Data compression system for binary facsimile signals

Details Data compression system for binary facsimile signals Data compression system for binary facsimile signals

1977-02-24

1978-09-26

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358261, H04N 140, H04N 712

Patent

active

041175174

ABSTRACT:
In a facsimile scanning and transmission system, the black and white binary bit pattern of each scan line is compared with that of the adjacent scan line just above it, and any bit pattern variations are identified as belonging to one of a number of predetermined modes. Each variation or bit difference mode, as well as a no variation mode, is assigned a coded bit pattern or sequence, and only these coded bit patterns are transmitted. Variations not conforming to one of the predetermined modes may be transmitted uncoded, after being preceded by an identification code. The net result is significant data compression with no loss in intelligence. The process is easily reversed at the receiver end to reconstruct the facsimile picture.

REFERENCES:
patent: 3801737 (1974-04-01), Komura
patent: 3916095 (1975-10-01), Weber

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