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A Videoconferencing-Oriented Hybrid-Domain H.264/SVC to H.264/AVC Spatial Transcoder

  • Lei Sun
  • Zhenyu Liu
  • Takeshi Ikenaga
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7674)

Abstract

As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous requirements. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity SVC-to-AVC spatial transcoder in hybrid domain (pixel domain & transform domain) with drift compensation. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and MV refinement. In the transform-domain transcoding, the quantized transform coefficients together with motion data are reused directly to avoid re-quantization loss. At last, the drift problem in proposed transcoder is solved. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.

Keywords

SVC-to-AVC transcoding spatial scalability hybrid-domain drift compensation videoconferencing 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Lei Sun
    • 1
  • Zhenyu Liu
    • 2
  • Takeshi Ikenaga
    • 1
  1. 1.Graduate School of Information, Production and SystemsWaseda UniversityKitakyushu-shiJapan
  2. 2.Tsinghua National Laboratory for Information Science and TechnologyTsinghua UniversityBeijingChina

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