Reconnaissance et correspondance de formes 3D pour des systèmes intelligents de vision par ordinateur

Abstract : This thesis concerns recognition and matching of 3D shapes for intelligent computer vision systems. It describes two main contributions to this domain. The first contribution is an implementation of a new shape descriptor built on the basis of the spectral geometry of the Laplace-Beltrami operator; we propose an Advanced Global Point Signature (AGPS). This descriptor exploits the intrinsic structure of the object and organizes its information in an efficient way. In addition, AGPS is extremely compact since only a few eigenpairs were necessary to obtain an accurate shape description. The second contribution is an improvement of the wave kernel signature; we propose an optimized wave kernel signature (OWKS). The refinement is with a modified particle swarm optimization heuristic algorithm to better match a query to other shapes belonging to the same class in the database. The proposed approach significantly improves the discriminant capacity of the signature. To assess the performance of the proposed approach for nonrigid 3D shape retrieval, we compare the global descriptor of a query to the global descriptors of the rest of shapes in the dataset using a dissimilarity measure and find the closest shape. Experimental results on different standard 3D shape benchmarks demonstrate the effectiveness of the proposed matching and retrieval approaches in comparison with other state-of-the-art methods.
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Seif Eddine Naffouti. Reconnaissance et correspondance de formes 3D pour des systèmes intelligents de vision par ordinateur. Vision par ordinateur et reconnaissance de formes [cs.CV]. Université Bourgogne Franche-Comté; École nationale d'Ingénieurs de Monastir (Tunisie), 2018. Français. ⟨NNT : 2018UBFCK033⟩. ⟨tel-02119477⟩

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