Pyramid coder with nonlinear prediction. Laurent Meunier Antoine Manens. Framework. No quantization : lossless coding Open-loop = Closed-loop Ideal VLC coder for each level of the pyramid. Criteria. Global compression rate of the pyramid
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Improvement can be obtained on specific visual patterns like edges
More complicated to analyse.
Reduce and Expand Filters chosen from intuition/experiments, no guarantee of optimality.
Implementation : the algorithm switches technique depending on the type of neighborhood. Use a training set to learn decision table.
Burt&Adelson with a = 0.6