CN101188096A - A LCD color domain mapping algorithm and color management system - Google Patents
A LCD color domain mapping algorithm and color management system Download PDFInfo
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- CN101188096A CN101188096A CNA2007101725145A CN200710172514A CN101188096A CN 101188096 A CN101188096 A CN 101188096A CN A2007101725145 A CNA2007101725145 A CN A2007101725145A CN 200710172514 A CN200710172514 A CN 200710172514A CN 101188096 A CN101188096 A CN 101188096A
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Abstract
The invention provides a color management system for liquid crystal displays, which comprises a LCD screen test unit, a positive color gamut mapping unit, a color switching unit, a cross-border processing unit and a reverse color gamut mapping unit. Aiming at the fixtures of the color gamut of a liquid crystal display, the invention provides a method and a fragment simulation algorithm which can clearly describe the mapping model of such kind of equipment between the color gamut of the equipment relative color space and the color gamut of the equipment irrelative color space, thereby effectively improving the accuracy of the color management system in such kind of display equipment; so that the same feeling of colors can be felt from liquid crystal televisions and liquid crystal monitors, which have different photoelectric and color properties.
Description
Technical field
The present invention relates to the disposal route and the system of color signal, more specifically, the present invention is a kind of gamut mapping algorithm and color management for light of LCD.
Background technology
Follow display device with rapid changepl. never-ending changes and improvements to occur, the user usually finds that an identical picture (such as LCD, CRT, PDP, printer etc.) on various display devices can obtain different chromatic renditions, and which is hard to tell is the original color of image.Reason is in digitized image, although the color correspondence of each pixel unique digital color value array, but this group color-values during by different device rendered come out (the beam bombardment display screen of for example digital camera sensitization, CRT, the polarized light of LCD pass through optical filter) all can only simulate, the characteristic of color and equipment is closely related, and therefore the color that shows is different.
Because color has device dependency, if between input (shooting) and demonstration (computer screen) equipment, show (for example LCD) and show to obtain identical or similar color impression between (for example PDP) equipment, just need to introduce effective Color Management Mechanism.Color management is based upon on the basis of color space, and color space is a kind of model of numerically representing color with multidimensional coordinate.Mainly contain device dependent color spaces and device independent color space two classes at present.
Device-dependent color space: describe the color summation and the regularity of distribution of concrete vision facilities, for example linear RGB color space and CMYK color space etc. with device-dependent coordinate.At device-dependent color space, the variation of coordinate axis parameter can not directly cause the respective change of perceived color.
Device-independent color space: use the color space of describing the equipment color characteristic with device-independent coordinate.The CIEXYZ color space formulated of ISO (International Standards Organization) for example.At device-independent color space, the variation of coordinate axis parameter can directly cause the respective change of perceived color.
Characteristic according to device-independent color space, want to portray and compare the characteristic of color, we need be with describing color with device-independent color coordinates, promptly color is described as standard and intermediary color space with device independent color space and compares.Color management is in order to obtain the desired color effect, describes a kind of color with object from current color space (R
1, G
1, B
1) be transformed into the color space (R of output device
2, G
2, B
2) technology or system.
As shown in Figure 1, a kind of method of color management is, color coordinates slave unit dependent color spaces (for example rgb space) with device A is transformed into device-independent color space (for example XYZ space) earlier, again color is handled, again color coordinates is transformed into the relevant color space (for example rgb space) of equipment B from the device independent color space of relaying afterwards and shows and observe.
Wherein, Color Gamut Mapping is that color with object is transformed into another kind of color space from a kind of color space; For example the forward Color Gamut Mapping be with the color slave unit dependent color spaces of object (R, G, B) the irrelevant color space of conversion equipment (X, Y, Z); And reverse Color Gamut Mapping is its inverse process, be the irrelevant color space of color slave unit (X, Y, Z) change back again device dependent color spaces (R, G, B).
Color management for light as shown in Figure 1, it comprises display A, forward Color Gamut Mapping, color adjustment, reverse Color Gamut Mapping, display B, input signal (R
1, G
1, B
1) be converted to output signal (R through this system
2, G
2, B
2).As can be seen from Figure 1, forward Color Gamut Mapping part and reverse Color Gamut Mapping partly are the key components in the color management for light, and its accuracy and accuracy directly have influence on the accuracy and the accuracy of whole color management for light.Application number be 03110565.3 Chinese patent " system and method for color management is provided " and application number be 200580008516.X Chinese patent " color management for light and method " in, provided similar color management method system chart respectively.But the method simulation that they all use three LUT look-up tables and one 's 3 * 3 transformation matrix to match in Color Gamut Mapping part, promptly as shown in the formula (is example with the forward Color Gamut Mapping) described:
r
1＝LUT(R
1)，g
1＝LUT(G
1)，b
1＝LUT(B
1)
This modeling method the experiment proved that it is effectively, but its degree of accuracy is but along with R
1, G
1, B
1In peaked reducing and reducing, especially the Gamma curve distribution of these type of three kinds of colors of LCD monitor (LCD monitor) is changed big display device, when GTG less than 100 the time, the array (X that generates by analog computation
1, Y
1, Z
1) value and actual measurement (X
0, Y
0, Z
0) error of value significantly rises, and can not satisfy the requirement of the display device manufacturer that color management mechanism is provided.
In order to remedy the error of linear matrix product, there is the correlation technique document to remove to simulate non-linear Color Gamut Mapping model with the high level matrix that surpasses single order, be shown below.This modeling method has raising to the mapping model accuracy, but it does not have physical basis, goes to approach from mathematics match aspect purely, not only each D
I, jFinding the solution of matrix is more loaded down with trivial details, and matrix D
I, jExistence also can not get guaranteeing.
Therefore, how to provide the modeling algorithm of Color Gamut Mapping unit in a kind of accurate disposal system, become the technical matters that industry needs to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of color management algorithm and system of LCD,, thereby generate the controlled liquid crystal display color performance of sense organ expection with the simulation of color model that liquid crystal display accurately is provided.
For achieving the above object, the invention provides a kind of gamut mapping algorithm of LCD, the color management for light that is used for LCD, it is characterized in that, described algorithm is by the model of piecewise linearity matrix product, cooperate four one dimension look-up tables and two ratio mapping functions, in order to the Nonlinear Mapping model of the colour gamut of simulated solution crystal display, described method specifically may further comprise the steps:
Step 2, the monochrome information and the chrominance information of test and record R, G, B monochrome from 0 to 255, i.e. (X respectively
r, Y
r, Z
r) r=0,1 ..., 255; (X
g, Y
g, Z
g) g=0,1 ..., 255; (X
b, Y
b, Z
b) b=0,1 ..., 255;
Step 3, according to accuracy requirement, every n rank GTG, from the record choose one group of (X
w, Y
w, Z
w), (X
r, Y
r, Z
r), (X
g, Y
g, Z
g), (X
b, Y
b, Z
b) value, calculate one 3 * 3 matrix M r2x, thereby calculate m=256/n matrix;
Step 4, according to Y
w, Y
r, Y
g, Y
bGenerate the look-up table Wlut of four one dimensions, Rlut, Glut, Blut;
Step 5, the original liquid crystal display pixel color value (R of input
1, G
1, B
1), earlier according to three look-up table Rlut, Glut, Blut calculate tristimulus values (r
1, g
1, b
1), again according to GTG interval selection algorithm, select the GTG interval that it belongs to, and take out the Mr2x of this interval mapping matrix of representative that step 3 calculates
iI ∈ 1,2 ..., m};
Step 6, according to the GTG interval of step 5 correspondence, to tristimulus values (r
1, g
1, b
1) carry out ratio mapping, i.e. (r
1', g
1', b
1')=f
Simu[gy, (r
1, g
1, b
1)];
Step 7, the linear transformation of calculating colour gamut are with the tristimulus values after the mapping and this interval mapping matrix multiple, i.e. (X of selecting for use
1', Y
1', Z
1') '=Mr2x
i* (r
1', g
1', b
1') ';
Step 8, still according to the pairing GTG gy of step 6, to the device independent coordinate (X that generates
1', Y
1', Z
1'), carry out the ratio mapping second time, obtain required device independent coordinate (X
1, Y
1, Z
1), i.e. (X
1, Y
1, Z
1)=f
Lum[(X
1', Y
1', Z
1'), gy].
Above-mentioned steps 1 comprises that further control-signals generator sends white point signal step by step, tests and write down the colourity and the monochrome information of 256 grades of GTGs of liquid crystal display to be measured by the color analysis instrument.
Above-mentioned steps 2 comprises that further control-signals generator sends monochrome signal step by step, tests and write down the colourity and the monochrome information on 256 grades of monochromatic rank of liquid crystal display to be measured by the color analysis instrument.
The present invention further provides a kind of color management for light of LCD on the Color Gamut Mapping model based of accurate simulated solution crystal display, it comprises:
Original lcd panel test unit, this unit testing is also write down the brightness and the chrominance information of the GTG passage of original LCDs, and it links to each other with forward Color Gamut Mapping unit;
Forward Color Gamut Mapping unit is to be mapped to device-independent color space to the relevant color space of the color value slave unit of object pixel;
Color converting unit is to provide the change of color coordinates in device-independent color space;
The processing unit that crosses the border, handling in device-independent color space, the color coordinates when the colour gamut of the colour gamut of original device and target device is unequal;
Reverse Color Gamut Mapping unit is used for the irrelevant color space of color of pixel value slave unit is mapped to the relevant color space of target device;
Target lcd panel test unit, the brightness and the chrominance information of the GTG passage of this unit testing and record object LCDs, it links to each other with reverse Color Gamut Mapping unit.
The color management for light of above-mentioned LCD, this forward Color Gamut Mapping unit further comprises Lut positive-going transition module, thereby by the digital actuation value (R that imports
1, G
1, B
1) obtain tristimulus values (r
1, g
1, b
1); Segmentation positive-going transition matrix generation module, chromatic value and brightness value according in the record calculate matrix M r2x; GTG interval selection module is by the digital actuation value (R of input
1, G
1, B
1) and GTG interval selection algorithm, select the GTG interval that it belongs to; The transformation of scale module according to the result of this GTG interval selection module, provides the ratio mapping; The positive mapping block of colour gamut, the transform matrix M r2x that obtains from GTG interval selection module
iWith the tristimulus values (r after the ratio variation
1', g
1', b
1') product obtain device independent coordinate (X
1', Y
1', Z
1').
The color management for light of above-mentioned LCD, this forward Color Gamut Mapping unit further comprises the look-up table generation module, generates look-up table Wlut, Rlut, Glut and the Blut of four one dimensions according to white point, redness, green and 256 grades of blue brightness datas.
The color management for light of above-mentioned LCD, this transformation of scale module comprises the first transformation of scale module, according to the result of this GTG interval selection module, provides ratio mapping for the first time; And the second transformation of scale module, behind the positive mapping block of colour gamut, provide secondary mapping.
The color management for light of above-mentioned LCD, this reverse Color Gamut Mapping unit further comprises: segmentation reciprocal transformation matrix generation module, according to accuracy requirement, every several GTGs, chromatic value and brightness value according in the record calculate an inverse-transform matrix Mx2r; The transformation of scale module provides the ratio mapping according to GTG interval selection module result; Colour gamut inverse mapping module, the phase transformation matrix M x2r that obtains from GTG interval selection module
iWith the device independent coordinate (X after the transformation of scale
2', Y
2', Z
2') tristimulus values (r that multiplies each other and obtain the target device dependent color spaces
2', g
2', b
2'); The Lut inverse transform module obtains the output rgb value of target liquid crystal display.
The color management for light of above-mentioned LCD, this reverse Color Gamut Mapping unit further comprises the look-up table generation module of target liquid crystal display.
The color management for light of above-mentioned LCD, the transformation of scale module of this reverse Color Gamut Mapping unit comprises the first transformation of scale module, according to the result of this GTG interval selection module, provides ratio mapping for the first time, and the second transformation of scale module, so that secondary mapping to be provided.
Compared with prior art, the color management algorithm and the system of LCD of the present invention, at the LCD monitor with different photoelectric characteristics and color display characteristic (LCD monitor), LCD TV display devices such as (LCDTV), the method of the Color Gamut Mapping model of accurate this type of display device of description---dividual simulation algorithm is provided, has promptly increased the accuracy of color management process; And provide a kind of execution color management for light of LCD efficiently.
Description of drawings
The gamut mapping algorithm of a kind of LCD of the present invention and color management for light are provided by following embodiment and accompanying drawing.
Fig. 1 is the color management schematic flow sheet of traditional LCD;
Fig. 2 is a kind of device independent color space synoptic diagram of LCD;
Fig. 3 is the The general frame of the color management for light of a kind of LCD of the present invention;
Fig. 4 is the signal Processing synoptic diagram of the forward Color Gamut Mapping unit in the color management for light of LCD of the present invention;
Fig. 5 is the signal Processing synoptic diagram of the reverse Color Gamut Mapping unit in the color management for light of LCD of the present invention;
Fig. 6 is the structural representation of a preferred embodiment of the color management for light of LCD of the present invention.
Embodiment
Below will the gamut mapping algorithm and the color management for light of a kind of LCD of the present invention be described in further detail.
The colour gamut of LCD depends on the emission spectrum of light source, the transmitted spectrum of liquid crystal panel, color filter film (CF) and polaroid etc., the color model of a complexity of formation.The Color Gamut Mapping method of a kind of LCD provided by the invention---dividual simulation algorithm, promptly the model of piecewise linearity matrix product cooperates four one dimension look-up tables and two ratio mapping functions, and it may further comprise the steps:
Step a, control-signals generator and color analysis instrument are to the brightness of white point step by step and the chrominance information (X of liquid crystal display to be measured
w, Y
w, Z
w) w=0,1 ..., 255 test and record;
Step b, adopt with the identical method of step a, respectively test and record R, G, B monochrome (R=0 for example, 1 ..., 255; G=B=0) from 0 to 255 monochrome information and chrominance information, i.e. (X
r, Y
r, Z
r) r=0,1 ..., 255; (X
g, Y
g, Z
g) g=0,1 ..., 255; (X
b, Y
b, Z
b) b=0,1 ..., 255;
Step c, according to accuracy requirement, every n rank GTG, from the record choose one group of (X
w, Y
w, Z
w), (X
r, Y
r, Z
r), (X
g, Y
g, Z
g), (X
b, Y
b, Z
b) value, calculate one 3 * 3 matrix M r2x, thereby calculate altogether approximately
Individual matrix;
Steps d, according to Y
w, Y
r, Y
g, Y
bGenerate the look-up table Wlut of four one dimensions, Rlut, Glut, Blut;
Step e, the original liquid crystal display pixel corresponding color value (R of input
1, G
1, B
1), earlier according to three look-up table Rlut, Glut, Blut calculate tristimulus values (r
1, g
1, b
1), again according to GTG interval selection algorithm, select the GTG interval that it belongs to, and take out the Mr2x of this computation interval transformation matrix of representative that step c calculates
iI ∈ 1,2 ..., m};
Step f, according to this Mr2x
iPairing GTG gy (Mr2x for example
1Pairing GTG gy is 255) to tristimulus values (r
1, g
1, b
1) carry out ratio mapping, i.e. (r
1', g
1', b
1')=f
Simu[gy, (r
1, g
1, b
1)];
Step g, the linear transformation of calculating colour gamut are with the tristimulus values after the ratio mapping and this interval mapping matrix multiple, the i.e. (X that selects for use
1', Y
1', Z
1') '=Mr2x
i* (r
1', g
1', b
1') ';
Step h, still according to the pairing GTG gy of step f, to the device independent coordinate (X that generates
1', Y
1', Z
1'), carry out the ratio mapping second time, obtain required device independent coordinate (X
1, Y
1, Z
1), i.e. (X
1, Y
1, Z
1)=f
Lum[(X
1', Y
1', Z
1'), gy].
It should be noted that reverse Color Gamut Mapping adopts essentially identical algorithm mechanism, its execution in step is the reverse order process of above recitation of steps, and need test and calculate four one dimension look-up tables again, recomputates segmented conversion inverse matrix etc.
As shown in Figure 2, be a kind of device independent color space signal of LCD, ordinate is Y, represents luminance component.Two horizontal coordinates are respectively x and y, represent the color component in the CIEXYZ color space respectively, directly by (Z) linear transformation generates for X, Y, so CIEXYZ space and CIEYxy space have equal meaning.Empirical tests, this color space model has been represented the color characteristics of most of LCD and LCD TV.
As shown in Figure 3, patent of the present invention provides a LCD color management for light framework accurately simulating on the Color Gamut Mapping model based.The color management for light of this LCD comprises: original lcd panel test unit 10, forward Color Gamut Mapping unit 20, color converting unit 30, the processing unit 40 that crosses the border, reverse Color Gamut Mapping unit 50 and target lcd panel test unit 60.
This original and target lcd panel test unit 10,60 is used to test and write down the monochrome information and the chrominance information of GTG white point, redness, green and the blue channel of original LCDs and target liquid crystal display.
And target lcd panel test unit 10 original with this, this forward Color Gamut Mapping unit 20 is connected, and is used for the relevant color space rgb space of the color value slave unit of object pixel is mapped to device-independent CIEXYZ color space.
This color converting unit 30 is connected with this forward Color Gamut Mapping unit 20, with in device-independent color space CIEXYZ, provides the change of color coordinates, and for example colour gamut convergent-divergent, color distribution change etc. is from (X
1, Y
1, Z
1) generation (X
2, Y
2, Z
2).
This processing unit 40 that crosses the border is connected with this color converting unit 30, its use that matches with this reverse Color Gamut Mapping unit 50, processing in device-independent color space, the color coordinates when the colour gamut unequal (being the situation that some color can only present on a kind of equipment) of the colour gamut of original device and target device.
This reverse Color Gamut Mapping unit 50 is used for the irrelevant color space CIEXYZ spatial mappings of color of pixel value slave unit is arrived the relevant RGB color space of target device, to show in target device.
As shown in Figure 4, this forward Color Gamut Mapping unit 20 specifically comprises: look-up table generation module 201, Lut positive-going transition module 202, segmentation positive-going transition matrix generation module 203, GTG interval selection module 204, the first transformation of scale module 205, positive mapping block 206, the second transformation of scale modules 207 of colour gamut.
This look-up table generation module 201 is connected with this original lcd panel test unit 10, generates look-up table Wlut, Rlut, Glut and the Blut of four one dimensions according to white point, redness, green and 256 grades of blue brightness datas.
This Lut positive-going transition module 202 is connected with this look-up table generation module 201, according to this look-up table generation module 201, by the digital actuation value (R of input
1, G
1, B
1) obtain tristimulus values (r
1, g
1, b
1), r wherein
1=Rlut (R
1), g
1=Glut (R
1), b
1=Blut (R
1).
This segmentation positive-going transition matrix generation module 203 is connected with this original lcd panel test unit 10, and according to accuracy requirement, every n rank GTG, chromatic value and brightness value according in the record calculate one 3 * 3 matrix M r2x, thereby to calculate a plurality of Mr2x
i, wherein i ∈ 1,2 ..., m},
This GTG interval selection module 204 links to each other simultaneously with this look-up table generation module 201 and this Lut positive-going transition module 202, by the digital actuation value (R of input
1, G
1, B
1) and GTG interval selection algorithm, select the GTG interval that it belongs to.
This first transformation of scale module 205 is connected with GTG interval selection module 204 with this Lut positive-going transition module 202, according to the result of this GTG interval selection module 204, provides ratio mapping for the first time, from (r
1, g
1, b
1) obtain (r
1', g
1', b
1').
The positive mapping block 206 of this colour gamut is connected with this first transformation of scale module 205, the phase transformation matrix M r2x that obtains from this GTG interval selection module 204
iWith the tristimulus values (r after the ratio variation
1', g
1', b
1') product obtain device independent coordinate (X
1', Y
1', Z
1').
This second transformation of scale module 207 is connected with the positive mapping block 206 of this colour gamut, so that secondary mapping to be provided, promptly from (X
1', Y
1', Z
1') generation (X
1, Y
1, Z
1).
As shown in Figure 5, this reverse Color Gamut Mapping unit 50 is roughly consistent with this forward Color Gamut Mapping unit 20, it specifically comprises: look-up table generation module 501, Lut inverse transform module 502, segmentation reciprocal transformation matrix generation module 503, the first transformation of scale module 504, colour gamut inverse mapping module 505, the second transformation of scale modules 506.
This look-up table generation module 501 is set up function with the look-up table of finishing target lcd panel test unit.
This second transformation of scale module 506 interrelates with this color converting unit 30 with this processing unit 40 that crosses the border, in the CIEXYZ color space, (the X that obtains
2, Y
2, Z
2) be transformed to (X
2', Y
2', Z
2').
The reverse matrix generation module of this segmentation 503 is according to accuracy requirement, and every several GTGs, chromatic value and brightness value according in the record calculate one 3 * 3 inverse-transform matrix Mx2r, thereby to calculate a plurality of Mx2r
i, i ∈ 1,2 ..., m}.
The phase transformation matrix M x2r that this colour gamut inverse mapping module 505 obtains from GTG interval selection module
iWith the device independent coordinate (X after the transformation of scale
2', Y
2', Z
2') tristimulus values (r that multiplies each other and obtain the target device dependent color spaces
2', g
2', b
2').
This first transformation of scale module 504 is according to GTG, (r
2', g
2', b
2') ratio mapping obtains (r
2, g
2, b
2).
This Lut inverse transform module 502 is according to this look-up table generation module 501, by the tristimulus values (r of input
2, g
2, b
2) search the digital actuation value (R that obtains exporting
2, G
2, B
2).
Shown in Fig. 2,4, it uses this piecewise linearity matrix product model to simulate the Color Gamut Mapping model of original liquid crystal display.A plurality of 3 * 3 the transform matrix M r2x that generates with segmentation, cooperate twice ratio mapping and four look-up tables, accurately described the irrelevant color space of liquid crystal display device as shown in Figure 2, cooperated three LUT models to obtain better degree of accuracy than one 3 * 3 matrix.
Again as shown in Figure 5, it still uses piecewise linearity matrix product model, system's desired color information has been converted back to device-dependent color space again, and has been shown on the target liquid crystal display.
As shown in Figure 6, be a preferred embodiment of the color management for light of LCD of the present invention, it is by the PC control-signals generator, send the digital actuation value (R, G, B), by the harmless liquid crystal display that transfers to of DVI converting interface.(X, Y Z), draw out the colour gamut of liquid crystal display device independent color space as shown in Figure 2 then to use the device independent color coordinate of color analysis instrument test and recording responses subsequently.
In sum, the present invention is directed to display devices such as LCD monitor with different photoelectric characteristics and color display characteristic, LCD TV, the method of the Color Gamut Mapping model of accurate this type of display device of description---dividual simulation algorithm is provided, has promptly increased the accuracy of color management process; And provide a kind of execution color management for light of LCD efficiently.
Claims (10)
1. the gamut mapping algorithm of a LCD, the color management for light that is used for LCD, it is characterized in that, described algorithm is by the model of piecewise linearity matrix product, cooperate four one dimension look-up tables and two ratio mapping functions, in order to the Nonlinear Mapping model of the colour gamut of simulated solution crystal display.Described method specifically may further comprise the steps:
Step 1, to the brightness of white point step by step and the chrominance information (X of liquid crystal display to be measured
w, Y
w, Z
w) w=0,1 ..., 255 test and record;
Step 2, the monochrome information and the chrominance information of test and record R, G, B monochrome from 0 to 255, i.e. (X respectively
r, Y
r, Z
r) r=0,1 ..., 255; (X
g, Y
g, Z
g) g=0,1 ..., 255; (X
b, Y
b, Z
b) b=0,1 ..., 255;
Step 3, according to accuracy requirement, every n rank GTG, from the record choose one group of (X
w, Y
w, Z
w), (X
r, Y
r, Z
r), (X
g, Y
g, Z
g), (X
b, Y
b, Z
b) value, calculate a matrix M r2x, calculate m=255/n matrix altogether;
Step 4, according to Y
w, Y
r, Y
g, Y
bGenerate the look-up table of four one dimensions: Wlut, Rlut, Glut, Blut;
Step 5, the original liquid crystal display pixel color value (R of input
1, G
1, B
1), earlier according to Rlut, Glut, Blut calculate tristimulus values (r
1, g
1, b
1); According to GTG interval selection algorithm, select affiliated GTG interval again; And take out this interval transform matrix M r2x of representative that step 3 calculates
iI ∈ 1,2 ..., m};
Step 6, according to the GTG interval of step 5 correspondence, to tristimulus values (r
1, g
1, b
1) carry out ratio mapping, i.e. (r
1', g
1', b
1')=f
Simu[gy, (r
1, g
1, b
1)];
Step 7, the linear transformation of calculating colour gamut are with the tristimulus values after the mapping and this interval mapping matrix multiple, i.e. (X
1', Y
1', Z
1') '=Mr2x
i* (r
1', g
1', b
1');
Step 8, select corresponding interval GTG gy according to step 5, to (X
1', Y
1', Z
1') carry out the ratio mapping second time, obtain required device independent coordinate (X
1, Y
1, Z
1), i.e. (X
1, Y
1, Z
1)=f
Lum[(X
1', Y
1', Z
1'), gy].
2. gamut mapping algorithm as claimed in claim 1 is characterized in that: this step 1 comprises that further control-signals generator sends white point signal step by step, tests and write down the colourity and the monochrome information of 256 grades of GTGs of liquid crystal display to be measured by the color analysis instrument.
3. gamut mapping algorithm as claimed in claim 1 is characterized in that: this step 2 comprises that further control-signals generator sends monochrome signal step by step, tests and write down the colourity and the monochrome information on 256 grades of monochromatic rank of liquid crystal display to be measured by the color analysis instrument.
4. the color management for light of a LCD is used for the liquid crystal display with different photoelectric characteristics and color display characteristic is carried out the color model simulation, thereby generates the controlled liquid crystal display color performance of sense organ expection, and described color management for light comprises:
Original lcd panel test unit, this unit testing is also write down the brightness and the chrominance information of the GTG passage of original LCDs, links to each other with forward Color Gamut Mapping unit;
Forward Color Gamut Mapping unit is to be mapped to device-independent color space to the relevant color space of the color value slave unit of object pixel;
Color converting unit is to provide the change of color coordinates in device-independent color space;
The processing unit that crosses the border, handling in device-independent color space, the color coordinates when the colour gamut of the colour gamut of original device and target device is unequal;
Reverse Color Gamut Mapping unit is used for the irrelevant color space of color of pixel value slave unit is mapped to the relevant color space of target device;
Target lcd panel test unit, the brightness and the chrominance information of the GTG passage of this unit testing and record object LCDs link to each other with reverse Color Gamut Mapping unit.
5. the color management for light of LCD as claimed in claim 4, it is characterized in that: this forward Color Gamut Mapping unit further comprises
Lut positive-going transition module, thereby by the digital actuation value (R that imports
1, G
1, B
1) obtain tristimulus values (r
1, g
1, b
1);
Segmentation positive-going transition matrix generation module, chromatic value and brightness value according in the record calculate a matrix M r2x;
GTG interval selection module is by the digital actuation value (R of input
1, G
1, B
1) and GTG interval selection algorithm, select the GTG interval that it belongs to;
The transformation of scale module according to the result of this GTG interval selection module, provides the ratio mapping;
The positive mapping block of colour gamut, the phase transformation matrix M r2x that obtains from this GTG interval selection module
iWith the tristimulus values (r after the ratio variation
1', g
1', b
1') product obtain device independent coordinate (X
1', Y
1', Z
1').
6. the color management for light of LCD as claimed in claim 5, it is characterized in that: this forward Color Gamut Mapping unit further comprises the look-up table generation module, generate the look-up table Wlut of four one dimensions according to white point, redness, green and 256 grades of blue brightness datas, Rlut, Glut and Blut.
7. the color management for light of LCD as claimed in claim 5, it is characterized in that: this transformation of scale module comprises the first transformation of scale module, according to the result of this GTG interval selection module, provides ratio mapping for the first time; And the second transformation of scale module, behind the positive mapping block of colour gamut, provide secondary mapping.
8. the color management for light of LCD as claimed in claim 4, it is characterized in that: this reverse Color Gamut Mapping unit further comprises:
Segmentation reciprocal transformation matrix generation module, according to accuracy requirement, every several GTGs, chromatic value and brightness value according in the record calculate an inverse-transform matrix Mx2r;
The transformation of scale module provides the ratio mapping according to GTG interval selection module result;
Colour gamut inverse mapping module, the phase transformation matrix M x2r that obtains from GTG interval selection module
iWith the device independent coordinate (X after the transformation of scale
2', Y
2', Z
2') tristimulus values (r that multiplies each other and obtain the target device dependent color spaces
2', g
2', b
2');
The Lut inverse transform module obtains the output rgb value of target liquid crystal display.
9. LCDs color management for light as claimed in claim 8 is characterized in that: this reverse Color Gamut Mapping unit further comprises target liquid crystal display look-up table generation module.
10. LCDs color management for light as claimed in claim 8 is characterized in that: this transformation of scale module comprises the first transformation of scale module, according to the result of this GTG interval selection module, provides ratio mapping for the first time; And the second transformation of scale module, so that secondary mapping to be provided.
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