Image compression method and apparatus employing distortion adaptive tree search vector quantization with avoidance of transmission of redundant image data
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United States of America Patent
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Sep 21, 1993
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app pub date -
Nov 19, 1991
filing date -
May 31, 1989
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Abstract
A variable rate vector quantization apparatus and method employs a tree structured codebook. Code vectors are selected from different levels of the codebook according to the value of a threshold. The value of the threshold is periodically adjusted according to the fullness of a buffer that stores vector quantized data to be transmitted. According to the invention, vector quantized data for redundant, or similar, vectors is not transmitted. Rather, a 'copy last vector' instruction is transmitted for these vectors to achieve further data compression. A method of mean removal from vectors to be vector quantized is also disclosed.
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