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Method and apparatus for correction of color shifts due to illuminant changes

  • US 5,771,311 A
  • Filed: 12/27/1995
  • Issued: 06/23/1998
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Fees
First Claim
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1. A color reproduction method for effecting color matching for a plurality of different color reproduction devices for reproducing the color of an original color image, comprising the steps of:

  • setting an intermediate color representation system which is represented by at least three characteristic parameter values obtained by multivariate analysis of a spectral reflectance or a spectral transmittance which is not dependent on an illuminant;

    learning a first neural network such that, when at least three color information values peculiar to each of said color reproduction devices are inputted, said at least three characteristic parameter values of said intermediate color representation system corresponding to said inputted color information values are outputted, and learning a second neural network such that, when said at least three characteristic parameter values of said intermediate color representation system are inputted, color information values corresponding to said inputted characteristic parameter values are outputted;

    transforming said at least three color information values peculiar to a first color reproduction device into said at least three characteristic parameter values of said intermediate color representation system by using said first neural network which has been learned;

    transforming said at least three characteristic parameter values under a constraint concerning colorimetric values of colors reproduced by said first color reproduction device and a second color reproduction device different therefrom; and

    transforming said at least three characteristic parameter values transformed under the constraint, into color information values of said second color reproduction device by using said second neural network which has been learned, so as to effect color matching for said plurality of different color reproduction devices.

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