A fast intra 4x4 mode decision algorithm for H.264/AVC down rate transcoding

Zhihang Wang; Luhong Liang; Shengfu Dong; Wen Gao; Debin Zhao; Qingming Huang

doi:10.1117/12.863464

4 August 2010 A fast intra 4×4 mode decision algorithm for H.264/AVC down rate transcoding

Zhihang Wang, Luhong Liang, Shengfu Dong, Wen Gao, Debin Zhao, Qingming Huang

Proceedings Volume 7744, Visual Communications and Image Processing 2010; 77442H (2010) https://doi.org/10.1117/12.863464
Event: Visual Communications and Image Processing 2010, 2010, Huangshan, China

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.

Citation Download Citation

Zhihang Wang, Luhong Liang, Shengfu Dong, Wen Gao, Debin Zhao, and Qingming Huang "A fast intra 4×4 mode decision algorithm for H.264/AVC down rate transcoding", Proc. SPIE 7744, Visual Communications and Image Processing 2010, 77442H (4 August 2010); https://doi.org/10.1117/12.863464

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