Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1991-11-26
1994-09-06
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358520, 358521, H04N 146, G03F 308
Patent
active
053453204
ABSTRACT:
In a color image data processing apparatus for processing three color image data of three primary colors for representing a specified pixel, in response to one color image data preselected among the three color image data, a threshold data generator generates threshold data for representing upper and lower limits of respective ranges in which two color image data other than the preselected one color image data are to be present when the specified pixel is a monochrome pixel of white, black or half-tone black, and a monochrome pixel detector compares the other two color image data with the threshold data generated by the generation means, and judges that the specified pixel is the monochrome pixel when both of the other two color image data are respectively fallen in the respective ranges from the upper limit to the lower limit.
REFERENCES:
patent: 4623917 (1986-11-01), Noguchi
patent: 4682186 (1987-07-01), Sasaki et al.
patent: 4831409 (1989-05-01), Tatara et al.
patent: 4908712 (1990-03-01), Uchiyama et al.
patent: 4992863 (1991-02-01), Moriya
patent: 5032904 (1991-07-01), Murai et al.
Coles Sr. Edward L.
Minolta Camera Kabushiki Kaisha
Rogers Scott A.
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