Arithmetic coding context model that accelerates adaptation for

Details Arithmetic coding context model that accelerates adaptation for Arithmetic coding context model that accelerates adaptation for

1997-04-09

1999-03-23

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from code based on probability

H03M 700

Patent

active

058866558

ABSTRACT:
The present invention provides improved compression ratios for small data sets with only a minor impact of the compression ration of larger data sets by rapidly tracking the statistics at the beginning of the compression run, slowing down to a traditional pace as the size increases. This is accomplished by limiting the size of the probability table at the start. As more data passes through the compressor, the size of the table is expanded. The size of the probability is controlled by gradually opening the context window for limited number of bytes at the beginning of the data set.

REFERENCES:
patent: 4901363 (1990-02-01), Toyokawa
patent: 5045852 (1991-09-01), Mitchell et al.
patent: 5710562 (1998-01-01), Gormish et al.

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