Color adjustment apparatus

Details Color adjustment apparatus Color adjustment apparatus

1992-07-06

1994-02-22

Brinich, Stephen

Facsimile and static presentation processing

Natural color facsimile

Color correction

358515, H04N 140

Patent

active

052892956

ABSTRACT:
A color adjustment apparatus includes a color space conversion circuit for obtaining a chromaticity signal in a rectangular coordinate system of a plane representing hue and saturation components. A pointed color chromaticity signal setting circuit sets a pointed color chromaticity signal, which is the prominent color chromaticity signal desired to be changed. A color adjustment area setting circuit sets a color adjustment area of which the center is the pointed color chromaticity signal. A target color chromaticity signal setting circuit sets a target color chromaticity signal. A color conversion circuit generates a converted chromaticity signal (u.sub.h *, v.sub.h *). The converted chromaticity signal is obtained by shifting an original chromaticity signal (u*, v*) by an amount equal to a change from said pointed color chromaticity signal to said target color chromaticity signal. A weighting coefficient setting circuit sets a weighting coefficient (.omega.). And a color adjustment operating circuit generates a corrected chromaticity signal (u.sub.0 *, v.sub.0 *) which is a sum of the converted chromaticity signal and the original chromaticity signal added at the rate of the weighting coefficient (.omega.).

REFERENCES:
patent: 4649423 (1987-03-01), Hoffrichter et al.
patent: 4668979 (1987-05-01), Jung
patent: 4774567 (1988-09-01), Stansfield et al.
patent: 4873570 (1989-10-01), Suzuki et al.
patent: 4941038 (1990-07-01), Walowit
patent: 5047842 (1991-09-01), Bouman, Jr. et al.
patent: 5185661 (1993-02-01), Ng
patent: 5200816 (1993-04-01), Rose
patent: 5200817 (1993-04-01), Birnbaum

Affiliated with

Also associated with

Rating

Color adjustment apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color adjustment apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color adjustment apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-176064