Graded facsimile image signal coding system

Details Graded facsimile image signal coding system Graded facsimile image signal coding system

1986-02-25

1987-03-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358263, 358284, 358261, 382 56, H04N 140

Patent

active

046529357

ABSTRACT:
A graded facsimile image signal coding system is disclosed which is provided with means for distributing a multi-graded facsimile picture signal, represented by 2.sup.n gradation levels, into n bit planes corresponding to n digits; initial encoding means for detecting, from picture elements forming each bit plane, picture elements at intervals of .DELTA.X picture elements on every .DELTA.Y-th line and encoding the detected picture elements; and additional coding means for further coding each one of said encoded picture elements with reference to encoded four picture elements positioned around said one picture element to be coded.

REFERENCES:
patent: 4150401 (1979-04-01), Yamamoto et al.
patent: 4266249 (1981-05-01), Chai et al.
patent: 4414580 (1983-11-01), Johnsen et al.
patent: 4578704 (1986-03-01), Gharavi
patent: 4598372 (1986-07-01), McRoberts

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