System for compressing and decompressing binary representations

Details System for compressing and decompressing binary representations System for compressing and decompressing binary representations

1997-09-12

1999-10-12

Rogers, Scott

Image analysis

Image compression or coding

Gray level to binary coding

382243, 382246, 358427, 358429, G06T 900, G06K 946

Patent

active

059664673

ABSTRACT:
A method for compression and decompression of dithered images is disclosed. Logical units (tiles) of the binary representation are classified into equivalence classes which are then compressed. Each equivalence class represents tiles having similar gray levels (i.e. the same number of black pixels), but which may have different sequences of black and white pixels. Each equivalence class has associated with it a predefined set of rendering exemplars. Each of the exemplars has a similar gray level. Upon decompression, each instance of an equivalence class takes on the value of one of the rendering exemplars which is selected pseudo-randomly. This effectively causes the image to be re-dithered so there is no loss of critical image information on decompression

REFERENCES:
patent: 5497434 (1996-03-01), Wilson
patent: 5703965 (1997-12-01), Fu et al.
patent: 5751859 (1998-05-01), Howard
patent: 5754707 (1998-05-01), Knowlton

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