The need for adapting video stream delivery over heterogeneous and unreliable networks requires self-adaptive and error resilient\ncoding.Network bandwidth fluctuations can be handled by means of a video coding scheme which adapts to the channel conditions.\nHowever, packet losses which are frequent in wireless networks can cause a mismatch during the reconstruction in the receiver end\nand result in an accumulation of errors which deteriorates the quality of the delivered video. A combination of multiple description\ncoding in pixel domain and scalable video coding schemes which addresses both video adaptation and robustness to data loss\nis proposed in this paper. The proposed scheme combines error concealment with spatial video scalability. In order to improve\nthe fidelity of the reconstructed to the original frames in presence of packet loss, a multilayer poly phase spatial decomposition\nalgorithm is proposed. Classica multiple description methods interpolate the missing data which results in smoothing and artifact\nat object boundaries. The proposed algorithm addresses the quality degradation due to low-pass filtering effect of interpolation\nmethods.We also comparatively analyze the trade-off between robustness to channel errors and coding efficiency.
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