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Title: Priority search technique for MPEG-4 motion estimation of arbitrarily shaped video object
Authors: Hui, Ko-cheung
Chan, Yui-lam
Siu, Wan-chi
Subjects: MPEG-4
Video coding
Video object planes
Boundary macroblock
Opaque macroblock
Block motion estimation
Issue Date: 2001
Publisher: IEEE
Source: 2001 International Conference on Image Processing : ICIP : proceedings : 7-10 October, 2001, Thessaloniki, Greece, p. 644-647.
Abstract: One of the main differences between the MPEG-4 video and the previously standardized video coding schemes is the support of arbitrarily shaped video objects, for which most of the existing fast motion estimation algorithms are not suitable. The conventional fast motion estimation algorithm works well for opaque macroblocks, but not the case for a boundary macroblock which contains a large number of local minima on its error surface. In this paper, we propose a fast search algorithm which incorporates the binary alpha-plane to predict accurately the motion vectors of boundary macroblocks. Besides, these accurate motion vectors can be used to develop a novel priority search algorithm which is an efficient search strategy for the remaining opaque macroblocks. Experimental results show that, when compared to the conventional methods, our approach requires a low computational complexity and provides a significant improvement in terms of accuracy in motion-compensated video object planes.
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Type: Conference Paper
ISBN: 0-7803-6725-1
Appears in Collections:EIE Conference Papers & Presentations

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