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Optical Engineering

Fast mode decision algorithm in MPEG-2 to H.264/AVC transcoding including group of picture structure conversion
Author(s): Kangjun Lee; Gwanggil Jeon; Jechang Jeong
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Paper Abstract

The H.264/AVC baseline profile is used in many applications, including digital multimedia broadcasting, Internet protocol television, and storage devices, while the MPEG-2 main profile is widely used in applications, such as high-definition television and digital versatile disks. The MPEG-2 main profile supports B pictures for bidirectional motion prediction. Therefore, transcoding the MPEG-2 main profile to the H.264/AVC baseline is necessary for universal multimedia access. In the cascaded pixel domain transcoder architecture, the calculation of the rate distortion cost as part of the mode decision process in the H.264/AVC encoder requires extremely complex computations. To reduce the complexity inherent in the implementation of a real-time transcoder, we propose a fast mode decision algorithm based on complexity information from the reference region that is used for motion compensation. In this study, an adaptive mode decision process was used based on the modes assigned to the reference regions. Simulation results indicated that a significant reduction in complexity was achieved without significant degradation of video quality.

Paper Details

Date Published: 1 May 2009
PDF: 11 pages
Opt. Eng. 48(5) 057003 doi: 10.1117/1.3127198
Published in: Optical Engineering Volume 48, Issue 5
Show Author Affiliations
Kangjun Lee, Hanyang Univ. (Korea, Republic of)
Gwanggil Jeon, Hanyang Univ. (Korea, Republic of)
Jechang Jeong, Hanyang Univ. (Korea, Republic of)


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