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Exploitation d'images numériques pour la simplification et la déformation de modèles polyédriques

Abstract : Polyhedral models which are very often used in mechanical design, constitute a privileged representation among the digital mock-ups of products. On the one hand, the approaches and methods of manipulation and exploitation of these models are usually led by one geometric criterion linked to the objects' shape (normal, curvature ...) but only a few of them pay attention to perceptual information. On the other hand, the existing image processing techniques extract data (contours, geometric features, textures...) related to the objects' shapes description they represent. Thus, the goal of this Ph.D. is to perform a coupling between polyhedral 3D models and 2D digitalized image(s) in order to handle these models with image-based criteria. One simplification and two deformation methods are presented. In the first one, the simplification is based on a vertex removal iterative process led by a tolerance criterion: it is linked to images contours filtering which are projected onto the 3D model to identify areas which are more or less close to those character lines. The polyhedrons deformation methods are applied to the hole-filling case. A triangulation is inserted and deformed by an optimization problem under constraints resolution. The function to minimize simulates the curvature variation between the inserted patch and the initial model. The solution is obtained by an iterative algorithm based on a mechanical model of bars network. The constraints come either from the respect of 3D character lines obtained by stereoscopic triangulation or directly from the intensity of the pixels to constrain the vertices displacement to a certain elevation (inverse Shape From Shading problem). The three developed methods are completely modular.
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https://pastel.archives-ouvertes.fr/pastel-00005131
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Tuesday, June 23, 2009 - 8:00:00 AM
Last modification on : Monday, March 30, 2020 - 8:44:53 AM
Long-term archiving on: : Saturday, November 26, 2016 - 8:29:17 PM

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  • HAL Id : pastel-00005131, version 1

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Minica Panchetti. Exploitation d'images numériques pour la simplification et la déformation de modèles polyédriques. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2009. Français. ⟨NNT : 2009ENAM0004⟩. ⟨pastel-00005131⟩

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