A fast video transcoder from Wyner-Ziv to AVS

  • Authors:

  • Aiguo Yi;Xianming Liu;Xiaopeng Fan;Debin Zhao

  • Affiliations:

  • Department of Computer Science, Harbin Institute of Technology, Harbin, China;Department of Computer Science, Harbin Institute of Technology, Harbin, China;Department of Computer Science, Harbin Institute of Technology, Harbin, China;Department of Computer Science, Harbin Institute of Technology, Harbin, China

  • Venue:
  • PCM'10 Proceedings of the Advances in multimedia information processing, and 11th Pacific Rim conference on Multimedia: Part II
  • Year:
  • 2010

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Abstract

As well known, Wyner-Ziv codec has low encoding complexity, while AVS codec has low decoding complexity. In this paper, our goal is to get benefits from both AVS and Wyner-Ziv to fit well some applications, such as mobile video communication. We propose a fast video transcoder from Wyner-Ziv to AVS. The transcoder design aims at reducing encoding complexity of AVS. Taking into account that mode decision in AVS is very time-consuming, in the proposed scheme, we discard the mode decision and directly re-use the corresponding decision results of Wyner-Ziv decoder. At the same time, motion estimation in AVS encoder is speeded up by using the derived motion vectors in Wyner-Ziv decoder as searching origins. Then motion vector refinement is performed to further improve the accuracy of motion estimation in the transcoder. Experimental results demonstrate that the proposed transcoder can significantly reduce the encoding complexity of AVS, and meanwhile provide close compression performance compared with that can be achieved by performing mode decision and a full-scale motion search.