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  4. Using an exponential power model for Wyner-Ziv video coding
 
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conference paper

Using an exponential power model for Wyner-Ziv video coding

Maugey, Thomas
•
Gauthier, Jérôme
•
Pesquet-Popescu, Béatrice
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2010
2010 IEEE International Conference on Acoustics, Speech and Signal Processing
IEEE, International Conference on Acoustic, Speech and Signal Processing

The Laplacian model is the standard distribution for correlation noise estimation at the turbodecoder in Wyner-Ziv coding schemes. In practice, this hypothesis is not always satisfied and, regularly, the estimated model sensibly differs from the error distribution. In this work, we prove that using a model better fitted to the true distribution improves the performances, and we thus propose to use the more general exponential power distribution (EPD) which has never been tested in a distributed video coding context. Gains in rate-distortion over the Laplacian model are illustrated by results on several video sequences, showing that the EPD model outperforms the Laplacian one in off-line (oracle) as well as in on-line (practical implementation) modes. These results also indicate that, in some cases, the on- line EPD model reduces the bitrate even over the off-line Laplacian model.

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