Facsimile and static presentation processing – Natural color facsimile – Specific image-processing circuitry
Patent
1991-03-06
1994-07-19
Eisenzopf, Reinhard J.
Facsimile and static presentation processing
Natural color facsimile
Specific image-processing circuitry
382 18, 358462, H04N 146
Patent
active
053314425
ABSTRACT:
A block judgment section judges whether a subject block including a plurality of subject pixels is a white block, a black character block or a graphic/color block, on the basis of the frequency of white subject pixels and the density distribution of grey subject pixels. A macro-correction section corrects a judgment value of a character block to that of a graphic block, or vice versa on the basis of a first judgment whether there exists a graphic area larger than a predetermined size in the blocks surrounding the subject block, and a second judgment on the ratio between character blocks and graphic blocks in the blocks directly adjoining the subject block. The macro-corrected judgment value of the subject block is used to select image data of a development color or colors required for reproducing the subject block.
REFERENCES:
patent: 4811239 (1989-03-01), Tsao
patent: 4888646 (1989-12-01), Umeda et al.
patent: 5020121 (1991-05-01), Rosenberg
patent: 5073953 (1991-12-01), Westdijk
patent: 5101438 (1992-03-01), Kanda et al.
patent: 5121224 (1992-06-01), Ng et al.
patent: 5148495 (1992-09-01), Imao et al.
Eisenzopf Reinhard J.
Fuji 'Xerox Co., Ltd.
Jackson Jill
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