Digital facsimile system to band-compress half-tone picture sign

Details Digital facsimile system to band-compress half-tone picture sign Digital facsimile system to band-compress half-tone picture sign

1979-10-04

1982-10-05

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358138, 358280, H04N 712

Patent

active

043530966

ABSTRACT:
A digital facsimile system provides band-compression of half-tone picture signals. Primarily, a plurality of analog signals are derived by successively scanning a picture. Thereafter, the analog signals are converted into digital signals and then the digital signals are compressed. Initially, the digital signals are pulse trains of two-level signals, representing the scanned picture, sliced into segments at multi-level quantization levels. Band compression is realized after a plurality of two-level digital pulse trains are compared. Only the differences between corresponding bits, which are found by the comparison, are encoded and transmitted.

REFERENCES:
patent: 3882270 (1975-05-01), Ogawa
patent: 3891793 (1975-06-01), De Loye
patent: 3902008 (1975-08-01), Ogawa
patent: 4070694 (1978-01-01), Sakamoto et al.

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