Document Type
Conference Proceeding
Publication Date
2007
Journal or Book Title
AIP Conference Proceedings
Volume
894
First Page
709
Last Page
716
DOI
10.1063/1.2718040
Abstract
We derive a hierarchical Bayesian method for identifying elliptically‐shaped regions with elevated signal levels in NDE images. We adopt a simple elliptical parametric model for the shape of the defect region and assume that the defect signals within this region are random following a truncated Gaussian distribution. Our truncated‐Gaussian model ensures that the signals within the defect region are higher than the baseline level corresponding to the noise‐only case. We derive a closed‐form expression for the kernel of the posterior probability distribution of the location, shape, and defect‐signal distribution parameters (model parameters). This result is then used to develop Markov chain Monte Carlo (MCMC) algorithms for simulating from the posterior distributions of the model parameters and defect signals. Our MCMC algorithms are appliedsequentially to identify multiple potential defect regions. For each potential defect, we construct Bayesian confidence regions for the estimated parameters. Estimated Bayes factors are utilized to rank potential defects (discovered by our sequential scheme) according to goodness of fit. The performance of the proposed methods is demonstrated on experimental ultrasonic C‐scan data from an inspection of a cylindrical titanium billet.
Rights
Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Copyright Owner
American Institute of Physics
Copyright Date
2007
Language
en
File Format
application/pdf
Recommended Citation
Dogandžić, Aleksandar and Zhang, Benhong, "Markov Chain Monte Carlo Defect Identification in NDE Images" (2007). Electrical and Computer Engineering Publications. 42.
https://lib.dr.iastate.edu/ece_pubs/42
Included in
Applied Statistics Commons, Electrical and Computer Engineering Commons, Engineering Physics Commons, Theory and Algorithms Commons
Comments
The following article appeared in AIP Conference Proceedings 894 (2007): 709 and may be found at doi:10.1063/1.2718040.