Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-01-03
1994-03-22
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358462, 358538, A04N 1387
Patent
active
052969398
ABSTRACT:
An image area discriminating system for an image processing apparatus which discriminates between a character area and a halftone area on an original document containing the character and halftone areas, selects parameters for each discriminated area, and adjusts and generates image data. The image area discriminating system comprises: a block color discriminating unit for grouping pixels into blocks and determining block colors on the basis of the formed pixel blocks; a determining unit for detecting the run lengths of block colors other than white, for comparing the detected run lengths with a predetermined threshold value, and for determining whether the document area is the character area or the halftone area; and an area signal output unit for outputting a signal to select an image area signal on the basis of an output signal outputted from the determining unit.
REFERENCES:
patent: 4668995 (1987-05-01), Chen et al.
patent: 4953013 (1990-08-01), Tsuji et al.
patent: 5016118 (1991-05-01), Nannichi
patent: 5018024 (1991-05-01), Tanioka
patent: 5032904 (1991-07-01), Murai et al.
Coles Sr. Edward L.
Fuji 'Xerox Co., Ltd.
Stoll Thomas L.
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