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
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