Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7213
Title: A spatially-constrained normalized gamma process prior
Authors: Korkinof, Dimitrios 
Demiris, Yiannis 
Chatzis, Sotirios P. 
Korkinof, Dimitrios 
Demiris, Yiannis 
Keywords: Computer science
Artificial intelligence
Expert systems (Computer science)
Markov random fields
Issue Date: 2012
Publisher: Elsevier
Source: Expert systems with applications, 2012, Volume 39, Issue 17, Pages 13019–13025
Abstract: In this work, we propose a novel nonparametric Bayesian method for clustering of data with spatial interdependencies. Specifically, we devise a novel normalized Gamma process, regulated by a simplified (pointwise) Markov random field (Gibbsian) distribution with a countably infinite number of states. As a result of its construction, the proposed model allows for introducing spatial dependencies in the clustering mechanics of the normalized Gamma process, thus yielding a novel nonparametric Bayesian method for spatial data clustering. We derive an efficient truncated variational Bayesian algorithm for model inference. We examine the efficacy of our approach by considering an image segmentation application using a real-world dataset. We show that our approach outperforms related methods from the field of Bayesian nonparametrics, including the infinite hidden Markov random field model, and the Dirichlet process prior
URI: http://ktisis.cut.ac.cy/handle/10488/7213
ISSN: 0957-4174
DOI: 10.1016/j.eswa.2012.05.097
Rights: © 2012 Elsevier Ltd. All rights reserved
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