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Dissertations / Theses on the topic 'Shape descriptors'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Aktas, Mehmet Ali. "Shape descriptors." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/9663.

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Every day we recognize a numerous objects and human brain can recognize objects under many conditions. The way in which humans are able to identify an object is remarkably fast even in different size, colours or other factors. Computers or robots need computational tools to identify objects. Shape descriptors are one of the tools commonly used in image processing applications. Shape descriptors are regarded as mathematical functions employed for investigating image shape information. Various shape descriptors have been studied in the literature. The aim of this thesis is to develop new shape d

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2

Martinez-Ortiz, Carlos A. "2D and 3D shape descriptors." Thesis, University of Exeter, 2010. http://hdl.handle.net/10036/3026.

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The field of computer vision studies the computational tools and methods required for computers to be able to process visual information, for example images and video. Shape descriptors are one of the tools commonly used in image processing applications. Shape descriptors are mathematical functions which are applied to an image and produce numerical values which are representative of a particular characteristic of the image. These numerical values can then be processed in order to provide some information about the image. For example, these values can be fed to a classifier in order to assign

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3

Martinz-Ortiz, Carlos Andres. "2D and 3D shape descriptors." Thesis, University of Exeter, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535912.

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4

Lin, Cong. "Digital shape classification using local and global shape descriptors." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2492875.

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5

Di, Fabio Barbara <1977&gt. "Shape from Functions:Enhancing Geometrical-Topological Descriptors." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1961/1/TesiDiFabioPHD.pdf.

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Di, Fabio Barbara <1977&gt. "Shape from Functions:Enhancing Geometrical-Topological Descriptors." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1961/.

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7

Inan, Tolga. "3d Face Recognition With Local Shape Descriptors." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613835/index.pdf.

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This thesis represents two approaches for three dimensional face recognition. In the first approach, a generic face model is fitted to human face. Local shape descriptors are located on the nodes of generic model mesh. Discriminative local shape descriptors on the nodes are selected and fed as input into the face recognition system. In the second approach, local shape descriptors which are uniformly distributed across the face are calculated. Among the calculated shape descriptors that are discriminative for recognition process are selected and used for three dimensional face recognition. Both

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8

Milborrow, Stephen. "Multiview active shape models with SIFT descriptors." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22867.

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This thesis presents techniques for locating landmarks in images of human faces. A modified Active Shape Model (ASM [21]) is introduced that uses a form of SIFT descriptors [68]. Multivariate Adaptive Regression Splines (MARS [40]) are used to efficiently match descriptors around landmarks. This modified ASM is fast and performs well on frontal faces. The model is then extended to also handle non-frontal faces. This is done by first estimating the face's pose, rotating the face upright, then applying one of three ASM submodels specialized for frontal, left, or right three-quarter views. The mu

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Krantz, Amanda. "Temporal Multivariate Distribution Analysis of Cell Shape Descriptors." Thesis, Umeå universitet, Institutionen för fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-182264.

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In early drug discovery and the study of the effects of new chemical compounds on cancer cells, the change in cell shape over time provides vital information about cell health. Live-cell image analysis systems can be used to extract cell-shape describing parameters of individual cells during exposure to new drugs. Multivariate statistical analysis is then applied to understand cell morphology and the correlation between various shape descriptors. Principal component analysis integrated with histogram distribution analysis is a method to compress and summarize important cellular data features w

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10

Sivri, Erdal. "Shape Descriptors Based On Intersection Consistency And Global Binary Patterns." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614780/index.pdf.

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Shape description is an important problem in computer vision because most vision tasks that require comparing or matching visual entities rely on shape descriptors. In this thesis, two novel shape descriptors are proposed, namely Intersection Consistency Histogram (ICH) and Global Binary Patterns (GBP). The former is based on a local regularity measure called Intersection Consistency (IC), which determines whether edge pixels in an image patch point towards the center or not. The second method, called Global Binary Patterns, represents the shape in binary along horizontal, vertical, diagonal o

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11

ROBINETTE, KATHLEEN M. "AN INVESTIGATION OF 3-D ANTHROPOMETRIC SHAPE DESCRIPTORS FOR DATABASE MINING." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1069446990.

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12

Delsol, Claire. "Objective indentifcation weather systems in satellite imagery using fourier shape descriptors." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413932.

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13

MOREIRA, ANDRE DE SOUZA. "REVERSE ENGINEERING FOR CAD MODELS USING SHAPE DESCRIPTORS AND SUPPORT VECTOR MACHINE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=25821@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Modelos CAD 3D têm desempenhado um importante papel no gerenciamento de projetos de engenharia. Em vários desses modelos é perceptível a presença de diversos objetos com representações implícitas sendo representados por malhas triangulares. Ainda que apropriada para o rendering, a utilização de malhas triangulares traz consigo algumas desvantagens, como a ambiguidade em objetos pouco discretizados. A engenharia reversa visa a reconstrução dessa representação discreta em sua re

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14

Vladimir, Ilić. "Application of new shape descriptors and theory of uncertainty in image processing." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=111129&source=NDLTD&language=en.

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The doctoral thesis deals with the study of quantitative aspects of shape attribute ssuitable for numerical characterization, i.e., shape descriptors, as well as the theory of uncertainty, particularly the theory of fuzzy sets, and their application in imageprocessing. The original contributions and results of the thesis can be naturally divided into two groups, in accordance with the approaches used to obtain them. The first group of contributions relates to introducing new shape descriptors (of hexagonality and fuzzy squareness) and associated measures that evaluate to what extent the shape

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Guarnera, Giuseppe Claudio. "Shape Modeling and Description from 2D Images." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1365.

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L'abilità di vedere degli umani e degli animali è il risultato di una complessa interazione della luce con gli occhi ed il cervello. Non siamo coscienti di quanto estremamente complessa sia l'analisi delle forme degli oggetti che viene svolta dal nostro cervello, poiché questa viene prevalentemente svolta a livello subconscio, senza la necessità di richiedere l'intervento di più elevato livelli cognitivi. Pertanto, sebbene "vedere e comprendere" sembri semplice e naturale, la realizzazione di un sistema di Computer Vision versatile e robusto è un compito difficile. Nell'era dei computer, il te

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Sun, Bo [Verfasser], and Jianwei [Akademischer Betreuer] Zhang. "3D Global Shape Descriptors Applied in Scan Registration / Bo Sun. Betreuer: Jianwei Zhang." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://d-nb.info/1079655409/34.

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17

Mokhtari, Bilal. "Appariement de formes, recherche par forme clef." Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS067/document.

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Cette thèse porte sur l’appariement des formes, et la recherche par forme clef. Elle décrit quatrecontributions à ce domaine. La première contribution est une amélioration de la méthode des nuéesdynamiques pour partitionner au mieux les voxels à l’intérieur d’une forme donnée ; les partitionsobtenues permettent d’apparier les objets par un couplage optimal dans un graphe biparti. Laseconde contribution est la fusion de deux descripteurs, l’un local, l’autre global, par la règle duproduit. La troisième contribution considère le graphe complet, dont les sommets sont les formes dela base ou la re

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Yang, Xin Yu. "When Computers Can Discuss Shape Properties with Each Other." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2205.

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A novel idea for perception of object surfaces is presented by so called "shape descriptors". Such idea is as an abstract level to represent the object surface by some real numbers. It has the similar idea like as the Fourier coefficients of mapping a function f(x) to frequency domain by Fourier transform. The main goal of this thesis is to define some of the key issues in understanding of an object shape and also to find a modeling methodology to create the "shape descriptors". The modeling methodology is designed based on a variational interpolation technique. Such techni

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19

Eitz, Mathias [Verfasser], and Marc [Akademischer Betreuer] Alexa. "Human Object Sketches: Datasets, Descriptors, Computational Recognition and 3d Shape Retrieval / Mathias Eitz. Betreuer: Marc Alexa." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1029192820/34.

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20

Lingg, Andrew J. "An Algorithm for the Detection of Handguns in Terahertz Images." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229940968.

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21

K, C. Santosh. "Graphics Recognition using Spatial Relations and Shape Analysis." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL096N/document.

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Dans l’état de l’art actuel, la reconnaissance de symboles signifie généralement la reconnaissance des symboles isolés. Cependant, ces méthodes de reconnaissance de symboles isolés ne sont pas toujours adaptés pour résoudre les problèmes du monde réel. Dans le cas des documents composites qui contiennent des éléments textuels et graphiques, on doit être capable d’extraire et de formaliser les liens qui existent entre les images et le texte environnant, afin d’exploiter les informations incorporées dans ces documents.Liés à ce contexte, nous avons d’abord introduit une méthode de reconnaissance

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22

Fontaine, Fabien. "Development and applications of new 3D molecular descriptors." Doctoral thesis, Universitat Pompeu Fabra, 2005. http://hdl.handle.net/10803/7080.

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Con el fin de relacionar la estructura y la actividad de series de compuestos, es importante usar descriptores moleculares relevantes. Los descriptores GRIND y VolSurf pertenecen a una nueva familia de descriptores llamado libre de alineamiento. Es decir, que no necesitan alinear los compuestos con el fin de comparar sus campos de interacciones molecular. En este estudio se ha aplicado esos descriptores para la selección de reactivos químicos a partir de una amplia base de datos. La selección se ha echo mediante un protocolo que permite maximizar la diversidad de la muestra y así obtener unos

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23

Zouhar, Alexander. "Part-based recognition of 3-D objects with application to shape modeling in hearing aid manufacturing." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-192670.

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In order to meet the needs of people with hearing loss today hearing aids are custom designed. Increasingly accurate 3-D scanning technology has contributed to the transition from conventional production scenarios to software based processes. Nonetheless, there is a tremendous amount of manual work involved to transform an input 3-D surface mesh of the outer ear into a ﬁnal hearing aid shape. This manual work is often cumbersome and requires lots of experience which is why automatic solutions are of high practical relevance. This work is concerned with the recognition of 3-D surface meshes of

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24

De, Youngster Dela. "An Isometry-Invariant Spectral Approach for Macro-Molecular Docking." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/30226.

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Proteins and the formation of large protein complexes are essential parts of living organisms. Proteins are present in all aspects of life processes, performing a multitude of various functions ranging from being structural components of cells, to facilitating the passage of certain molecules between various regions of cells. The 'protein docking problem' refers to the computational method of predicting the appropriate matching pair of a protein (receptor) with respect to another protein (ligand), when attempting to bind to one another to form a stable complex. Research shows that matching th

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25

Lupinetti, Katia. "Identification of shape and structural characteristics in assembly models for retrieval applications." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0003/document.

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Au cours des dernières années, innombrables produits ont été conçus en utilisant des modèles numériques 3D, où les courants logiciels pour la conception et le dessin technique utilisent des modèles CAO (Conception Assistée par Ordinateur). Ces logiciels sont utilisés dans de nombreux domaines, tels que l'automobile, la marine, l'aérospatiale et plus encore. À l'intérieur de d'une entreprise qui utilise ces systèmes, il est possible d'avoir accès à des modèles CAO de produits déjà développés puisque la conception de nouveaux produits fait souvent référence à des modèles existants depuis que pro

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K, C. Santosh. "Graphics Recognition using Spatial Relations and Shape Analysis." Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL096N.

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Dans l’état de l’art actuel, la reconnaissance de symboles signifie généralement la reconnaissance des symboles isolés. Cependant, ces méthodes de reconnaissance de symboles isolés ne sont pas toujours adaptés pour résoudre les problèmes du monde réel. Dans le cas des documents composites qui contiennent des éléments textuels et graphiques, on doit être capable d’extraire et de formaliser les liens qui existent entre les images et le texte environnant, afin d’exploiter les informations incorporées dans ces documents.Liés à ce contexte, nous avons d’abord introduit une méthode de reconnaissance

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27

Das, Nivedita. "Modeling three-dimensional shape of sand grains using Discrete Element Method." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002072.

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28

Fredin, Patrik. "Correlation between Corneal Radius of Curvature and Corneal Eccentricity." Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-26486.

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Aim: The primary aim of this study was to find if there is any correlation between the corneal radius of curvature and its eccentricity. Method: 45 subjects participated in this study, 24 emmetropes, 18 myopes and three hyperopes. All subjects were free of ocular abnormalities and had no media opacities. All the subjects had normal ocular health and good visual acuity of 1.0 or better for both distance and near. The values for eccentricity and corneal radius of curvature were obtained by using a Topcon CA-100F Corneal Analyzer. Results: For the 4.5 mm zone the only significant correlation betw

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Rahim, Mehdi. "Caractérisation de la dynamique des déformations de contours. Application à l’imagerie pelvienne." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4336/document.

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Cette thèse présente une méthodologie appliquée à la caractérisation de la dynamique de structures déformables sur des séquences temporelles (2D+t). Des indicateurs sont proposés pour estimer la mobilité de formes non-rigides, à partir de leurs contours. Deux approches complémentaires sont développées: En premier lieu, les descripteurs de forme sont utilisés pour quantifier les déformations globales des formes, et pour estimer des repères géométriques spécifiques. La deuxième approche repose sur l'appariement difféomorphique pour déterminer une paramétrisation unifiée des formes, afin de décri

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Solis, Montero Andres. "Efficient Feature Extraction for Shape Analysis, Object Detection and Tracking." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34830.

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During the course of this thesis, two scenarios are considered. In the first one, we contribute to feature extraction algorithms. In the second one, we use features to improve object detection solutions and localization. The two scenarios give rise to into four thesis sub-goals. First, we present a new shape skeleton pruning algorithm based on contour approximation and the integer medial axis. The algorithm effectively removes unwanted branches, conserves the connectivity of the skeleton and respects the topological properties of the shape. The algorithm is robust to significant boundary noise

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Mahé, Kélig. "Sources de variation de la forme des otolithes : Implications pour la discrimination des stocks de poissons Identifying blue whiting (Micromesistius poutassou) stock structure in the Northeast Atlantic by otolith shape analysis. Otolith shape as a valuable tool to evaluate the stock structure of swordfish Xiphias gladius in the Indian Ocean Directional bilateral asymmetry in otolith morphology may affect fish stock discrimination based on otolith shape analysis Do environmental conditions (temperature and food composition) affect otolith shape during fish early-juvenile phase? An experimental approach applied to European Seabass (Dicentrarchus labrax)." Thesis, Littoral, 2019. http://www.theses.fr/2019DUNK0539.

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L’évaluation et la gestion des populations de poissons se basent sur l'utilisation d’unités de gestion appelées « stocks halieutiques ». Pour discriminer ces stocks, la forme des otolithes, pièces calcifiées de l’oreille interne des poissons, peut être utilisée. Dans ce contexte, cette thèse s'est consacrée premièrement à l’étude de la variabilité spatio-temporelle de la forme des otolithes chez 3 espèces de poissons présentant des caractéristiques écologiques (taille, vitesse de nage, comportement dans la colonne d’eau, etc.) et des environnements biogéographiques différents. Les résultats mo

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Wang, Lei [Verfasser], Horst [Akademischer Betreuer] [Gutachter] Hahn, Lars [Gutachter] Linsen, Dorit [Gutachter] Merhof, and Christian [Gutachter] Hansen. "Automated Medical Image Processing Using Efficient Shape Descriptors: Principles and Applications / Lei Wang ; Gutachter: Horst Hahn, Lars Linsen, Dorit Merhof, Christian Hansen ; Betreuer: Horst Hahn." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2017. http://d-nb.info/1141379678/34.

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Erpen, Luis Renato Cruz. "Reconhecimento de padrões em imagens por descritores de forma." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2004. http://hdl.handle.net/10183/27662.

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A idéia de capacitar uma máquina a reconhecer o ambiente em que atua tem motivado pesquisadores a investir esforços no estudo do mais complexo dos sentidos humanos, a visão. A visão é, antes de tudo, uma tarefa de representação e processamento de informações, sendo portanto adequada ao tratamento computacional. Visto que ainda não se possuem métodos que tenham resultados equivalentes ao que seria obtido com um usuário humano, tem-se estudado intensamente a utilização de feições para um melhor aproveitamento de seu potencial. Dentre estas feições, a forma de um objeto proporciona um poderoso in

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Filho, Carlos André Braile Przewodowski. "Feature extraction from 3D point clouds." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-30072018-111718/.

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Computer vision is a research field in which images are the main object of study. One of its category of problems is shape description. Object classification is one important example of applications using shape descriptors. Usually, these processes were performed on 2D images. With the large-scale development of new technologies and the affordable price of equipment that generates 3D images, computer vision has adapted to this new scenario, expanding the classic 2D methods to 3D. However, it is important to highlight that 2D methods are mostly dependent on the variation of illumination and col

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Billiot, Bastien. "Conception d'un dispositif d'acquisition d'images agronomiques 3D en extérieur et développement des traitements associés pour la détection et la reconnaissance de plantes et de maladies." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00983327.

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Dans le cadre de l'acquisition de l'information de profondeur de scènes texturées, un processus d'estimation de la profondeur basé sur la méthode de reconstruction 3D " Shape from Focus " est présenté dans ce manuscrit. Les deux étapes fondamentales de cette approche sont l'acquisition de la séquence d'images de la scène par sectionnement optique et l'évaluation de la netteté locale pour chaque pixel des images acquises. Deux systèmes d'acquisition de cette séquence d'images sont présentés ainsi que les traitements permettant d'exploiter celle-ci pour la suite du processus d'estimation de la p

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Nair, Binu Muraleedharan. "Learning Latent Temporal Manifolds for Recognition and Prediction of Multiple Actions in Streaming Videos using Deep Networks." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1429532297.

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Nohel, Michal. "Analýza časového vývoje léčených nádorů páteře v CT datech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442581.

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This diploma thesis is focused on time-development analysis of treated lesion in CT data. The theoretical part of the thesis deals with the anatomy, physiology, and pathophysiology of the spine and vertebral bodies. It further describes diagnostic and therapeutic options for the detection and treatment of spinal lesions. It contains an overview of the current state of usage of time-development analysis in oncology. The problems of the available databases are discussed and new databases are created for subsequent analysis. Futhermore, the methodology of time-development analysis according to th

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Freitas, Anderson Meirelles. "TSS e TSB: novos descritores de forma baseados em tensor scale." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-20122017-205014/.

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Neste trabalho são apresentados dois novos descritores de forma para tarefas de recuperação de imagens por conteúdo (CBIR) e análise de formas, que são construídos sobre uma extensão do conceito de tensor scale baseada na Transformada de Distância Euclidiana (EDT). Primeiro, o algoritmo de tensor scale é utilizado para extrair informações da forma sobre suas estruturas locais (espessura, orientação e anisotropia) representadas pela maior elipse contida em uma região homogênea centrada em cada pixel da imagem. Nos novos descritores, o limite do intervalo das orientações das elipses do modelo de

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Poleto, Arthur Suzini. "Desenvolvimento de um sistema de visão de máquina para inspeção de conformidade em um produto industrial /." Ilha Solteira, 2019. http://hdl.handle.net/11449/191137.

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Orientador: João Antonio Pereira<br>Resumo: Visão de máquina é um campo multidisciplinar que vem crescendo na indústria, que está cada vez mais preocupada em reduzir custos, automatizar processos, e atender requisitos de qualidade do produto para atender seus clientes. Processos de montagem realizados de forma manual com inspeção e controle visual são tipicamente processos susceptíveis a erros, à utilização de peças não conformes na montagem do produto final. Este trabalho apresenta uma proposta de desenvolvimento de um sistema de visão de máquina com base no processamento e análise de imagens

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Tsironis, P. "A shape descriptor for EEG analysis." Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374476.

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The Shape Descriptor is a tool for shape analysis of EEG data. It combines shape analysis of wave forms with medical knowledge of EEG features (spikes. slow waves and artifacts). Its contribution is that it optimizes human recognition by providing an accurate shape representation (slopes. durations. amplitudes) using mathematical criteria (error norm. randomness of error ete.) and offering valuable information about their structural properties. The Shape Descriptor has been implemented on a Unix system using Pascal language. The description of the EEG data by linear segments is achieved in two

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Ahmed, Fareed. "Un nouvel a priori de formes pour les contours actifs." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4008/document.

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Les contours actifs sont parmi les méthodes de segmentation d'images les plus utilisées et de nombreuses implémentations ont vu le jour durant ces 25 dernières années. Parmi elles, l'approche greedy est considérée comme l'une des plus rapides et des plus stables. Toutefois, quelle que soit l'implémentation choisie, les résultats de segmentation souffrent grandement en présence d'occlusions, de concavités ou de déformation anormales de la forme. Si l'on dispose d'informations a priori sur la forme recherchée, alors son incorporation à un modèle existant peut permettre d'améliorer très nettement

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Sowa, Timo. "Understanding coverbal iconic gestures in shape descriptions." Berlin Aka, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2770886&prov=M&dok_var=1&dok_ext=htm.

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Veselova, Olga 1980. "Perceptually based learning of shape descriptions for sketch understanding." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87863.

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Khoualed, Samir. "Descripteurs augmentés basés sur l'information sémantique contextuelle." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00853815.

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Les techniques de description des éléments caractéristiques d'une image sont omniprésentes dans de nombreuses applications de vision par ordinateur. Nous proposons à travers ce manuscrit une extension, pour décrire (représenter) et apparier les éléments caractéristiques des images. L'extension proposée consiste en une approche originale pour apprendre, ou estimer, la présence sémantique des éléments caractéristiques locaux dans les images. L'information sémantique obtenue est ensuite exploitée, en conjonction avec le paradigme de sac-de-mots, pour construire un descripteur d'image performant.

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Caetano, Felipe Andrade. "A video descriptor using orientation tensors and shape-based trajectory clustering." Universidade Federal de Juiz de Fora (UFJF), 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/4833.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-06-06T17:54:07Z No. of bitstreams: 1 felipeandradecaetano.pdf: 7461489 bytes, checksum: 93cea870d7bf162be4786d1d6ffb2ec9 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-06-07T11:06:08Z (GMT) No. of bitstreams: 1 felipeandradecaetano.pdf: 7461489 bytes, checksum: 93cea870d7bf162be4786d1d6ffb2ec9 (MD5)<br>Made available in DSpace on 2017-06-07T11:06:08Z (GMT). No. of bitstreams: 1 felipeandradecaetano.pdf: 7461489 bytes, checksum: 93cea870d7bf162be4786d1d6ffb2ec9 (MD5) Previous is

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Lazarou, Michalis. "A novel shape matching descriptor for real-time hand gesture recognition." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253265.

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In object recognition applications in computer vision, feature information extractedfrom images is used to dierentiate between objects. One of the mostimportant features that can be extracted from an object is its shape. ShapeMatching is a subset of object recognition methodology and is an area that hasattracted a lot of research interest over the years. Shape matching has showngreat potential in scenarios where images lack texture and colour informationor cannot be trained by learning models of feature combinations. However, themost accurate shape matching algorithms found in literature, such

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Stella, Federico. "Learning a Local Reference Frame for Point Clouds using Spherical CNNs." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20197/.

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Uno dei problemi più importanti della 3D Computer Vision è il cosiddetto surface matching, che consiste nel trovare corrispondenze tra oggetti tridimensionali. Attualmente il problema viene affrontato calcolando delle feature locali e compatte, chiamate descrittori, che devono essere riconosciute e messe in corrispondenza al mutare della posa dell'oggetto nello spazio, e devono quindi essere invarianti rispetto all'orientazione. Il metodo più usato per ottenere questa proprietà consiste nell'utilizzare dei Local Reference Frame (LRF): sistemi di coordinate locali che forniscono un'orientazione

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Labudová, Kristýna. "Rozpoznávání obrazů pro ovládání robotické ruky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316835.

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This thesis concerns with processing of embedded terminals’ images and their classification. There is problematics of moire noise reduction thought filtration in frequency domain and the image normalization for further processing analyzed. Keypoints detectors and descriptors are used for image classification. Detectors FAST and Harris corner detector and descriptors SURF, BRIEF and BRISK are emphasized as well as their evaluation in terms of potential contribution to this work.

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Connell, Jonathan Hudson. "Learning Shape Descriptions: Generating and Generalizing Models of Visual Objects." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/6870.

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We present the results of an implemented system for learning structural prototypes from grey-scale images. We show how to divide an object into subparts and how to encode the properties of these subparts and the relations between them. We discuss the importance of hierarchy and grouping in representing objects and show how a notion of visual similarities can be embedded in the description language. Finally we exhibit a learning algorithm that forms class models from the descriptions produced and uses these models to recognize new members of the class.

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Schmitt, Wagner. "A new 3D shape descriptor based on depth complexity and thickness information." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/127030.

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Modelos geométricos desempenham um papel fundamental em divérsas áreas, desde a indústria do entretenimento até aplicações científicas. Para reduzir o elevado custo de criação de um modelo 3D, a reutilização de modelos existentes é a solução ideal. Recuperação de modelos 3D utilizam técnicas baseadas em conteúdo (do inglês CBR) que auxiliam a busca de modelos desejados em repositórios massivos, muitos disponíveis publicamente na Internet. Pontos principais para técnicas CBR eficientes e eficazes são descritores de forma que capturam com precisão as características de uma forma 3D e são capazes

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