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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(3):749-755; doi:10.1093/ietfec/e91-a.3.749
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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

Xiang-Hui WEI1, Shen LI1,2, Yang SONG1 and Satoshi GOTO1

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.


  Abstract

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.


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