Scene adaptive vector quantization

A scene adaptive VQ-scheme for 8*8 blocks is proposed. The dimension is reduced by thresholding DCT-transformed block components. A classification in activity and energy concentration as well as an edge detector is used for setting the threshold value. Supra-threshold DCT-coefficients are quantized by several vector quantizers using gain/shape-separation and a multistage technique. Both the frequency response and the masking effect of the human visual system are utilized by the VQ.<
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