Patent ID: 6278533
Filing Date: 2001-08-21
Classification: H04N

Abstract:
A method of converting arbitrary color signals in a first color space into color signals in a second color space, comprising:reading a color chart having a plurality of color patches representing typical colors with different chromas, lightnesses, and hues with a device which is to output color signals in the first color space;determining first-order and second order terms of the read color signals in the first color space as a group of first explanatory variables;subjecting the group of first explanatory variables to a principal component analysis for conversion into a group of second explanatory variables which cross each other;using colorimetric values of the color patches of the color chart as a group of criterion variables, and subjecting the group of criterion variables and the group of second explanatory variables to a multiple regression analysis to determine a matrix of partial regression coefficients; andsubjecting arbitrary color signals in the first color space to the matrix of partial regression coefficients for conversion into color signals in the second color space.