Scan/print system for performing image processing and an image s

Details Scan/print system for performing image processing and an image s Scan/print system for performing image processing and an image s

1992-02-18

1994-08-30

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358456, H04N 140

Patent

active

053432835

ABSTRACT:
Method of processing photoelectrically scanned image information representing different gray values, before such information is converted, by half-tone processing, into image information representing no more than two gray values, such that the scanned information is distinguished into different categories of information, each category being subjected to a filtering operation determined by the category, the information thus filtered for each category being suitable for subjecting to one type of half-tone processing.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4288821 (1981-09-01), Lavallee et al.
patent: 4707745 (1987-11-01), Sakano
patent: 4742400 (1988-05-01), Tsuji
patent: 4782399 (1988-11-01), Sato
patent: 4856075 (1989-08-01), Smith
patent: 4953114 (1990-08-01), Sato
patent: 5010497 (1991-04-01), Shimada
patent: 5014333 (1991-05-01), Miller et al.
patent: 5138672 (1992-08-01), Hirabayashi et al.
Digital Halftoning, R. Ulichney, 1987, MIT Press, Cambridge, at chapter 9, pp. 334-335.

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