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Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 382369, 14 pages
http://dx.doi.org/10.1155/2012/382369
Research Article

Multiscale Point Correspondence Using Feature Distribution and Frequency Domain Alignment

1School of Control Science and Engineering, Shandong University, Jinan 250061, China
2College of Information and Electrical Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3State Key Lab of Intelligent Technologies and Systems, Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Automation, Tsinghua University, Beijing 100084, China

Received 23 July 2012; Revised 19 November 2012; Accepted 20 November 2012

Academic Editor: Asier Ibeas

Copyright © 2012 Zeng-Shun Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this paper, a hybrid scheme is proposed to find the reliable point-correspondences between two images, which combines the distribution of invariant spatial feature description and frequency domain alignment based on two-stage coarse to fine refinement strategy. Firstly, the source and the target images are both down-sampled by the image pyramid algorithm in a hierarchical multi-scale way. The Fourier-Mellin transform is applied to obtain the transformation parameters at the coarse level between the image pairs; then, the parameters can serve as the initial coarse guess, to guide the following feature matching step at the original scale, where the correspondences are restricted in a search window determined by the deformation between the reference image and the current image; Finally, a novel matching strategy is developed to reject the false matches by validating geometrical relationships between candidate matching points. By doing so, the alignment parameters are refined, which is more accurate and more flexible than a robust fitting technique. This in return can provide a more accurate result for feature correspondence. Experiments on real and synthetic image-pairs show that our approach provides satisfactory feature matching performance.