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Proceedings Paper

A fast intra 4x4 mode decision algorithm for H.264/AVC down rate transcoding
Author(s): Zhihang Wang; Luhong Liang; Shengfu Dong; Wen Gao; Debin Zhao; Qingming Huang
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Paper Abstract

H.264/AVC adopts 9 intra 4×4 prediction modes to improve the intra frame compression efficiency. This makes the intra frame coding and transcoding very complex. In this paper, a fast intra 4×4 mode decision algorithm is proposed to reduce the intra transcoding complexity. Firstly, the surrounding modes in the high bitrate and the modes of the neighboring blocks in the current bitrate are used to form the candidate modes. Secondly, the variance and mean of the intra prediction residual are used to further reduce the size of the candidate mode set. Thirdly, the intra mode context model is built from the high bitrate modes and updated by the low bitrate modes to order the candidate modes. An early skip scheme is used to terminate the mode decision process. Experimental results show that about 50% intra 4×4 modes can be saved with a penalty on coding efficiency less than 0.1dB. The transcoding performance can even gain up to 0.6 dB on some sequences.

Paper Details

Date Published: 4 August 2010
PDF: 8 pages
Proc. SPIE 7744, Visual Communications and Image Processing 2010, 77442H (4 August 2010); doi: 10.1117/12.863464
Show Author Affiliations
Zhihang Wang, Institute of Computing Technology (China)
Luhong Liang, Institute of Computing Technology (China)
Shengfu Dong, Peking Univ. (China)
Wen Gao, Peking Univ. (China)
Debin Zhao, Harbin Institute of Technology (China)
Qingming Huang, Graduate Univ. of the Chinese Academy of Sciences (China)

Published in SPIE Proceedings Vol. 7744:
Visual Communications and Image Processing 2010
Pascal Frossard; Houqiang Li; Feng Wu; Bernd Girod; Shipeng Li; Guo Wei, Editor(s)

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