Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1995-06-05
1997-12-09
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358465, 358512, 358515, 358520, H04N 140, H04N 136, G03F 308
Patent
active
056966113
ABSTRACT:
An achromatic color judging region is determined in a red-green-blue (RGB) color system, and it is judged in an achromatic color judging unit whether or not a color picture at a remarked pixel designated by a R multi-valued digital input signal, a G multi-valued digital input signal and a B multi-valued digital input signal is placed within the achromatic color judging region. Also, the RGB multi-valued digital input signals are converted into pieces of RGB binary data in an error dispersion processing unit while dispersing errors occurring in the RGB binary data. In case where it is judged that the color picture is an achromatic color because the color picture is placed within the achromatic color judging region, a piece of achromatic color data is generated from the RGB binary data in an achromatic color reproducing and color transforming unit and is output to reproduce the color picture at the remarked pixel. In contrast, in case where it is judged that the color picture is a chromatic color because the color picture is not placed within the achromatic color judging region, the RGB binary data are output to reproduce the color picture at the remarked pixel. Therefore, the color picture can be reproduced in a smoothly changed gradation in a small sized color picture processing apparatus.
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Nishimura Kazuyuki
Sato Shin'ichi
Coles Sr. Edward L.
Matsushita Graphic Communication Systems Inc.
Wallerson Mark
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