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US 6,205,252 B1Granted
Two channel HVQ (hierarchical vector quantization) compression
AssigneeXerox Corporation
InventorsUoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Sang-chul Kang, Chia-hao Lee
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Abstract
A compression process of dividing each word to be compressed into least and most significant bits, and applying a different compression ratio to each. If the compression processes are lossy, both parts of the output can also be losslessly compressed before being output. Hierarchical vector quantization can be issued for either lossy compressor.
Claims3
A process of compressing an original word having a plurality of bits comprising the steps of:
- splitting the word into the most significant bits and the least significant bits,
- first compressing the least significant bits in a first lossy compressor,
- second compressing the most significant bits in a second lossy compressor, wherein the first and second compression ratios are different, and
- combining the compressed most and least significant bits to form an output word.
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