Half tone encoder/decoder

Details Half tone encoder/decoder Half tone encoder/decoder

1977-04-04

1980-03-11

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, 358138, H04N 100

Patent

active

041930967

ABSTRACT:
A system for compressing or compacting scanned image data is disclosed. The system electronically subdivides the image data pixel pattern into quadrants and predictively encodes pictorial data by predicting, from the established image values of adjoining quadrants, an image value for each quadrant. The predicted image value is then compared with the established image value and the magnitude of the error, if any, determined. The error, if any, is then encoded to provide a relatively highly compressed description of the image suitable for transmittal, storage, and the like.

REFERENCES:
patent: 3462547 (1969-08-01), Macovski
patent: 3573789 (1971-04-01), Sharp
patent: 3769453 (1973-10-01), Bahl et al.
patent: 3980809 (1976-09-01), Cook
patent: 4013828 (1977-03-01), Judice
patent: 4028731 (1977-06-01), Arps et al.
patent: 4047152 (1977-09-01), Giuliamo et al.
patent: 4144547 (1979-03-01), Stoffel
patent: 4150400 (1979-04-01), Wong

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