Facsimile and static presentation processing – Natural color facsimile – Color separation
Patent
1993-05-03
1995-02-07
Brinich, Stephen
Facsimile and static presentation processing
Natural color facsimile
Color separation
358518, H04N 146
Patent
active
053879880
ABSTRACT:
An image processing apparatus for converting red, green, and blue luminance signals into cyan, magenta, and yellow density signals comprises: a first signal processing circuit for producing the cyan density signal from the red luminance signal; a second signal processing circuit for producing the magenta density signal from the green luminance signal and the cyan density signal; and a third signal processing circuit for producing the yellow density signal from the blue luminance signal, the cyan signal, and the magenta signal. Each of signal processing circuits comprises one or more look-up tables. The table of the second signal processing circuit may include the function of the first signal processing circuit and is supplied with red and green luminance signals. The third signal processing circuit has first and second tables. The first table responds to the cyan density signal and the blue luminance signal. The second table responds to the magenta density signal and the result of the first table. An image formation apparatus including the image signal processing apparatus mentioned above is disclosed also.
REFERENCES:
patent: 5065234 (1991-12-01), Hung et al.
patent: 5079624 (1992-01-01), Sasuga et al.
patent: 5187570 (1993-02-01), Hibi et al.
Hayashi Yoshitsugu
Hiratsuka Seiichiro
Yamaguchi Hiroshi
Brinich Stephen
Matsushita Electric - Industrial Co., Ltd.
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