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This paper addresses the problem of transmitting real-time video over wireless networks. We propose improvements to multiple description coding technique using the slice group coding tools provided in H.264/AVC. The Macroblocks in each frame are mapped into different slice groups based on their motion vectors and distortion parameters. The slice group containing significant motion and distortion is fine quantized, while the other slice group is coarse quantized. The encoded quality scaled video is transmitted normally over the first path, but with a quantization offset on the second path. The proposed system provides a better quality video for the regions containing interesting targets. Simulation results in Network Simulator NS-2 confirm robust performance of the scheme under different packet loss conditions.
Date of Conference: 29-31 Oct. 2007