Color image processing apparatus for color matching and color ma

Details Color image processing apparatus for color matching and color ma Color image processing apparatus for color matching and color ma

1996-01-24

1998-06-09

Vu, Kim Yen

Image analysis

Color image processing

Color correction

358520, 358529, H04N 160

Patent

active

057647950

ABSTRACT:
Three-dimensional LUTs produce a lightness signal L* from input color signals C, M and Y. The three-dimensional LUTs are respectively provided for four divisional sections of an input color signal K. A three-dimensional LUT switching device judges to what section a current value of the input color signal K belongs. A selector selects one of the LUTs in accordance with a judgment result. Similar processing is performed for chromaticity signals a* and b*. According to another aspect of the invention, three-dimensional LUT color converters produce color signals L.sub.2 *, a.sub.2 * and b.sub.2 * based on only input color signals C, M and Y. A position in the L*a*b* space of the color signals L.sub.2 *, a.sub.2 * and b.sub.2 * has a deviation from a position of color signals L.sub.1 *, a.sub.1 * and b.sub.1 * to be output actually. Based on an input color signal K, a one-dimensional LUT produces a lightness signal L.sub.3 *, which corresponds to the deviation. A color signal combining means produces final output color signals L.sub.1 *, a.sub.1 * and b.sub.1 * based on the color signals L.sub.2 *, a.sub.2 * and b.sub.2 * and the lightness signal L.sub.3 *.

REFERENCES:
patent: 4500919 (1985-02-01), Schreiber
patent: 4837722 (1989-06-01), Sara
patent: 4941038 (1990-07-01), Walowit
patent: 5008742 (1991-04-01), Shigaki et al.
patent: 5185661 (1993-02-01), Ng
patent: 5272468 (1993-12-01), Read
patent: 5285297 (1994-02-01), Rose et al.
patent: 5295000 (1994-03-01), Nonoshita et al.
patent: 5321797 (1994-06-01), Morton
patent: 5331440 (1994-07-01), Kita et al.
patent: 5359436 (1994-10-01), Dichter et al.
patent: 5608549 (1997-03-01), Usami

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