Halftone picture processing apparatus

Details Halftone picture processing apparatus Halftone picture processing apparatus

1986-01-08

1988-01-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358282, H04N 140

Patent

active

047220082

ABSTRACT:
A halftone picture processing apparatus has devices for dividing and storing an image signal in the form of blocks each of which consists of a plurality of pixels, for setting at least one path for accessing the pixels in each block, calculating the number of changes in image signals which satisfies predetermined conditions, the changes occurring between succeeding pixels in each block along the path, and detecting a halftone region in accordance with the number of changes in image signals.

REFERENCES:
patent: 4254438 (1981-03-01), Yamazaki et al.
patent: 4577235 (1986-03-01), Kannapell et al.

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