Improved Dictionaries for Generalized Bitplanes-based Matching Pursuits Video Coding using Ridgelets (MP-P8)

Author(s) : Leonardo Fonteles (Programa de Engenharia Elétrica/COPPE - Universidade Federal do Rio de Janeiro, Brazil) Rogério Caetano (Fundacao Desembargador Paulo Feitoza, Brazil) Eduardo Da Silva (Programa de Engenharia Elétrica/COPPE - Universidade Federal do Rio de Janeiro, Brazil)

Abstract : It has recently been proposed a novel decomposition of functions using generalized bit-planes. Such a decomposition maps a function into a set of indexes, thus performing quantization and signal decomposition in a single step. In a previous work it has been successfully used replacing the decomposition/quantization operations in Neff and Zakhor's matching pursuits video encoder. In this paper we investigate good codebooks for such decompositions whose construction is based on ridgelets. We show that by combining products of properly scaled and rotated ridgelets one can obtain codebooks which provide improved rate X distortion performances. Also, we confirm the theoretical prediction that good codebooks are the ones that have a small maximum angle between any vector in RîN and the closest one in the codebook.

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