 and time shutter and imageing sensor light sensitivity are on the camera in limited time, camera acquiescence this moment be a Night, camera will be turned off flashlamp entering day mode; Its three, when △ R＜0 and time shutter and imageing sensor light sensitivity have one on the camera in limited time, camera according to
∣△ R
∣The scope of value reduces the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity has been the camera lower limit, then camera reduces the time shutter of corresponding step-length, if the time shutter has also reached the camera lower limit, then camera is not regulated.
After the adjusting that camera made public according to this frame RAW data, camera is preserved the parameter that regulates and is carried out the next frame shooting, simultaneously next frame is repeated the computing and the adjusting of above method, till camera meets the requirements.
Technique scheme has only embodied the optimal technical scheme of technical scheme of the present invention, the technician in present technique field to some part wherein some changes that possibly make all embodied principle of the present invention, belong within protection scope of the present invention.
Claims (4)
1. a video camera automatic exposure regulating method is characterized in that, this method may further comprise the steps:
(1) CMOS of video camera or ccd image sensor are gathered the original RAW data of a two field picture;
(2) the RAW data with the high H pixel that collects in the step (1), wide L pixel are divided into n high H
1Pixel, wide L
1The data fritter of pixel, n>2;
(3) 2X2 pixel chosen in certain position in the data fritter that step (2) marks off, and adds up degree of unsaturation value G1, G2, G3, the G4 of these four pixels respectively;
(4) degree of unsaturation value G1, G2, G3, the G4 with sample in the step (3) compares with reference to fixed threshold parameter K; If G1, G2, G3, G4 are less than the K value; Then defining the data fritter of being taken a sample in the step (3) is unsaturated, otherwise the data fritter of sampling is non-unsaturated in the definition step (3);
(5) to remaining data fritter repeating step (3) and step (4) in the RAW data, and the unsaturated number that will obtain add up, and counts unsaturated total number C in the RAW data;
(6) the unsaturated total number and all the data fritter number n that obtain in the step (5) are compared, calculate percent unsaturation R, its computation rule is R=2C/n;
(7) the reference data value R0 with percent unsaturation R that obtains and setting compares, and obtains the deviation △ R of unsaturated rate with the reference value of current image frame, and its computation rule is: △ R=R-R0, and wherein the R0 span of setting is 1.1-1.6;
The size of the △ R value that (8) compares according to step (7), camera is regulated the light sensitivity of screening-mode, time shutter and imageing sensor automatically, and will regulate the result and set into camera, for next frame calculates ready.
2. video camera automatic exposure regulating method according to claim 1 is characterized in that, said step (5) is chosen the sample position of 2X2 pixel in the remainder data fritter consistent with the sample position of step (3).
3. video camera automatic exposure regulating method according to claim 1 is characterized in that, in the step (8), is not 0 o'clock at △ R, and camera is according to the absolute value of △ R
∣△ R
∣Size the adjusting step-length of time shutter and imageing sensor light sensitivity is set, select screening-mode according to △ R then and time shutter and imageing sensor light sensitivity increased or reduce corresponding step-length, make it reach photographing request, regulate judge regular as follows,
When 0＜
∣△ R
∣≤0.2 o'clock, it was 0 that time shutter adjusting step-length is set, and it is 0 that imageing sensor light sensitivity adjusting step-length is set;
When 0.2＜
∣△ R
∣≤0.4 o'clock, it was 1 that time shutter adjusting step-length is set, and it is 1 that imageing sensor light sensitivity adjusting step-length is set;
When 0.4＜
∣△ R
∣≤0.5 o'clock, it was 3 that time shutter adjusting step-length is set, and it is 1 that imageing sensor light sensitivity adjusting step-length is set;
When 0.5＜
∣△ R
∣≤0.7 o'clock, it was 4 that time shutter adjusting step-length is set, and it is 2 that imageing sensor light sensitivity adjusting step-length is set;
When 0.7＜
∣△ R
∣The time, it is 5 that time shutter adjusting step-length is set, it is 3 that imageing sensor light sensitivity adjusting step-length is set;
The above-mentioned time shutter is regulated step-length unit and is ns.
4. video camera automatic exposure regulating method according to claim 3 is characterized in that, according to the big or small camera of △ R three kinds of regulative modes is arranged, one of which, in △ R＞0 o'clock, camera according to
∣△ R
∣The scope of value increases the time shutter of corresponding step-length, if the time shutter has been the camera upper limit, then increases the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity has been the camera upper limit also, then camera is opened flashlamp, gets into Night; Its two, when △ R＜0 and time shutter and imageing sensor light sensitivity are on the camera in limited time, camera acquiescence this moment be a Night, camera will be turned off flashlamp entering day mode; Its three, when △ R＜0 and time shutter and imageing sensor light sensitivity have one on the camera in limited time, camera according to
∣△ R
∣The scope of value reduces the imageing sensor light sensitivity of corresponding step-length, if the imageing sensor light sensitivity has been the camera lower limit, then camera reduces the time shutter of corresponding step-length, if the time shutter has also reached the camera lower limit, then camera is not regulated.
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|---|---|---|---|
| CN201110407106XA CN102495511B (en) | 2011-12-09 | 2011-12-09 | Automatic exposure regulating method for camera |
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| CN102495511B CN102495511B (en) | 2013-11-20 |
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| CN107734256A (en) * | 2017-10-24 | 2018-02-23 | 无锡瑞辰光谱测控有限公司 | A kind of formula dimmer arrangement with an automatic light meter and its application method |
| CN105430242B (en) * | 2014-09-12 | 2018-11-09 | 佳能株式会社 | Photographic device and its control method |
| CN109714523A (en) * | 2017-10-25 | 2019-05-03 | 佳能株式会社 | Picture pick-up device, luminaire and its control method and storage medium |
| US10713767B2 (en) | 2017-07-10 | 2020-07-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Regulation method, terminal equipment and non-transitory computer-readable storage medium for automatic exposure control of region of interest |
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| CN103051837A (en) * | 2012-12-17 | 2013-04-17 | 广东欧珀移动通信有限公司 | Method and device for improving effect of camera shooting in dark |
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| CN105049744A (en) * | 2015-09-10 | 2015-11-11 | 北京奇虎科技有限公司 | Intelligent image pick-up device and recording control method thereof |
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| CN105187728A (en) * | 2015-10-08 | 2015-12-23 | 广东欧珀移动通信有限公司 | Shooting method and device |
| US10713767B2 (en) | 2017-07-10 | 2020-07-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Regulation method, terminal equipment and non-transitory computer-readable storage medium for automatic exposure control of region of interest |
| CN107734256A (en) * | 2017-10-24 | 2018-02-23 | 无锡瑞辰光谱测控有限公司 | A kind of formula dimmer arrangement with an automatic light meter and its application method |
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| CN109714523A (en) * | 2017-10-25 | 2019-05-03 | 佳能株式会社 | Picture pick-up device, luminaire and its control method and storage medium |
| CN109714523B (en) * | 2017-10-25 | 2021-06-01 | 佳能株式会社 | Image pickup apparatus, light emitting apparatus, control method thereof, and storage medium |
| CN111586312A (en) * | 2020-05-14 | 2020-08-25 | Oppo（重庆）智能科技有限公司 | Automatic exposure control method and device, terminal and storage medium |
| CN111586312B (en) * | 2020-05-14 | 2022-03-04 | Oppo（重庆）智能科技有限公司 | Automatic exposure control method and device, terminal and storage medium |
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