CN102572206A - Color correction method - Google Patents
Color correction method Download PDFInfo
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- CN102572206A CN102572206A CN2010106168629A CN201010616862A CN102572206A CN 102572206 A CN102572206 A CN 102572206A CN 2010106168629 A CN2010106168629 A CN 2010106168629A CN 201010616862 A CN201010616862 A CN 201010616862A CN 102572206 A CN102572206 A CN 102572206A
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Abstract
The invention discloses a color correction method, which comprises the following steps of: S1, obtaining the red component value, the green component value, the blue component value, the red gain value and the blue gain value of an image under a certain light source environment; S2, judging whether the red gain value and the blue gain value satisfy the condition that the red gain value is less than or equal to a first preset value and the blue gain value is more than or equal to a second preset value; if not, skipping to S4; S3, judging the light source environment as a first light source, setting a color correction matrix as a first color correction matrix, and skipping to S5; S4, judging the light source environment as a second light source, and setting the color correction matrix as a second color correction matrix; and S5, correcting the red component value, the green component value and the blue component value by the first color correction matrix or the second color correction matrix. With the color correction method, an image is corrected by setting different color correction matrixes according to different light source types so as to solve the technical problem that the traditional color correction method adopts the correction matrix with the single color.
Description
Technical field
The invention belongs to image processing field, relate in particular to a kind of color correcting method.
Background technology
Image restoration is a pith of image processing, and its main purpose is to improve picture quality.That degenerate when a given width of cloth or receive noise pollution image the time, utilizing certain priori of degradation phenomena to rebuild new image or recover original image is the main process that image restoration is handled.
In the prior art; Because CMOS (Complementary Metal Oxide Semiconductor; Complementary metal oxide semiconductors (CMOS)) influence of colored filter characteristic in the sensing device, often pure inadequately with the image color that the CMOS sensing device is taken, the color of image that promptly from cmos sensor, comes out has colour cast; Need certain method to proofread and correct, make image manifest pure color.
Usually the bearing calibration of usefulness is following; Take the picture of a color verification sheet (color checker)-Standard colour board; Calculate each color lump in the captured image color mean value and with the color check card in the standard value of corresponding color lump do comparison; Estimate each correction coefficient (color coefficient) should be regulated in the color correction matrix (color matrix) direction and scope, until the purpose that reaches colour correction.The color correction formula is following:
In the formula: R, G, B are respectively the standard value of red color component value in the Standard colour board, green component values, blue sub value, and r, g, b are respectively camera and take corresponding red color component value, green component values, the blue sub value value of image of getting off.Color matrix is a color matrix.But the good realization of fundamental color matrix (color matrix) is the key in the color correction.
F light (colour temperature 2700K) red component is more, and under F light during pictures taken, after shot picture was handled through the white balance in the image processing apparatus, though background has been adjusted to white, and the main body color was thin out, and it is very light that particularly yellow main body color is transferred; And main body can keep color preferably after finishing white balance under the higher light source of other colour temperature.To these two kinds of scenes, if use same group of color correction matrix, during the adjusting of main body color, the main body color relation has colour cast under other light under satisfying F light; During the adjusting of main body color, the main body color relation has colour cast under the F light under satisfying other light.This shows that the existing color correcting algorithm is difficult to adapt to photoenvironment complicated and changeable.
Summary of the invention
Existing color correcting method can not satisfy the correction of the image that all colour temperature environment are taken down simultaneously, the invention provides a kind of color correcting method, can solve the problem that existing color correcting method exists.
A kind of color correcting method comprises the steps:
S1, the red color component value of obtaining a certain lighting environment hypograph, green component values, blue sub value, red gain value, blue gain value;
S2, judge whether said red gain value and said blue gain value satisfy: said red gain value more than or equal to second preset value, if satisfy, jumps to step S3 smaller or equal to first preset value and said blue gain value; If do not satisfy, jump to step S4;
S3, judgement lighting environment are first light source, and the setpoint color correction matrix is the first color correction matrix, jumps to step S5;
S4, judgement lighting environment are secondary light source, and the setpoint color correction matrix is the second color correction matrix;
S5, utilize said first color correction matrix or the said second color correction matrix that said red color component value, green component values, blue sub value are proofreaied and correct.
Color correcting method of the present invention is according to the difference of light source kind; Setting the various colors correction matrix proofreaies and correct image; Solve the technical problem that existing color correcting method adopts the single color correction matrix to be run into, can satisfy the requirement of picture shot under all lighting environments being carried out colour correction.
Description of drawings
Fig. 1 is the color correcting method flow chart that the embodiment of the invention provides.
Fig. 2 be the embodiment of the invention provide change sketch map from low colour temperature color correction matrix when high colour temperature changes.
Fig. 3 be the embodiment of the invention provide change sketch map from high colour temperature color correction matrix when low colour temperature changes.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the present invention is solved, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Color correction matrix in the conventional images correcting algorithm satisfies the timing of the image that low colour temperature environment is taken down, just can not satisfy the correction of the image that high colour temperature environment is taken down; Otherwise, satisfy timing to the image of taking under the high colour temperature environment, just can not satisfy the correction of the image that low colour temperature environment is taken down.Given this, the invention provides a kind of image rectification algorithm, can well proofread and correct, solved the difficult problem in the conventional images bearing calibration picture shot under all colour temperature environment.
A kind of color correcting method, as shown in Figure 1, this algorithm comprises the steps:
S1, the red color component value of obtaining a certain lighting environment hypograph, green component values, blue sub value, red gain value, blue gain value;
S2, judge whether said red gain value and said blue gain value satisfy: said red gain value more than or equal to second preset value, if satisfy, jumps to step S3 smaller or equal to first preset value and said blue gain value; If do not satisfy, jump to step S4;
S3, judgement lighting environment are first light source, and the setpoint color correction matrix is the first color correction matrix, jumps to step S5;
S4, judgement lighting environment are secondary light source, and the setpoint color correction matrix is the second color correction matrix;
S5, utilize said first color correction matrix or the said second color correction matrix that said red color component value, green component values, blue sub value are proofreaied and correct.
Color correcting method of the present invention is set the various colors correction matrix image is proofreaied and correct according to the difference of light source kind, has solved the technical problem that existing color correcting method adopts the single color correction matrix to be run into.
Red color component value among the said step S1, green component values, blue sub value are for carrying out red color component value, green component values, the blue sub value after white balance is handled, red gain value and blue gain value when said red gain value and blue gain value are handled for image being carried out white balance to view data.
Because the figure kine bias that low colour temperature environment is taken down is red, the red gain value was far away littler than blue yield value when it was carried out the white balance colour correction; The figure kine bias that high colour temperature environment is taken down is blue, and the red gain value was bigger far away than blue yield value when it was carried out the white balance colour correction; Judge that then whether said red gain value and said blue gain value satisfy: said red gain value smaller or equal to first preset value and said blue gain value more than or equal to second preset value; If satisfy, judge that then lighting environment is first light source, the setpoint color correction matrix is the first color correction matrix; If do not satisfy, judge that then lighting environment is a secondary light source, the setpoint color correction matrix is the second color correction matrix.
As preferred version, choose the F light source for judging the boundary of low color temperature light sources and high color temperature light source, the value of red gain value and blue gain value when said first preset value and second preset value are respectively adjusting image white balance under the F light source color temperature.
Said first light source comprises: candle light, F light source etc.; The candle light colour temperature is 1930K; The F light source color temperature is 2700K; Said secondary light source comprises: U30 light source (Warm White Fluorescent; The U.S.'s warm white shop light source), TL84 light source (Europe, Japan, Chinese shop light source), CWF light source (Cool White Fluorescent; The U.S.'s cold white shop light source), D65 light source (Artificial Daylight, international standard alpine light) etc.; The U30 light source color temperature is 3000K; The TL84 light source color temperature is 4000K; The CWF light source color temperature is 4150K; The D65 light source color temperature is 6500K.
Known as those skilled in the art, the boundary light source is not limited to the F light source between high color temperature light source and the low color temperature light sources, and other light source is suitable equally, for example U30 light source, CWF light source etc.
If light source is first light source, the color of image of under this kind light source, taking is warm partially, sets the first corresponding color correction matrix when it is carried out colour correction; If the light source secondary light source, the color of image of under this kind light source, clapping look is colder, sets the second color correction matrix when it is carried out colour correction.The first color correction matrix and the second color correction matrix are independent of each other, and the first color correction matrix only plays regulating action to the image that first light source is taken down, and the second color correction matrix only plays regulating action to the image that secondary light source is taken down.
The said first color correction matrix computations method is following: under first light source, take color check card image; Calculate each color lump in the said color check card image color mean value and with the color check card in the standard value of corresponding color lump do comparison; Calculate each correction coefficient in the first color correction matrix, obtain the first color correction matrix.
The said second color correction matrix computations method is following: under secondary light source, take color check card image; Calculate each color lump in the said color check card image color mean value and with the color check card in the standard value of corresponding color lump do comparison; Calculate each correction coefficient in the second color correction matrix, obtain the second color correction matrix.
When shooting environmental from low color temperature light sources when high color temperature light source changes; When image is carried out color correction; The color correction matrix can cause the phenomenon of image/video picture sudden change as directly becoming the second color correction matrix from the first color correction matrix conversion, makes picture smooth inadequately.
In like manner; When shooting environmental from high color temperature light source when low color temperature light sources changes, when image was carried out color correction, the color correction matrix was as directly becoming the first color correction matrix from the second color correction matrix conversion; Can cause the phenomenon of video image picture sudden change equally, make picture smooth inadequately.
For solving this ill effect; When shooting environmental from first light source when secondary light source is changed, the color correction matrix is followed successively by: the first color correction matrix, (N-1)/N* first color correction matrix+1/N* second color correction matrix, (N-2)/N* first color correction matrix+2/N* second color correction matrix ..., the 2/N* first color correction matrix+(the N-2)/N* second color correction matrix, the 1/N* first color correction matrix+(N-1)/N* second color correction matrix, the second color correction matrix; Said N is smaller or equal to 15 integer more than or equal to 2.Like this, video image color slowly changes, and makes image change smooth, and the user feels good.The value of N is less, and the video image color velocity variations is fast; The value of N is bigger, and the video image color velocity variations is slower, but video image color changes smoothness, and the user feels good; But the value of N also needs restriction, if too little, the situation of color change possibly occur; If too big, color just can adjust for a long time, thereby causes adjustment efficient not high.
As preferred version; As shown in Figure 2; The value of said N gets 4, and said color correction matrix is followed successively by: the first color correction matrix, 3/4* first color correction matrix+1/4* second color correction matrix, 2/4* first color correction matrix+2/4* second color correction matrix, 1/4* first color correction matrix+3/4* second color correction matrix, the second color correction matrix.
When shooting environmental from secondary light source when first light source is changed, the color correction matrix is followed successively by: the second color correction matrix, (M-1)/M * second color correction matrix+1/ M *, the first color correction matrix, (M-2)/M * second color correction matrix+2/ M *, the first color correction matrix ..., 2/ M *, the second color correction matrix+(M-2)/M * first color correction matrix, 1/ M *, the second color correction matrix+(M-1)/M * first color correction matrix, the first color correction matrix; Said M is smaller or equal to 15 integer more than or equal to 2.Like this, video image color slowly changes, and makes image change smooth, and the user feels good.The value of M is less, and the video image color velocity variations is fast; The value of M is bigger, and the video image color velocity variations is slower, but video image color changes smoothness, and the user feels good; But the value of M also needs restriction, if too little, the situation of color change possibly occur; If too big, color just can adjust for a long time, thereby causes adjustment efficient not high.
As preferred version; As shown in Figure 3; The value of said M gets 4, and the color correction matrix is followed successively by: the second color correction matrix, 3/4* second color correction matrix+1/4* first color correction matrix, 2/4* second color correction matrix+2/4* first color correction matrix, 1/4* second color correction matrix+3/4* second color correction matrix, the first color correction matrix.
When light source color temperature changed, the change frequency of color correction matrix also had corresponding restriction, and each two field picture, two two field pictures or multiple image conversion are once.Each two field picture changes once, and change color is than very fast, and multiple image changes once, and change color is relatively more smooth.As preferred version, when the video image frame per second was 15 FPS (Frames per Second, per second shows frame number), the color correction matrix was selected per 2 frame transforms once.When the frame per second of video changes, smooth for making the video image conversion, the speed that needs adjustment color correction matrix to change.
Color correcting method of the present invention is set the various colors correction matrix image is proofreaied and correct according to the difference of light source kind, has solved the technical problem that existing color correcting method adopts the single color correction matrix to be run into.In any colour temperature photoenvironment picture shot, after employing this method is carried out colour correction to it, can both reach good visual effect.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a color correcting method is characterized in that, this method comprises the steps:
S1, the red color component value of obtaining a certain lighting environment hypograph, green component values, blue sub value, red gain value, blue gain value;
S2, judge whether said red gain value and said blue gain value satisfy: said red gain value more than or equal to second preset value, if satisfy, jumps to step S3 smaller or equal to first preset value and said blue gain value; If do not satisfy, jump to step S4;
S3, judgement lighting environment are first light source, and the setpoint color correction matrix is the first color correction matrix, jumps to step S5;
S4, judgement lighting environment are secondary light source, and the setpoint color correction matrix is the second color correction matrix;
S5, utilize said first color correction matrix or the said second color correction matrix that said red color component value, green component values, blue sub value are proofreaied and correct.
2. color correcting method as claimed in claim 1 is characterized in that, said first preset value and said second preset value are respectively red gain value and the blue gain value when under the F light source, regulating the image white balance.
3. color correcting method as claimed in claim 1; It is characterized in that; When shooting environmental from first light source when secondary light source is changed, the color correction matrix is followed successively by: the first color correction matrix, (N-1)/N* first color correction matrix+1/N* second color correction matrix, (N-2)/N* first color correction matrix+2/N* second color correction matrix ..., the 2/N* first color correction matrix+(the N-2)/N* second color correction matrix, the 1/N* first color correction matrix+(N-1)/N* second color correction matrix, the second color correction matrix; Said N is smaller or equal to 15 integer more than or equal to 2.
4. color correcting method as claimed in claim 3; It is characterized in that; The value of said N gets 4, and said color correction matrix is followed successively by: the first color correction matrix, 3/4* first color correction matrix+1/4* second color correction matrix, 2/4* first color correction matrix+2/4* second color correction matrix, 1/4* first color correction matrix+3/4* second color correction matrix, the second color correction matrix.
5. color correcting method as claimed in claim 1; It is characterized in that; When shooting environmental from secondary light source when first light source is changed, the color correction matrix is followed successively by: the second color correction matrix, (M-1)/M * second color correction matrix+1/ M *, the first color correction matrix, (M-2)/M * second color correction matrix+2/ M *, the first color correction matrix ..., 2/ M *, the second color correction matrix+(M-2)/M * first color correction matrix, 1/ M *, the second color correction matrix+(M-1)/M * first color correction matrix, the first color correction matrix; Said M is smaller or equal to 15 integer more than or equal to 2.
6. color correcting method as claimed in claim 5; It is characterized in that; The value of said M gets 4, and the color correction matrix is followed successively by: the second color correction matrix, 3/4* second color correction matrix+1/4* first color correction matrix, 2/4* second color correction matrix+2/4* first color correction matrix, 1/4* second color correction matrix+3/4* second color correction matrix, the first color correction matrix.
7. like each described color correcting method of claim 1 to 6; It is characterized in that; The said first color correction matrix computations method is following: under first light source, take color check card image; Calculate each color lump in the said color check card image color mean value and with the color check card in the standard value of corresponding color lump do comparison, calculate each correction coefficient in the first color correction matrix.
8. like each described color correcting method of claim 1 to 6; It is characterized in that; The said second color correction matrix computations method is following: under secondary light source, take color check card image; Calculate each color lump in the said color check card image color mean value and with the color check card in the standard value of corresponding color lump do comparison, calculate each correction coefficient in the second color correction matrix.
9. like each described color correcting method of claim 3 to 6, it is characterized in that said each two field picture of color correction matrix, two two field pictures or multiple image conversion are once.
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| CN105812761A (en) * | 2015-08-03 | 2016-07-27 | 维沃移动通信有限公司 | Image color reduction method and terminal |
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| TWI549511B (en) * | 2014-03-19 | 2016-09-11 | 智原科技股份有限公司 | Image sensing apparatus and color-correction matrix correcting method and look-up table establishing method |
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| CN107677377A (en) * | 2017-09-25 | 2018-02-09 | 北京小米移动软件有限公司 | Determine the method and device of colour temperature |
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| CN108495101A (en) * | 2018-04-08 | 2018-09-04 | 北京大恒图像视觉有限公司 | A kind of method for correcting image, device, image capture device and readable storage medium storing program for executing |
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| CN111955004B (en) * | 2018-06-18 | 2022-02-25 | Jvc建伍株式会社 | Color correction device |
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Effective date of registration: 20191227 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: Shenzhen BYD Microelectronics Co., Ltd. Address before: BYD 518118 Shenzhen Road, Guangdong province Pingshan New District No. 3009 Patentee before: Biyadi Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. |