This paper addresses the problem of estimating the Potts parameter β jointly with the unknown parameters of a Bayesian model within a Markov chain Monte Carlo (MCMC) algorithm. Standard MCMC methods cannot be applied to this problem because performing inference on β requires computing the intractable normalizing constant of the Potts model. In the proposed MCMC method, the estimation of β is conducted using a likelihood-free Metropolis-Hastings algorithm. Experimental results obtained for synthetic data show that estimating β jointly with the other unknown parameters leads to estimation results that are as good as those obtained with the actual value of β. On the other hand, choosing an incorrect value of β can degrade estimation performance significantly. To illustrate the interest of this method, the proposed algorithm is successfully applied to real bidimensional SAR and tridimensional ultrasound images.
Estimating the Granularity Coefficient of a Potts-Markov Random Field Within a Markov Chain Monte Carlo Algorithm
M. Pereyra,N. Dobigeon,H. Batatia,J. Tourneret
Published 2012 in IEEE Transactions on Image Processing
ABSTRACT
PUBLICATION RECORD
- Publication year
2012
- Venue
IEEE Transactions on Image Processing
- Publication date
2012-07-23
- Fields of study
Mathematics, Computer Science, Medicine
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- External record
- Source metadata
Semantic Scholar, PubMed
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