Title :
Scene adaptive vector quantization
Author_Institution :
Aachen Univ. of Technol., West Germany
Abstract :
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
Keywords :
data compression; encoding; picture processing; 8*8 blocks; activity; classification; dimension; discrete cosine transform; edge detector; energy concentration; frequency response; gain/shape-separation; human visual system; image coding; masking effect; multistage technique; scene adaptive VQ-scheme; supra-threshold DCT-coefficients; threshold value; thresholding DCT-transformed block components; vector quantization;
Conference_Titel :
Image Processing and its Applications, 1989., Third International Conference on
Conference_Location :
Warwick
