New dictionaries for matching pursuits video coding

"Matching pursuits" is a signal expansion technique whose efficiency for video coding has already been demonstrated in the MPEG-4 community. In this paper, we focus our attention on some aspects of the algorithm. Firstly, the relevance of the orthogonalization of the signal expansion is investigated. Secondly, a subband dictionary is proposed as an alternative to the Gabor dictionary, used up to now. Equivalent levels of quality are achieved with both dictionaries but the computational cost is significantly reduced when using the subband one. Eventually, the entropy coding stage of the algorithm is studied.