Graded facsimile image signal coding system

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

1989-03-22

1991-03-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Reduced time or bandwidth for static image communication

3582613, 358447, H04N 141

Patent

active

RE0335479

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 except said detected 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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