Method and apparatus for encoding and decoding images

Details Method and apparatus for encoding and decoding images Method and apparatus for encoding and decoding images

1997-06-27

2000-11-07

Couso, Von J.

Image analysis

Image compression or coding

Adaptive coding

G06K 936

Patent

active

061447714

ABSTRACT:
A method is disclosed for adaptive entropy coding and decoding of a stream of indices representative of information, including the following steps: establishing, at both an encoder and a decoder, respective coding tables to have codes corresponding to indices; finding, in the encoder table, codes corresponding to indices of the stream of indices, and sending the found codes to the decoder for recovery of the indices corresponding to the sent codes; determining an overall frequency of occurrence of individual indices in the stream of indices; determining a measure of how currently individual indices have occurred in the stream of indices; and adaptively modifying the encoder and decoder tables in accordance with the measure of how currently individual indices have occurred and the frequency of occurrence.

REFERENCES:
patent: 4589142 (1986-05-01), Bednar
patent: 5257328 (1993-10-01), Shimizu
patent: 5659631 (1997-08-01), Gormish et al.
patent: 5748780 (1998-05-01), Stolfo
patent: 5799110 (1998-08-01), Israelsen et al.
patent: 5822465 (1998-10-01), Normile et al.
patent: 5889891 (1999-03-01), Gersho et al.

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