Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-11-17
1989-08-01
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358464, 382 52, H04N 140
Patent
active
048537926
ABSTRACT:
An image signal binary encoder converts a document image photoelectrically into analog signals and then into digital image signals by an analog-to-digital converter. A small area is considered around each point of interest and the average density value of the area is compared with the density value of the point of interest. A choice is made between an ordinary binary conversion method and a dither method according to the result of this comparison.
REFERENCES:
patent: 4710822 (1987-12-01), Matsunawa
patent: 4722008 (1988-01-01), Ibaraki
patent: 4723173 (1988-02-01), Tanioka
patent: 4729035 (1988-03-01), Tanioka
Kamata Hiroshi
Katsuta Yuji
Britton Howard W.
Sharp Kabushiki Kaisha
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