Vector

Adaptive vector quantization

Adaptive vector quantization
  1. What is meant by vector quantization?
  2. What is adaptive codebook?
  3. What is the difference between vector quantization and scalar quantization?

What is meant by vector quantization?

Vector quantisation (VQ) is the assignment of one code word to a group of two or more picture elements. Compression is achieved through the number of available code words being less than the number of permutations of the possible values of the input pels in the group.

What is adaptive codebook?

The adaptive codebook consists of the excitation vectors from the previous frame. Each time a new excitation vector is obtained, it is added to the codebook. In this manner, the codebook adapts to local statistics.

What is the difference between vector quantization and scalar quantization?

In scalar quantization, a scalar value is selected from a finite list of possible values to represent a sample. In vector quantization, a vector is selected from a finite list of possible vectors to represent an input vector of samples.

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