Facsimile signal coding method

Details Facsimile signal coding method Facsimile signal coding method

1976-11-01

1978-09-19

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340347DD, 358261, H04N 140

Patent

active

041158156

ABSTRACT:
A facsimile signal coding method, in which information change picture elements are classified into two kinds of change points according to the information change directions. In case of the information change picture element having an information change from white to black, the relative distance between an instant information change picture element and a reference information change picture element selected from information change picture elements on the same scanning line or at least one immediately preceding scanning line is coded. In case of the information change picture element having an information change from black to white, the distance between an instant information change picture element to be coded and the immediately preceding information change picture element is predicted on the basis of information of a run already coded, so that an error between the predicted value and the run length of the instant run is coded. If the error exceeds the run length of the instant run, the run length of the instant run may be exceptionally coded.

REFERENCES:
patent: 3813485 (1974-05-01), Arps
patent: 3830966 (1974-08-01), Aldrich
patent: 3916095 (1975-10-01), Weber
patent: 3927251 (1975-12-01), White

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