Coding circuit for facsimile apparatus

Details Coding circuit for facsimile apparatus Coding circuit for facsimile apparatus

1983-10-31

1987-03-31

Olms, Douglas W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358135, 358136, 358260, H04N 1419, H04N 712

Patent

active

046547193

ABSTRACT:
An encoding circuit for a facsimile apparatus has an address-controllable memory for storing a video signal on a scan line which is being encoded. Two line memories alternately store a line of video signals which are read from the memory every time that the encoding of one scan line is completed. A write address counter transfers the video signals from the memory into one of the line memories, pixel by pixel. A circuit checks the video signals to detect a changing pixel. By comparing addresses in two succesive lines indicative of changing pixels, the signals are read out for facsimile transmission.

REFERENCES:
patent: 4097903 (1978-06-01), Nakagome et al.
patent: 4115815 (1978-09-01), Nakagome et al.
patent: 4212036 (1980-07-01), Nakagome et al.
patent: 4245257 (1981-01-01), Yamazaki et al.
patent: 4425582 (1984-01-01), Kadakia et al.
patent: 4486784 (1984-12-01), Abraham et al.
CCITT Recommendation T.4; Telegraph and Telematic Service Terminal Eqipment recommendations of the S and T Series vol. VII, Fascicle VII.2, CCITT (1981), pp. 222-235.

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