Relevant bibliographies by topics / Graph transformer / Dissertations / Theses
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Dissertations / Theses on the topic 'Graph transformer'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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1

Sandström, Emil. "Molecular Optimization Using Graph-to-Graph Translation." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172584.

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Drug development is a protracted and expensive process. One of the main challenges indrug discovery is to find molecules with desirable properties. Molecular optimization is thetask of optimizing precursor molecules by affording them with desirable properties. Recentadvancement in Artificial Intelligence, has led to deep learning models designed for molecularoptimization. These models, that generates new molecules with desirable properties, have thepotential to accelerate the drug discovery. In this thesis, I evaluate the current state-of-the-art graph-to-graph translation model formolecular o
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Holmström, Oskar. "Exploring Transformer-Based Contextual Knowledge Graph Embeddings : How the Design of the Attention Mask and the Input Structure Affect Learning in Transformer Models." Thesis, Linköpings universitet, Artificiell intelligens och integrerade datorsystem, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-175400.

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The availability and use of knowledge graphs have become commonplace as a compact storage of information and for lookup of facts. However, the discrete representation makes the knowledge graph unavailable for tasks that need a continuous representation, such as predicting relationships between entities, where the most probable relationship needs to be found. The need for a continuous representation has spurred the development of knowledge graph embeddings. The idea is to position the entities of the graph relative to each other in a continuous low-dimensional vector space, so that their relati
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Dronzeková, Michaela. "Analýza polygonálních modelů pomocí neuronových sítí." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-417253.

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This thesis deals with rotation estimation of 3D model of human jaw. It describes and compares methods for direct analysis od 3D models as well as method to analyze model using rasterization. To evaluate perfomance of proposed method, a metric that computes number of cases when prediction was less than 30° from ground truth is used. Proposed method that uses rasterization, takes  three x-ray views of model as an input and processes it with convolutional network. It achieves best preformance, 99% with described metric. Method to directly analyze polygonal model as a sequence uses attention mech
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Balzani, Lorenzo. "Verbalizzazione di eventi biomedici espressi nella letteratura scientifica: generazione controllata di linguaggio naturale da grafi di conoscenza mediante transformer text-to-text." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24286/.

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Il periodo in cui viviamo rappresenta la cuspide di una forte e rapida evoluzione nella comprensione del linguaggio naturale, raggiuntasi prevalentemente grazie allo sviluppo di modelli neurali. Nell'ambito dell'information extraction, tali progressi hanno recentemente consentito di riconoscere efficacemente relazioni semantiche complesse tra entità menzionate nel testo, quali proteine, sintomi e farmaci. Tale task -- reso possibile dalla modellazione ad eventi -- è fondamentale in biomedicina, dove la crescita esponenziale del numero di pubblicazioni scientifiche accresce ulteriormente il bis
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Rizkallah, Mira. "Graph based transforms for compression of new imaging modalities." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S021/document.

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En raison de la grande disponibilité de nouveaux types de caméras capturant des informations géométriques supplémentaires, ainsi que de l'émergence de nouvelles modalités d'image telles que les champs de lumière et les images omnidirectionnelles, il est nécessaire de stocker et de diffuser une quantité énorme de hautes dimensions. Les exigences croissantes en matière de streaming et de stockage de ces nouvelles modalités d’image nécessitent de nouveaux outils de codage d’images exploitant la structure complexe de ces données. Cette thèse a pour but d'explorer de nouvelles approches basées sur
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Goodall, A. J. "Graph polynomials and the discrete Fourier transform." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401064.

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7

Zanella, Calzada Laura A. "Biomedical Event Extraction Based on Transformers and Knowledge Graphs." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0235.

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L'extraction d'événements biomédicaux peut être divisée en trois sous-tâches principales : (1) la détection de déclencheurs d'événements biomédicaux, (2) l'identification d'arguments biomédicaux et (3) la construction d'événements. Dans cette étude, pour la première sous-tâche, nous analysons un ensemble de modèles de langage transformer couramment utilisés dans le domaine biomédical afin d'évaluer et de comparer leur capacité à détecter les déclencheurs d'événements. Nous affinons les modèles en utilisant sept corpus annotés manuellement pour évaluer leurs performances dans différents sous-do
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8

Zhou, Bingxin. "Geometric Signal Processing with Graph Neural Networks." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28617.

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One of the most predominant techniques that have achieved phenomenal success in many modern applications is deep learning. The obsession with massive data analysis in image recognition, speech processing, and text understanding spawns remarkable advances in deep learning of diverse research areas. The alliance of deep learning technologies yields mighty graph neural networks (GNNs), an emerging type of deep neural networks that encodes internal structural relationships of inputs. The mainstream of GNNs finds an adequate numerical representation of graphs, which is vital to the prediction perfo
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9

Malek, Mohamed. "Extension de l'analyse multi-résolution aux images couleurs par transformées sur graphes." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2304/document.

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Dans ce manuscrit, nous avons étudié l’extension de l’analyse multi-résolution aux images couleurs par des transformées sur graphe. Dans ce cadre, nous avons déployé trois stratégies d’analyse différentes. En premier lieu, nous avons défini une transformée basée sur l’utilisation d’un graphe perceptuel dans l’analyse à travers la transformé en ondelettes spectrale sur graphe. L’application en débruitage d’image met en évidence l’utilisation du SVH dans l’analyse des images couleurs. La deuxième stratégie consiste à proposer une nouvelle méthode d’inpainting pour des images couleurs. Pour cela,
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FRACASTORO, GIULIA. "Design and Optimization of Graph Transform for Image and Video Compression." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2671060.

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The main contribution of this thesis is the introduction of new methods for designing adaptive transforms for image and video compression. Exploiting graph signal processing techniques, we develop new graph construction methods targeted for image and video compression applications. In this way, we obtain a graph that is, at the same time, a good representation of the image and easy to transmit to the decoder. To do so, we investigate different research directions. First, we propose a new method for graph construction that employs innovative edge metrics, quantization and edge prediction techni
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11

CELOTTO, DARIO. "Riesz transforms, spectral multipliers and Hardy spaces on graphs." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/118889.

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In this thesis we consider a connected locally finite graph G that possesses the Cheeger isoperimetric property. We define a decreasing one parameter family of Hardy-type spaces associated with the standard nearest neighbour Laplacian on G. We show that the space with parameter ½ is the space of all integrable functions whose Riesz transform is integrable. We show that if G has bounded geometry and the parameter is an integer, the corresponding Hardy-type space admits an atomic decomposition. We also show that if G is a homogeneous tree and the parameter is not an integer, the corresponding Ha
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Malmberg, Filip. "Graph-based Methods for Interactive Image Segmentation." Doctoral thesis, Uppsala universitet, Centrum för bildanalys, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149261.

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The subject of digital image analysis deals with extracting relevant information from image data, stored in digital form in a computer. A fundamental problem in image analysis is image segmentation, i.e., the identification and separation of relevant objects and structures in an image. Accurate segmentation of objects of interest is often required before further processing and analysis can be performed. Despite years of active research, fully automatic segmentation of arbitrary images remains an unsolved problem. Interactive, or semi-automatic, segmentation methods use human expert knowledge a
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Viana, do Espírito Santo Ilísio. "Inspection automatisée d’assemblages mécaniques aéronautiques par vision artificielle : une approche exploitant le modèle CAO." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0022/document.

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Les travaux présentés dans ce manuscrit s’inscrivent dans le contexte de l’inspection automatisée d’assemblages mécaniques aéronautiques par vision artificielle. Il s’agit de décider si l’assemblage mécanique a été correctement réalisé (assemblage conforme). Les travaux ont été menés dans le cadre de deux projets industriels. Le projet CAAMVis d’une part, dans lequel le capteur d’inspection est constitué d’une double tête stéréoscopique portée par un robot, le projet Lynx© d’autre part, dans lequel le capteur d’inspection est une caméra Pan/Tilt/Zoom (vision monoculaire). Ces deux projets ont
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14

Behjat, Hamid. "Statistical Parametric Mapping of fMRI data using Spectral Graph Wavelets." Thesis, Linköpings universitet, Medicinsk informatik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81143.

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In typical statistical parametric mapping (SPM) of fMRI data, the functional data are pre-smoothed using a Gaussian kernel to reduce noise at the cost of losing spatial specificity. Wavelet approaches have been incorporated in such analysis by enabling an efficient representation of the underlying brain activity through spatial transformation of the original, un-smoothed data; a successful framework is the wavelet-based statistical parametric mapping (WSPM) which enables integrated wavelet processing and spatial statistical testing. However, in using the conventional wavelets, the functional d
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Lund, Darren Scott. "Fourier Decompositions of Graphs with Symmetries and Equitable Partitions." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/8925.

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We show that equitable partitions, which are generalizations of graph symmetries, and Fourier transforms are fundamentally related. For a partition of a graph's vertices we define a Fourier similarity transform of the graph's adjacency matrix built from the matrices used to carryout discrete Fourier transformations. We show that the matrix (graph) decomposes into a number of smaller matrices (graphs) under this transformation if and only if the partition is an equitable partition. To extend this result to directed graphs we define two new types of equitable partitions, equitable receiving and
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16

Valdivia, Paola Tatiana Llerena. "Graph signal processing for visual analysis and data exploration." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-15102018-165426/.

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Signal processing is used in a wide variety of applications, ranging from digital image processing to biomedicine. Recently, some tools from signal processing have been extended to the context of graphs, allowing its use on irregular domains. Among others, the Fourier Transform and the Wavelet Transform have been adapted to such context. Graph signal processing (GSP) is a new field with many potential applications on data exploration. In this dissertation we show how tools from graph signal processing can be used for visual analysis. Specifically, we proposed a data filtering method, based on
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Sweeney, Christian Francis. "RAPID AUTHENTICATION AND CONTENT DETERMINATION OF CONCORD GRAPE JUICE VIA FOURIER-TRANSFORM INFRARED SPECTROSCOPY AND CHEMOMETRIC ANALYSIS." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1245176529.

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18

Bacon, Philippe. "Graphes d'ondelettes pour la recherche d'ondes gravitationnelles : application aux binaires excentriques de trous noirs." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC113/document.

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En décembre 2015, les détecteurs LIGO ont pour la première fois détecté une onde gravitationnelle émise lors de la coalescence d'une paire de trous noirs il y a de cela 1.3 milliards d'années. Une telle première dans la toute nouvelle astronomie gravitationnelle a été suivie par plusieurs autres observations. La dernière en date est la fusion de deux étoiles à neutron dont la contrepartie électromagnétique a pu être observée par plusieurs observatoires à travers le monde. A cette occasion, les ondes gravitationnelles se sont inscrites dans l'astronomie multi-messager. Ces observations ont été
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19

Kirioukhine, Guennadi. "Implementation of two-dimensional discrete cosine transform in xilinx field programmable gate array using flow-graph and distributed arithmetic techniques." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174679848.

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20

Kwiecinski, Michal. "Sur le transformé de Nash et la construction du graphe de Macpherson avec applications aux classes caractéristiques." Aix-Marseille 1, 1994. http://www.theses.fr/1994AIX11025.

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Cette these est composee de deux parties, chacune traitant des deformations et modifications de varietes, relatives a des singularites. Dans la premiere partie, nous demontrons plusieurs resultats sur la construction du graphe grassmannien de macpherson: son equivalence avec un eclatement d'un ideal construit a partir des ideaux de fitting, un resultat d'analyticite, d'independance des choix et une comparaison avec le transforme de nash. Ce dernier resultat nous permet de comparer dans certaines dimensions des classes caracteristiques d'un faisceau definies a l'aide des resolutions avec des cl
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Paolantoni, Thibault. "Application de Riemann-Hilbert-Birkhoff." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS410/document.

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L'application exponentielle duale est une façon d'encoder les matrices de Stokes d'une connexion sur un fibré trivial sur la sphère de Riemann avec deux pôles : un pôle double en 0 et un pôle simple en l'infini.On donne ici une formule pour l'application exponentielle duale comme une série formelle non commutative. D'autres généralisations de cette formule sont données<br>The exponential dual map is a way to encode Stokes data of a connection on a trivial vector bundle on the Riemann sphere with two poles: one double pole at 0 and one simple pole at infinity.We give here a formula for the expo
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Saeed, Mohammed. "Employing Transformers and Humans for Textual-Claim Verification." Electronic Thesis or Diss., Sorbonne université, 2022. https://theses.hal.science/tel-03922010.

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Au cours des dernières années, il y a eu une augmentation des fausses nouvelles. Malgré les efforts déployés pour atténuer les "fake news", il reste de nombreuses épreuves à surmonter lorsqu'on essaie de construire des systèmes de vérification automatique des faits, dont les quatre que nous abordons dans cette thèse. Tout d'abord, il n'est pas clair comment combler le fossé entre les affirmations textuelles en entrée, qui doivent être vérifiées, et les données structurées qui doivent être utilisées pour la vérification des affirmations. Nous faisons un pas dans cette direction en introduisant
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Andersson, Filip, and Jonatan Flyckt. "Explaining rifle shooting factors through multi-sensor body tracking : Using transformers and attention to mine actionable patterns from skeleton graphs." Thesis, Jönköping University, JTH, Avdelningen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-53369.

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There is a lack of data-driven training instructions for sports shooters, as instruction has commonly been based on subjective assessments. Many studies have correlated body posture and balance to shooting performance in rifle shooting tasks, but most of them have focused on single aspects of postural control. This thesis has focused on finding relevant rifle shooting factors by examining the entire body over sequences of time. We performed a data collection with 13 human participants who carried out live rifle shooting scenarios while being recorded with multiple biometric sensors, including
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Tavares, Anderson Carlos Moreira. "Interactive 3D segmentation repair with image-foresting transform, supervoxels and seed robustness." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-03082017-230907/.

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Image segmentation consists on its partition into relevant regions, such as to isolate the pixels belonging to desired objects in the image domain, which is an important step for computer vision, medical image processing, and other applications. Many times automatic segmentation generates results with imperfections. The user can correct them by editing manually, interactively or can simply discard the segmentation and try to automatically generate another result by a different method. Interactive methods combine benefits from manual and automatic ones, reducing user effort and using its high-l
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Ram, Sundaresh, and Sundaresh Ram. "Sparse Representations and Nonlinear Image Processing for Inverse Imaging Solutions." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626164.

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This work applies sparse representations and nonlinear image processing to two inverse imaging problems. The first problem involves image restoration, where the aim is to reconstruct an unknown high-quality image from a low-quality observed image. Sparse representations of images have drawn a considerable amount of interest in recent years. The assumption that natural signals, such as images, admit a sparse decomposition over a redundant dictionary leads to efficient algorithms for handling such sources of data. The standard sparse representation, however, does not consider the intrinsic geome
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Boschi, Marco. "SAFFIRE: System for Autonomous Feature Filtering for Intelligent ROI Estimation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/19802/.

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Questo lavoro si colloca nell'ambito della machine vision e propone un metodo innovativo per effettuare ispezioni di oggetti lungo le linee di produzione. Con l'obiettivo di identificare una ROI nelle immagini acquisite per procedere all'ispezione dei pezzi, il framework proposto include una metodologia per scegliere in maniera automatica e oggettiva il miglior anchor pattern per il posizionamento della ROI attraverso una fase di training incrementale, rapida e interattiva. La ricerca della ROI utilizza l'anchor pattern trovato per individuare possibili candidati e scegliere secondo opportune
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27

Noiry, Nathan. "Matrices aléatoires et graphes aléatoires." Thesis, Paris 10, 2020. http://www.theses.fr/2020PA100059.

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Cette thèse se compose de plusieurs travaux ayant trait à la théorie des matrices aléatoires et à la théorie des graphes aléatoires. Dans le contexte des matrices aléatoires, un premier travail porte sur l'étude spectrale des matrices de Wishart dont la taille tend vers l'infini et dont les moments des coefficients explosent. Dans ce cadre, nous calculons un développement asymptotique de la limite des mesures spectrales empiriques au voisinage de la loi de Marchenko-Pastur. Dans un second travail, nous nous sommes intéressés aux modèles matriciels déformés. Nous démontrons que l'étude des mesu
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Bejar, Hans Harley Ccacyahuillca. "Conexidade fuzzy relativa em grafos dirigidos e sua aplicação em um método híbrido para segmentação interativa de imagens." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-28042016-211904/.

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A segmentação de imagens consiste em dividir uma imagem em regiões ou objetos que a compõem, como, por exemplo, para isolar os pixels de um objeto alvo de uma dada aplicação. Em segmentação de imagens médicas, o objeto de interesse comumente apresenta transições em suas bordas predominantemente do tipo claro para escuro ou escuro para claro. Métodos tradicionais por região, como a conexidade fuzzy relativa (RFC - Relative Fuzzy Connectedness), não distinguem bem entre essas bordas similares com orientações opostas. A especificação da polaridade de contorno pode ajudar a amenizar esse problema,
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Chen, Li. "Quasi transformées de Riesz, espaces de Hardy et estimations sous-gaussiennes du noyau de la chaleur." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01001868.

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Dans cette thèse nous étudions les transformées de Riesz et les espaces de Hardy associés à un opérateur sur un espace métrique mesuré. Ces deux sujets sont en lien avec des estimations du noyau de la chaleur associé à cet opérateur. Dans les Chapitres 1, 2 et 4, on étudie les transformées quasi de Riesz sur les variétés riemannienne et sur les graphes. Dans le Chapitre 1, on prouve que les quasi transformées de Riesz sont bornées dans Lp pour 1
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Coelho, Keivilany Janielle de Lima. "Dos requisitos ? arquitetura em linhas de produtos de software: uma estrat?gia de transforma??es entre modelos." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18040.

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Made available in DSpace on 2014-12-17T15:47:59Z (GMT). No. of bitstreams: 1 KeivilanyJLC_DISSERT.pdf: 3136956 bytes, checksum: 58f2931b21ff1ab0cd5e4e065e0d1aa4 (MD5) Previous issue date: 2012-02-06<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The tracking between models of the requirements and architecture activities is a strategy that aims to prevent loss of information, reducing the gap between these two initial activities of the software life cycle. In the context of Software Product Lines (SPL), it is important to have this support, which allows the correspondence
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Grobler, Trienko Lups. "Fountain codes and their typical application in wireless standards like edge." Diss., University of Pretoria, 2008. http://hdl.handle.net/2263/25381.

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One of the most important technologies used in modern communication systems is channel coding. Channel coding dates back to a paper published by Shannon in 1948 [1] entitled “A Mathematical Theory of Communication”. The basic idea behind channel coding is to send redundant information (parity) together with a message to make the transmission more error resistant. There are different types of codes that can be used to generate the parity required, including block, convolutional and concatenated codes. A special subclass of codes consisting of the codes mentioned in the previous paragraph, is sp
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Feneuil, Joseph. "Analyse harmonique sur les graphes et les groupes de Lie : fonctionnelles quadratiques, transformées de Riesz et espaces de Besov." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAM040/document.

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Ce mémoire est consacré à des résultats d'analyse harmonique réelle dans des cadres géométriques discrets (graphes) ou continus (groupes de Lie).Soit $\Gamma$ un graphe (ensemble de sommets et d'arêtes) muni d'un laplacien discret $\Delta=I-P$, où $P$ est un opérateur de Markov.Sous des hypothèses géométriques convenables sur $\Gamma$, nous montrons la continuité $L^p$ de fonctionnelles de Littlewood-Paley fractionnaires. Nous introduisons des espaces de Hardy $H^1$ de fonctions et de $1$-formes différentielles sur $\Gamma$, dont nous donnons plusieurs caractérisations, en supposant seulement
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Humari, Juan Herbert Chuctaya. "Estudo do espectro Laplaciano na categorização de imagens." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-04072016-091446/.

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Uma imagem engloba informação que precisa ser organizada para interpretar e compreender seu conteúdo. Existem diversas técnicas computacionais para extrair a principal informação de uma imagem e podem ser divididas em três áreas: análise de cor, textura e forma. Uma das principais delas é a análise de forma, por descrever características de objetos baseadas em seus pontos fronteira. Propomos um método de caracterização de imagens, por meio da análise de forma, baseada nas propriedades espectrais do laplaciano em grafos. O procedimento construiu grafos G baseados nos pontos fronteira do objeto,
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Leandro, Jorge de Jesus Gomes. "Análise de formas usando wavelets em grafos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-02072014-150049/.

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O presente texto descreve a tese de doutorado intitulada Análise de Formas usando Wavelets em Grafos. O tema está relacionado à área de Visão Computacional, particularmente aos tópicos de Caracterização, Descrição e Classificação de Formas. Dentre os métodos da extensa literatura em Análise de Formas 2D, percebe-se uma presença menor daqueles baseados em grafos com topologia arbitrária e irregular. As contribuições desta tese procuram preencher esta lacuna. É proposta uma metodologia baseada no seguinte pipeline : (i) Amostragem da forma, (ii) Estruturação das amostras em grafos, (iii) Função-
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Colledan, Andrea. "On the Hidden Subgroup Problem as a Pivot in Quantum Complexity Theory." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16112/.

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Quantum computing has opened the way to new algorithms that can efficiently solve problems that have always been deemed intractable. However, since quantum algorithms are hard to design, the necessity to find a generalization of these problems arises. Such necessity is satisfied by the hidden subgroup problem (HSP), an abstract problem of group theory which successfully generalizes a large number of intractable problems. The HSP plays a significant role in quantum complexity theory, as efficient algorithms that solve it can be employed to efficiently solve other valuable problems, such as inte
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Audigier, Romaric Matthias Michel. "Zona de empate : o elo entre transformadas de watershed e conexidade nebulosa." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261112.

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Orientador: Roberto de Alencar Lotufo<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-13T08:32:02Z (GMT). No. of bitstreams: 1 Audigier_RomaricMatthiasMichel_D.pdf: 1753584 bytes, checksum: 1d31eb6f095099ffb5c3ec8d0a96a9cf (MD5) Previous issue date: 2007<br>Resumo: Esta tese introduz o novo conceito de transformada de zona de empate que unifica as múltiplas soluções de uma transformada de watershed, conservando apenas as partes comuns em todas estas, tal que as partes que diferem constituem a zon
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Braz, Caio de Moraes. "Segmentação de imagens pela transformada imagem-floresta com faixa de restrição geodésica." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-01062016-104354/.

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Vários métodos tradicionais de segmentação de imagens, como a transformada de watershed de marcado- res e métodos de conexidade fuzzy (Relative Fuzzy Connectedness- RFC, Iterative Relative Fuzzy Connected- ness - IRFC), podem ser implementados de modo eficiente utilizando o método em grafos da Transformada Imagem-Floresta (Image Foresting Transform - IFT). No entanto, a carência de termos de regularização de fronteira em sua formulação fazem com que a borda do objeto segmentado possa ser altamente irregular. Um modo de contornar isto é por meio do uso de restrições de forma do objeto, que favo
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Mansilla, Lucy Alsina Choque. "Segmentação de objetos via transformada imagem-floresta orientada com restrições de conexidade." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-01102018-120427/.

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Segmentação de objetos em imagens é um dos problemas mais fundamentais e desafiadores em processamento de imagem e visão computacional. O conhecimento de alto nível e específico do usuário é frequentemente requerido no processo de segmentação, devido à presença de fundos heterogêneos, objetos com bordas fracamente definidas, inomogeneidade de campo, ruído, artefatos, efeitos de volume parcial e seus efeitos conjuntos. Propriedades globais do objeto de interesse, tais como conexidade, restrições de forma e polaridade de borda, são conhecimentos prévios de alto nível úteis para a sua segmentação
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Calatroni, Luca. "New PDE models for imaging problems and applications." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/256139.

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Variational methods and Partial Differential Equations (PDEs) have been extensively employed for the mathematical formulation of a myriad of problems describing physical phenomena such as heat propagation, thermodynamic transformations and many more. In imaging, PDEs following variational principles are often considered. In their general form these models combine a regularisation and a data fitting term, balancing one against the other appropriately. Total variation (TV) regularisation is often used due to its edgepreserving and smoothing properties. In this thesis, we focus on the design of T
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Shaheen, Mudar. "Reconnaissance d'Objets Polyédriques à partir d'une image vidéo pour la téléopération." Phd thesis, Université d'Evry-Val d'Essonne, 1999. http://tel.archives-ouvertes.fr/tel-00682206.

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Notre laboratoire travaille sur la conception et le développement de Modules de Contrôle et d'Interface pour la Téléopération (MCIT). Le but de MCIT est de fournir à l'opérateur une aide pour la perception et pour la commande du site téléopéré. L'aide visuelle consiste en la mise à jour et la superposition de la BD3D sur l'image vidéo. Afin d'automatiser cette aide, un système de reconnaissance de polyèdres à partir d'une image de luminance a été développé et intégré à MCIT dans le cadre de cette thèse. Ce système est constitué d'un module de traitement d'images et d'un module d'appariement 2D
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Berka, Petr. "Snímání scény pomocí USB a FireWire kamer." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217203.

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This diploma thesis deals with a interface USB and FireWire cameras to a computer through a technology called DirectShow. I used mostly a development kit „MontiVision“, which cooperates with a programming environment as is e.g. Microsoft Visual C++. You find here how to use a direct pixel access, how to get singles photos from a video, how to set up and calibrate a camera and how can look a particular application of the image processing. I wrote an introduction to the stereo-vision above the frame of my task. This thesis is like a manual for students. It includes my personal experiences and ex
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Pedrosa, Diogo Pinheiro Fernandes. "Mapeamento de ambientes estruturados com extra??o de informa??es geom?tricas atrav?s de dados sensoriais." Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15114.

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Made available in DSpace on 2014-12-17T14:54:48Z (GMT). No. of bitstreams: 1 DiogoPFP_Tese.pdf: 4402228 bytes, checksum: 17eacb6b5f1731f405518c976d32f701 (MD5) Previous issue date: 2006-05-19<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>&#65279;The objective of this thesis is proposes a method for a mobile robot to build a hybrid map of an indoor, semi-structured environment. The topological part of this map deals with spatial relationships among rooms and corridors. It is a topology-based map, where the edges of the graph are rooms or corridors, and each link between t
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Mansilla, Lucy Alsina Choque. "Transformada imagem-floresta com funções de conexidade não suaves: pesos adaptativos, polaridade de borda e restrições de forma." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-17032014-121734/.

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Segmentar uma imagem consiste em particioná-la em regiões relevantes para uma dada aplicação, como para isolar um objeto de interesse no domínio de uma imagem. A segmentação é um dos problemas mais fundamentais e desafiadores em processamento de imagem e visão computacional. Ela tem desempenhado um papel importante, por exemplo, na pesquisa em neurologia, envolvendo imagens de Ressonância Magnética (RM), para fins de diagnóstico e tratamento de doenças relacionadas com alterações na anatomia do cérebro humano. Métodos de segmentação baseados na transformada imagem- floresta (IFT, Image Fore
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Grangeteau, Cédric. "Biodiversité fongique du raisin au vin : impact de l'activité anthropique." Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS040/document.

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Les effets de différentes activités anthropiques (vignoble, cuverie) sur les populations fongiques du raisin au vin ont été étudiés. Afin de caractériser ces effets, il était nécessaire d’avoir accès à la diversité globale des populations (pyroséquençage et IR-TF) mais également à la diversité intraspécifique (IR-TF). La spectroscopie a ainsi été validée pour sa capacité à caractériser la population globale et à discriminer les souches pour trois espèces de levures non-Saccharomyces (NS). Pour la première fois, il est démontré que la baie de raisin constitue une source limitée pour les levures
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Umarikar, Amod Chandrashekhar. "Modelling Of Switched Mode Power Converters : A Bond Graph Approach." Thesis, 2006. https://etd.iisc.ac.in/handle/2005/406.

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Modelling and simulation are essential ingredients of the analysis and design process in power electronics. It helps a design engineer gain an increased understanding of circuit operation. Accordingly, for a set of specifications given, the designer will choose a particular topology, select component types and values, estimate circuit performance etc. Typically hierarchical modelling, analysis and simulation rather than full detailed simulation of the system provides a crucial insight and understanding. The combination of these insights with hardware prototyping and experiments constitutes a
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Umarikar, Amod Chandrashekhar. "Modelling Of Switched Mode Power Converters : A Bond Graph Approach." Thesis, 2006. http://hdl.handle.net/2005/406.

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Modelling and simulation are essential ingredients of the analysis and design process in power electronics. It helps a design engineer gain an increased understanding of circuit operation. Accordingly, for a set of specifications given, the designer will choose a particular topology, select component types and values, estimate circuit performance etc. Typically hierarchical modelling, analysis and simulation rather than full detailed simulation of the system provides a crucial insight and understanding. The combination of these insights with hardware prototyping and experiments constitutes a p
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Shih, Pi-Hau, and 時丕澔. "Approximation and acceleration of Graph Fourier Transform on Special graph structure." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jf3652.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>106<br>Graph signal processing is a research area dealing with signals on graph, and Graph Fourier transform is a cornerstone of it. Different with discrete Fourier transform, who has fast Fourier transform as its fast implementation method, a full matrix-vector multi-plication is needed for a graph Fourier transform, which contains O(n^2) operations. Nevertheless, when a graph has some special structure, their graph Fourier trans-form will have some properties similar to the fast Fourier transform. Thus can be accel-erated by factorization with sparse matrices.
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Wu, Chun-Chang, and 吳俊樟. "Method of the wavelet transforms compares in the graph." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/62552561471533586721.

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碩士<br>國立中央大學<br>數學研究所<br>95<br>In recent years along with the advance in technology, using the functions and quality of imaging devices is getting more and more common, how processes the image is quite important. But in examination work, if with human eye judgment graph slight defect, regular session, because artificial subjectively or creates the mistake wearily, therefore in the examination graph slight defect, needs the computer precess image compared and defect inspection. In this thesis , we concentrate in provide a graph compares to the method, use wavelet transform, may have ability to
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Jhang, Shenghao, and 張勝豪. "Improving Graph Cuts Algorithm To Transform Sequence Of Stereo Image To Depth Map." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54486136390013868511.

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碩士<br>國立宜蘭大學<br>資訊工程研究所碩士班<br>99<br>Recently, 3D display systems are getting considerable attentions not only from theater but also from home. 3D multimedia content is revolutionizing visual entertainment which people can feel more real and fun than color and sound of 2D. Lenticular Autostereoscopic display is one of the 3D-TV that consists of following advantages. It improves 3D viewing experience, supports wider viewing angles and multiple viewers, and no needs for special glasses. But the current 3D movie and camera don’t support the Autostereoscopic. Therefore, we proposed a system that ca
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VERDOJA, FRANCESCO. "The use of Graph Fourier Transform in image processing: A new solution to classical problems." Doctoral thesis, 2017. http://hdl.handle.net/2318/1645345.

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Graph-based approaches have recently seen a spike of interest in the image processing and computer vision communities, and many classical problems are finding new solutions thanks to these techniques. The Graph Fourier Transform (GFT), the equivalent of the Fourier transform for graph signals, is used in many domains to analyze and process data modeled by a graph. In this thesis we present some classical image processing problems that can be solved through the use of GFT. We'll focus our attention on two main research area: the first is image compression, where the use of the GFT is finding i
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