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CLC number: TN919.8

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Received: 2005-12-15

Revision Accepted: 2006-02-17

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Cited: 3

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Journal of Zhejiang University SCIENCE A 2006 Vol.7 No.100 P.70~75

http://doi.org/10.1631/jzus.2006.AS0070


Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264


Author(s):  Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi

Affiliation(s):  School of Computer Science, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   molin@zju.edu.cn

Key Words:  Transcoding, H.264, Mode decision, Motion composition


Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi. Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264[J]. Journal of Zhejiang University Science A, 2006, 7(100): 70~75.

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author="Bu Jia-Jun, Mo Lin-Jian, Chen Chun, Yang Zhi",
journal="Journal of Zhejiang University Science A",
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doi="10.1631/jzus.2006.AS0070"
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%T Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
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%A Mo Lin-Jian
%A Chen Chun
%A Yang Zhi
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%I Zhejiang University Press & Springer
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T1 - Fast mode decision algorithm for spatial resolutions down-scaling transcoding to H.264
A1 - Bu Jia-Jun
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2006.AS0070


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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] Ahmad, I., Wei, X.H., Sun, Y., Zhang, Y.Q., 2005. Video transcoding: An overview of various techniques and research issues. IEEE Trans. on Multimedia, 7(5):793-804.

[2] Chang, A., Wong, P.H.W., Yeung, Y.M., Au, O.C., 2004. Fast multi-block selection for H.264 video coding. Inter. Sym. Circuits and Systems, 3:817-820.

[3] Kucukgoz, M., Sun, M.T., 2004. Early-stop and Motion Vector Re-using for MPEG-2 to H.264 Transcoding. Inter. Conf. SPIE-IS&T Electronic Imaging.

[4] Shanableh, T., Ghanbari, M., 2000. Heterogeneous video transcoding to lower spatial-temporal resolutions and different encoding formats. IEEE Trans. on Multimedia, 2(2):101-110.

[5] Takahashi, K., Satoch, K., Suzuki, T., Yagasaki, Y., 2001. Motion Vector Synthesis Algorithm for MPEG2-to-MPEG4 Transcoder. SPIE―The International Society for Optical Engineering, 4301:872-882.

[6] Tu, Y.K., Yang, J.F., Shen, Y.N., Sun, M.T., 2003. Fast variablesize block motion estimation using merging procedure with an adaptive threshold. Inter. Conf. Multimedia and Expo., 2:789-792.

[7] Xin, J., Sun, M.T., Choi, B.S., Chun, K.W., 2002. An HDTV-to-SDTV spatial transcoder. IEEE Trans. on Circuits and Systems for Video Technology, 12(11): 998-1008.

[8] Zhou, Z., Sun, M.T., Hsu, S., 2004. Fast variable block-size motion estimation algorithms based on merge and split procedures for H.264/MPEG-4 AVC. Inter. Sym. Circuits and Systems, 3:725-728.

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