WO2007083717A1 - Procédé de création de matrice de conversion de couleur et procédé de conversion de couleur - Google Patents

Procédé de création de matrice de conversion de couleur et procédé de conversion de couleur Download PDF

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Publication number
WO2007083717A1
WO2007083717A1 PCT/JP2007/050725 JP2007050725W WO2007083717A1 WO 2007083717 A1 WO2007083717 A1 WO 2007083717A1 JP 2007050725 W JP2007050725 W JP 2007050725W WO 2007083717 A1 WO2007083717 A1 WO 2007083717A1
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color
gradation
color conversion
xyz
value
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PCT/JP2007/050725
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English (en)
Japanese (ja)
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Yoshifumi Shimodaira
Yoshiyuki Kawagoe
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National University Corporation Shizuoka University
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Priority to JP2007554958A priority Critical patent/JPWO2007083717A1/ja
Publication of WO2007083717A1 publication Critical patent/WO2007083717A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/67—Circuits for processing colour signals for matrixing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut

Definitions

  • the present invention relates to a color conversion matrix creation method and a color conversion method, and in particular, a color conversion matrix creation method when color conversion is performed by matrix calculation and a color conversion created by the color conversion matrix creation method.
  • the present invention relates to a color conversion method for color-converting an input image using a matrix. Background art
  • Non-Patent Document 1 there has been a demand for faithful color reproduction in places such as electronic commerce and telemedicine (see, for example, Non-Patent Document 1).
  • existing image systems perform color reproduction that depends on the device, the color displayed on the display appears to vary from device to device.
  • CMS color management system
  • SMM shaper ZMatri X Model
  • ICCdnternational Color or Consortium ICCdnternational Color or Consortium
  • Non-Patent Document 1 Shuichi Kagawa, Hiroaki Sugiura, "Current Status and Future of Color Management Technology", Mitsubishi Electric Technical Report, vol.76, No.ll, pp.739-742, (2002).
  • Non-Patent Document 2 MD Study Group et al. "Illustration Color Management Practice Rule Book 2005-200 6", MD Study Group, Works Corporation, pp.52-53, (2005).
  • Patent Document 3 International Color Consortium, "ICC Profile Specification Version 3.2", (1995).
  • Non-Patent Document 4 Dawn Wallner, "Building ICC profiles- the Mechanics and Engineering, (2000).
  • Non-Patent Document 5 Yuka Uchiumi et al. "Study on luminance dependence of color tone in liquid crystal display", Journal of the Institute of Image Information and Television Engineers, vol.25, No.72, pp.13-18, (2001).
  • Non-Patent Document 6 Mamoru Shimazu, Masanori Takaya, Gosuke Ohashi, Mifumi Shimohira, "High-fidelity color reproduction method for force tracking in displays", IEICE technical report, vol.103, No.649 , pp.37-40, (2004).
  • the above-described faithful color reproduction method has a problem that it takes a long time for color conversion because a color conversion matrix is created for each pixel.
  • the present invention has been made to solve the above-described problems, and is a color capable of high-precision and high-speed color conversion that enables faithful color reproduction in a display device or the like in which color tracking occurs. It is an object to provide a conversion matrix creation method and a color conversion method.
  • the color conversion matrix creation method creates a color conversion matrix for conversion to RGB signal values of the RGB color system, such as XYZ color system tristimulus values XYZ color.
  • a method for creating a color conversion matrix comprising: obtaining a RGB signal value corresponding to tristimulus values XYZ of a predetermined gradation using a predetermined color conversion matrix; and an RGB gradation value corresponding to the obtained RGB signal value Determining from the halftone reproduction characteristics of the predetermined display device, determining the tristimulus values XYZ corresponding to the determined RGB gradation values from the device profile of the display device, and determining the tristimulus of the predetermined gradations Obtaining the color difference between the tristimulus value XYZ of the predetermined tone and the tristimulus value XYZ of the reference tone after adjusting the brightness of the value XYZ to the tristimulus value XYZ of
  • the tristimulus value XYZ of the predetermined gradation and the reference gradation are obtained after matching the luminance of the tristimulus value XYZ of the predetermined gradation with the luminance of the tristimulus value XYZ of the reference gradation. Find the color difference from the tristimulus values XYZ. When the obtained color difference exceeds a predetermined threshold value, a process of creating and storing a color conversion matrix based on the tristimulus values XYZ of the predetermined gradation is executed for each primary color of RGB. For this reason, a color conversion matrix is created for each primary color for gradations where the color difference exceeds the threshold.
  • an optimum color conversion matrix corresponding to the gradation is selected from a plurality of created color conversion matrices and color conversion is performed, so that high-precision and high-speed color conversion can be performed. It becomes possible.
  • the predetermined display device can be a display device in which color tracking occurs.
  • the present invention is particularly effective when applied to a display device in which such color tracking occurs.
  • the color conversion method according to the present invention is a color conversion method for converting an XYZ color system tristimulus value XYZ into an RGB color system RGB signal value, the step of inputting the tristimulus value XYZ;
  • the step of obtaining RGB signal values corresponding to the input tristimulus values XYZ using a predetermined color conversion matrix, and halftone reproduction of the RGB gradation values corresponding to the obtained RGB signal values by a predetermined display device A step of obtaining from the characteristics, a step of selecting a color conversion matrix corresponding to the obtained RGB gradation value from the color conversion matrix created by the color conversion matrix creation method of the above configuration, and the input tristimulus value XYZ And a step of obtaining an RGB signal value corresponding to the obtained RGB signal value from the halftone reproduction characteristic.
  • the color conversion is performed by selecting the optimum color conversion matrix corresponding to the gradation from the plurality of color conversion matrices created by the color conversion matrix creating method having the above-described configuration. And high-speed color conversion becomes possible.
  • FIG. 1 is a schematic block diagram of a color conversion device.
  • FIG. 2 is a diagram showing an example of halftone reproduction characteristics.
  • FIG. 3 is a flowchart of a color conversion matrix creation process executed by a color conversion matrix creation unit.
  • FIG. 4 is a flowchart of color conversion processing executed by a color conversion unit.
  • FIG. 5 is a chromaticity diagram for explaining color tracking.
  • 10 ... color conversion device, 12 ... color conversion matrix creation unit, 14 ... storage unit, 16 ... color conversion unit.
  • FIG. 1 shows a schematic block diagram of a color conversion apparatus 10 to which the present invention is applied.
  • the color conversion apparatus 10 includes a color conversion matrix creation unit 12, a storage unit 14, and a color conversion unit 16.
  • the color conversion matrix creating unit 12 performs color change based on device profiles (colorimetric data), halftone reproduction characteristics (TRC) data, and the like stored in the storage unit 14.
  • a color conversion matrix is created by obtaining a conversion matrix coefficient.
  • the color conversion unit 16 uses the color conversion matrix created by the color conversion matrix creation unit 12 to convert the input XYZ color space image data (XYZ data) into the RGB color system. Convert to color space image data (RGB data) and output.
  • the storage unit 14 is a display device that displays an image based on the RGB data that has been color-converted by the color conversion device 10, and is a device profile of the display device that may cause color tracking, and the display device.
  • Halftone reproduction characteristic data, a color conversion creation processing program executed by the color conversion matrix creation unit 12 described later, a color conversion processing program executed by the color conversion unit 16, and the like are stored in advance.
  • the device profile is tristimulus XYZ data corresponding to all RGB gradations. It is obtained as follows. For example, change the RGB gradation value for each primary color in increments of several gradations (for example, in increments of 8 gradations) and input it to the display device, and measure the color output from the display device each time with a colorimeter. Tristimulus values XYZ for each primary color number gradation step are obtained. The tristimulus values XYZ of other gradations are obtained by linear interpolation. As a result, tristimulus values XYZ corresponding to all RGB gradations are obtained. The tristimulus values XYZ corresponding to all RGB gradations may be obtained by colorimetry.
  • FIG. 2 shows an example of halftone reproduction characteristics of a liquid crystal projector.
  • the halftone reproduction characteristic shows the correspondence between the RGB gradation value (input value) and RGB signal value (output value) of the display device.
  • Halftone reproduction characteristic data is data representing halftone reproduction characteristics as shown in the figure, that is, table data and expressions indicating the correspondence between RGB gradation values and RGB signal values, and is stored in the storage unit 14 for each primary color. Stored in advance.
  • the values of the coefficients X, Y, Z, X, Y, Z, X, Y, and Z of the color conversion matrix are
  • the tristimulus value repulsive force at the gradation value 255 which is the maximum gradation of each primary color obtained from the vice profile is also a value obtained by subtracting the tristimulus value ⁇ of the gradation value 0 which is a bias component.
  • X, ⁇ , and ⁇ correspond to the tristimulus value ⁇ ⁇ corresponding to R of gradation value 255 to R of gradation value 0.
  • the corresponding tristimulus value is the value obtained by subtracting ⁇ , and X, ⁇ , and ⁇ correspond to G with a gradation value of 255.
  • the tristimulus value ⁇ is the value obtained by subtracting the tristimulus value ⁇ ⁇ corresponding to G with a gradation value of 0, X, ⁇
  • ⁇ is the tristimulus value ⁇ corresponding to ⁇ with a gradation value of 255
  • the corresponding tristimulus values XYZ are X, ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , ⁇ , respectively.
  • an RGB gradation value is obtained from the RGB signal value. That is, the R tone value of R is obtained using the R halftone reproduction characteristic data, the G signal value force of the G tone value is obtained using the G halftone reproduction characteristic data, Using the halftone reproduction characteristic data for B, obtain the gradation value of the signal value B of B.
  • SMM always uses the tristimulus values XYZ of the highest luminance (maximum gradation) of each primary color for matrix calculation, so the effect of color tracking is not taken into consideration and power error is not considered. In a display device in which tracking occurs, optimal color reproduction cannot be obtained.
  • a plurality of color conversion matrices are created for each primary color according to the gradation value, and at the time of color conversion, a color conversion matrix suitable for the gradation value is selected and color is selected. Convert. This enables high-speed and high-precision color reproduction even in a display device in which color tracking occurs.
  • step 100 the color conversion matrix creating unit 12 sets a reference gradation d to be described later.
  • each primary color is represented by 8-bit data, and 256 gradations from 0 to 255 are set, and 255 which is the maximum gradation is set as a reference gradation.
  • step 102 a primary color for which a color conversion matrix is to be created is set.
  • a color conversion matrix is created for each of the three primary colors R, G, and B. Therefore, for example, R is initially set.
  • step 104 an initial color conversion matrix of a color conversion matrix for converting XYZ color system image data into RGB color system image data is set.
  • the coefficients of the color conversion matrix of the above equation (1) are used as the tristimulus values X, Y, Z, corresponding to the primary colors R, G, B of the gradation value 255 as the reference gradation.
  • X, Y, Z the coefficients of the color conversion matrix of the above equation (1) are used as the tristimulus values X, Y, Z, corresponding to the primary colors R, G, B of the gradation value 255 as the reference gradation.
  • step 106 the sum of tristimulus values XYZ of gradations e of R, G, and B obtained from the device profile is added to XYZ in the above equation (1) to obtain an RGB signal value.
  • the first gradation e is 255, which is the maximum gradation. That is, X in the above equation (1) is (X
  • an RGB gradation value is obtained from the RGB signal value using the halftone reproduction characteristic data of each primary color stored in the storage unit 14. That is, R gradation value is obtained from R signal value using R halftone reproduction characteristic data, G signal value force is also obtained G gradation value using G halftone reproduction characteristic data, Use the halftone reproduction characteristics data for B to find the tone value of the signal value B of B.
  • step 110 tristimulus values XYZ corresponding to the RGB gradation values obtained in step 108 are obtained from the device profile stored in the storage unit 14.
  • step 112 the color difference between the tristimulus value XYZ of the gradation e obtained in step 110 and the tristimulus value XYZ of the reference gradation d is obtained.
  • the first reference gradation d is 255, which is the maximum gradation
  • the tristimulus value XYZ corresponding to R of gradation 255 obtained from the device profile is set as the tristimulus value XYZ for comparison.
  • the color difference from the three-stone intensity XYZ of the gradation e obtained in step 110 is set.
  • the tristimulus value XYZ of the gradation e is matched to the luminance of the reference gradation d, and then the tristimulus value XYZ of both is converted to Lab color system data.
  • the power also calculates the color difference. That is, by replacing Y of the tristimulus value XYZ of the gradation e with Y of the tristimulus value XYZ of the reference gradation, and further multiplying the X and Z of the tristimulus value XYZ of the gradation e by a predetermined factor, Adjust the brightness of the tristimulus value XYZ of key e to the brightness of the reference gradation d.
  • the CIE2000 color difference formula for example, see Non-Patent Document 7 below.
  • step 114 it is determined whether or not the obtained color difference exceeds a predetermined threshold value.
  • the threshold that is a criterion for allowing matrix conversion is, for example, a color difference (a color difference that is perceived by human eyes from two colors (for example, the following non-patent document 8) is used.
  • the specific threshold value is set to 0.2 in the present embodiment as the relationship between the number of color conversion matrices to be created and the average color difference.
  • step 110 If the color difference between the tristimulus value XYZ obtained in step 110 and the tristimulus value XYZ of the reference gradation d to be compared exceeds the threshold value, the process proceeds to step 116. If not, go to step 120.
  • step 116 the color conversion matrix is updated, and the updated color conversion matrix is stored in the storage unit 14.
  • the color conversion matrix is updated using the coefficients X,,, Z of the current color conversion matrix.
  • step 118 the reference gradation d is changed to the current gradation e.
  • the reference gradation d is changed to the current gradation e, and when the color difference is equal to or less than the threshold, the reference gradation d is not changed and is left as it is.
  • step 120 it is determined whether or not the processing in steps 106 to 118 has been completed for all the gradations of the primary color R, specifically, whether or not the gradation e has become zero. Then, when the processing of Steps 106 to 118 is completed for all gradations of the primary color R, the process proceeds to Step 124. Otherwise, the process proceeds to Step 122.
  • step 122 the gradation e is lowered by one and the process returns to step 106.
  • the R component of the tristimulus value XYZ entering XYZ in the above equation (1) is set to a value obtained by lowering the gradation by one. That is, X in the above equation (1) is (X + X + X)
  • step 120 is affirmed and the routine proceeds to step 124.
  • step 124 it is determined whether or not the processing in steps 102 to 122 has been completed for all primary colors. If it is determined that the process has been completed, the process proceeds to step 126. If the process has been completed, the process proceeds to step 102 and G and B are processed in the same manner as described above.
  • step 126 the coefficients of all the created color conversion matrices are output to the color conversion unit 16 and the routine is terminated.
  • the color conversion unit 16 stores the coefficient of the color conversion matrix of each primary color output from the color conversion matrix creation unit 12.
  • the luminance of the tristimulus value XYZ of the gradation e is matched with the luminance of the tristimulus value XYZ of the reference gradation d, and the color difference between the two is obtained.
  • the process of creating a new color conversion matrix is performed for all gradations of all primary colors.
  • as many color conversion matrices are created as the number of color differences equal to or greater than the threshold value for each primary color. That is, the number of color conversion matrices created is (number of color conversion matrices created for R) X (number of color conversion matrices created for G) X (number of color conversion matrices created for B).
  • the gradation value where the color difference is greater than or equal to the threshold value that is, the gradation value for which the color conversion matrix has been created and changed (the gradation value that changes the color conversion matrix during color conversion) is the matrix-changed gradation value. Called.
  • step 200 the tristimulus value XYZ is input, and in step 202, this is converted to S. M.
  • Y, Z, X, Y, Z values are tristimulus values XY with gradation value 255, which is the maximum gradation of each primary color
  • step 204 using the halftone reproduction characteristic data stored in the storage unit 14, an RGB gradation value is obtained from the RGB signal value.
  • the tone value of the R signal value scale is obtained using the R halftone reproduction characteristic data
  • the G signal value force is also obtained of the G tone value using the G halftone reproduction characteristic data.
  • the halftone reproduction characteristic data for B obtain the gradation value of B for the B signal value.
  • step 206 a color conversion matrix corresponding to the RGB gradation value obtained in step 204 For each primary color. For example, if the R matrix change gradation value is 240, 225, 210, etc., and the R gradation value obtained in step 204 is a value within the range of 255-241, Since this is the gradation before the matrix is changed, a color conversion matrix is selected in which the tristimulus value XYZ value of gradation value 255, which is the maximum gradation of each primary color, is a coefficient. If the R gradation value obtained in step 204 is in the range of 240 to 226, the color conversion matrix created when the matrix change gradation value is 240 is selected.
  • the color conversion matrix created when the matrix change tone value is 225 is selected.
  • the color conversion matrix is changed for each primary color with a gradation value at which the color difference is equal to or greater than the threshold value.
  • step 208 using the selected color conversion matrix, the input tristimulus values XYZ are converted into RGB signal values. That is, the coefficient X, Y of the color conversion matrix selected for R
  • Color conversion is performed using a color conversion matrix with B B B as coefficients.
  • step 210 as in step 204, using the halftone reproduction characteristic data stored again in the storage unit 14, an RGB gradation value is obtained from the RGB signal value and output.
  • the tristimulus value XYZ for each tone value is set after adjusting the brightness of the tristimulus value XYZ to the brightness of the reference tone. And the tristimulus values XYZ of the reference gradation are obtained, and if this color difference exceeds the threshold, a new color conversion matrix is created and stored.
  • color conversion is performed by selecting a color conversion matrix corresponding to the gradation value of each primary color. In other words, since the color conversion matrix having the optimum color conversion matrix is selected for each gradation, color reproduction with high speed and high accuracy is possible even in a display device in which color tracking occurs.
  • the reference gradation to be initially set is set to 255 which is the maximum gradation.
  • the present invention is not limited to this, and other gradation values such as an intermediate gradation are used. You can set 128 as the reference gradation.
  • the coefficients of the initial color conversion matrix are X, Y
  • tone value 128 For example, from tone value 128
  • the present invention is not limited to this. Try to determine the color difference while changing multiple gradations, such as one by one.
  • the present inventors verified the color reproduction accuracy and color conversion time of the color conversion matrix creation method according to the present invention described above and the color conversion method using the color conversion matrix created thereby. .
  • a liquid crystal projector was used as the display, and a spectral radiance meter was used as the measuring instrument. The measurement was performed in a dark room, a single color was projected on the screen from a liquid crystal projector, and the measurement point was approximately the center of the screen.
  • RGB primary color data input to the LCD projector is expressed as (R, G, B), (8, 0, 0), (0, 8, 0), (0, 0, 8), (16, (0, 0), (0, 16, 0), (0, 0, 16) ... (255, 0, 0), (0, 255, 0), (0, 0, 255)
  • This primary color was input to the liquid crystal projector in increments of 8 gradations, a single color was projected on the screen from the liquid crystal projector, and tristimulus values XYZ were measured using a spectral radiance meter. Tristimulus values XYZ between each measurement point were obtained by linear interpolation.
  • FIG. 5 shows the chromaticity of all the gradations of each primary color measured in this way.
  • the chromaticity of each primary color that is, the ratio of XYZ is not constant with respect to the change in luminance.
  • the chromaticity changes in the green direction as the luminance decreases for both red, green, and blue, confirming that color tracking has occurred.
  • Table 1 shows the luminance L and chromaticity u ′, v ′ of white (red + green + blue) and original white (white) displayed by adding each primary color of the liquid crystal projector. The value is shown.
  • the threshold value is set to 0.2.
  • the average color difference was 0.67, which was about a quarter of S.M.M. It was also confirmed that the accuracy was as high as the faithful color reproduction method.
  • This color difference is a second-class color difference (see Non-Patent Document 8 below), but it is an accuracy that can be recognized as almost the same when both are judged side by side.
  • the color conversion time shown in Table 4 is a relative value when the average color conversion time when each image is color-converted by the method according to the present invention is represented by 1.0.
  • the color conversion time can be reduced to about 1/50 of the faithful color reproduction method.
  • Table 5 shows the results of the number of color conversion matrices created for each primary color (number of matrix change gradation values).
  • the present invention 1 0 3 5 2 0 7 0 0 0 0
  • the number of G and B matrix change gradation values is larger and the number of R matrix change gradation values is smaller than in the present invention.
  • the proposed method has increased the number of color conversion matrices due to the influence of luminance on the criteria for determining the gradation value for changing the color conversion matrix.
  • the luminance difference is matched to the reference gradation and the color difference is compared, and the difference only in chromaticity is used as the criterion.
  • the color reproduction accuracy can be made equal to that of the proposed method, and the number of color conversion matrices can be reduced to about one-fourth.
  • color conversion matrix creation method and the color conversion method of the present invention even in a display device in which color tracking occurs, color reproduction can be performed with high accuracy and color conversion can be performed at high speed. We were able to confirm that it was possible.
  • Non-Patent Document 7 G. Sharma ⁇ W. Wu, ENDalal: "The CIEDE2000 Color- Difference r ormula: Implementation Notes, supplementary 1 est Data ⁇ and Mathematical Obs ervations, ..., Color Research and Application ⁇ vol.30, No. l (2005).
  • Non-patent Document 8 The Japan Society of Color Science: “New Color Science Handbook [2nd edition]", University of Tokyo Press (1998).
  • Non-patent literature 9 Kawagoe Yoshiyuki, Shimazu Yasunori, Ohashi Gosuke, Shimohira Mifumi: "High-fidelity color conversion method of display corresponding to color tracking", 11th Symposium on Image Sensing, pp.543-546, (2005) .
  • Non-Patent Document 10 The Institute of Image Electronics Engineers of Japan: "SHIPP High-Definition XYZ 'CIELAB' RGB Standard Image” (1997).
  • the present invention can be used as a color conversion matrix creation method and a color conversion method capable of high-accuracy and high-speed color conversion that enables faithful color reproduction in a display device or the like in which color tracking occurs.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Image Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

L'invention concerne un XYZ correspondant à une valeur de signal RVB d'une gradation prédéterminée obtenu par l'utilisation d'une matrice de conversion de couleur (étape 106). Une valeur de gradation RVB correspondant à la valeur de signal RVB est obtenue à partir de la caractéristique de reproduction normale d'un dispositif d'affichage (étape 108). Le XYZ correspondant à la valeur de gradation RVB est obtenu à partir d'un profil de dispositif du dispositif d'affichage (étape 110). La luminance du XYZ de la gradation prédéterminée est mise en correspondance avec la luminance de XYZ d'une gradation de référence et une différence de couleur entre le XYZ de la gradation prédéterminée et le XYZ de la gradation de référence est obtenue (étape 112). Si la différence de couleur obtenue dépasse une valeur de seuil, une matrice de conversion de couleur est créée à partir du XYZ de la gradation prédéterminée et stockée, et la gradation de référence est modifiée selon la gradation prédéterminée (étapes 114 à 118). Un processus pour modifier la gradation prédéterminée d'une gradation (étape 122) est exécuté pour toutes les gradations et chacune des couleurs primaires RVB. Ceci permet une conversion de couleur très précise et très rapide capable de réaliser une reproduction couleur fidèle sur un dispositif d'affichage où le tracé de couleur est provoqué.
PCT/JP2007/050725 2006-01-18 2007-01-18 Procédé de création de matrice de conversion de couleur et procédé de conversion de couleur WO2007083717A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2476722A (en) * 2009-12-29 2011-07-06 Intel Corp Colour Gamut Space Conversion
US9025222B1 (en) 2014-06-24 2015-05-05 Xerox Corporation Scanner calibration using inverse matrix

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KAWAGOE Y. ET AL.: "Color-Tracking ni Taio Shita Display no Ko Chujitsu Iro Henkan Hoshiki (High Fidelity Color Conversion Method to Solve the Color Tracking Problem)", DAI 11 KAI SYMPOSIUM ON SENSING VIA IMAGE INFORMATION KOEN RONBUNSHU, 2005, pages 543 - 546, XP003015442 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2476722A (en) * 2009-12-29 2011-07-06 Intel Corp Colour Gamut Space Conversion
GB2476722B (en) * 2009-12-29 2013-08-28 Intel Corp Techniques for adapting a colour gamut
US8654141B2 (en) 2009-12-29 2014-02-18 Intel Corporation Techniques for adapting a color gamut
US9025222B1 (en) 2014-06-24 2015-05-05 Xerox Corporation Scanner calibration using inverse matrix

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