Variable-length encoding using code swapping

Details Variable-length encoding using code swapping Variable-length encoding using code swapping

1996-02-28

1999-11-23

Tadayon, Bijan

Image analysis

Image compression or coding

Lossless compression

382232, 382239, 382244, 341 67, 341107, G06K 936, G06K 946, H03U 740, H03U 700

Patent

active

059914513

ABSTRACT:
The efficiency of variable-length (VL) encoding data using a defined VL encoding table is characterized and one or more changes to one or more entries of the defined VL encoding table are determined that increase the efficiency of encoding the data. An updated VL encoding table is generated from the defined VL encoding table based on the changes. VL codes for the data are generated using the updated VL encoding table, and an encoded bitstream is generated from VL codes, wherein the encoded bitstream explicitly identifies the changes. For decoding, the changes are extracted from the encoded bitstream and an updated VL decoding table is generated from a defined VL decoding table corresponding to the defined VL encoding table, based on the changes. The VL codes in the encoded bitstream are decoded using the updated VL decoding table to generate a set of decoded data.

REFERENCES:
patent: 5793896 (1998-08-01), Golin

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