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Title: Low complexity H.263 TO H.264 video transcoding using motion vector decomposition
Authors: Fung, KT
Siu, WC 
Issue Date: 2005
Source: Proceedings - IEEE International Symposium on Circuits and Systems, 2005, 1464736, p. 908-911 How to cite?
Abstract: The H.264 adopts various block types and multiple reference frames for motion compensation. For transcoding a video sequence from the H.263 format to the H.264 format, it is beneficial to reuse as much information as possible in the original sequence. It is always a good idea to design a video transcoder which aims at achieving a transcoded video sequence with good quality and lower bitrate, and without introducing high computational complexity during the transcoding process. Motivated by this, an effective motion vector decomposition algorithm is proposed for transcoding videos from the H.263 format to the H.264 format. The algorithm concentrates on macroblocks which consume more bits in the H.263 video sequence. In other words, a non-optimal motion vector is splitted into smaller sizes since the H.264 support various block types. Using the proposed prediction error measure and diversity of the motion vector measure, the motion vector can be decomposed adaptively and the amount of the prediction error can be minimized. After re-estimating the new set of motion vectors, multiple reference frames estimation is applied to further reduce the bitrate and prediction error. Since the non-optimal motion vector can easily be identified inside the proposed transcoder, it is effective to improve the transcoding efficiency to avoid computational redundance. The proposed video transcoder can reduce substantially the amount of computation and provide transcoded videos with better quality as compared with those obtained from the conventional cascaded video transcoder. Experimental results show that 80% of the computation can be saved with a similar transcoded video quality that can be achieved from the conventional cascaded video transcoder.
Description: IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005, Kobe, 23-26 May 2005
ISSN: 0271-4310
DOI: 10.1109/ISCAS.2005.1464736
Appears in Collections:Conference Paper

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