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Dissertations / Theses on the topic 'Visual image reconstruction'

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1

Duraisamy, Prakash. "3D Reconstruction Using Lidar and Visual Images." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177193/.

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In this research, multi-perspective image registration using LiDAR and visual images was considered. 2D-3D image registration is a difficult task because it requires the extraction of different semantic features from each modality. This problem is solved in three parts. The first step involves detection and extraction of common features from each of the data sets. The second step consists of associating the common features between two different modalities. Traditional methods use lines or orthogonal corners as common features. The third step consists of building the projection matrix. Many exi
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2

He, Peng. "Image-based reconstruction and visual hull from imprecise input." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10005.

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Image-based reconstruction is a series of computer vision processes which takes 2D images of the scene as input and outputs the geometric shape approximate of the scene. It has vast applications in industrial design, manufacture, gaming, filming, heritage protection and many other areas. The visual hull of a polyhedral (or polygonal) scene in R3 (or R2) is the best 3D (or 2D) shape that one can retrieve from its silhouettes. It has great advantage in obstacle avoidance, robotic navigation, 3D model acquisition and human motion tracking. A 3D visual hull is bounded by planes and quadratic surfa
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3

Grauman, Kristen Lorraine 1979. "A statistical image-based shape model for visual hull reconstruction and 3D structure inference." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87347.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.<br>Includes bibliographical references (p. 69-72).<br>by Kristen Lorraine Grauman.<br>S.M.
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4

Ozcelik, Furkan. "Déchiffrer le langage visuel du cerveau : reconstruction d'images naturelles à l'aide de modèles génératifs profonds à partir de signaux IRMf." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES073.

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Les grands esprits de l'humanité ont toujours été curieux de la nature de l'esprit, du cerveau et de la conscience. Par le biais d'expériences physiques et mentales, ils ont tenté de répondre à des questions difficiles sur la perception visuelle. Avec le développement des techniques de neuro-imagerie, les techniques de codage et de décodage neuronaux ont permis de mieux comprendre la manière dont nous traitons les informations visuelles. Les progrès réalisés dans les domaines de l'intelligence artificielle et de l'apprentissage profond ont également influencé la recherche en neuroscience. Avec
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5

Anliot, Manne. "Volume Estimation of Airbags: A Visual Hull Approach." Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-421.

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<p>This thesis presents a complete and fully automatic method for estimating the volume of an airbag, through all stages of its inflation, with multiple synchronized high-speed cameras.</p><p>Using recorded contours of the inflating airbag, its visual hull is reconstructed with a novel method: The intersections of all back-projected contours are first identified with an accelerated epipolar algorithm. These intersections, together with additional points sampled from concave surface regions of the visual hull, are then Delaunay triangulated to a connected set of tetrahedra. Finally, the visual
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6

Naouai, Mohamed. "Localisation et reconstruction du réseau routier par vectorisation d'image THR et approximation des contraintes de type "NURBS"." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00994333.

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Ce travail de thèse vise à mettre en place un système d'extraction de réseau routier en milieu urbain à partir d'image satellite à très haute résolution. Dans ce contexte, nous avons proposé deux méthodes de localisation de routes. La première approche est fondée sur la procédure de conversion de l'image vers un format vectoriel. L'originalité de cette approche réside dans l'utilisation d'une méthode géométrique pour assurer le passage vers une représentation vectorielle de l'image d'origine et la mise en place d'un formalisme logique fondé sur un ensemble de critères perceptifs permettant le
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Bussy, Victor. "Integration of a priori data to optimise industrial X-ray tomographic reconstruction." Electronic Thesis or Diss., Lyon, INSA, 2024. http://www.theses.fr/2024ISAL0116.

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Cette thèse explore des sujets de recherche dans le domaine du contrôle non destructif industriel par rayons X (CND). L’application de la tomographie CT s’est considérablement étendue et son utilisation s'est intensifiée dans de nombreux secteurs industriels. En raison des exigences croissantes et des contraintes sur les processus de contrôle, la CT se doit de constamment évoluer et s'adapter. Que ce soit en termes de qualité de reconstruction ou en temps d’inspection, la tomographie par rayons X est en constante progression, notamment dans ce qu’on appelle la stratégie de vues éparses. Cette
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Féraud, Thomas. "Rejeu de chemin et localisation monoculaire : application du Visual SLAM sur carte peu dense en environnement extérieur contraint." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00697028.

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Dans le cadre de la robotique mobile en environnement extérieur, les concepts de localisation et de perception sont au coeur de toute réalisation. Aussi, les travaux menés au sein de cette thèse visent à rendre plus robustes des processus de localisation existants sans pour autant augmenter de manière notable leur complexité. La problématique proposée place un robot au sein d'un environnement potentiellement dangereux avec pour objectif de suivre une trajectoire établie comme sécurisée avec une carte aussi simple que possible. De plus, des contraintes fortes sont imposées tant dans la réalisat
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9

North, Peter R. J. "The reconstruction of visual appearance by combining stereo surfaces." Thesis, University of Sussex, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362837.

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10

Ebrahimi, Shahin. "Contribution to automatic adjustments of vertebrae landmarks on x-ray images for 3D reconstruction and quantification of clinical indices." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0050/document.

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L’exploitation de données radiographiques, en particulier pour la reconstruction 3D du rachis de patients scoliotiques, est un prérequis à la modélisation personnalisée. Les méthodes actuelles, bien qu’assez robustes pour la routine clinique, reposent sur des ajustements manuels fastidieux. Dans ce contexte, ce travail de thèse vise à la détection automatisée de points anatomiques spécifiques des vertèbres, permettant ainsi des ajustements automatisés. Nous avons développé premièrement une méthode originale de localisation de coins de vertèbres cervicales et lombaires sur les radiographies sag
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11

Haouchine, Nazim. "Image-guided simulation for augmented reality during hepatic surgery." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10009/document.

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L’objectif principal de cette thèse est de fournir aux chirurgiens des outils d’aide à la décision pré et per-opératoire lors d’interventions minimalement invasives en chirurgie hépatique. Ces interventions reposent en général sur des techniques de laparoscopie ou plus récemment d’endoscopie flexible. Lors de telles interventions, le chirurgien cherche à retirer un nombre souvent important de tumeurs hépatiques, tout en préservant le rôle fonctionnel du foie. Cela implique de définir une hépatectomie optimale, c’est à dire garantissant un volume du foie post-opératoire d’au moins 55% du foie i
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12

Koehler, Ana Luiza Goulart. "Retraçando os becos de Porto Alegre : visualizando a cidade invisível." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/139940.

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O presente estudo tem por objetivo geral recuperar as imagens de uma cidade no passado, mas de uma cidade que se pode chamar de "invisível": a cidade dos becos, espaços vistos como enclaves de exclusão social e marginalização no centro de Porto Alegre. Para isso, será utilizada a História Cultural como arcabouço teórico para o entrecruzamento e composição de indícios textuais e imagéticos colhidos na documentação, culminando com a reconstrução, através de representações gráficas, de vistas perspectivas destes espaços urbanos desaparecidos.<br>The present study aims to recover the images and th
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13

Kröber, Cindy, Kristina Friedrichs, and Nicole Filz. "HistStadt4D – A four dimensional access to history." TUDpress, 2016. https://tud.qucosa.de/id/qucosa%3A33991.

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Purpose – We propose a multidisciplinary approach based on an extensive data base which provides digitalized photographic material from the end of the 19th century up to recent times. Thus a large amount of photographic evidence will be exploited, structured and enriched by additional sources to serve as a foundation for an application relying on 3D visualizations. The application addresses scholars as well as the general public and will provide different kinds of information and tools for research and knowledge transfer. Design/methodology/approach – The method applied will be diachronic: the
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14

"Locally Adaptive Stereo Vision Based 3D Visual Reconstruction." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.44195.

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abstract: Using stereo vision for 3D reconstruction and depth estimation has become a popular and promising research area as it has a simple setup with passive cameras and relatively efficient processing procedure. The work in this dissertation focuses on locally adaptive stereo vision methods and applications to different imaging setups and image scenes. Solder ball height and substrate coplanarity inspection is essential to the detection of potential connectivity issues in semi-conductor units. Current ball height and substrate coplanarity inspection tools are expensive and slow, whic
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15

Grauman, Kristen. "A Statistical Image-Based Shape Model for Visual Hull Reconstruction and 3D Structure Inference." 2003. http://hdl.handle.net/1721.1/7104.

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We present a statistical image-based shape + structure model for Bayesian visual hull reconstruction and 3D structure inference. The 3D shape of a class of objects is represented by sets of contours from silhouette views simultaneously observed from multiple calibrated cameras. Bayesian reconstructions of new shapes are then estimated using a prior density constructed with a mixture model and probabilistic principal components analysis. We show how the use of a class-specific prior in a visual hull reconstruction can reduce the effect of segmentation errors from the silhouette extrac
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16

Khwaja, Asim. "Exploring the visual pathway and its applications to image reconstruction, contrast enhancement and object recognition." Phd thesis, 2010. http://hdl.handle.net/1885/150688.

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The natural world is filled with perfectly working, functional systems that are robust, accurate, and adaptable; this work takes favour with the aforesaid and presents a biologically inspired approach to computer vision; in particular on the subjects of image reconstruction, contrast enhancement and object recognition. The first half of this thesis takes an exploratory approach, on the example of image reconstruction, towards the understanding of the visual pathway from retina to the primary visual cortex (V1), investigating redundancy reduction, information preservation and contrast enhanceme
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17

Barnard, Gerrit. "High quality coding and reconstruction for transmission of single video images." Diss., 1990. http://hdl.handle.net/2263/29164.

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Please read the abstract in the section 00front of this document Copyright 1990, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Barnard, G 1990, High quality coding and reconstruction for transmission of single video images, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-10312007-110001/ ><br>Diss
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18

Chang, Yao-wen, and 張耀文. "Retinotopic Mapping Using Multi-Focal Functional MRI: Visual Image Reconstruction of Brain Activities and its Optimization method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/80867299933012723434.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>100<br>This thesis describes a study exploiting multi-focal functional MRI(fMRI) for retinotopic mapping, or retinotopy, in the primary visual cortex. We tried to reconstruct visual image according the retinotopy and brain activities obtained by fMRI. Multi-focal method divides the visual field into several blocks and each block has its own paradigm for the visual experiment. Using this method, researchers show that they are able to distinguish the brain areas corresponding to each block simultaneously. Despite visual fMRI, this method is also applied electrophysiolo
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19

(11166546), Xiaoyu Xiang. "Machine Learning and Deep Learning Approaches to Print defect Detection, Face Set Recognition, Face Alignment, and Visual Enhancement in Space and Time." Thesis, 2021.

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<div>The research includes machine Learning and Deep Learning Approaches to Print Defect Detection, Face Set Recognition and Face Alignment, and Visual-Enhancement in Space and Time. This thesis consists of six parts which are related to 6 projects:</div><div><br></div><div>In Chapter 1, the first project focuses on detection of local printing defects including gray spots and solid spots. We propose a coarse-to-fine method to detect local defects in a block-wise manner and aggregate the blockwise attributes to generate the feature vector of the whole test page for a further ranking task. In th
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20

Wu, Yi-Jong, and 吳宜蓉. "The Culture Reflection Under Imperial Ching Dynasty-- the Compiling Visual Field in Taiwan Gazetteers and the Reconstruction of the Image of Taiwanese People in the “Folk Custom Category”." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/76840189615048932567.

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碩士<br>淡江大學<br>歷史學系碩士在職專班<br>99<br>Taiwan was incorporated into the operation system of the Chinese Qing Empire in the Kangxi twenty third year (AD 1684). This giant empire was about to know the tiny island located in the southeast coast. A huge empire machine was ready to mesh its heavy wheels with the pinion of the small island, and activated the driven wheel by giving island the rhythms and tempos that empire’s memberships required. Question is, how to "chimera"? How to let the tiny island familiar with the rhythms of this giant and sophisticated operation system appropriately? Therefore, t
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21

Chang, Ter Hsin, and 張德歆. "Juan Net Wanderings – A Spiritual Exploration of the Reconstruction and Stacking of Visual Images in Different States of Consciousness." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/57250746638173029795.

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碩士<br>華梵大學<br>美術學系碩士班<br>101<br>This paper primarily focuses on paintings created by the author between 2010 and 2012, investigating Juan Net’s influence on the various manifestations of the environment’s and people’s expressions of imagination and meaning. The paper also explores the spirit behind the author’s methods and modes of painting and delves into the reconstruction and stacking under different states of consciousness that arise from visual reflection. When psychological and visual experiences are embodied in one’s creations, the creative spirit is released, and meaning and personalit
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