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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/1932

Title: A feature-assisted search strategy for block motion estimation
Authors: Chan, Yui-lam
Siu, Wan-chi
Subjects: Edge detection
Feature extraction
Image matching
Image sequences
Motion estimation
Search problems
Video signal processing
Issue Date: 1999
Publisher: IEEE
Citation: 1999 International Conference on Image Processing : ICIP '99 : proceedings : 24-28 October, 1999, Kobe, Japan, v. 2, p. 620-624.
Abstract: Block motion estimation using the exhaustive full search is computationally intensive. Previous fast search algorithms tend to reduce the computation by limiting the number of locations to be searched. Nearly all of these algorithms rely on the assumption: the MAD distortion function increases monotonically as the search location moves away from the global minimum. Unfortunately, this is usually not true in real-world video signals. However, we can reasonably assume that it is monotonic in a small neighbourhood around the global minimum. Consequently, one simple, but perhaps the most efficient and reliable strategy, is to put the checking point as close as possible to the global minimum. In this paper, some image features are suggested to locate the initial search points. Such a guided scheme is based on the location of some feature points. After a feature detecting process was applied to each frame to extract a set of feature points as matching primitives, we studied extensively the statistical behaviour of these matching primitives and found that they are highly correlated with the MAD error surface of real-world motion vectors. These correlation characteristics are extremely useful for fast search algorithms. The results are robust and the implementation could be very efficient.
Description: DOI: 10.1109/ICIP.1999.822969
Rights: © 1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Type: Conference Paper
URI: http://hdl.handle.net/10397/1932
ISBN: 0-7803-5467-2
Appears in Collections:EIE Conference Papers & Presentations

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