Facsimile and static presentation processing – Natural color facsimile
Patent
1995-01-13
1998-03-17
Lee, Thomas D.
Facsimile and static presentation processing
Natural color facsimile
358532, 358448, 382254, 382266, H04N 146
Patent
active
057293600
ABSTRACT:
A color image processing system for generating recorder image signals of four colors containing India ink from three color signals, the color image processing system includes a converter for converting three color signals into separated brightness and chromaticity signals; a range converter for converting the brightness signal into a range converted brightness signal which is within a record color reproduction range; an edge detector for obtaining an edge amount signal from the range converted brightness signal; a chroma detector for detecting chroma of an image signal from the chromaticity signal; an edge enhancer for enhancing an edge part of an image represented by the range converted brightness signal; a smoothing circuit for smoothing the range converted brightness signal; a brightness and chromaticity converter which includes a converter for executing brightness conversion by mixing an output of the edge enhancer and an output of the smoothing circuit according to the edge amount signal detected by the edge detector and a converter for executing chromaticity conversion for providing a chromaticity signal corresponding to compression/expansion of the chroma according to an output of the edge detector and an output of the chroma detector; and a record color converter for generating recorder image signals of four colors containing India ink according to an output of the brightness and chromaticity converter using a color conversion table.
REFERENCES:
patent: 5231677 (1993-07-01), Mita et al.
patent: 5361147 (1994-11-01), Katayama et al.
"Consideration of Inking of Printing (I)," First Color Engineering Conference Paper Collection, Optics 4 Society, pp. 1-7, Proceedings of 1st Joint Conference on Color Technology, Nov. 20-21, 1984.
J.A.C. Yule, "Color Reproduction Theory," Print Society Publication Department, 1971, pp. 247-248.
John Wiley & Sons, "Digital Document Processing," pp. 26-32.
Kazama Noriyuki
Kita Shinji
Murai Kazumasa
Ogatsu Hitoshi
Suzuki Yuzuru
Fuji 'Xerox Co., Ltd.
Lee Thomas D.
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