Facsimile transceiver

Details Facsimile transceiver Facsimile transceiver

1978-05-15

1981-09-22

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04N 712

Patent

active

042913390

ABSTRACT:
A scanner scans an original document in two orthogonal directions and produces binary data signals representing the document. An extractor combines each two scan lines into one scan line by taking the logical sum of the data signals in corresponding positions in the two original scan lines. Each second data signal is removed. The data signals in even positions in one line are removed and the data signals in odd positions in the succeeding line are removed, thereby removing the data signals in a zig-zag manner. The data signals so processed are subjected to run-length encoding. In a receiver, the data signals are run-length decoded and fed into an interpolator which senses the data signals and inserts data signals into the spaces from which data signals were removed in accordance with a predetermined logical function. The interpolator controls a printer to print each scan lines twice to reproduce the original document.

REFERENCES:
patent: 2921124 (1960-01-01), Graham
patent: 3781902 (1973-12-01), Shim et al.
patent: 3801737 (1974-04-01), Komura et al.
patent: 3887763 (1975-06-01), Hinoshita et al.
patent: 3940737 (1976-02-01), Beun
patent: 3974326 (1976-08-01), Rosdolsky et al.
patent: 4068266 (1978-01-01), Liao
patent: 4163260 (1979-07-01), Hisao et al.
Wong-Picture Restoration Algorithm for Facsimile Machines, IBM Tech. Discl. Bull., vol. 19, #2 pp. 668-671, Jul. 1976.

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