CN1323558C - Color amendment apparatus and method for image forming device - Google Patents

Abstract

The present invention provides a color correction device which utilizes a first image forming device which is well corrected for correcting a color sensed by a second image forming device. The second image forming device and the first image forming device are completely identical. A color correction device is arranged in the second image forming device. A first image which relates to a standard color card is formed by being taken by the first image forming device under a standard environment. The standard color card is has N standard color chunks. Each of the N standard color chunks of the first image respectively has M individual first color values. M and N are respectively a natural number. The color correction device comprises a receiving module, a first matrix generating module, an image taking module, a second matrix generating module, a data processing module, a storage module and a color correction module.

Description

The color correction equipment of Equipment for forming image and method

Technical field

The invention relates to a kind of color correction equipment and method of Equipment for forming image, particularly about color correction equipment in the fabrication schedule of Equipment for forming image and method.

Background technology

The Equipment for forming image of knowing, for example digital camera, digital camera etc. all have an optical sensing subassembly in order to induction and measure the light imported by the Equipment for forming image outside to form an image in this Equipment for forming image.Optical sensing subassembly is combined by electronics and mechanism element, because the property difference of each part, so the photobehavior of each optical sensing subassembly of coming out of manufacturing is all slightly different.Analyze the photobehavior of optical sensing subassembly from the angle of the three primary colors (red light R, green light G, blue light B) of light, the optical sensing subassembly that has is relatively poor at the sensing function of red light, and the optical sensing subassembly that has is then relatively poor to the sensing function of green light.Therefore with two Equipment for forming image of style under identical environment, same scene institute picked image is had an opportunity because above-mentioned former thereby present slightly color distortion, therefore when making these Equipment for forming image, must do the color correction at every Equipment for forming image.

Summary of the invention

The color correction equipment and the method that the purpose of this invention is to provide an Equipment for forming image, during the manufacturing that the color correction equipment of Equipment for forming image and method are used to Equipment for forming image crosses Equipment for forming image is done the device and method of auto color correction, so that have consistent color representation via all Equipment for forming image of same manufacturing process manufacturing.

Color correction equipment and method according to Equipment for forming image of the present invention, the color correction equipment of Equipment for forming image utilizes first Equipment for forming image (imageforming apparatus) of a process well-corrected (well-calibrated) to revise the color that is sensed by one second Equipment for forming image, second Equipment for forming image and first Equipment for forming image identical (identical), color correction equipment also is installed in second Equipment for forming image, one first image about a standard color card is captured down in a border quasi by first Equipment for forming image and forms, standard color card has N standard color block (color block), each standard color block in the N of first image standard color block has M each other first color-values (color values) respectively, M and N are for being respectively a natural number, color correction equipment comprises, a receiver module, one first matrix generation module, one image acquisition module, one second matrix generation module, one data processing module, one storage module and a color correcting module.Receiver module is in order to receive first image that is transmitted from first Equipment for forming image.The first matrix generation module produces first matrix of M N * 1 (Di) according to first image, and each first matrix of individual first matrix of M is made up of i color-values of N standard color block of first image respectively, and i is the integer index in 1 to the M scope.Down acquisition is about one second image of standard color card in standard environment for image acquisition module, and each the standard color block in the N of second image standard color block has M respectively other second color-values respectively.The second matrix generation module produces second matrix of one N * M (A) according to second image, and second matrix is made up of M second color-values of N standard color block of second image.Data processing module goes out the color correction matrix of one M * M (θ) based on M first matrix and second matrix computations.Storage module is in order to store the color correction matrix.When second Equipment for forming image was started shooting, the color correction module i.e. acquisition color correction matrix from storage module, color correction module and revise the color that second Equipment for forming image is sensed according to the color correction matrix.

Description of drawings

Can be further understood by following detailed Description Of The Invention and institute's accompanying drawing about the advantages and spirit of the present invention:

Fig. 1 is the color correction equipment schematic diagram of Equipment for forming image of the present invention.

Fig. 2 is the standard color card schematic diagram of color correction equipment of the present invention.

Fig. 3 is the color correction equipment schematic diagram of another specific embodiment of Equipment for forming image of the present invention.

Fig. 4 is the flow chart of the color correction method of Equipment for forming image of the present invention.

Fig. 5 is the generation flow chart of color correction matrix in the color correction method of Fig. 4 Equipment for forming image.

Embodiment

See also Fig. 1, Fig. 1 is color correction equipment 10 schematic diagrames of Equipment for forming image of the present invention.Color correction equipment 10 utilizes first Equipment for forming image 12 (image forming apparatus) of a process well-corrected (well-calibrated) to revise the color that is sensed by one second Equipment for forming image 14, second Equipment for forming image 14 and first Equipment for forming image 12 identical (identical), this color correction equipment also is installed in this second Equipment for forming image.Color correction equipment 10 comprises a receiver module 22, one first matrix generation module 24, an image acquisition module 26, one second matrix generation module 28, a data processing module 30, a storage module 32 and a color correcting module 34.

See also Fig. 1 and Fig. 2, Fig. 2 is the standard color card schematic diagram of color correction equipment 10 of the present invention.One first image 18 about a standard color card 16 is captured down in a standard environment by first Equipment for forming image 12 and forms.Standard color card 16 has nine standard color block 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i (color block), nine standard color block 20a of first image 18,20b, 20c, 20d, 20e, 20f, 20g, 20h, each standard color block 20a among the 20i, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i has three each other first color-values R respectively, G, B (colorvalues), corresponding to standard color block 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i is respectively with (Ra, Ga, Ba) represent the first color-values R of standard color block 20a, G, B, and with (Rb, Gb Bb) represents the first color-values R of standard color block 20b, G, B, all the other are then analogized and are (Rc, Gc, Bc), (Rd, Gd, Bd), (Re, Ge, Be), (Rf, Gf, Bf), (Rg, Gg, Bg), (Rh, Gh, Bh), (Ri, Gi, Bi).

Receiver module 22 is in order to receive first image 18 that is transmitted from first Equipment for forming image 12.

The first matrix generation module 24 produces three 9 * 1 first matrix D 1, D2, D3 according to first image 18, and first matrix D 1, each first matrix D 1 of D2, D3, D2, D3 are made up of nine standard color block 20a, 20b, 20c, 20d, 20e, 20f, 20g, the first color-values R of 20h, 20i, G, the B of first image 18 respectively.

$D1=\left[\begin{array}{c}\mathrm{Ra}\\ \mathrm{Rb}\\ \mathrm{Rc}\\ \mathrm{Rd}\\ \mathrm{Re}\\ \mathrm{Rf}\\ \mathrm{Rg}\\ \mathrm{Rh}\\ \mathrm{Ri}\end{array}\right];$ $D2=\left[\begin{array}{c}\mathrm{Ga}\\ \mathrm{Gb}\\ \mathrm{Gc}\\ \mathrm{Gd}\\ \mathrm{Ge}\\ \mathrm{Gf}\\ \mathrm{Gg}\\ \mathrm{Gh}\\ \mathrm{Gi}\end{array}\right];$ $D3=\left[\begin{array}{c}\mathrm{Ba}\\ \mathrm{Bb}\\ \mathrm{Bc}\\ \mathrm{Bd}\\ \mathrm{Be}\\ \mathrm{Bf}\\ \mathrm{Bg}\\ \mathrm{Bh}\\ \mathrm{Bi}\end{array}\right];$

Image acquisition module 26 captures one second image 36 about standard color card 16 under standard environment, nine standard color block 20a ' of second image 36,20b ', 20c ', 20d ', 20e ', 20f ', 20g ', 20h ', each standard color block 20a ' among the 20i ', 20b ', 20c ', 20d ', 20e ', 20f ', 20g ', 20h ', 20i ' has 3 each other second color-values R ' respectively, G ', B ', corresponding to standard color block 20a ', 20b ', 20c ', 20d ', 20e ', 20f ', 20g ', 20h ', 20i ' respectively with (R ' a, G ' a, B ' a) represents the second color-values R ' of standard color block 20a ', G ', B ', and with (R ' b, G ' b, B ' b) represents the second color-values R ' of standard color block 20b ', G ', B ', all the other then analogize for (R ' c, G ' c, B ' c), (R ' d, G ' d, B ' d), (R ' e, G ' e, B ' e), (R ' f, G ' f, B ' f), (R ' g, G ' g, B ' g), (R ' h, G ' h, B ' h), (R ' i, G ' i, B ' i).

The second matrix generation module 28 produces one 9 * 3 second matrix A according to second image 36, and second matrix A is made up of nine standard color block 20a ', 20b ', 20c ', 20d ', 20e ', 20f ', 20g ', the second color-values R ' of 20h ', 20i ', G ', the B ' of second image 36.

$A=\left[\begin{array}{ccc}R\text{'}a& G\text{'}a& B\text{'}a\\ R\text{'}b& G\text{'}b& B\text{'}b\\ R\text{'}c& G\text{'}c& B\text{'}c\\ R\text{'}d& G\text{'}d& B\text{'}d\\ R\text{'}e& G\text{'}e& B\text{'}e\\ R\text{'}f& G\text{'}f& B\text{'}f\\ R\text{'}g& G\text{'}g& B\text{'}g\\ R\text{'}h& G\text{'}h& B\text{'}h\\ R\text{'}i& G\text{'}i& B\text{'}i\end{array}\right]$

Data processing module 30 calculates one 3 * 3 color correction matrix θ based on three first matrix D 1, D2, D3 and second matrix A.32 of storage modules are in order to store color correction matrix θ.

$\mathrm{\θ}=\left[\begin{array}{ccc}{a}_{11}& a_{12}& a_{13}\\ a_{21}& a_{22}& a_{23}\\ a_{31}& a_{32}& a_{33}\end{array}\right]$

When the start of second Equipment for forming image 14, color correction module 34 i.e. acquisition color correction matrix θ from storage module 32, color correction module 34 and revise the color that second Equipment for forming image 14 is sensed according to color correction matrix θ.

Illustrate further, color correction matrix θ is formed by three 3 * 1 row matrix θ 1, θ 2, the matrix transpose that θ 3 is constituted,

$\mathrm{\θ}1=\left[\begin{array}{c}{a}_{11}\\ a_{12}\\ a_{13}\end{array}\right];$ $\mathrm{\θ}2=\left[\begin{array}{c}{a}_{21}\\ a_{22}\\ a_{23}\end{array}\right];$ $\mathrm{\θ}3=\left[\begin{array}{c}{a}_{31}\\ a_{32}\\ a_{33}\end{array}\right]$

And each element among the color correction matrix θ is calculated and get by the following row mathematical expressions of data processing module 30, and will calculate and must color correction matrix θ be stored in storage module 32.

(D1-A·θ1) ²＝0；

 (D2-A θ 2) ²=0; And

(D3-A·θ3) ²＝0。

So, when 14 starts of second Equipment for forming image, color correction module 34 i.e. acquisition color correction matrix θ from storage module 32, the second color-values R ', G ', the B ' of the color correction module 34 and second image 36 that second Equipment for forming image 14 is sensed form one 3 * 1 the second color-values row matrix Z, and color correction matrix θ is multiplied by the second color-values row matrix Z obtaining, by the second color-values R of the correction of second image of revising 38 ", G ", B " the second color-values row matrix X of the correction formed.

$Z=\left[\begin{array}{c}R\text{'}\\ G\text{'}\\ B\text{'}\end{array}\right];$ $X=\left[\begin{array}{c}R\text{'}\text{'}\\ G\text{'}\text{'}\\ B\text{'}\text{'}\end{array}\right]$

X＝θ×Z

Comprehensively above-mentioned, the color correction equipment 10 of Equipment for forming image of the present invention can produce a color correction matrix θ in Equipment for forming image, and Equipment for forming image done the auto color correction, so that with the Equipment for forming image of style under identical environment, can have identical color representation to same scene institute picked image.

In addition, in above-mentioned specific embodiment, the first color-values R, G, B and the second color-values R ', G ', B ' all comprise red R, R ', green G, G ' and three kinds of basic colors such as blue B, B '.Therefore, by the conversion rule of knowing (equation as follows), can comprise brightness Y, Y ', red difference Cr, Cr ' and three kinds of the 3rd color-values Y, Cr, Cb and the 4th color-values Y ', Cr ', Cb ' that basic colors is represented such as green difference Cb, Cb ' with comprising the first color-values R, G, B and the second color-values R ', G ', the B ' of red R, R ', green G, G ' and three kinds of basic colors such as blue B, B ', being converted to.

$\left[\begin{array}{c}Y\\ \mathrm{Cr}\\ \mathrm{Cb}\end{array}\right]=\left[\begin{array}{ccc}0.299& 0.587& 0.114\\ -0.168& -0.331& 0.5\\ 0.5& -0.418& -0.081\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right]$

By above-mentioned conversion, the first matrix generation module 24 of the color correction equipment 10 of Equipment for forming image of the present invention and the second matrix generation module 28 then produce first matrix D 1 ', D2 ', D3 ' and second matrix A corresponding to three kinds of basic colors such as brightness Y, red difference Cr and green difference Cb respectively '.

$D1\text{'}=\left[\begin{array}{c}\mathrm{Ya}\\ \mathrm{Yb}\\ \mathrm{Yc}\\ \mathrm{Yd}\\ \mathrm{Ye}\\ \mathrm{Yf}\\ \mathrm{Yg}\\ \mathrm{Yh}\\ \mathrm{Yi}\end{array}\right];$ $D2\text{'}=\left[\begin{array}{c}\mathrm{Cra}\\ \mathrm{Crb}\\ \mathrm{Crc}\\ \mathrm{Crd}\\ \mathrm{Cre}\\ \mathrm{Crf}\\ \mathrm{Crg}\\ \mathrm{Crh}\\ \mathrm{Cri}\end{array}\right];$ $D3\text{'}=\left[\begin{array}{c}\mathrm{Cba}\\ \mathrm{Cbb}\\ \mathrm{Cbc}\\ \mathrm{Cbd}\\ \mathrm{Cbe}\\ \mathrm{Cbf}\\ \mathrm{Cbg}\\ \mathrm{Cbh}\\ \mathrm{Cbi}\end{array}\right]$

$A\text{'}=\left[\begin{array}{ccc}Y\text{'}a& \mathrm{Cr}\text{'}a& \mathrm{Cb}\text{'}a\\ Y\text{'}b& \mathrm{Cr}\text{'}b& \mathrm{Cb}\text{'}b\\ Y\text{'}c& \mathrm{Cr}\text{'}c& \mathrm{Cb}\text{'}c\\ Y\text{'}d& \mathrm{Cr}\text{'}d& \mathrm{Cb}\text{'}d\\ Y\text{'}e& \mathrm{Cr}\text{'}e& \mathrm{Cb}\text{'}e\\ Y\text{'}f& \mathrm{Cr}\text{'}f& \mathrm{Cb}\text{'}f\\ Y\text{'}g& \mathrm{Cr}\text{'}g& \mathrm{Cb}\text{'}g\\ Y\text{'}h& \mathrm{Cr}\text{'}h& \mathrm{Cb}\text{'}h\\ Y\text{'}i& \mathrm{Cr}\text{'}i& \mathrm{Cb}\text{'}i\end{array}\right]$

30 of data processing modules are based on three first matrix D 1 ', D2 ', D3 ' and second matrix A ' calculate one 3 * 3 color correction matrix θ '.

By color correction matrix θ ', the color correction equipment 10 of Equipment for forming image of the present invention can produce a color correction matrix θ ' in Equipment for forming image, with the reference value of adjusting as Equipment for forming image Automatic white balance (white balance), so that show in having identical white balance with the Equipment for forming image of style.

See also Fig. 3, Fig. 3 is color correction equipment 11 schematic diagrames of another specific embodiment of Equipment for forming image of the present invention.Color correction equipment 10 compared to Fig. 1, data processing module 31 is positioned at second Equipment for forming image, 14 outsides, what change speech is exactly the data processing module 31 that second Equipment for forming image 14 is sent to first matrix D 1, D2, D3 and second matrix A second Equipment for forming image, 14 outsides, to calculate color correction matrix θ, again color correction matrix θ is sent back the storage module 32 of second Equipment for forming image 14, to store color correction matrix θ.

See also Fig. 4, Fig. 4 is the flow chart of the color correction method of Equipment for forming image of the present invention.Below detailed description is applied to the color correction method of the Equipment for forming image of the present invention of Fig. 1.The color correction method of Equipment for forming image of the present invention comprises the following step:

S40: first image 18 is inputed to second Equipment for forming image 14 from first Equipment for forming image 12.

S42: descend one second image 36 of acquisition in standard environment about standard color card 16 by second Equipment for forming image 14.

S44:, in second Equipment for forming image 14, produce a color correction matrix θ based on first image 18 and second image 36.

S46: color correction matrix θ is stored in second Equipment for forming image 14.

S48: when 14 starts of second Equipment for forming image, color correction matrix θ promptly is loaded, and the color that second Equipment for forming image 14 is sensed is promptly done correction according to color correction matrix θ.

See also Fig. 5, Fig. 5 is the generation flow chart of color correction matrix θ in the color correction method of Fig. 4 Equipment for forming image.Below detailed description is applied to the production method of color correction matrix θ in the color correction method of Fig. 4.

S50: produce 39 * 1 first matrix D 1, D2, D3 according to first image 18, each first matrix D 1 of first matrix D 1, D2, D3, D2, D3 are made up of 9 standard color block 20a, 20b, 20c, 20d, 20e, 20f, 20g, the first color-values R of 20h, 20i, G, the B of first image 18 respectively.

S52: by second Equipment for forming image 14 in standard environment down acquisition have 3 each other second color-values R ', G ', B ' respectively about each standard color block 20a ', 20b ', 20c ', 20d ', 20e ', 20f ', 20g ', 20h ', 20i ' among nine standard color block 20a ' of one second image, 36, the second images 36 of standard color card 16,20b ', 20c ', 20d ', 20e ', 20f ', 20g ', 20h ', the 20i '.

S54: produce one 9 * 3 second matrix A according to second image 36, second matrix A is made up of nine standard color block 20a ', 20b ', 20c ', 20d ', 20e ', 20f ', 20g ', the 3 second color-values R ' of 20h ', 20i ', G ', the B ' of second image 36.

S56: calculate one 3 * 3 color correction matrix θ based on first matrix D 1, D2, D3 and second matrix A.

Comprehensively above-mentioned, the color correction method of Equipment for forming image of the present invention can produce a color correction matrix θ in Equipment for forming image, and Equipment for forming image done the auto color correction, so that with the Equipment for forming image of style under identical environment, can have identical color representation to same scene institute picked image.

By the above detailed description of preferred embodiments, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.

Claims (12)

1. color correction equipment, utilize first Equipment for forming image of a process well-corrected to revise the color that is sensed by one second Equipment for forming image, this color correction equipment also is installed in this second Equipment for forming image, one first image about a standard color card is to be captured down in a standard environment by this first Equipment for forming image to form, this standard color card is to have N standard color block, each standard color block in the N of this first image standard color block has M each other first color-values respectively, M and N are respectively a natural number, and this color correction equipment comprises:

One receiver module is in order to receive first image that is transmitted from this first Equipment for forming image;

One first matrix generation module, produce the first matrix D i of M N * 1 according to this first image, each first matrix of this M first matrix is made up of individual first color-values of i of N standard color block of this first image respectively, and wherein, i is the integer index in 1 to the M scope;

One image acquisition module, down acquisition is about one second image of this standard color card in this standard environment, and each the standard color block in the N of this second image standard color block has M respectively other second color-values respectively;

One second matrix generation module produces second matrix A of one N * M according to this second image, and this second matrix is made up of M second color-values of N standard color block of this second image;

One data processing module goes out the color correction matrix Θ of one M * M based on this M first matrix and this second matrix computations;

One storage module is in order to store this color correction matrix; And

One color correcting module, when this second Equipment for forming image start, this color correction module i.e. this color correction matrix of acquisition from this storage module, this color correction module and revise the color that this second Equipment for forming image is sensed according to this color correction matrix.

2. device as claimed in claim 1, wherein this color correction matrix Θ is made up of M row matrix Θ i, and calculates and get via following mathematical expression:

(D _i-A·θ _i) ²＝0

3. device as claimed in claim 1, wherein this M first color-values and this M second color-values all comprises red R, green G, blue B value.

4. device as claimed in claim 1, this M first color-values and this M second color-values all comprises brightness value Y.

5. device as claimed in claim 1, wherein this color correction matrix Θ is one 3 * 3 matrix.

6. device as claimed in claim 1, wherein this first Equipment for forming image is and the identical Equipment for forming image of this second Equipment for forming image.

7. color correction method, utilize first Equipment for forming image of a process well-corrected to revise the color that is sensed by one second Equipment for forming image, one first image about a standard color card is captured down in a standard environment by this first Equipment for forming image and forms, this standard color card has N standard color block, each standard color block in the N of this first image standard color block has M each other first color-values respectively, M and N are respectively a natural number, and this method comprises the following step:

This first image is inputed to this second Equipment for forming image from this first Equipment for forming image;

Produce first matrix of M N * 1 (Di) according to this first image, each first matrix of this M first matrix is made up of individual first color-values of i of N standard color block of this first image respectively, and wherein, i is the integer index in 1 to the M scope;

Down acquisition is about one second image of this standard color card in this standard environment by this second Equipment for forming image, and each the standard color block in the N of this second image standard color block has M respectively other second color-values respectively;

Produce second matrix of one N * M (A) according to this second image, this second matrix is made up of M second color-values of N standard color block of this second image; And

Go out the color correction matrix of one M * M (Θ) based on this first matrix and this second matrix computations.

And

This color correction matrix is stored in this second Equipment for forming image,

Wherein, when this second Equipment for forming image start, this color correction matrix promptly is loaded, and the color that this second Equipment for forming image is sensed is promptly done correction according to this color correction matrix.

8. method as claimed in claim 7, wherein this color correction matrix Θ is made up of M row matrix Θ i, and calculates and get via following mathematical expression:

(D _i-A·θ _i) ²＝0

9. method as claimed in claim 7, wherein this M first color-values and this M second color-values all comprises red R, green G, blue B value.

10. method as claimed in claim 7, this M first color-values and this M second color-values all comprises brightness value Y.

11. method as claimed in claim 7, wherein this color correction matrix Θ is one 3 * 3 matrix.

12. method as claimed in claim 7, wherein this first Equipment for forming image is and the identical Equipment for forming image of this second Equipment for forming image.

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