Color reproducing system
First Claim
1. A color reproduction system having color image display means, arid color conversion means for converting input tristimulus values into a color image signal to be input to the color image display means, wherein the color conversion means comprises:
- maximum brightness signal calculating means for calculating three color reproduction area corner vectors that indicate three corners of a plane constituting a color reproduction area surface of the color image display means, the three color reproduction area corner vectors surrounding vectors of the input tristimulus values, the maximum brightness signal calculating means also calculating a weighting factor obtained when the input tristimulus values are expressed as a linear sum of tristimulus values of the color reproduction area corner vectors; and
color image signal calculating means for calculating a color image signal used to display the input tristimulus values, on the basis of signal values corresponding to the color reproduction area corner vectors and the weighting factor.
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Abstract
A color reproduction system includes a color conversion unit for displaying a color image on a multi-primary-color display. The color conversion unit includes a maximum brightness signal calculating unit for calculating signals corresponding to three color reproduction area corners as the corners of a plane that constitute a color reproduction area surface of the display. The three color reproduction area corners surround the vectors of input tristimulus values. The maximum brightness signal calculating unit also calculates a weighting factor obtained when the input tristimulus values are expressed as a linear sum of the tristimulus values of the color reproduction area corner vectors. The color conversion unit further includes a color image signal calculating unit for calculating a color image signal used to display the input tristimulus values, on the basis of the signals corresponding to the color reproduction area corners and the weighting factor. The color reproduction system can realize colorimetrically accurate reproduction, provide continuity between XYZ data and signal values, and use the color reproduction area to the maximum extent.
97 Citations
22 Claims
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1. A color reproduction system having color image display means, arid color conversion means for converting input tristimulus values into a color image signal to be input to the color image display means, wherein the color conversion means comprises:
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maximum brightness signal calculating means for calculating three color reproduction area corner vectors that indicate three corners of a plane constituting a color reproduction area surface of the color image display means, the three color reproduction area corner vectors surrounding vectors of the input tristimulus values, the maximum brightness signal calculating means also calculating a weighting factor obtained when the input tristimulus values are expressed as a linear sum of tristimulus values of the color reproduction area corner vectors; and
color image signal calculating means for calculating a color image signal used to display the input tristimulus values, on the basis of signal values corresponding to the color reproduction area corner vectors and the weighting factor. - View Dependent Claims (3, 5, 7, 8, 10, 11, 12, 13, 15, 17, 19)
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2. A color reproduction system having color image display means, and color conversion means for converting input tristimulus values into a color image signal to be input to the color image display means, wherein the color conversion means comprises:
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chromaticity area calculating means for calculating a chromaticity area surrounded by corners of planes constituting a color reproduction area surface of the color image display means;
matrix calculating means for calculating matrix data that provides a relationship between tristimulus values of the corners and the color image signal;
matrix data storage means for storing the matrix data in relation to the chromaticity area; and
color image signal calculating means for converting the input tristimulus values into the color image signal, using part of the matrix data selected on the basis of chromaticity values of the input tristimulus values. - View Dependent Claims (4, 6, 9, 14, 16, 18, 20, 21, 22)
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Specification