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International Journal of Biomedical Imaging
Volume 2010, Article ID 906067, 13 pages
http://dx.doi.org/10.1155/2010/906067
Research Article

Retinal Fundus Image Registration via Vascular Structure Graph Matching

1School of Electronic Engineering, Xidian University, Xi'an, Shanxi 710071, China
2Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China

Received 21 May 2010; Accepted 7 July 2010

Academic Editor: Ge Wang

Copyright © 2010 Kexin Deng 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

Motivated by the observation that a retinal fundus image may contain some unique geometric structures within its vascular trees which can be utilized for feature matching, in this paper, we proposed a graph-based registration framework called GM-ICP to align pairwise retinal images. First, the retinal vessels are automatically detected and represented as vascular structure graphs. A graph matching is then performed to find global correspondences between vascular bifurcations. Finally, a revised ICP algorithm incorporating with quadratic transformation model is used at fine level to register vessel shape models. In order to eliminate the incorrect matches from global correspondence set obtained via graph matching, we proposed a structure-based sample consensus (STRUCT-SAC) algorithm. The advantages of our approach are threefold: (1) global optimum solution can be achieved with graph matching; (2) our method is invariant to linear geometric transformations; and (3) heavy local feature descriptors are not required. The effectiveness of our method is demonstrated by the experiments with 48 pairs retinal images collected from clinical patients.