Optoelectronic reading apparatus

Details Optoelectronic reading apparatus Optoelectronic reading apparatus

1977-09-27

1979-07-03

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 117

Patent

active

041602790

ABSTRACT:
For facsimile transmission or the like an optical system scans an original document and produces quantized electrical signals which are stored in a buffer memory. A data compression unit reads out the signals and performs data compression thereon asynchronously with storage of the signals in the buffer memory. The data compression rate decreases in accordance with the proportion of high density areas of the document, and the electrical data signals accumulate in the buffer memory. The scanning speed is automatically decreased as the amount of signals in the buffer memory increases so that the scanning speed is controlled to correspond to the data compression rate.

REFERENCES:
patent: 3344231 (1967-09-01), Dodd et al.
patent: 3472953 (1969-10-01), Montevecchio
patent: 3499975 (1970-03-01), Arps
patent: 3581000 (1971-05-01), Hansen et al.
patent: 3670099 (1972-06-01), Oliver
patent: 3941926 (1976-03-01), Slobodzian et al.
patent: 3947627 (1976-03-01), Tanaka
Cassada, Garcia--Graphic Communication System Incorporating Scan Resolution Control--IBM Tech. Discl., vol. 15, #8, Jan. 1973, p. 2367.

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