CN104219511A - Color correction system and method - Google Patents
Color correction system and method Download PDFInfo
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- CN104219511A CN104219511A CN201310215655.6A CN201310215655A CN104219511A CN 104219511 A CN104219511 A CN 104219511A CN 201310215655 A CN201310215655 A CN 201310215655A CN 104219511 A CN104219511 A CN 104219511A
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Abstract
The present invention relates to a color correction system which is applied in electronic equipment with a photographing function. The electronic equipment comprises a memory. The color correction system comprises: an image acquiring module for acquiring an image, the image being composed of a plurality of pixel points in an array arrangement and comprising a standard color card image; an array acquiring module for extracting a color gradation value of the standard color card image and generating an array S, the array acquiring module further being used for performing a pseudo-inverse matrix operation so as to calculate a correction array M and store the correction array M into the memory; an image analyzing module for performing color gradation value extraction on each pixel point on the image and generating a plurality of arrays A; and an image correction module for correcting the color gradation value of each pixel point on the image so as to obtain a plurality of arrays B after each pixel point is corrected. The present invention further relates to a color correction method.
Description
Technical field
The present invention relates to a kind of color calibration system and method.
Background technology
Imageing sensor is seizure and process light signal is the signal of telecommunication, to form the semiconductor equipment of still image or video.The quality of the digital picture that imageing sensor produces, depends primarily on its sensitivity and many other factorses.Therefore, after imageing sensor is photosensitive, need through a series of process, to make the digital picture of formation meet human vision, typical image procossing comprises Automatic white balance, noise filtering, tone reproduction, Gamma correction, color saturation enhancing and colour correction etc.Wherein, colour correction is mainly in order to strengthen the accuracy of the color rendition of digital picture, and keep the true of color, what the digital picture of generation and human vision were seen is consistent.
Summary of the invention
In view of this, be necessary to provide a kind of color calibration system and the method that can strengthen the accuracy of the color rendition of image.
A kind of color calibration system, is applied to one and has in the electronic equipment of shoot function.Described electronic equipment comprises a memory.Described color calibration system comprises:
Image collection module, for obtaining an image, described image is formed by multiple pixel of arranging in array-like and is comprised a standard color card image;
Matrix acquisition module, for extracting the color range value of described standard color card image, and generates a matrix S; Described matrix acquisition module is further used for carrying out pseudo inverse matrix computing according to M × S=N, namely
,
wherein matrix N is the matrix of the color range value of the standard color card be stored on described memory, calculate a correction matrix M, and described correction matrix M is stored to described memory, described correction matrix M is used for correcting the color range value of each pixel of described image;
Image analysis module, for carrying out the extraction of color range value to each pixel on described image, and generates multiple matrix A;
Image correction module, for correcting the color range value of each pixel on described image, draw each pixel be corrected after multiple matrix B, i.e. M × A=B.
A kind of color correcting method, comprises the following steps:
Obtain an image, described image is formed by multiple pixel of arranging in array-like and is comprised the image of a standard color card;
Extract the color range value of the image of the standard color card on described image, and generate a matrix S;
Utilize the computing of pseudo inverse matrix, namely
,
, wherein N is the matrix of the color range value of the standard color card be stored on described memory, calculates a correction matrix M, and described correction matrix M is stored to memory, and the color range value for each pixel to described image corrects;
Extract the color range value of each pixel of described image, and generate multiple matrix A;
Correct the color range value of each pixel on described image, i.e. M × A=B, the matrix after the color range value of each pixel that wherein B represents on described image is corrected.
Compared with prior art, color calibration system provided by the invention and method, utilize the compute mode of pseudo inverse matrix, calculates a correction matrix, and then utilize the color range value of described correction matrix to each pixel of image to correct, enhance the accuracy of the color rendition of described image.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of color calibration system provided by the invention.
Fig. 2 is the schematic diagram of the image that the image collection module in Fig. 1 is taken.
Fig. 3 is the flow chart of the color correcting method utilizing the color calibration system shown in Fig. 1.
Main element symbol description
| Color calibration system | 10 |
| Image collection module | 11 |
| Matrix acquisition module | 12 |
| Image analysis module | 13 |
| Image correction module | 14 |
| Electronic equipment | 20 |
| Memory | 21 |
| Image | 30 |
| Standard color card image | 31 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
To be described in further detail embodiment of the present invention below in conjunction with accompanying drawing.
See also Fig. 1 and Fig. 2, color calibration system 10 provided by the invention is applied to one and has in the electronic equipment 20 of shoot function, and described electronic equipment 20 comprises a memory 21.Described memory 21 is for storing the color range value of a standard color card.In present embodiment, described standard color card comprises 24 kinds of colors, and therefore the color range value of described standard color card stores with the form of the matrix of 3 × 24, namely
N
3×24=
。
Described color calibration system 10 comprises image collection module 11, matrix acquisition module 12, image analysis module 13 and image correction module 14.The elements such as described image collection module 11, matrix acquisition module 12, image analysis module 13 and image correction module 14 are electrically connected transmission and the exchange of carrying out data each other directly or indirectly.
Described image collection module 11 is for obtaining an image 30, and described image 30 is formed by multiple pixel of arranging in array-like and comprised a standard color card image 31.
Described matrix acquisition module 12 for extracting the color range value of described standard color card image 31, and generates a matrix S.In present embodiment, the color range value matrix N of corresponding standard color card, the color range value matrix S of described standard color card image 31 are similarly the matrix of 3 × 24, namely
S
3×24=
。
Described matrix acquisition module 12 is further used for the computing utilizing pseudo inverse matrix, calculates a correction matrix M, and described correction matrix M is stored to described memory 21.Described correction matrix M is the matrix form of one 3 × 3, namely
M
3×3=
。
Described correction matrix M is used for carrying out colour correction to each pixel on described image 30.Concrete, according to
, carry out pseudo inverse matrix computing, calculate described canonical matrix M.Computational process is as follows:
, wherein, matrix
representing matrix
transposition;
, wherein, matrix
representing matrix
inverse matrix.
Described image analysis module 13 for carrying out the extraction of color range value to each pixel on described image 30, and generates multiple matrix A.Concrete, described image 30 has x × y pixel, and therefore, the color range value of the multiple pixels on described image generates the matrix A of x 3 × y, namely
A
1=
，…，A
x=
。
Be understandable that, the storage mode of the color range value of the multiple pixels on described image 30 is not limited thereto.Such as, the color range value of the multiple pixels on described image 30 also can be the form of the matrix A of y 3 × x.
Described image correction module 14 is for correcting the color range value of each pixel on described image 30.Concrete, by the color range value matrix A of each pixel on described image 30
1..., A
ncarry out matrix operation with described correction matrix M, draw each pixel be corrected after matrix B
1..., B
n, that is, M × A
1=B
1..., M × A
n=B
n.
Described image analysis module 13 and described image correction module 14 are further used for utilizing correction matrix M to correct the color range value of each pixel of the arbitrary image that follow-up described image collection module 11 is taken.
Refer to Fig. 3, color correcting method provided by the invention, comprises the following steps:
S101: obtain an image 30, described image 30 is formed by multiple pixel of arranging in array-like and is comprised a standard color card image 31.
S102: the color range value extracting described standard color card image 31, and generate a matrix S.
Concrete, the matrix S of the color range value of described standard color card image 31 is the matrix form of 3 × 24, namely
S
3×24=
。
S103: the computing utilizing pseudo inverse matrix, calculates a correction matrix M.
Concrete, according to
, wherein N
3 × 24represent the matrix of the color range value of standard color card, and then carry out the computing of pseudo inverse matrix, namely
,
, calculate correction matrix M.
S104: the color range value extracting each pixel of described image 30, and generate multiple matrix A.
Concrete, described image 30 has x × y pixel, and the matrix of the color range value of the multiple pixels on described image 30 is the form of the matrix A of x 3 × y, namely
A
1=
，…，A
x=
。
S105: the color range value correcting each pixel on described image 30.
By the color range value matrix A of each pixel on described correction matrix M and described image 30
1..., A
ncarry out matrix operation, draw each pixel be corrected after matrix B
1..., B
n, that is, M × A
1=B
1..., M × A
n=B
n.
Repeat step S101, S104, S105, correction matrix M can be utilized to correct the color range value of each pixel of the arbitrary image that follow-up described image collection module 11 is taken.
Color calibration system provided by the invention and method, utilize the compute mode of pseudo inverse matrix, calculates a correction matrix, and then utilize the color range value of described correction matrix to each pixel of image to correct, and enhances the accuracy of the color rendition of image.
Be understandable that, for the person of ordinary skill of the art, other various corresponding change and distortion can be made by technical conceive according to the present invention, and all these change the protection range that all should belong to the claims in the present invention with distortion.
Claims (6)
1. a color calibration system, be applied to one and have in the electronic equipment of shoot function, described electronic equipment comprises a memory, and described color calibration system comprises:
Image collection module, for obtaining an image, described image is formed by multiple pixel of arranging in array-like and is comprised a standard color card image;
Matrix acquisition module, for extracting the color range value of described standard color card image, and generates a matrix S; Described matrix acquisition module is further used for carrying out pseudo inverse matrix computing according to M × S=N, namely
,
wherein matrix N is the matrix of the color range value of the standard color card be stored on described memory, calculate a correction matrix M, and described correction matrix M is stored to described memory, described correction matrix M is used for correcting the color range value of each pixel of described image;
Image analysis module, for carrying out the extraction of color range value to each pixel on described image, and generates multiple matrix A;
Image correction module, for correcting the color range value of each pixel on described image, draw each pixel be corrected after multiple matrix B, i.e. M × A=B.
2. color calibration system as claimed in claim 1, it is characterized in that: described matrix N and S are the matrix of one 3 × 24, described matrix M is the matrix of one 3 × 3.
3. color calibration system as claimed in claim 1, is characterized in that: described matrix A is the matrix of x 3 × y, and wherein x, y represent the number of pixels of described image row, column respectively.
4. a color correcting method, comprises the following steps:
Obtain an image, described image is formed by multiple pixel of arranging in array-like and is comprised the image of a standard color card;
Extract the color range value of the image of the standard color card on described image, and generate a matrix S;
Utilize the computing of pseudo inverse matrix, namely
,
, wherein N is the matrix of the color range value of the standard color card be stored on described memory, calculates a correction matrix M, and described correction matrix M is stored to memory, and described correction matrix M is used for correcting the color range value of each pixel of described image;
Extract the color range value of each pixel of described image, and generate multiple matrix A;
Correct the color range value of each pixel on described image, i.e. M × A=B, the matrix after the color range value of each pixel that wherein B represents on described image is corrected.
5. color correcting method as claimed in claim 4, it is characterized in that: described matrix N and S are the matrix of one 3 × 24, described matrix M is the matrix of one 3 × 3.
6. color correcting method as claimed in claim 4, is characterized in that: described matrix A is the matrix of x 3 × y, and wherein x, y represent the number of pixels of described image row, column respectively.
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| CN105678710A (en) * | 2016-01-14 | 2016-06-15 | 佛山华芯微特科技有限公司 | Color correction and restoration system and color correction and restoration method |
| CN105827897A (en) * | 2015-11-16 | 2016-08-03 | 维沃移动通信有限公司 | Adjustment card manufacturing method, system, color correction matrix debugging method and device |
| 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 |
| CN109274948A (en) * | 2017-07-17 | 2019-01-25 | 深圳市道通智能航空技术有限公司 | Image color correction method, apparatus, storage medium and computer equipment |
| WO2020037635A1 (en) * | 2018-08-24 | 2020-02-27 | 华为技术有限公司 | Color correction method and apparatus |
| WO2020097802A1 (en) * | 2018-11-13 | 2020-05-22 | 华为技术有限公司 | Image colour correction method and device, and storage medium |
| CN111443087A (en) * | 2020-04-07 | 2020-07-24 | 北京农业信息技术研究中心 | Chlorophyll detection device and method |
| CN112858268A (en) * | 2020-09-18 | 2021-05-28 | 武汉大学 | Soil water and solute migration university measuring method based on chemical imaging-correction analysis |
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| CN111443087A (en) * | 2020-04-07 | 2020-07-24 | 北京农业信息技术研究中心 | Chlorophyll detection device and method |
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Application publication date: 20141217 |