CN100483483C - Method for building LCD colors characterizing segment and space division model - Google Patents

Method for building LCD colors characterizing segment and space division model Download PDF

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CN100483483C
CN100483483C CNB2007100683501A CN200710068350A CN100483483C CN 100483483 C CN100483483 C CN 100483483C CN B2007100683501 A CNB2007100683501 A CN B2007100683501A CN 200710068350 A CN200710068350 A CN 200710068350A CN 100483483 C CN100483483 C CN 100483483C
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motivation value
passage
value
channel
separation
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CN101042832A (en
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徐海松
张显斗
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Zhejiang University ZJU
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Abstract

This invention discloses one method to establish LCD color property section space module, which comprises the following steps: the module divides the display drive values space into three sub spaces according to the drive value color property and channel interference properties and characterizes the display color according to the sub spaces different property. Through space dividing, it effectively reduces the inconstant quality and independent channel color property accuracy.

Description

A kind of method that makes up LCD colors characterizing segment and space division model
Technical field
The present invention relates to the display device in the modern digital color of image management system, refer in particular to a kind of method that makes up LCD colors characterizing segment and space division model.
Background technology
Along with computing machine and Development of Multimedia Technology, digital image device such as scanner, digital camera, display and color printer have obtained widespread use in commercial production and daily life, but people are when enjoying digital image device and bringing benefit, the puzzlement of distortion when also being subjected to color transmission between distinct device.With (the CEPS of system before the color electric seal, Color Electronic Prepress Systems) the conventional color management system for representative adopts closed-loop fashion that color is managed, open and networked along with color management, this color management for light more and more can not be satisfied the demand.In order to solve the inconsistent problem of different digital vision facilities transmission color, initiated and set up (the ICC of International Color Association in 1993 by companies such as Adobe, Agfa, Apple, Kodak, FOGRA, Microsoft, Silicon Graphics, Sun Microsystem and Taliget, International Color Consortium), it has stipulated an international standard for modern color management for light.The color transmission flow process of this standard as shown in Figure 1, at first generate the colorimetric characterization file of different digital vision facilities, and then by color management module (CMM, Color Management Module) call the color transmission that these colorimetric characterization files are realized equipment rooms, wherein the colorimetric characterization file of equipment be exactly in fact apparatus for establishing motivation value and device independent color space be the corresponding relation in apparatus characteristic description document link space (CIEXYZ or CIELAB).
Digital image device is divided into input equipment, display device and output device, and for example scanner, digital camera belong to input equipment, and display belongs to display device, and printer then belongs to output device.The processing procedure of general piece image is: at first image is transferred on the computer after scanner scanning or digital camera shooting, as required image is done respective handling, direct viewing or by internet transmission or export by printer prints, in whole Digital Image Processing flow process, display is in the Central Terminal Station status, and therefore the colorimetric characterization to display device seems very important.Because LCD obviously is better than traditional cathode-ray tube display at aspects such as power consumption, brightness and volumes, obtains application more and more widely, therefore the accurate colorimetric characterization to LCD seems even more important.
The colorimetric characterization model of conventional cathode ray tube display is based upon the hypothesis display to be satisfied on chromaticity constancy and the channels independence basis, because cathode-ray tube display has had the developing history of decades, manufacturing process is ripe relatively, most of cathode-ray tube display can both satisfy this two assumed conditions, therefore with simple GOG (the Gain Offset Gama) model of the etc.ing good this display of colorimetric characterization of energy just, and the developing history of LCD is shorter, technology also is not very ripe, especially with cathode-ray tube display a great difference is arranged all on luminescence mechanism and the characteristic, most of LCD can't well satisfy channels independence and these two assumed conditions of chromaticity constancy, therefore if simply come this display of colorimetric characterization with models such as GOG, the model prediction ratio of precision is lower.
At present, simple and practical LCD colorimetric characterization model is seldom arranged, some in addition need set up the three dimensional lookup table of liquid crystal display device motivation value RGB and CIE1931XYZ, need a large amount of measurement data, not only time-consuming but also strengthened the storage space of color management for light, can't satisfy the demand.
Summary of the invention
The invention provides a kind of simple, method of needing the structure LCD colors characterizing segment and space division model that training sample is few and precision is high measured.
A kind of method that makes up LCD colors characterizing segment and space division model may further comprise the steps:
(1) colour temperature, the brightness and contrast by LCD is provided with button display is set, make display color temperature, brightness and contrast satisfy user demand, guarantee that simultaneously saturated phenomenon does not appear in the CIE1931XYZ tristimulus values (standard colorimetric observer of CIE 1931 tristimulus values) of corresponding color when the display motivation value is very high;
(2) the chromaticity characteristic of the monochromatic passage of test liquid crystal display, chromaticity coordinates x, y and the z of corresponding color when measuring monochromatic passage different driving value respectively, if what measure is the CIE1931XYZ value, then remove stain (R=G=B=0, R, G and B are respectively the motivation value of redness, green and blue channel) back and obtain its chromaticity coordinates x, y and z by following formula:
x = X X + Y + Z
y = Y X + Y + Z
z＝1-x-y
If measure be Yxy (brightness is Y, and chromaticity coordinates is x, y), then calculates chromaticity coordinates z by following formula:
z＝1-x-y
Find out the relation of the red channel motivation value and the x chromaticity coordinates of correspondence respectively, the relation of the y chromaticity coordinates of green channel motivation value and correspondence, the relation of the z chromaticity coordinates of blue channel motivation value and correspondence;
(3) the interchannel interference characteristic of test liquid crystal display, measure monochromatic passage (motivation value of other two passages is zero) and color mixture passage (other two channels drive values are maximal value) CIE1931XYZ value of corresponding color under this passage different driving value of each passage correspondence respectively, if that measure is Yxy, calculate corresponding X, Y and Z value by following formula:
X = x y × Y
Y＝Y
Z = 1 - x - y y × Y
The monochromatic passage of each passage correspondence of drawing and the tone reproduction curve of color mixture passage, concrete red channel is the function curve of normalization X and normalization red channel motivation value, green channel is the function curve of normalization Y and normalization green channel motivation value, and blue channel is the function curve of normalization Z and normalization blue channel motivation value.Find out the disturbed condition that each passage is subjected to two other passage;
(4) according to chromaticity characteristic and interchannel interference characteristic under each passage different driving value, the motivation value of each passage is divided into three sections, two separations of red channel are designated as (M R, N R), green channel is designated as (M G, N G), blue channel is designated as (M B, N B);
(5) represent that with quadratic polynomial X, Y and Z tristimulus values are with the relation of this passage normalization motivation value in this is interval in each piecewise interval of monochromatic passage respectively, as being example with the red channel, tristimulus values can be expressed as
T Ri = a 1 i + b 1 i &times; r + c 1 i &times; r 2 R < = M R T Ri = a 2 i + b 2 i &times; r + c 2 i &times; r 2 M R < R < = N R T Ri = a 3 i + b 3 i &times; r + c 3 i &times; r 2 R > N R (i is X, Y or Z)
In the formula, r is the normalization motivation value of red channel, T Ri(i is X, Y or Z) is the tristimulus values of red channel corresponding color, a Ji, b JiAnd c Ji(j=1,2,3) are constant, M RAnd N RBe respectively in red channel motivation value low separation and in high separation, determine by the chromaticity permanent character and the passage autonomous behavior of display;
Also do same processing for green and blue channel;
(6) by 6 separations of three passages, whole motivation value space is divided into 27 sub spaces,, more above-mentioned 27 sub spaces is divided three classes according to interchannel interference characteristic:
A. has only a separation M in the motivation value of three passages at most, totally 7 sub spaces greater than respective channel;
B., two motivation value M greater than respective channel, totally 12 sub spaces are arranged in the motivation value of three passages;
C. the motivation value of three passages is all greater than the motivation value M of respective channel, totally 8 sub spaces;
The tristimulus values of corresponding color when (7) calculating motivation value respectively and be positioned at three space-likes:
When the motivation value of three passages is positioned at a space-like, do not consider interchannel interference, after the direct addition of tristimulus values that each motivation value respective channel piecewise function is tried to achieve, the tristimulus values of adding the stain correspondence promptly gets the tristimulus values of color mixture passage corresponding color, for example is arranged in the R＜=M of 7 sub spaces when three channels drive values of color mixture R, G＜=M G, B＜=M BDuring the subspace, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi
T wherein BlackBe the tristimulus values of stain, T Ri, T GiAnd T BiBe respectively the tristimulus values of redness, green and blue channel motivation value corresponding segments function.Same processing is also done in other a class subspace;
When the motivation value of three passages is positioned at the b space-like, except that the tristimulus values that a space-like obtains, also need consider two the interchannel interference of motivation value greater than corresponding separation M, for example be arranged in the M of 12 sub spaces when three channels drive values of color mixture R＜R＜=N R, M G＜G＜=N G, B＜=M RDuring the subspace, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi+d i+e i×r×g
Wherein r and g are respectively the normalization motivation value of red and green channel, and two of back are distracter, d iAnd e iBe constant, can come match to determine by the training sample of this subspace.Same processing is also done in other b class subspace;
When three channels drive values are positioned at the c space-like, except that the tristimulus values that a space-like obtains, also need consider three interchannel interference, for example be arranged in the M of 8 sub spaces when three channels drive values of color mixture R＜R＜=N R, M G＜G＜=N G, M B＜B＜=N BDuring the subspace, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi+d i+e i×r×g+f i×g×b+h i×r×b+k i×r×g×b
Wherein b is the normalization motivation value of blue channel, and five of back are distracter, d i, e i, f i, h iAnd k iBe constant, can determine by the training sample match of this subspace.Same processing is also done in other c class subspace;
(8) according to IEC 61966-4 standard experimental provision is set, obtains to comprise the training sample of following three data set:
First data acquisition is: (R, G, B)=(I R, 0,0), (R, G, B)=(0, I G, 0), (R, G, B)=(0,0, I B), the I of red channel wherein R=M R/ 3,2 * M R/ 3, M R, M R+ (N R-M R)/3, M R+ 2 * (N R-M R)/3, N R, N R+ (R Max-N R)/3, N R+ 2 * (R Max-N R)/3 and R Max, R wherein MaxMaximum drive value for red channel.Blueness and green channel I GAnd I BFollow the example of and be similar to red channel, this data acquisition has 27 training samples;
Second data set is: (R, G, B)=(J R, J G, M B/ 2), (R, G, B)=(J R, M G/ 2, J B), (R, G, B)=(M R/ 2, J G, J B), J wherein RBe M R, N RAnd R Max, J GBe M G, N GAnd G Max, J BBe M B, N BAnd B Max, G wherein MaxAnd B MaxBe respectively the maximum drive value of green and blue channel, this data acquisition has 27 sample combinations;
The 3rd data set is: (R, G, B)=(L R, I G, L B), L wherein RBe M R, N RAnd R Max, I GBe M G, N GAnd G Max, L BBe M B, N BAnd B Max, have 27 sample combinations;
If the motivation value that calculates is a decimal, then round nearby in above-mentioned three data set.The data acquisition of above-mentioned all measurements is carried out the stain removal, divide the training sample of spatial model as segmentation.Wherein the training sample that obtains of first data acquisition is used for the match of piecewise function coefficient, second data gathered the match that the training sample that obtains is used for b space-like distracter coefficient, and the 3rd data are gathered the match that the training sample that obtains is used for c space-like distracter coefficient;
The training sample that above-mentioned three data set can also be non-constant according to the chromaticity of display in different piecewise intervals or the space, passage interference characteristic and interval or space size are evenly chosen proper number, and the training sample on the separation is used for two piecewise functions adjacent with it or the coefficient match of two space equations, so both can utilize training sample efficiently, near the tristimulus values separation is kept continuously;
(9) utilize least square method, with each piecewise function that obtains in the step (8) and the training sample in the subspace respectively to its corresponding segments function and subspace distracter coefficient match (wherein the training sample on the separation is used for two piecewise functions adjacent with it or the coefficient match of two space equations), obtain the corresponding relation of display normalization motivation value r, g, b and CIE1931XYZ tristimulus values in each sub spaces, finish the colorimetric characterization of display.
The present invention has effectively weakened the non-constant and not independent influence to LCD colorimetric characterization precision of passage of chromaticity by the motivation value space dividing, has improved the model prediction precision.The present invention chooses separation as training sample as far as possible in addition, and be in the match that training sample on the separation is used for adjacent with it two piecewise functions or subspace function coefficients, so not only utilized training sample efficiently but also increased near the continuity of model prediction tristimulus values separation.The present invention has realized the accurate colorimetric characterization to LCD under the few situation of number of training.
Description of drawings
Fig. 1 is modern color management for light color transmission process flow diagram;
Fig. 2 is the variation relation figure of LCD three chrominance channel chromaticity coordinatess of the present invention with motivation value;
Fig. 3 for the present invention green and blue channel to the graph of a relation that influences of red channel tone reproduction curve;
Fig. 4 divides the Experimental equipment of spatial model for segmentation of the present invention.
Embodiment
With the digitizing motivation value is that a LCD of 8 is an example, and the segmentation of this display of colorimetric characterization divides spatial model may further comprise the steps:
(1) by colour temperature the colour temperature that button is provided with LCD is set, make colour temperature satisfy user demand, by the brightness and contrast button is set LCD brightness and contrast are satisfied the demands, guarantee that simultaneously saturated phenomenon does not appear in the CIE1931XYZ tristimulus values of corresponding color when the display motivation value is very high;
(2) the chromaticity characteristic of the monochromatic passage of test liquid crystal display, do not measure redness, green and blue channel motivation value respectively in the CIE1931XYZ value of 16,32,48,64,80,96,112,128,144,160,176,192,208,224,240 and 255 times corresponding color with PR-650 spectral radiant emittance score, remove stain (R=G=B=0, R, G and B are respectively the motivation value of redness, green and blue channel) back and obtain its chromaticity coordinates x, y and z by following formula:
x = X X + Y + Z
y = Y X + Y + Z
z＝1-x-y
Find out the relation of the red channel motivation value and the x chromaticity coordinates of correspondence respectively, the relation of the y chromaticity coordinates of green channel motivation value and correspondence, the relation of the z chromaticity coordinates of blue channel motivation value and correspondence, as shown in Figure 2;
(3) the interchannel interference characteristic of test liquid crystal display is not measured monochromatic passage (motivation value of two other passage is zero) and color mixture passage (motivation value of two other passage is a maximal value) CIE1931XYZ value of corresponding color under the different driving value of each passage correspondence with PR-650 spectral radiant emittance score.The tristimulus values of three monochromatic passage corresponding color obtains in step (2), and needing the motivation value of the color mixture passage correspondence of measurement is (H R, 255,255), (255, H G, 255) and (255,255, H B), H wherein R, H GAnd H BAll be 16,32,48,64,80,96,112,128,144,160,176,192,208,224,240 and 255.
The tone reproduction curve of the monochromatic passage of each passage correspondence of drawing and color mixture passage correspondence, concrete red channel is the relation of normalization X and normalization red channel motivation value, green channel is the relation of normalization Y and normalization green channel motivation value, and blue channel is the relation of normalization Z and normalization blue channel motivation value.Find out the disturbed condition that each passage is subjected to other two passages, Figure 3 shows that red channel is subjected to the disturbed condition of green and blue two passages;
(4) according to chromaticity characteristic and interchannel interference characteristic under each passage different driving value, the motivation value of each passage is divided into three sections, two separations of red, green and blue channel all get 64 and 128 respectively.
(5) use interior X, Y of monochromatic each piecewise interval of passage of quadratic polynomial match and the Z tristimulus values relation with this passage normalization motivation value in this is interval respectively, as being example with the red channel, tristimulus values can be expressed as
T Ri = a 1 i + b 1 i &times; r + c 1 i &times; r 2 R < = 64 T Ri = a 2 i + b 2 i &times; r + c 2 i &times; r 2 64 < R < = 128 T Ri = a 3 i + b 3 i &times; r + c 3 i &times; r 2 R > 128 (i is X, Y or Z)
In the formula, r is the normalization motivation value of red channel, T Ri(i is X, Y or Z) is tristimulus values, a Ji, b JiAnd c Ji(j=1,2,3) are constant;
Also do same processing for green and blue channel;
(6) 6 separations by three passages are 27 sub spaces with whole motivation value spatial division, and according to interchannel interference characteristic, this 27 sub spaces are divided three classes again:
A. has only one in the motivation value of three passages at most greater than 64, totally 7 sub spaces;
B. there are two in the motivation value of three passages greater than 64, totally 12 sub spaces;
C. the motivation value of three passages is all greater than 64, totally 8 sub spaces;
The tristimulus values of correspondence when (7) calculating motivation value respectively and be positioned at three space-likes:
When the motivation value of three passages is positioned at a space-like, do not consider interchannel interference, after the direct addition of tristimulus values that each motivation value respective channel piecewise function is tried to achieve, the tristimulus values of adding the stain correspondence promptly gets the tristimulus values of color mixture passage, for example when three channels drive values of color mixture were arranged in R＜=64, G＜=64, B of 7 sub spaces＜=64 subspaces, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi
T wherein BlackBe the tristimulus values of stain, T Ri, T GiAnd T BiBe respectively the tristimulus values of redness, green and blue channel motivation value corresponding segments function.Same processing is also done in other a class subspace;
When the motivation value of three passages is positioned at the b space-like, except that the tristimulus values that a space-like obtains, need consider that also motivation value is greater than two interchannel interference of 64, for example when the motivation value of three passages of color mixture was arranged in 64＜R＜=128,64＜G＜=128, B of 12 sub spaces＜=64 subspaces, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi+d i+e i×r×g
Wherein r and g are respectively the normalization motivation value of red and green channel, and two of back are distracter, d iAnd e iBe constant, can come match to determine by the training sample of this subspace.Same processing is also done in other b class subspace;
When three channels drive values are positioned at the c space-like, except that the tristimulus values that a space-like obtains, also need consider three interchannel interference, for example when the motivation value of three passages of color mixture was arranged in 64＜R＜=128,64＜G＜=128,64＜B of 8 sub spaces＜=128 subspaces, the tristimulus values of its corresponding color can be expressed as
T i＝T Black+T Ri+T Gi+T Bi+d i+e i×r×g+f i×g×b+h i×r×b+k i×r×g×b
Wherein b is the normalization motivation value of blue channel, and five of back are distracter, d i, e i, f i, h iAnd k iBe constant, can determine by the training sample match of this subspace.Same processing is also done in other c class subspace;
(8) experimentize, its experimental provision as shown in Figure 4, the screen significant height is h, the distance between screen and the surveying instrument is 4h, color lump size to be measured is h/5 * h/5, and color lump to be measured is presented at the screen centre, other zone of screen is set to black;
With PR-650 spectral radiant emittance instrumentation amount training sample, training sample comprises following three data set:
First data acquisition is: (R, G, B)=(I R, 0,0), (R, G, B)=(0, I G, 0), (R, G, B)=(0,0, I B).With the red channel is example, wherein I RBe 21,43,64,85,107,128,170,213 and 255.Wherein (21,0,0), (43,0,0) and (64,0,0) are used for T Ri=a Li+ b Li* r+c Li* r 2The fitting of a polynomial of (R＜=64), (64,0,0), (85,0,0), (107,0,0) and (128,0,0) are used for T Ri=a 2i+ b 2i* r+c 2i* r 2The fitting of a polynomial of (64＜R＜=128), (128,0,0), (170,0,0), (213,0,0) and (255,0,0) are used for T Ri=a 3i+ b 3i* r+c 3i* r 2The fitting of a polynomial of (R〉128).Blueness and green channel I GAnd I BFollow the example of and usage is similar to red channel.This data acquisition has 27 training samples;
Second data set is: (R, G, B)=(J R, J G, 32), (R, G, B)=(J R, 32, J B), (R, G, B)=(32, J G, J B), J wherein R, J GAnd J BAll be that 64,128 or 255, three set have 27 training samples, be used for the data fitting of b space-like distracter, make each subspace that 4 training samples all be arranged.For example the training sample of 64＜R＜=128,64＜G＜=128 and B＜=64 subspaces is (64,64,32), (64,128,32), (128,64,32) and (128,128,32), the training sample of other 11 sub spaces is followed the example of and is similar to 64＜R＜=128,64＜G＜=128, B＜=64 subspaces;
The 3rd data set is: (R, G, B)=(L R, L G, L B), L wherein R, L GAnd L BBe 64,128 or 255 all, have 27 sample combinations, be used for the data fitting of c space-like distracter, make each subspace that 8 training samples be arranged.64＜R＜=128,64＜G＜=128 and 64＜B＜=128 subspaces for example, its training sample is (64,64,64), (64,64,128), (64,128,64), (64,128,128), (128,64,64), (128,64,128), (128,128,64) and (128,128,128).Following the example of of other 7 sub spaces is similar to 64＜R＜=128,64＜G＜=128,64＜B＜=128 subspaces;
Wherein above-mentioned data acquisition could be as training sample after must removing through stain;
(9) utilize least square method, with each piecewise function that obtains in the step (8) and the training sample in the subspace respectively to its corresponding segments function and subspace distracter coefficient match (wherein the training sample on the separation is used for two piecewise functions adjacent with it or the coefficient match of two space equations), obtain the corresponding relation of display normalization motivation value r, g, b and CIE1931XYZ tristimulus values in each sub spaces, finish the colorimetric characterization of display.

Claims (1)

1. method that makes up LCD colors characterizing segment and space division model is characterized in that may further comprise the steps:
(1) colour temperature, the brightness and contrast by LCD is provided with button display is set, make display color temperature, brightness and contrast satisfy user demand, guarantee that simultaneously saturated phenomenon does not appear in display CIE1931XYZ tristimulus values of corresponding color when motivation value is very high;
(2) the chromaticity characteristic of test liquid crystal display redness, green, blue channel, chromaticity coordinates x, y and the z of corresponding color when measuring each passage different driving value respectively, find out the relation of the x chromaticity coordinates of red channel motivation value and correspondence, the relation of the y chromaticity coordinates of green channel motivation value and correspondence, the relation of the z chromaticity coordinates of blue channel motivation value and correspondence;
(3) the interchannel interference characteristic of test liquid crystal display, the CIE1931XYZ value of the color mixture passage corresponding color under this passage different driving value when the monochromatic passage the when motivation value of measuring other two passages of each passage correspondence respectively is zero and other two channels drive values are maximal value, the monochromatic passage of each passage correspondence of drawing and the tone reproduction curve of color mixture passage are found out the disturbed condition that each passage is subjected to two other passage;
(4) according to chromaticity characteristic and interchannel interference characteristic under each passage different driving value, the motivation value of each passage is divided into three sections, two separations of red channel are designated as M R, N R, two separations of green channel are designated as M G, N G, two separations of blue channel are designated as M B, N B, M wherein RAnd N RBe respectively in red channel motivation value low separation and in high separation, M GAnd N GBe respectively in green channel motivation value low separation and in high separation, M BAnd N BBe respectively in blue channel motivation value low separation and in high separation;
(5) represent that with quadratic polynomial X, Y and Z tristimulus values are with the relation of this passage normalization motivation value r, g, b in this interval in each piecewise interval of monochromatic passage respectively;
(6) by 6 separations of described three passages of step (4), be 27 sub spaces,, more above-mentioned 27 sub spaces be divided three classes according to interchannel interference characteristic with whole motivation value spatial division:
A. has only a separation M in the motivation value of three passages at most, totally 7 sub spaces greater than respective channel;
B., two separation M greater than respective channel are arranged, totally 12 sub spaces in the motivation value of three passages;
C. the motivation value of three passages is all greater than the separation M of respective channel, totally 8 sub spaces;
Described separation M is the low middle separation of each passage;
The tristimulus values of corresponding color when (7) calculating motivation value respectively and be positioned at three space-likes, when the motivation value of three passages is positioned at a space-like, need not to consider interchannel interference, after the tristimulus values addition that each motivation value respective channel piecewise function is tried to achieve, the tristimulus values of adding the stain correspondence promptly gets the tristimulus values of color mixture passage corresponding color; When the motivation value of three passages is positioned at the b space-like, except that the tristimulus values that a space-like obtains, also need consider two the interchannel interference of motivation value greater than corresponding separation M; When three channels drive values are positioned at the c space-like, except that the tristimulus values that a space-like obtains, also need consider three interchannel interference;
(8) according to IEC 61966-4 standard experimental provision is set, choosing the color of the motivation value correspondence in separation and even division piecewise interval or space measures, and the tristimulus values that measures is carried out stain remove, divide the training sample of spatial model as segmentation;
(9) utilize least square method, with each piecewise function that obtains in the step (8) and the training sample in the subspace respectively to its corresponding segments function and subspace distracter coefficient match, obtain the corresponding relation of display normalization motivation value r, g, b and CIE1931XYZ tristimulus values in each sub spaces, finish the colorimetric characterization of display.
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