Title: Half tone encoder/decoder

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.

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Inventors: Stoffel, James C. (Rochester, NY, US)

Application Number: 784206
Filing Date: 1977-04-04
Publication_date: 1980-03-11
Assignee: Xerox Corporation (Stamford, CT)
Primary Class(es): 382/238 358/426.12, 375/240.12, 375/240.24
Other Classes:
US Patent Ref:

3462547	Aug, 1969	Macovski	358/133.
3573789	Apr, 1971	Sharp	340/146.
3769453	Oct, 1973	Bahl et al.	358/260.
3980809	Sep, 1976	Cook	358/260.
4013828	Mar, 1977	Judice	358/133.
4028731	Jun, 1977	Arps et al.	358/260.
4047152	Sep, 1977	Giuliamo et al.	340/146.
4144547	Mar, 1979	Stoffel	358/260.
4150400	Apr, 1979	Wong	358/138.

Other Refs:
Primary Examiner: Griffin, Robert L.
Assistant Examiner: Coles, Edward L.
Attorney: