Apparatus and method for data compressibility test

Details Apparatus and method for data compressibility test Apparatus and method for data compressibility test

2007-08-28

2007-08-28

Dang, Duy M. (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S232000, C341S051000

Reexamination Certificate

active

10328167

ABSTRACT:
An encoder may have a compressed mode in which a stream of input characters may be encoded into code words. The encoder may have a transparent mode in which the output stream is substantially identical to the input stream. The encoder may switch from one mode to the other based at least in part upon a data compressibility test. The test may comprise comparing an N-segment sliding average of the number of bits required by the encoder in compressed mode to represent a segment of a fixed number of characters to the number of bits required by the encoder in transparent mode to represent the segment.

REFERENCES:
patent: 5177480 (1993-01-01), Clark
patent: 5648773 (1997-07-01), Guy
patent: 6289130 (2001-09-01), Cooklev
The International Telegraph and Telephone Consultative Committee, Data Communication Over the Telephone Network V.42 bls, Geneva 1990.

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