Coding and decoding methods and apparatus for compressing and ex

Details Coding and decoding methods and apparatus for compressing and ex Coding and decoding methods and apparatus for compressing and ex

1997-03-03

1999-06-22

Boudreau, Leo H.

Image analysis

Image compression or coding

382181, G06K 900

Patent

active

059150424

ABSTRACT:
An image is divided into blocks of N consecutive pixels, and each block is coded with reference to M reference pixels, where M and N are integers greater than one. Different patterns of N pixels are obtained from the M reference pixels. If one of these patterns matches the N consecutive pixels sufficiently closely, that block of N consecutive pixels is coded as a flag and a pattern code. When the coded data are decoded, the flags identify blocks that were coded in this way, and these blocks are decoded by copying already-decoded data identified by the pattern codes.

REFERENCES:
patent: 5218457 (1993-06-01), Burkardt et al.
patent: 5313204 (1994-05-01), Semasa et al.
patent: 5491564 (1996-02-01), Hongu

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