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Method of processing image signal

  • US 6,278,533 B1
  • Filed: 11/28/1997
  • Issued: 08/21/2001
  • Est. Priority Date: 11/29/1996
  • Status: Expired due to Fees
First Claim
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1. 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; and

    subjecting 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.

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