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Method and apparatus for generating color image mask

  • US 5,659,490 A
  • Filed: 06/06/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 06/23/1994
  • Status: Expired due to Fees
First Claim
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1. A method of generating mask data representing a desired color area in a color image, said method comprising the steps of:

  • (a) specifying n pieces of subject colors and m pieces of non-subject colors for defining said desired color area, where m and n are integers;

    (b) obtaining n pieces of first color vectors for said n pieces of subject color in a color space;

    (c) obtaining m pieces of second color vectors for said m pieces of non-subject colors in said color space;

    (d) forming n×

    m combinations of said first and second color vectors, and obtaining a third color vector linearly independent of the first and second color vectors with respect to each of said n×

    m combinations to form n×

    m sets of bases composed of said first through third color vectors;

    (e) expressing color of each pixel included in said color image by a linear combination of said first through third color vectors with respect to each of said n×

    m sets of bases, to thereby obtain first through third coefficients for said first through third color vectors with respect to each of said n×

    m sets of bases; and

    (f) generating said mask data as a function of said first coefficient obtained with respect to each of said n×

    m sets of bases.

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