A vector quantization scheme using prequantizers of human visual effects

摘要

In this paper, a new human visual system, which considers the Weber's law, spatial masking effect, and Mach band effect in the gray level domain, is applied to the vector quantization (VQ) scheme. Since the new human visual system only requires to look up a ROM table to prequantize the image for performing a transformation from the gray level to the index of the prequantizer, it simplifies the VQ process and reduces the computation. The simulation results indicate that the results of the vector quantization with the new human visual system is better than those with the conventional VQ and classified VQ no matter in the bit-rate or the quality of the reconstructed images.