Bit allocation algorithm for codebook design in vector quantization fully based on human visual system non-linearities for suprathreshold contrasts

A fully perceptual oriented approach for codebook design in image vector quantization for compression purposes is presented. The proposed algorithm not only exploits the usually considered dependence on frequency of the human eye, but also makes use of the non-linear behaviour of the human visual system for suprathreshold contrasts. From experimental data of human contrast incremental thresholds of sinusoidal grids, we present a perceptually optimal information allocation function. Simulations show that by introducing perceptual contrast non-uniformities, a more efficient bit allocation is attained than for the JPEG-like contrast uniform algorithm.
 

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