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.
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