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Multiresolution image classification by hierarchical modeling with two-dimensional hidden Markov models

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3 Author(s)
Jia Li ; Xerox Palo Alto Res. Center, CA, USA ; Gray, R.M. ; Olshen, R.A.

This paper treats a multiresolution hidden Markov model for classifying images. Each image is represented by feature vectors at several resolutions, which are statistically dependent as modeled by the underlying state process, a multiscale Markov mesh. Unknowns in the model are estimated by maximum likelihood, in particular by employing the expectation-maximization algorithm. An image is classified by finding the optimal set of states with maximum a posteriori probability. States are then mapped into classes. The multiresolution model enables multiscale information about context to be incorporated into classification. Suboptimal algorithms based on the model provide progressive classification that is much faster than the algorithm based on single-resolution hidden Markov models

Published in:

Information Theory, IEEE Transactions on  (Volume:46 ,  Issue: 5 )

Date of Publication:

Aug 2000

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