Hierarchical Chamfer Matching: A Parametric Edge Matching Algorithm
IEEE Transactions on Pattern Analysis and Machine Intelligence
IEEE Transactions on Pattern Analysis and Machine Intelligence
Automatic retinal image registration scheme using global optimization techniques
IEEE Transactions on Information Technology in Biomedicine
Matching of complex patterns by energy minimization
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
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In this paper, a novel fusing method for fundus retinal images based on robust registration techniques is proposed. In order to construct precise fusion map, we apply a ‘coarse-to-fine’ mapping strategy to accurately align pairs of identified vascular trees of retinas. A coarse mapping algorithm that exploits rigid model is first performed to maximize the goodness of fit between the vascular features over two time periods. However, the results suffer from local misalignment due to the inherent imprecise characteristics of the simplified model. A fine mapping algorithm is employed to eliminate ‘ghost vessels’ based on a local elastic matching technique. The transformed vectors for pixels in the registered fundus image are conveniently calculated by combining the local move vector and the global model transformed vector. Experiment results demonstrate nearly perfect fusion maps of several retinal fundus images in terms of visual inspection.