Mr. Muhannad A. Al-Hasan Profile

Muhannad A. Al-Hasan

at Univ of East Anglia Norwich

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Proceedings Article | 20 April 2005 Paper

Image registration using a weighted region adjacency graph

Muhannad Al-Hasan, Mark Fisher

Proceedings Volume 5745, (2005) https://doi.org/10.1117/12.595336

KEYWORDS: Image registration, Image segmentation, Medical imaging, Magnetic resonance imaging, Image processing, Machine vision, Computer vision technology, Brain, 3D image processing, Single photon emission computed tomography

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Image registration is an important problem for image processing and computer vision with many proposed applications in medical image analysis.^{1, 2} Image registration techniques attempt to map corresponding features between two images. The problem is particularly difficult as anatomy is subject to elastic deformations. This paper considers this problem in the context of graph matching. Firstly, weighted Region Adjacency Graphs (RAGs) are constructed from each image using an approach based on watershed saliency. ³ The vertices of the RAG represent salient regions in the image and the (weighted) edges represent the relationship (bonding) between each region. Correspondences between images are then determined using a weighted graph matching method. Graph matching is considered to be one of the most complex problems in computer vision, due to its combinatorial nature. Our approach uses a multi-spectral technique to graph matching first proposed by Umeyama⁴ to find an approximate solution to the weighted graph matching problem (WGMP) based on the singular value decomposition of the adjacency matrix. Results show the technique is successful in co-registering 2-D MRI images and the method could be useful in co-registering 3-D volumetric data (e.g. CT, MRI, SPECT, PET etc.).

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