| Date: Friday, August 22, 2003 Time: 11:00 AM Location: Research building III- Room # 130 Speaker: Marie Rochery Title: Higher order active contours and their application to the detection of line networks in satellite imagery Abstract: I will present a novel method for the incorporation of shape information into active contour models, and apply it to the extraction of line networks from satellite imagery. The method is based on a new class of contour energies. These energies are quadratic on the space of one-chains in the image, as opposed to classical energies, which are linear. They can be expressed as double integrals on the contour, and thus incorporate non-trivial interactions between different contour points. The new energies describe families of contours that share complex geometric properties. We model line networks with a particular choice of quadratic energy whose minima is reticulated. To optimize the energies, the level set approach is used. The forces derived from the new energies are non-local however, thus necessitating an extension of standard level set methods. Promising experimental results are obtained using real images.
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