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Contours actifs d´ordre supérieur et leur application à la détection de linéiques dans des images de télédétection

Marie Rochery 1
1 ARIANA - Inverse problems in earth monitoring
CRISAM - Inria Sophia Antipolis - Méditerranée , Laboratoire I3S - SIS - Signal, Images et Systèmes
Abstract : This thesis addresses the question of how to introduce prior knowledge about the shape of an object to be detected in the general framework of object recognition from images. We illustrate this idea with the problem of line network extraction from satellite and aerial images. We use the framework of active contours and we introduce a whole new class of active contours, named "higher-order active contours". This class allows us to define new models that incorporate sophisticated prior geometric knowledge describing, rather than a specific shape, a general family of shapes. We first study a particular case of a geometric quadratic energy that favours network structures composed of arms of roughly constant width joined at junctions. This energy demonstrates the modelling possibilities offered by the new class of active contours. The geometric quadratic energy is added to the linear terms length and area, and is used as a geometric prior for the line network extraction models we propose. Several image terms are defined, one of them being a quadratic term linking the geometry of contour points and the data. A model for extraction in presence of occlusions is also presented. In order to minimize these energies, we develop an algorithm based on the level set methodology. The non-local forces of the gradient descent equation are computed on the extracted contour, before being extended to the whole domain. Finally, in order to solve certain difficulties with both standard active contours and the new models, we propose to use phase field models to model regions. They offer an advantageous alternative to classical techniques and we define line network extraction models similar to higher-order active contours in that framework. All proposed models are tested on real satellite and aerial images.
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Submitted on : Friday, October 14, 2005 - 11:12:18 AM
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Marie Rochery. Contours actifs d´ordre supérieur et leur application à la détection de linéiques dans des images de télédétection. Traitement du signal et de l'image [eess.SP]. Université Nice Sophia Antipolis, 2005. Français. ⟨tel-00010631⟩

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