Bit allocation algorithm
for codebook design in vector quantization fully based on human visual
system non-linearities for suprathreshold contrasts
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J. Malo, A.M. Pons and J.M. Artigas
Electronics Letters, Vol. 31, Nº
15, pp 1222-1224 (1995) |
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Abstract
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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Keywords: Image coding, Vector
quantization, Human factors.
References: 7 |
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