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Optical Engineering

Self-control of quantizer risk attitude in rational embedded wavelet image coding
Author(s): Jose Antonio Garcia; Rosa Rodriguez-Sanchez; Joaquin Fdez-Valdivia DUPLICATE RECORD - Do Not; Javier Martinez
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Paper Abstract

In the absence of a priori knowledge about regions of interest, a rational system for progressive transmission chooses at any truncation time among alternative spatial orientation trees for further transmission, in such a way as to avoid certain forms of behavioral inconsistency. Some rational transmission systems might exhibit aversion to risk involving "gambles" on the tree-dependent quality of encoding, while others favor taking such risks, but risk-prone systems as well as those with strong risk aversion appear incapable of attaining the quality of reconstructions that can be achieved with moderately risk-averse behavior. Even though the problem of estimating the parameter that controls the risk attitude in a rational transmission system is a key issue, it is not clear how to pick the risk aversion parameter for different image content. We estimate the risk aversion parameter by integrating rationality and cooperative action with the aim of preventing disproportionately large benefit gains and strong oscillations in gain at very low bit rates. Experimental results show the comparative performance of the corresponding transmission system with both the state of the art in progressive transmission set partitioning in hierarchical trees (SPIHT) and the state of art coder JPEG2000.

Paper Details

Date Published: 1 November 2003
PDF: 20 pages
Opt. Eng. 42(11) doi: 10.1117/1.1615989
Published in: Optical Engineering Volume 42, Issue 11
Show Author Affiliations
Jose Antonio Garcia, Univ. de Granada (Spain)
Rosa Rodriguez-Sanchez, Univ. de Granada (Spain)
Joaquin Fdez-Valdivia DUPLICATE RECORD - Do Not, Univ. de Granada (Spain)
Javier Martinez, Univ. de Granada (Spain)


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