Patent ID: 6995864
Filing Date: 2006-02-07
Classification: G06T,H04N

Abstract:
1. A color conversion device for performing pixel-by-pixel color conversion from a first set of three color data representing red, green and blue, or cyan, magenta and yellow, into a second set of three color data representing red, green and blue, or cyan, magenta, and yellow, said device comprising: first calculation means for calculating a minimum value α and a maximum value β of said first set of three color data for each pixel; hue data calculating means for calculating hue data r, g, b, y, m and c based on said first set of three color data, and said minimum and maximum values α and β outputted from said first calculating means; means for generating first comparison-result data based on the hue data outputted from said hue data calculating means; means for generating second comparison-result data based on said first comparison-result data, the second comparison-result data being substantially effective for only one inter-hue region between adjacent hues of red, green, blue, cyan, magenta, and yellow; second calculation means for performing calculation using the hue data outputted from said hue data calculating means to produce calculation result data; coefficient generating means for generating specified matrix coefficients for the hue data, the calculation result data, the first comparison-result data and the second comparison-result data; third calculation means responsive to said hue data, said first comparison-result data, said second comparison-result data, said calculation result data, and the coefficients from said coefficient generating means for calculating a third set of three color data representing red, green and blue, or cyan, magenta, and yellow, said third calculation means performing calculation including matrix calculation performed on said hue data, said first comparison-result data, said second comparison-result data, said calculation result data, and the coefficients from said coefficient generating means; and gray scale conversion means for converting the gray scale of said third set of three color data, to produce said second set of three color data.