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In vector quantization (VQ), the original image is first decomposed into n-dimensional image vectors. The vectors can be generated in a number of different ways. For example, an n=l x m block of pixel values can be ordered to form an n-dimensional vector, or a 3-dimensional vector can be formed from the RGB color components of an individual pixel. The image may also be modified prior to forming the vectors, e.g., by the application of a DCT with the transform coefficients used as the vector components.
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