Enhanced spatially interleaved DVC using diversity and selective feedback

  • Authors:

  • Nantheera Anantrasirichai;Dimitris Agrafiotis;Dave Bull

  • Affiliations:

  • Department of Electrical&Electronic Engineering, University of Bristol, BS8 IUB, UK;Department of Electrical&Electronic Engineering, University of Bristol, BS8 IUB, UK;Department of Electrical&Electronic Engineering, University of Bristol, BS8 IUB, UK

  • Venue:
  • ICASSP '09 Proceedings of the 2009 IEEE International Conference on Acoustics, Speech and Signal Processing
  • Year:
  • 2009

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Abstract

Systems with cheap/simple/power efficient encoders but complex decoders make applications such as low cost, low power remote sensors practical. Bandwidth considerations however are still an issue and compression efficiency has to remain high. In this paper, we present a distributed video codec (DVC) that we are developing with the aim of achieving such a low power paradigm at the cost of only a small compression performance deficit relative to the current state of the art, H.264. The proposed system employs spatial interleaving of KEY and Wyner-Ziv data which allows efficient side information (SI) generation through block-based error concealment, a Gray code that increases the accuracy of bit probability estimation, and a diversity scheme that produces more reliable results by exploiting multiple SI generated data. Simulation results show an improvement of the proposed scheme over H.264 intra coding of up to 1.5 dB. We additionally propose two mechanisms for selective parity bit feedback requests that can fizrther reduce the WZ bitrate by up to 15%.