Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-06-27
1993-09-28
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358298, 358452, 358462, H04N 140
Patent
active
052490670
ABSTRACT:
A halftone image is formed from a contone image with one of a hardware dot generator and a software dot generator. Halftone dots in simpler shapes used in usual reproduction or printing are formed with the hardware dot generator; thus high-speed dot generation is accomplished. Halftone dots in special shapes or of special conditions are formed with the software dot generator; thus flexible dot generation is accomplished. A dot shape, a screen ruling, and a screen angle are input as halftone dot information. When the halftone dot information corresponds to a basic pattern stored in a screen pattern memory in the hardware dot generator, the hardware dot generator is activated to produce binary halftone-dot image data. When the halftone dot information corresponds to a basic pattern stored in a memory in the software dot generator, the software dot generator is activated to produce binary halftone-dot image data according to a dot generation program.
REFERENCES:
patent: 4727430 (1988-02-01), Miwa
patent: 4866533 (1989-09-01), Nagashima
patent: 4972500 (1990-11-01), Ishii et al.
Coles Sr. Edward L.
Dainippon Screen Mfg. Co,. Ltd.
Williams Kimberly A.
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