Systems Seminar

Higher-Order Active Contours

Ian Jermyn
Ariana
INRIA, Sophia Antipolis

Abstract

This talk will describe a new class of active contour models, higher-order polynomial energies, that hold great promise for region and shape modelling. The distinctive feature of the new class of models is that different points of the contour interact with each other in ways that depend on the contour geometry, and that may depend on the data. The result is that the new energies can incorporate non-trivial prior information about geometry, their minima representing families of contours sharing complex geometric properties. However, unlike most current attempts to incorporate geometric information into contour energies, these models do not describe only small, tangential variations around a 'mean' shape, and they are automatically translation and rotation invariant. In addition, new data energies can correlate the contour with the data in ways that are impossible using classical models.

Off-the-shelf contour energy minimization methods do not apply directly to the new models, necessitating an extension of existing level set methods to deal with the non-local forces that arise.

An example of an energy in this class, consisting of a prior term whose minima bear a strong resemblance to networks of interest in several types of imagery, and a data term illustrating the possibilities inherent in the new energies, will be described. A number of results will be shown, some illustrating the prior behaviour of the contour in the absence of data, and others showing the results obtained so far in the extraction of road networks from optical satellite images.

This is joint work with Marie Rochery and Josiane Zerubia.

Time and Place: Mon., Aug. 23, at 3:30 pm in 4610 Engr. Hall.       *** NOTE SPECIAL DAY ***

SYSTEMS SEMINAR WEB PAGE: http://homepages.cae.wisc.edu/~gubner/seminar/

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