Vector quantization
From Free net encyclopedia
In data compression, vector quantization is a quantization technique often used in lossy data compression in which the basic idea is to code or replace with a key, values from a multidimensional vector space into values from a discrete subspace of lower dimension.
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Explanation
The lower-space vector requires less storage space and the data is thus compressed. The transformation into the subspace is usually achieved through projection, or by using a codebook. In some cases, a codebook implementation can be also used to entropy code the discrete value in the same step by generating a prefix coded variable-length encoded value as its output.
Twin vector quantization (VQF) is part of the MPEG-4 standard dealing with time domain weighted interleaved vector quantization.
Video codecs based on vector quantization
Audio codecs based on vector quantization
See also
- speech coding
- Ogg Vorbis
- Voronoi diagram
- rate-distortion function
- data clustering
- Learning Vector Quantization
Part of this article was originally based on material from the Free On-line Dictionary of Computing and is used with permission under the GFDL.