The Role of Perceptual Contrast Non-Linearities in Image Transform Quantization (1999)
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BibTeX
@MISC{Malo99therole,
author = {J. Malo and F. Ferri and J. Albert and J. Soret and J.M. Artigas},
title = {The Role of Perceptual Contrast Non-Linearities in Image Transform Quantization},
year = {1999}
}
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Abstract
Introduction According to the well-known image transform coding paradigm, an appropriate transformation of the signal is carried out prior to the quantization stage to simplify the quantizer design. Given a certain transform (usually a local frequency transform), two intimately related problems must be solved. The first problem is to decide how to distribute quantization levels in the amplitude 1 Partially supported by CICYT projects TIC98-677-C02-02 and TIC 1FD97-279. 19 July 1999 range of each transform coefficient. The second problem is to determine the number of quantization levels that will be devoted to each coefficient. The first is usually known as 1D quantizer design and the second is often referred to as bit allocation. It is widely accepted that for image coding applications that are judged by a human observer, the properties and limitations of the human visual system (HVS) have to be taken into account
