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Definition of "vector quantization (VQ)" |
quantization applied to vectors or blocks of outputs of a continuous source. Each possible source block is represented by a reproduction vector chosen from a finite set (the “codebook”). According to rate distortion theory, vector quantization (VQ) is able to perform arbitrarily close to the theoretical optimum if the lengths of the input blocks are permitted to grow without limit. The method was suggested by Claude Shannon in his theoretical work on source coding (during the late 1940s and the 1950s), but has found practical importance first in recent years (during the 1980s and 1990s) because of the relatively high complexity of implementation and design compared to scalar methods. Also referred to as “block source coding with a fidelity criterion.” |
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