2006 IEEE International Conference on Multimedia and Expo
A Fast Downsizing Video Transcoder for H.264/AVC with Rate-Distortion Optimal Mode Decision
Toronto, ON, Canada
July 09-July 12
ISBN: 1-4244-0366-7
Huifeng Shen, University of Science&Technology of China. shenhf@mail.ustc.edu.cn
Xiaoyan Sun, Microsoft Research Asia. xysun@microsoft.com
Feng Wu, Microsoft Research Asia. fengwu@microsoft.com
Houqiang Li, University of Science&Technology of China. lihq@ustc.edu.cn
Shipeng Li, Microsoft Research Asia. spli@microsoft.com
This paper focuses on the mode decision and motion selection problem when H.264/AVC video streams are transcoded in spatial resolution. A fast downsizing transcoding scheme is developed in which a new rate-distortion (R-D) optimal mode decision mechanism is presented for high speed transcoding as well as high coding efficiency. A model for estimating relative prediction errors is applied in this paper, which is free from computation of interpolation and SAD/SSD computation. Based on the selected model, a motion refinement within a distance of 1 pixel is performed after mode decision. Experimental results demonstrate that our method can significantly speed up the spatial resolution reduction process, while achieving high coding efficiency.
Citation:
Huifeng Shen, Xiaoyan Sun, Feng Wu, Houqiang Li, Shipeng Li, "A Fast Downsizing Video Transcoder for H.264/AVC with Rate-Distortion Optimal Mode Decision," icme, pp.2017-2020, 2006 IEEE International Conference on Multimedia and Expo, 2006
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