Side information improvement in transform-domain distributed video coding

A. Abou-Elailah; G. Petrazzuoli; J. Farah; M. Cagnazzo; B. Pesquet-Popescu; F. Dufaux

doi:10.1117/12.930620

15 October 2012 Side information improvement in transform-domain distributed video coding

A. Abou-Elailah, G. Petrazzuoli, J. Farah, M. Cagnazzo, B. Pesquet-Popescu, F. Dufaux

Proceedings Volume 8499, Applications of Digital Image Processing XXXV; 84990K (2012) https://doi.org/10.1117/12.930620
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Side Information (SI) has a strong impact on the rate-distortion performance in distributed video coding. The quality of the SI can be impaired when the temporal distance between the neighboring reference frames increases. In this paper, we introduce two novel methods that allow improving the quality of the SI. In the first approach, we propose a new estimation method for the initial SI using backward and forward motion estimation. The second one consists in re-estimating the SI after decoding all WZFs within the current Group of Pictures (GOP). For this purpose, the SI is first successively refined after each decoded DCT band. Then, after decoding all WZFs within the GOP, we adapt the search area to the motion content. Finally, each already decoded WZF is used, along with the neighboring ones, to estimate a new SI closer to the original WZF. This new SI is then used to reconstruct again the WZF with better quality. The experimental results show that, compared to the DISCOVER codec, the proposed method reaches an improvement of up to 3.53 dB in rate-distortion performance (measured with the Bjontegaard metric) for a GOP size of 8.

Citation Download Citation

A. Abou-Elailah, G. Petrazzuoli, J. Farah, M. Cagnazzo, B. Pesquet-Popescu, and F. Dufaux "Side information improvement in transform-domain distributed video coding", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84990K (15 October 2012); https://doi.org/10.1117/12.930620

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