CN106204500B - A method of realizing that different cameral shooting Same Scene color of image remains unchanged - Google Patents
A method of realizing that different cameral shooting Same Scene color of image remains unchanged Download PDFInfo
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Abstract
The invention discloses a kind of methods realized different cameral shooting Same Scene color of image and remained unchanged, the characteristics of image that extraction different cameral takes first, then the image of one group of known luminaire color and its real light sources are converted into corresponding image and real light sources under different cameral, image after conversion is gone to school the regression matrix between the characteristics of image and real light sources that acquistion is shot to different cameral, to estimate the light source colour of image that different cameral takes, and then remove the colour cast for the image that different cameral takes；Camera transition matrix is finally utilized, the image after each camera removal colour cast is unified for the image shot under same camera, achievees the purpose that realize that the color of image of different cameral shooting Same Scene remains unchanged.
Description
Technical field
The invention belongs to computer visions and technical field of image processing, and in particular to a kind of realization different cameral shooting is same
The design of the one constant method of scene image color keep.
Background technology
The color of image obtained when different cameral shooting Same Scene is often widely different, even the camera of same brand
Sometimes it also will appear this case, for example CANON 1D cameras and the image of the Same Scene of CANON 5D cameras shooting just have very
Apparent difference.The reason of generating this phenomenon, being firstly because different cameral has different color sensitivity receptance functions,
Cause the original image color taken with regard to different.Secondly, different camera internals can carry out not the picture taken
Same processing, such as the enhancing of white balance, edge, denoising, compression etc., wherein different degrees of white balance can further influence again
Color of image so that difference occurs in the same width color of image of the final shooting of different cameral.
For occasions such as the practical applications such as color-match of live telecast, 3D cameras, different cameral is needed to shoot same
Piece image color does not have difference.How to realize that the color of image of different cameral shooting Same Scene remains unchanged just seems particularly
It is important.Comparing classical method has the method proposed in 2014 such as Javier Vazquez-Corral, bibliography：
J.Vazquez-Corral and M.Bertalm í o, " Color stabilization along time and across
Shots of the same scene, for one or several cameras of unknown specifications "
IEEE Trans.Image Process, vol.23, pp.4564-4575, Oct.2014.This method is shot by different cameral
The difference of image of Same Scene carry out learning correction matrix, and then complete the correction to picture color.The main of this method lacks
Point is the complicated learning process of needs, is required for the picture of a large amount of same scene raw and jpg formats to instruct in each camera
Practice, calculate complexity, flexibility is poor.This method can not also correct in image due to colour cast problem caused by light source difference simultaneously.
Invention content
The purpose of the present invention is to solve the Same Scene images that different cameral in the prior art takes not to share the same light
Color different problems under source, it is proposed that a method of realizing that different cameral shooting Same Scene color of image remains unchanged.
The technical scheme is that：A kind of side for realizing different cameral shooting Same Scene color of image and remaining unchanged
Method includes the following steps：
The characteristics of image that S1, extraction different cameral take：It is shot using static Illuminant estimation method estimation different cameral
The light source of the same piece image arrived, will be per the corresponding all estimated results of piece image and cross term as characteristics of image；
S2, learn different cameral feature and light source regression matrix：By the training image of real light sources known to one group and
Its real light sources is converted in step S1 corresponding image and real light sources under different cameral using camera transition matrix, is converting
Feature identical with step S1 is extracted on image afterwards respectively, obtains corresponding eigenmatrix；By the method for recurrence, calculate
Regression matrix between the corresponding feature of different cameral and light source；
The colour cast for the image that S3, correction different cameral are shot：For each camera, the feature that will be extracted in step S1
It is multiplied with the obtained regression matrix of step S2, obtains the final estimation light source of the image of camera shooting；Utilize each face of image
The mode that colouring component is divided by with light source, removes the colour cast for the image that each camera takes；
The influence of S4, correcting camera color sensitivity receptance function：Using camera transition matrix, step S3 is obtained every
A camera without colour cast image be unified under the same camera that shooting obtains without colour cast image.
Further, the static Illuminant estimation method in step S1 is Grey-World and Grey-Edge methods, specific mistake
Journey is as follows：Calculative feature is respectively the mean value in tri- channels image R, G, B and the mean value of three channel edges, introduces and hands over
Item is pitched, the final mean value for being characterized as tri- channels R, G, B, the mean value of tri- channel edges of R, G, B, the channels R are multiplied with the channels G
Mean value later opens radical sign, the channels R be multiplied with channel B after mean value open radical sign and the channels G be multiplied with B after mean value
Radical sign is opened, totally 9 features.
Further, the method for the recurrence in step S2 is nonlinear neural network, support vector machines or least square method.
Further, the camera transition matrix in step S2 and step S4 calculates different cameral by least square method
Transition matrix of the receptance function between the response of same given surface reflectivity obtains.
The beneficial effects of the invention are as follows：The present invention extracts the feature for the image that different cameral takes first, then by one
The image and its real light sources of group known luminaire color are converted to corresponding image and real light sources under different cameral, after conversion
Image go to school the regression matrix between the characteristics of image and real light sources that acquistion is shot to different cameral, to estimate different phases
The light source colour for the image that machine takes, and then remove the colour cast for the image that different cameral takes；Finally camera is utilized to convert
Image after each camera removal colour cast is unified for the image shot under same camera, reaches realization not by matrix
The purpose that the color of image of Same Scene remains unchanged is shot with camera.The present invention does not have any parameter, the conversion between camera
Regression matrix between characteristics of image and real light sources that matrix and each camera take need to only calculate once
To decide, it can directly be built in color of the camera internal for stablizing the same piece image that different cameral takes.
Description of the drawings
Fig. 1 is a kind of method stream realized different cameral shooting Same Scene color of image and remained unchanged provided by the invention
Cheng Tu.
Fig. 2 is the pic1 schematic diagrames of the embodiment of the present invention.
Fig. 3 is the pic2 schematic diagrames of the embodiment of the present invention.
Fig. 4 is the 930 camera response function curve graphs of SONY DXC of the embodiment of the present invention.
Fig. 5 is the NIKON D70 camera response function curve graphs of the embodiment of the present invention.
Fig. 6 is the pic3 schematic diagrames of the embodiment of the present invention.
Fig. 7 is the pic4 schematic diagrames of the embodiment of the present invention.
Fig. 8 is the pic5 schematic diagrames of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
Different cameral has different color sensitivity receptance functions, this difference can be by learning a camera conversion
Matrix removes, and based on this, the present invention provides a kind of sides for realizing different cameral shooting Same Scene color of image and remaining unchanged
Method, as shown in Figure 1, including the following steps：
The characteristics of image that S1, extraction different cameral take：It is shot using static Illuminant estimation method estimation different cameral
The light source of the same piece image arrived, will be per the corresponding all estimated results of piece image and cross term as characteristics of image.
In the embodiment of the present invention, static Illuminant estimation method is using Grey-World and Grey-Edge methods, detailed process
It is as follows：Calculative feature is respectively the mean value in tri- channels image R, G, B and the mean value of three channel edges, introduces and intersects
, the final mean value for being characterized as tri- channels R, G, B, the mean value of tri- channel edges of R, G, B, the channels R are multiplied it with the channels G
Mean value afterwards opens radical sign, the channels R be multiplied with channel B after mean value open radical sign and the channels G be multiplied with B after mean value open
Radical sign, totally 9 features.
S2, learn different cameral feature and light source regression matrix：By the training image of real light sources known to one group and
Its real light sources is converted in step S1 corresponding image and real light sources under different cameral using camera transition matrix, is converting
Feature identical with step S1 is extracted on image afterwards respectively, obtains corresponding eigenmatrix；By the method for recurrence, calculate
Regression matrix between the corresponding feature of different cameral and light source.
It is linear that nonlinear neural network, support vector machines, least square method etc. may be used in the method returned in the step
With nonlinear homing method.
The colour cast for the image that S3, correction different cameral are shot：For each camera, the feature that will be extracted in step S1
It is multiplied with the obtained regression matrix of step S2, obtains the final estimation light source of the image of camera shooting；Utilize each face of image
The mode that colouring component is divided by with light source, removes the colour cast for the image that each camera takes；
The influence of S4, correcting camera color sensitivity receptance function：Using camera transition matrix, step S3 is obtained every
A camera without colour cast image be unified under the same camera that shooting obtains without colour cast image.
Camera transition matrix in step S2 and step S4 calculates the receptance function pair of different cameral by least square method
Transition matrix between the response of same given surface reflectivity obtains.
Below with a specific embodiment to a kind of realization different cameral shooting Same Scene image face provided by the invention
The method that color remains unchanged is described further：
Artificial synthesized surface is carried above and below the image library website for estimating scene light source colour internationally recognized at present
Reflectivity S, and download 321 width colour cast image T and its real light sources L conducts that the image library is shot by 930 cameras of SONY DXC
Training set.SONY DXC 930, NIKON D70 and CANON5D are downloaded from internationally recognized camera response function website simultaneously
Camera color sensitivity receptance function data.It downloads under two width same scenes and is shot by NIKON D70 and CANON 5D simultaneously
Image be respectively designated as pic1 and pic2 as shown in Figure 2 and Figure 3 and tested.Two images are all without passing through any camera
The pretreatment (such as tint correction, the correction of gamma values) of itself.Then detailed step of the invention is as follows：
The characteristics of image that S1, extraction different cameral take：Estimate different cameral using static Illuminant estimation method
The light source for the same piece image (pic1 and pic2) that (NIKON D70 and CANON 5D) takes, will be corresponding per piece image
All estimated results and cross term are as characteristics of image.
Here static Illuminant estimation method includes Grey-World, Grey-Edge, White-Patch etc. a variety of classical
Static Illuminant estimation method.
In the embodiment of the present invention, estimate light sources using two kinds of static methods of Grey-World and Grey-Edge, with pic1 with
For pic2, light source approach is estimated using Grey-World, the mean value in three channels being calculated is respectively (0.1600
0.72540.1146), (0.5169 0.3170 0.1661) estimate light source approach using Grey-Edge, are calculated three and lead to
The mean value at road edge is respectively (0.1572 0.7295 0.1133), (0.5126 0.3213 0.1661).After introducing cross term,
The eigenmatrix of pic1 is stc1 and the eigenmatrix of pic2 is that stc2 is respectively：
Stc1=[0.1600 0.7254 0.1146 0.1572 0.7295 0.1133 0.3407 0.1354
0.2883]；
Stc2=[0.5169 0.3170 0.1661 0.5126 0.3213 0.1661 0.4048 0.2930
0.2295]。
S2, learn different cameral feature and light source regression matrix：By the training image of real light sources known to one group
(SONY DXC 930 arrive NIKON D70 and SONY using camera transition matrix by (321 width colour cast image T) and its real light sources L
DXC930 to CANON 5D) be converted to corresponding image under different cameral in step S1 (NIKON D70 and CANON 5D) (TN with
TC) with real light sources (LN and LC), feature identical with step S1 is extracted on image (TN and TC) after conversion respectively, is obtained
Corresponding eigenmatrix (FN and FC).By the method for recurrence, returning between the corresponding feature of different cameral and light source is calculated
Return Matrix C 1 and C2.
Here the method returned may be used nonlinear neural network, support vector machines, least square method etc. linearly with it is non-
Linear homing method.Using least square method as homing method in the embodiment of the present invention,
Specifically calculating process is：By formula (1) (2) and combine least square method, be calculated NIKON D70 with
The corresponding regression matrix C1 and C2 of CANON5D cameras.
LN=FN × C1 (1)
LC=FC × C2 (2)
Final calculation result is：
The specific camera transition matrix process for calculating SONY DXC 930 to NIKON D70 is as follows：
The response R1 of 930 cameras pair of a SONY DXC given surface reflectivity S is calculated according to formula (3) first：
R1=CSS1 × S (3)
CSS1 indicates that the camera color sensitivity receptance function of SONY DXC 930, function curve are as shown in Figure 4 in formula.
Then the response R2 of a NIKON D70 cameras pair given surface reflectivity S is calculated according to formula (4)：
R2=CSS2 × S (4)
CSS2 indicates that the camera color sensitivity receptance function of NIKON D70, function curve are as shown in Figure 5 in formula.
Finally by formula (5), and least square method is combined, the camera that SONY DXC 930 arrive NIKON D70 is calculated
Transition matrix C.
R2=R1 × C (5)
Final calculation result is：
The camera transition matrix that SONY DXC 930 arrive CANON 5D can similarly be calculated：
The colour cast for the image that S3, correction different cameral are shot：For each camera (NIKON D70 and CANON 5D),
The regression matrix (C1 and C2) that the feature extracted in step S1 (stc1 and stc2) is obtained with step S2 is multiplied, the phase is obtained
The final estimation light source L1=stc1*C1=(1.3831 2.1880 0.4735) of the image of machine shooting and L2=stc2*C2=
(1.8143 1.1406 0.6473) are L1=(0.3420 0.5410 0.1171), L2=(0.5037 after normalization
0.3166 0.1797).By each color component of image and light source be divided by the way of, remove the figure that each camera takes
The colour cast of picture, obtain pic1 and pic2 without colour cast figure, be respectively designated as pic3 and pic4, as shown in Figure 6, Figure 7.
By taking a pixel (0.0331,0.1570,0.0255) in pic1 as an example, become (0.0331/ after removing colour cast
0.3420,0.1570/0.5410,0.0255/0.1171)=(0.0968 0.2902 0.2178), position is corresponded in as pic3
The pixel value set.
The influence of S4, correcting camera color sensitivity receptance function：Using camera transition matrix, (NIKON D70 are arrived
CANON5D), by each camera that step S3 is obtained without colour cast image be unified for that shooting under the same camera obtains without colour cast figure
Picture.
The specific camera transition matrix for calculating NIKON D70 to CANON 5D is arrived with SONY DXC 930 in above-mentioned steps S2
The camera transform matrix calculations method of NIKON D70 is the same.The result of calculating is：
By step S3 obtain without for colour cast image pic3 and pic4, the corresponding camera of the two is respectively NIKON D70
With CANON 5D, here for being unified for CANON 5D camera images, the camera of pic3 and NIKON D70 to CANON 5D turns
Matrix multiple is changed, obtained image is named as pic5, as shown in Figure 8.
By taking the pic3 pixels (0.0968 0.2902 0.2178) after eliminating colour cast in step S3 as an example, with NIKON
The camera transition matrix multiplication of D70 to CANON 5D becomes：
Then (0.2051 0.2168 0.2950) are the pixel value of corresponding position in pic5.
It is mainly illustrated above as example using the single pixel of image point, reality is all pictures in entire image when calculating
It is carried out on vegetarian refreshments.
Comparison diagram 7 and Fig. 8 can be seen that：The color of the two is compared with artwork pic1 (Fig. 2) and pic2 (Fig. 3), more adjunction
Closely, show that the color of the same piece image taken by two kinds of cameras becomes stable.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill can make according to the technical disclosures disclosed by the invention various does not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (4)
1. a kind of method realized different cameral shooting Same Scene color of image and remained unchanged, which is characterized in that including following
Step：
The characteristics of image that S1, extraction different cameral take：It is taken using static Illuminant estimation method estimation different cameral
It, will be per the corresponding all estimated results of piece image and cross term is as characteristics of image with the light source of piece image；The intersection
Item is the internal chiasma of the corresponding estimated result of each width image；
S2, learn different cameral feature and light source regression matrix：By the training image of real light sources known to one group and its very
Real light source is converted in step S1 corresponding image and real light sources under different cameral using camera transition matrix, after conversion
Feature identical with step S1 is extracted on image respectively, obtains corresponding eigenmatrix；By the method for recurrence, it is calculated not
Regression matrix with camera between corresponding feature and light source；
The colour cast for the image that S3, correction different cameral are shot：For each camera, the feature and step that will be extracted in step S1
The regression matrix that rapid S2 is obtained is multiplied, and obtains the final estimation light source of the image of camera shooting；Utilize each color of image point
The mode that amount is divided by with the final estimation light source, removes the colour cast for the image that each camera takes；
The influence of S4, correcting camera color sensitivity receptance function：Using camera transition matrix, each phase that step S3 is obtained
Machine without colour cast image be unified under the same camera that shooting obtains without colour cast image.
2. the method according to claim 1 realized different cameral shooting Same Scene color of image and remained unchanged, special
Sign is that the static Illuminant estimation method in the step S1 is Grey-World and Grey-Edge methods, and detailed process is such as
Under：Calculative feature is respectively the mean value in tri- channels image R, G, B and the mean value of three channel edges, introduces and intersects
, the final mean value for being characterized as tri- channels R, G, B, the mean value of tri- channel edges of R, G, B, the channels R are multiplied it with the channels G
Mean value afterwards opens radical sign, the channels R be multiplied with channel B after mean value open radical sign and the channels G be multiplied with B after mean value open
Radical sign, totally 9 features.
3. the method according to claim 1 realized different cameral shooting Same Scene color of image and remained unchanged, special
Sign is that the method for the recurrence in the step S2 is nonlinear neural network, support vector machines or least square method.
4. the method according to claim 1 realized different cameral shooting Same Scene color of image and remained unchanged, special
Sign is that the camera transition matrix in the step S2 and step S4 calculates the response letter of different cameral by least square method
Transition matrix between several responses to same given surface reflectivity obtains.
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| CN112866667B (en) * | 2021-04-21 | 2021-07-23 | 贝壳找房(北京)科技有限公司 | Image white balance processing method and device, electronic equipment and storage medium |
| WO2023240650A1 (en) * | 2022-06-17 | 2023-12-21 | 北京小米移动软件有限公司 | Color correction matrix calibration method and apparatus for camera module |
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