Low-Complexity Coarse-Level Mode-Mapping Based H.264/AVC to H.264/SVC Spatial Transcoding for Video Conferencing

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著者

    • SUN Lei
    • the Graduate School of Information, Production and Systems, Waseda University
    • LENG Jie
    • the Graduate School of Information, Production and Systems, Waseda University
    • SU Jia
    • the Graduate School of Information, Production and Systems, Waseda University
    • IKENAGA Takeshi
    • the Graduate School of Information, Production and Systems, Waseda University

抄録

Scalable Video Coding (SVC) was standardized as an extension of H.264/AVC with the intention to provide flexible adaptation to heterogeneous networks and different end-user requirements, which provides great scalability in multi-point applications such as video conferencing. However, due to the existence of H.264/AVC-based systems, transcoding between AVC and SVC becomes necessary. Most existing works focus on temporal transcoding, quality transcoding or SVC-to-AVC spatial transcoding while the straightforward re-encoding method requires high computational cost. This paper proposes a low-complexity AVC-to-SVC spatial transcoder based on coarse-level mode mapping for video conferencing scenes. First, to omit unnecessary motion estimations (ME) for layers with reduced resolution, an ME skipping scheme based on AVC mode distribution is proposed with an adaptive search range. Then a probability-profile based scheme is proposed for further mode skipping. After that 3 coarse-level mode-mapping methods are presented for fast mode decision and the adaptive usage of the 3 methods is discussed. Finally, motion vector (MV) refinement is introduced for further lower-layer time reduction. As for the top layer, direct encapsulation is proposed to preserve better quality and another scheme involving inter-layer predictions is also provided for bandwidth-crucial applications. Simulation results show that proposed transcoder achieves up to 92.6% time reduction without significant coding efficiency loss compared to re-encoding method.

収録刊行物

  • IEICE transactions on information and systems

    IEICE transactions on information and systems 95(5), 1313-1323, 2012-05-01

    一般社団法人 電子情報通信学会

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被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10030942708
  • NII書誌ID(NCID)
    AA10826272
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09168532
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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