Academic literature on the topic 'Squelettisation topologique'
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Dissertations / Theses on the topic "Squelettisation topologique":
Lohou, Christophe. "Contribution à l'analyse topologique des images : étude d'algorithmes de squelettisation pour images 2D et 3D selon une approche topologie digitale ou topologie discrète." Marne-la-Vallée, 2001. http://www.theses.fr/2001MARN0120.
This thesis proposes new thinning algorithms for 2D or 3D images according to two approaches using either the digital topology or the discrete topology. In the first part, we recall some fundamental notions of digital topology and several thinning algorithms amongs the well-known ones, which delete simple points. Then, we propose a methodology to produce new thinning algorithms based on the parallel deletion of P-simple points. Such algorithms are conceived in order to they delete at least the points removed by another one given existent thinning algorithm. By applying this methodology, we produce two new algorithms. Although results seem to be satisfying, the proposal and encoding of new proposed algorithms are not easy. In the second part, we use the concept of partially order set (or poset). We propose more straightforwardly than before, a thinning algorithm consisting in the repetition of parallel deletion of αn-simple points, followed by the parallel deletion of βn-simple points. We also have proposed new definitions of end points which permit us to obtain either curve skeletons or surface skeletons. The thinning scheme is used on 2D, 3D binary images, or on 2D grayscale images. At last, a study of a parallel filtering of skeletons is developped
Bancora, Simone. "Characterization of fabric layups by pressure print analysis and simulation of dual-scale flow based on topological skeletonization : application to composite materials processing." Thesis, Ecole centrale de Nantes, 2021. http://www.theses.fr/2021ECDN0049.
In this work, we study continuous fiber preforms in the context of Resin Transfer Moulding (RTM) processes. The aim of the thesis is two-fold: propose a new methodology to obtain mesoscale geometrical data from preforms and provide a new numerical model able to predict permeability or perform mesoscale filling simulations in a computationally efficient way. In the first part, the focus is on the acquisition of geometrical data from preforms: we propose a novel methodology based on the analysis of the pressure field experienced by a dry preform under compaction. By using a commercial pressure-sensitive film, the pressure field exerted by a stack of layers against mould walls is captured and analyzed. Taking advantage of the periodic morphology of textiles, geometric patterns revealed by the pressure field are interpreted according to spectral Moiré analysis to recover the orientation and spatial distribution of each individual layer in the stack. In the second part, the reconstructed digital architecture of the preform is used to carry out numerical flow simulations at the scale of the yarns, to characterize permeability of the stack or directly perform filling simulations. The stack geometry is replaced by a skeletonized representation of the same, on which a two-dimensional flow problem can be solved numerically, greatly reducing the computational cost when compared to a full 3D approach. This “medial skeleton” model is first formulated in its single-scale version (flow in channels) and then extended to dual-scale (flow in channels and yarns). The model potential is illustrated through several test cases. This research establishes a pathway going from the non-destructive acquisition of data to the simulation of the dual-scale flow inside a multi-layer layup of textiles
Plougonven, Erwan. "Lien entre la microstructure des matériaux poreux et leur perméabilité : Mise en évidence des paramètres géométriques et topologiques influant sur les propriétés de transport par analyses d'images microtomographiques." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00440189.
Chaussard, John. "Topological tools for discrete shape analysis." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00587411.
Durix, Bastien. "Squelettes pour la reconstruction 3D : de l'estimation de la projection du squelette dans une image 2D à la triangulation du squelette en 3D." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19589/1/durix.pdf.
Plougonven, Erwan Patrick Yann. "Lien entre la microstructure des matériaux poreux et leur perméabilité : mise en évidence des paramètres géométriques et topologiques influant sur les propriétés de transport par analyses d’images microtomographiques." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13847/document.
The objective of this work is to develop 3D image analysis tools to study the micronic pore structure of porous materials, obtained by X-ray microtomography, and study the relation between microgeometry and macroscopic transport properties. From a binarised image of the pore space, a complete sequence of processing (artefact filtration, skeletonisation, watershed, etc. ) is proposed for positioning and delimiting the pores. A comparison with available methods is performed, and a methodology to qualify the robustness of these processes is presented. The decomposition is used, firstly for extracting geometric parameters of the porous microstructure and studying the relation with intrinsic permeability; secondly to produce a simplified pore network on which to perform numerical simulations
Raynal, Benjamin. "Applications of digital topology for real-time markerless motion capture." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00597513.