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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2006, Vol. 7 Issue (Supplement 1): 70-75    DOI: 10.1631/jzus.2006.AS0070
Original Paper     
Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi
School of Computer Science, Zhejiang University, Hangzhou 310027, China
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Abstract  A fast mode decision algorithm is proposed in this paper to accelerate the process of transcoding videos into H.264 with arbitrary rate spatial resolution down-scaling. The proposed algorithm consists of three steps. First, an early-stop technique is introduced to determine the 16×16-mode blocks, which take up about 70% of all the macroblocks; then, a bottom-up merging process is performed to determine the mode of rest non-early-stopped blocks; and then, we adopt half-pixel motion estimation to further refine the acquired predictive motion vectors. In order to obtain the predictive motion vectors for early-stop and merging processes, we propose a motion vector composition scheme, which can reuse the information in the input pre-encoded videos to handle the spatial resolution down-scaling. Experimental results showed that our algorithm is about four times faster than the Cascaded-Decoder-Encoder method and has negligible PSNR drop and little bit rate increase.

Key words： Transcoding      H.264      Mode decision      Motion composition     
Received: 15 December 2005     
CLC:  TN919.8  
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Bu Jia-Jun
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Yang Zhi
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Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi. Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2006, 7(Supplement 1): 70-75.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2006.AS0070     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2006/V7/ISupplement 1/70

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