Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-11-21
1985-12-10
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358262, 382 56, 340744, 340793, H04N 140, G09G 114, G09G 300, G06K 936
Patent
active
045583706
ABSTRACT:
Graphics images are generally considered to be those images comprised of text and/or line drawings. Data compression of graphics images is desired whenever a fast image transmission speed is desired in a limited band width channel. It is also used for storage of a large number of images in a limited capacity storage system. The method and apparatus described herein improves data compression, resolution and coding efficiency by eliminating transitions between gray levels at edges in an image, converting all gray levels to a common value to achieve a 3 level representation of a graphics image, and reversibly converting the 3 level representation to a bilevel double resolution representation by increasing the data sampling rate and therefore allowing the use of two level data compression techniques. A high resolution display or printed output may be obtained from the bilevel multiresolution representation.
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Mitchell Joan L.
Pennebaker William B.
Britton Howard W.
Clark George E.
Dowd Thomas P.
International Business Machines - Corporation
Peng John K.
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