Open loop transcoding using perceptually adaptive requantization of DCT coefficients

Authors:
Francesco Bertagnolli;Matteo Lanati;Lorenzo Favalli;Francesco Gruppi
Affiliations:
University of Pavia, Pavia, Italy;University of Pavia, Pavia, Italy;University of Pavia, Pavia, Italy;University of Pavia, Pavia, Italy
Venue:
MobiMedia '06 Proceedings of the 2nd international conference on Mobile multimedia communications
Year:
2006

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Abstract

With increasing network heterogeneity, adaptive techniques for coding multimedia (and mainly video) signals become mandatory. In this paper we introduce a simple techniques to adapt quantization step size in an open loop transcoder based on a perceptual interpretation of DCT coefficient distribution. Results show that the technique is actually very simple and despite this simplicity, effective in improving the (trans-) coded stream quality.