Academic literature on the topic 'Reconstruction d’image 3D'
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Journal articles on the topic "Reconstruction d’image 3D":
Bonnel, F. "Apport de l’impression 3D (méthode additive) dans la planification et la correction des troubles statiques complexes du pied et de la cheville : méthodologie et applications chirurgicales." Médecine et Chirurgie du Pied 36, no. 1 (March 2020): 21–30. http://dx.doi.org/10.3166/mcp-2020-0041.
Galo, Mauricio, Antonio M. G. Tommaselli, and Júlio K. Hasegawa. "The influence of subpixel measurement on digital camera calibration." Revue Française de Photogrammétrie et de Télédétection, no. 198-199 (April 21, 2014): 62–70. http://dx.doi.org/10.52638/rfpt.2012.73.
Dissertations / Theses on the topic "Reconstruction d’image 3D":
Courchay, Jérôme. "Calibration par programmation linéaire et reconstruction spatio-temporelle à partir de réseaux d’images." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1014/document.
The issue of retrieving a 3D shape from a static scene captured with multiple view point calibrated cameras has been deeply studied these last decades. Results presented in the stereovision benchmark made by Strecha et al., show the high quality of state of the art methods. Particularly, works from IMAGINE laboratory lead to impressive results. So, it becomes convenient to calibrate wider and wider scenes, in order to apply these stereovision algorithms to large scale scenes. Three main objectives appear : – The calibration accuracy should be improved. As stated by Yasutaka Furukawa, even stereovision benchmarks use noisy cameras. So one obvious way to improve stereovision, is to improve camera calibration. – It is crucial to take cycles into account in cameras graph in a global way. Most of nowadays methods are sequential and so present a drift. So these methods do not offer the guarantee to retrieve the loopy configuration for a loop made of a high number of images, but retrieve a spiral configuration. As we aim to calibrate wider and wider cameras networks, this point becomes quite crucial. – To calibrate wide cameras networks, having quick and linear algorithms can be necessary. Calibration methods we propose in the first part, allow to calibrate with an accuracy close to state of the art. Moreover, we take cyclicity constraints into account in a global way, with linear optimisations under linear constraints. So these methods allow to take cycle into account and benefit from quickness of linear programming. Finally, sterovision being a well studied topic, it is convenient to concentrate on the next step, that is, spatio-temporal reconstruction. The IMAGINE' stereovision method being the state of the art, it is interesting to extend this method to spatio-temporal reconstruction, that is, dynamique scene reconstruction captured from a dome of cameras
Ait, Assou Manal. "Synthetic aperture imaging and spectroscopy in the terahertz range using time domain spectroscopy system." Electronic Thesis or Diss., Limoges, 2024. https://aurore.unilim.fr/theses/nxfile/default/437c1676-13e9-4b65-9ff5-95b93ac02ca3/blobholder:0/2024LIMO0008.pdf.
Les techniques d'imagerie et de spectroscopie térahertz offrent de vastes applications dans le control non destructif ou le contrôle de qualité dans la manufacture industrielle, la pharmaceutique et la biologie, l'archéologie ou encore le monde de l’art. Pour ces applications, la technique de spectroscopie térahertz dans le domaine temporel (THz-TDS) permet une analyse sur une bande passante instantanée très large (0.1-6 THz), mais nécessite généralement de déplacer mécaniquement l’échantillon à imager dans le plan focal du faisceau THz. Le travail de cette thèse porte sur l’adaptation d’un banc THz-TDS pour l’imagerie et la spectroscopie des échantillons fixes, en se basant sur le principe d’un radar à synthèse d’ouverture (SAR), en transmission. En utilisant cette technique, on démontre une reconstruction d'image en 3D avec une résolution inférieure au millimètre de plusieurs échantillons différents. Pour remédier au temps d'acquisition prolongés, un échantillonnage spatial lacunaire est proposé, réduisant les éléments du réseau synthétique et améliorant la vitesse d'acquisition. De plus, les données reconstruites ne sont pas uniquement utilisées pour l'imagerie mais permettent également la caractérisation des paramètres optiques matériaux (l'indice de réfraction et le coefficient d'absorption) constituant l'objet imagé dans la bande de fréquence de reconstruction. Ainsi, la technique proposée permet la cartographie spectrale 2D de l'indice de réfraction à diverses fréquences térahertz. Enfin, la méthodologie proposée est appliquée à l'imagerie de sortie de guide d'ondes térahertz, illustrant sa grande flexibilité et ses vastes domaine potentielles d’utilisation
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.
Ding, Yanzheng. "Une analyse d’images pour l'identification microstructurale en 3D d’un kaolin saturé sous chargement mécanique." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0051.
AbstractMicrostructure investigation is essential for a better understanding of the mechanical behaviour and volumetric deformation mechanisms of remolded and saturated clays. The goal of this thesis is to identify in 3D the local mechanisms which can be activated at the microstructural level in relation to the mechanical loading of clayey meida. The mechanical behaviour of Kaolin k13 is firstly studied at on two loading paths - oedometric and isotropic. Then, an observation protocol was established for the acquisition of three-dimensional images using Scanning Electron Microscopy (SEM) coupled with Focused Ion Beam (FIB). The reconstruction of the images obtained by FIB-SEM allows us to study the 3D geometry of a sub-volume of the sample. The second part consists of developing a quantitative analysis approach in 3D to identify the microstructure properties on different loading paths. The pore morphology is studied using parameters such as flatness, elongation, and sphericity. The orientation of the pores and particles was first identified on 2D images representing cross-sections in the sample and extended to 3D throughout the entire volume for both loading paths. The results obtained in this thesis highlight the contribution of 3D images for a better understanding of the microstructure of saturated remolded clays
Zein, Sara. "Simulations Monte Carlo des effets des photons de 250 keV sur un fantôme 3D réaliste de mitochondrie et évaluation des effets des nanoparticules d'or sur les caractéristiques des irradiations." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC036/document.
In the field of radiobiology, damage to nuclear DNA is extensively studied since it is considered as a sensitive target inside cells. Mitochondria are starting to get some attention as sensitive targets as well since they control many functions important to the cell’s survival. They are double membraned organelles mainly in charge of energy production as well as reactive oxygen species regulation, cell signaling and apoptosis control. Some experiments have shown that after exposure to ionizing radiation the mitochondrial contents are altered and their functions are affected. That is why we are interested in studying the effects of ionizing radiation on mitochondria. At the microscopic scale, Monte Carlo simulations are helpful in reproducing the tracks of ionizing particles for a close study. Therefore, we produced 3D phantoms of mitochondria starting from microscopic images of fibroblast cells. These phantoms are easily uploaded into Geant4 as tessellated and tetrahedral meshes filled with water representing the realistic geometry of these organelles. Microdosimetric analysis is performed to deposited energy by 250keV photons inside these phantoms. The Geant4-DNA electromagnetic processes are used to simulate the tracking of the produced secondary electrons. Since clustered damages are harder to repair by cells, a clustering algorithm is used to study the spatial clustering of potential radiation damages. In radiotherapy, it is a challenge to deliver an efficient dose to the tumor sites without affecting healthy surrounding tissues. The use of gold nanoparticles as radio-sensitizers seems to be promising. Their high photon absorption coefficient compared to tissues deposit a larger dose when they are preferentially absorbed in tumors. Since gold has a high atomic number, Auger electrons are produced abundantly. These electrons have lower range than photoelectrons enabling them to deposit most of their energy near the nanoparticle and thus increasing the local dose. We studied the radio-sensitizing effect of gold nanoparticles on the mitochondria phantom. The effectiveness of this method is dependent on the number, size and spatial distribution of gold nanoparticles. After exposure to ionizing radiation, reactive oxygen species are produced in the biological material that contains abundant amount of water. In this study, we simulate the chemical species produced inside the mitochondria phantom and their clustering is estimated. We take advantage of the Geant4-DNA chemistry processes libraries that is recently included in the Geant4.10.1 release to simulate the spatial distribution of the chemicals and their evolution with time
Quijano, Sergio. "Contribution à la reconstruction 3D des membres inférieurs reconstruits à partir des radios biplanes pour l’application à la planification et au suivi des chirurgies." Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0032/document.
For a better understanding and diagnosis of the pathologies affecting the spatialorganization of our skeleton it is necessary to address them in 3D. CT-Scan and MRI areimaging modalities commonly used to study the musculoskeletal system in 3D. Moreover,patients are recorded in reclining position thus gravity effect can’t be taken into account.Furthermore, CT-Scan exposes patient to high radiation doses and MRI is used mostly tocharacterize soft tissues. With the EOS system, from a pair of low dose biplanar radiographs wecan reconstruct bones in 3D, and the radiographs are recorded in standing position thus gravityeffects are considered. This thesis contributes to the improvement of the 3D reconstructionmethods of lower limbs from biplanar radiographs. In this thesis we have proposed andevaluated: 1) A 3D reconstruction method of the lower limbs based on parametric models andstatistical inferences. 2) A method for the auto-improvement of the 3D reconstruction of thelower limbs. This method combines image processing and the recalculation of the statisticalinferences. 3) Finally, methods based on similarity measures and shape criteria were used todetect automatically the medial and lateral side of the femur and tibia. The aim of thesemethods is to avoid the inversion of the femoral and tibial condyles in biplanar radiographs.These inversions have an impact in the calculation of clinical measurements, particularly thetorsional ones. The reconstruction method proposed in this thesis is already integrated withinthe sterEOS® software, available in 60 hospitals around the world. The methods developed inthis thesis have led us to a semi-automatic, accurate and robust reconstruction of lower limbs
Marre, Guilhem. "Développement de la photogrammétrie et d'analyses d'images pour l'étude et le suivi d'habitats marins." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG012.
In a context of climate change and the erosion of marine biodiversity, ecological monitoring of the most sensitive marine habitats is of paramount importance. In particular, there is a need for operational methods that enable decision-makers and managers to establish relevant conservation measures and to evaluate their effectiveness. TEMPO and RECOR are two monitoring networks focusing on Posidonia meadows and coralligenous reefs, the two richest and most sensitive habitats in the Mediterranean. The objective of this thesis is to meet the needs of effective monitoring of marine habitats by developing methods for assessing their health, based on two key image analysis methods: convolutional neural networks and photogrammetry. The results show that convolutional neural networks are capable of recognizing the main species of coralligenous assemblages in underwater photographs from RECOR, with a precision similar to that of an expert taxonomist. Furthermore, we have shown that photogrammetry can reproduce a marine habitat in three dimensions with a high degree of accuracy, sufficient for monitoring habitat structure and species distribution at a fine scale. Based on these reconstructions, we have developed a method for automatic mapping of Posidonia meadows, enabling temporal monitoring of the ecological quality of this sensitive habitat. Finally, we characterized the three-dimensional structure of coralligenous reefs based on their photogrammetric reconstructions and studied the links with the structuring of the assemblages that make them up. This PhD work has led to the development of operational methods that are now integrated into the TEMPO and RECOR monitoring networks. Results of this work paves the way for future research, in particular concerning characterization of the biological activity of coralligenous reefs thanks to the coupling of photogrammetry, neural networks and underwater acoustics
Llucia, Ludovic. "Suivi d'objets à partir d'images issues de caméras mobiles non calibrées." Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22009/document.
This work refers to a 3D simulator that has for purpose to help football trainers interpreting tactical sequences based on real situations. This simulator has to be able to interpret video movies, to reconstruct a situation. The camera’s calibration state has to be as simple as possible. The first part of this document refers to the solution elaborated to implement this constraint whereas the second one is more oriented on the industrialisation process. These processes imply to focus on vision computing and ergonomics problems and to answer questions such as : how to characterize a homographic transformation matching the image and the model ? How to retrieve the position of the camera? Which area is part of the image? In an ergonomically point of view, the simulator has to reproduce the game play reality and to improve the abstraction and the communication of the coaches
Bugarin, Florian. "Vision 3D multi-images : contribution à l’obtention de solutions globales par optimisation polynomiale et théorie des moments." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0068/document.
The overall objective of this thesis is to apply a polynomial optimization method, based on moments theory, on some vision problems. These problems are often nonconvex and they are classically solved using local optimization methods. Without additional hypothesis, these techniques don’t converge to the global minimum and need to provide an initial estimate close to the exact solution. Global optimization methods overcome this drawback. Moreover, the polynomial optimization based on moments theory could take into account particular constraints. In this thesis, we extend this method to the problems of minimizing a sum of many rational functions. In addition, under particular assumptions of "sparsity", we show that it is possible to deal with a large number of variables while maintaining reasonable computation times. Finally, we apply these methods to particular computer vision problems: minimization of projective distortions due to image rectification process, Fundamental matrix estimation, and multi-view 3D reconstruction with and without radial distortions
Gimenez, Lucile. "Outils numériques pour la reconstruction et l'analyse sémantique de représentations graphiques de bâtiments." Thesis, Paris 8, 2015. http://www.theses.fr/2015PA080047.
Many buildings have to undergo major renovation to comply with regulations and environmental challenges. The BIM (Building Information Modeling) helps designers to make better-informed decisions, and results in more optimal energy-efficient designs. Such advanced design approaches require 3D digital models. However such models are not available for existing buildings. The aim of our work is to develop a method to generate 3D building models from existing buildings at low cost and in a reasonable time. We have chosen to work with 2D scanned plans. We assume that it is possible to find a paper plan for most buildings even if it is not always up-to-date and if the recognition quality is also dependent to the plan. The automatic reconstruction of a BIM from a paper plan is based on the extraction and identification of 3 main components: geometry (element shape), topology (links between elements) and semantics (object properties). During this process, some errors are generated which cannot be automatically corrected. This is why, we propose a novel approach based on punctual and guided human interventions to automatically identify and propose correction choices to the user to avoid error propagation.We describe the developed methodology to convert semi-automatically a 2D scanned plan into a BIM. A result analysis is done on 90 images. The following works is focused on the process genericity to test its robustness, the challenge of moving to scale and the multi-level management. The results highlight the pertinence of the error classification, identification and choices made to the user. The process is flexible in order to be completed by others data sources