Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Special Section on Signal Processing for Audio and Visual Systems and Its Implementations -- Papers -- Image Coding and Video Coding |
An Irregular Search Window Reuse Scheme for MPEG-2 to H.264 Transcoding
1 The authors are with the Graduate School of Information, Production and Systems, Waseda University, Kitakyushu-shi, 808-0135 Japan. E-mail: wxh{at}ruri.waseda.jp, 2 Presently, with the Digital Multimedia SoC R&D Center, Toshiba Corp.
Motion estimation (ME) is a computation-intensive module in video coding system. In MPEG-2 to H.264 transcoding, motion vector (MV) from MPEG-2 reused as search center in H.264 encoder is a simple but effective technique to simplify ME processing. However, directly applying MPEG-2 MV as search center will bring difficulties on application of data reuse method in hardware design, because the irregular overlapping of search windows between successive macro block (MB). In this paper, we propose a search window reuse scheme for transcoding, especially for HDTV application. By utilizing the similarity between neighboring MV, overlapping area of search windows can be regularized. Experiment results show that our method achieves average 93.1% search window reuse-rate in HDTV720p sequence with almost no video quality degradation. Compared to transcoding method without any data reuse scheme, bandwidth of the proposed method can be reduced to 40.6% of that.
Key Words: MPEG-2 to H.264 transcoding, motion estimation, search window reuse
Manuscript received July 6, 2007. Manuscript revised October 18, 2007.
Reference
[1] J. Xin, C.W. Lin, and M.T. Sun, "Digital video transcoding," Proc. IEEE, vol.93, no.1, pp.84–97, Jan. 2005. [2] I. Ahmad, X.H. Wei, Y. Sun, and Y.Q. Zhang, "Video transcoding: An overview of various techniques and research issues," IEEE Trans. Multimed., vol.7, no.5, pp.793–804, Oct. 2005. [3] X. Lu, A.M. Tourapis, P. Yin, and J. Boyce, "Fast mode decision and motion estimation for H.264 with a focus on MPEG-2/H.264 transcoding," Proc. IEEE International Symposium on Circuits and Systems, vol.2, no.1, pp.1246–1249, May 2005. [4] Z. Zhou, S. Sun, S. Lei, and M.T. Sun, "Motion information and coding mode reuse for MPEG-2 to H.264 transcoding," Proc. IEEE International Symposium on Circuits and Systems, vol.2, no.1, pp.1230–1233, May 2005. [5] J.C. Tuan, T.S. Chang, and C.W. Jen, "On the data reuse and memory bandwidth analysis for full-search block-matching VLSI architecture," IEEE Trans. Circuits Syst. Video Technol., vol.12, no.1, pp.61–72, Jan. 2002. [6] C.Y. Chen, C.T. Huang, Y.H. Chen, and L.G. Chen, "Level C+ data reuse scheme for motion estimation with corresponding coding orders," IEEE Trans. Circuits Syst. Video Technol., vol.16, no.4, pp.553–558, April 2006. [7] http://www.mpeg.org/MSSG/ [8] http://iphome.hhi.de/suehring/tml/ [9] J. Xin, A. Vetro, S. Sekiquchi, and K. Suqimoto, "Motion and mode mapping for MPEG-2 to H.264/AVC transcoding," Proc. IEEE International Conference on Multimedia and Expo, vol.1, no.1, pp.313–316, July 2006.
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