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Issue No.03 - March (2013 vol.35)
pp: 682-696
R. Cuingnet , Philips Res., Medisys, Suresnes, France
Joan Alexis Glaunes , Sorbonne Paris Cite, Univ. Paris Descartes, Paris, France
M. Chupin , Equipe Cogimage-CRICM, Paris, France
H. Benali , Fac. de Med., Lab. d'Imagerie Fonctionnelle (LIF), Univ. Pierre et Marie Curie, Paris, France
O. Colliot , Equipe Cogimage-CRICM, Paris, France
This paper presents a framework to introduce spatial and anatomical priors in SVM for brain image analysis based on regularization operators. A notion of proximity based on prior anatomical knowledge between the image points is defined by a graph (e.g., brain connectivity graph) or a metric (e.g., Fisher metric on statistical manifolds). A regularization operator is then defined from the graph Laplacian, in the discrete case, or from the Laplace-Beltrami operator, in the continuous case. The regularization operator is then introduced into the SVM, which exponentially penalizes high-frequency components with respect to the graph or to the metric and thus constrains the classification function to be smooth with respect to the prior. It yields a new SVM optimization problem whose kernel is a heat kernel on graphs or on manifolds. We then present different types of priors and provide efficient computations of the Gram matrix. The proposed framework is finally applied to the classification of brain Magnetic Resonance (MR) images (based on Gray Matter (GM) concentration maps and cortical thickness measures) from 137 patients with Alzheimer's Disease (AD) and 162 elderly controls. The results demonstrate that the proposed classifier generates less-noisy and consequently more interpretable feature maps with high classification performances.
Support vector machines, Laplace equations, Kernel, Manifolds, Brain models, neuroimaging, SVM, regularization, Laplacian, Alzheimer's disease
R. Cuingnet, Joan Alexis Glaunes, M. Chupin, H. Benali, O. Colliot, "Spatial and Anatomical Regularization of SVM: A General Framework for Neuroimaging Data", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.35, no. 3, pp. 682-696, March 2013, doi:10.1109/TPAMI.2012.142
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