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Dissertations / Theses on the topic 'Triangulation'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Below, Alexander. "Complexity of triangulation /." [S.l.] : [s.n.], 2002. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14672.

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2

Pihlström, Max. "Visual representation by triangulation." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-264109.

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n this thesis the triangulation is treated as a general-purpose visual representation by investigation of various domain-specific methods such as triangulation interpolation, mesh flows, vertex neighborhood feature measures and re-triangulation for spatial transformations. Suggested new methods include an effective cost for image interpolation based on work by Sederberg et al. and a ridge-edge measure related to the Harris edge detector.

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3

Trisiripisal, Phichet. "Image Approximation using Triangulation." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33337.

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An image is a set of quantized intensity values that are sampled at a finite set of sample points on a two-dimensional plane. Images are crucial to many application areas, such as computer graphics and pattern recognition, because they discretely represent the information that the human eyes interpret. This thesis considers the use of triangular meshes for approximating intensity images. With the help of the wavelet-based analysis, triangular meshes can be efficiently constructed to approximate the image data. In this thesis, this study will focus on local image enhancement and mesh simplifica

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4

Mankiewicz, Piotr, Carsten Schuett, and schuett@math uni-kiel de. "On the Delone Triangulation Numbers." ESI preprints, 2000. ftp://ftp.esi.ac.at/pub/Preprints/esi952.ps.

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5

Benderius, Björn. "Laser Triangulation Using Spacetime Analysis." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10522.

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<p>In this thesis spacetime analysis is applied to laser triangulation in an attempt to eliminate certain artifacts caused mainly by reflectance variations of the surface being measured. It is shown that spacetime analysis do eliminate these artifacts almost completely, it is also shown that the shape of the laser beam used no longer is critical thanks to the spacetime analysis, and that in some cases the laser probably even could be exchanged for a non-coherent light source. Furthermore experiments of running the derived algorithm on a GPU (Graphics Processing Unit) are conducted with very pr

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6

Kyle, Stephen Alexander. "Triangulation methods in engineering measurement." Thesis, University College London (University of London), 1988. http://discovery.ucl.ac.uk/1318061/.

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Industrial surveying and photogrammetry are being increasingly applied to the measurement of engineering objects which have typical dimensions in the range 2-100 metres. Both techniques are examples of the principle of triangulation. By applying photocrammetric concepts to surveying methods and vice-versa, a general approach is established which has a number of advantages. In particular. alternative strategies for constructing and analysing measurement networks are developed. These should help to strengthen the geometry and simplify the analysis. The primary results concern the use of non-leve

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7

Jaw, Jen-Jer. "Control surface in aerial triangulation /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu148818889444039.

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8

Potter, John R. "Pseudo-triangulations on closed surfaces." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-021408-102227/.

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9

Pelegris, Gerasimos. "A triangulation method for passive ranging." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA284180.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Physics)--Naval Postgraduate School, June 1994.<br>Thesis advisor(s): Pieper, Ron J. ; Cooper, Wlfred W. "June 1994." Includes bibliographical references. Also available online.

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10

Lemaire, Christophe. "Triangulation de Delaunay et arbres multidimensionnels." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1997. http://tel.archives-ouvertes.fr/tel-00850521.

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Les travaux effectués lors de cette thèse concernent principalement la triangulation de Delaunay. On montre que la complexité en moyenne - en termes de sites inachevés - du processus de fusion multidimensionnelle dans l'hypothèse de distribution quasi-uniforme dans un hypercube est linéaire en moyenne. Ce résultat général est appliqué au cas du plan et permet d'analyser de nouveaux algorithmes de triangulation de Delaunay plus performants que ceux connus à ce jour. Le principe sous-jacent est de diviser le domaine selon des arbres bidimensionnels (quadtree, 2d-tree, bucket-tree. . . ) puis de

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11

Henry, G. K. "Three dimensional vision by laser triangulation." Thesis, University of Bath, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384100.

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12

Silva, Luis Fernando Maia Santos. "Merging meshes using dynamic regular triangulation." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/25512.

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Malhas simpliciais são utilizadas em várias áreas da Computação Gráfica e Engenharia, como por exemplo, em vizualização, simulação, prototipação, além de outras aplicações. Este tipo de malha é, geralmente, utilizada como aproximações discretas de espaços contínuos, onde eles oferecem representações flexíveis e eficientes. Muito esforço é gasto visando gerar malhas de boa qualidade, porém, em alguns casos as malhas acabam sendo modificadas. Entretanto, este tipo de operação é geralmente custosa e inflexível, o que pode resultar na geraão de malhas bem diferentes das originais. A habilidade de

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13

Veillet, Isabelle. "Triangulation spatiale de bloc d'images SPOT." Observatoire de Paris, 1991. https://hal.archives-ouvertes.fr/tel-02095460.

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Outre la qualité de ses images, l'atout majeur du système SPOT est sa précision géométrique. Cette étude a pour objet d'évaluer l'apport d'une triangulation de bloc au traitement géométrique d'images SPOT, afin de traiter globalement la géométrie de l'ensemble des images d'un chantier de spatiocartographie. Tant l'intérêt réel du calcul de blocs que sa faisabilité sont ici démontrés. Au préalable, il est indispensable d'analyser la modélisation de la prise de vues SPOT. Une modélisation simple, robuste et proche de la réalité physique de la prise de vues SPOT est proposée. Avec un nombre restr

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14

James, Steven Michael. "Triangulation and the Problem of Objectivity." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316500581.

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15

Nicander, Torun. "Indoor triangulation system using vision sensors." Thesis, Uppsala universitet, Signaler och system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-429676.

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This thesis aims to investigate a triangulation system for indoor positioning in two dimensions (2D). The system was implemented using three Pixy2 vision sensors placed on a straight baseline. A Pixy2 consists of a camera lens and an image sensor (Aptina MT9M114) as well as a microcontroller (NXP LPC4330), and other components. It can track one or multiple colours, or a combination of colours. To position an object using triangulation, one needs to determine the angles (α) to the object from a pair of known observing points (i.e., any pair of the three Pixy2s' placed in fixed positions on the

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16

Morris, Todd D. (Todd Douglas) Carleton University Dissertation Engineering Electrical. ""VLSI triangulation processing for machine vision."." Ottawa, 1987.

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17

Norström, Christer. "Underwater 3-D imaging with laser triangulation." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6125.

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<p>The objective of this master thesis was to study the performance of an active triangulation system for 3-D imaging in underwater applications. Structured light from a 20 mW laser and a conventional video camera was used to collect data for generation of 3-D images. Different techniques to locate the laser line and transform it into spatial coordinates were developed and evaluated. A field- and a laboratory trial were performed.</p><p>From the trials we can conclude that the distance resolution is much higher than the lateral- and longitudinal resolution. The lateral resolution can be improv

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18

Kakarlapudi, Geetha. "Analysis of beacon triangulation in random graphs." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1447.

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Our research focusses on the problem of finding nearby peers in the Internet. We focus on one particular approach, Beacon Triangulation that is widely used to solve the peer-finding problem. Beacon Triangulation is based on relative distances of nodes to some special nodes called beacons. The scheme gives an error when a new node that wishes to join the network has the same relative distance to two or more nodes. One of the reasons for the error is that two or more nodes have the same distance vectors. As a part of our research work, we derive the conditions to ensure the uniqueness of distanc

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19

Engman, Robin. "HPA* Used With a Triangulation-Based Graph." Thesis, Blekinge Tekniska Högskola, Institutionen för kreativa teknologier, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5630.

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Context: Pathfinding is an important phase when it comes to AI. The AI needs to know how to get from one point to another when there are obstacles ahead. For that reason, different pathfinding algorithms have been created. Objective: In this paper a new pathfinding algorithm, THPA*, is described, and it will also be compared to the more common algorithms, A*, and HPA* which THPA* is based on. Methods: These algorithms are then tested on an extensive array of maps with different paths and the results consisting of the execution times will be compared against each other. Results: The result of t

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20

Pihlström, Max. "The triangulation as an alternative painting medium." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208830.

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In as much as raster and vector graphics have complementary roles in digital imagery they both have limitations. In this paper, the two frameworks are in part bridged in the triangulation mesh where in particular the ideas of the spatial neighborhood and representation by geometrical primitives are combined. With a triangulation algorithm for preserving integrity of contour and color together with methods for introducing geometric detail and blending color, the end result is a configurable medium with qualities resembling those of physical paint, demonstrating potential as a viable alternative

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21

Borouchaki, Houman. "Graphe de connexion et triangulation de delaunay." Paris 7, 1993. http://www.theses.fr/1993PA077127.

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Une methode generale est presentee pour determiner l'enveloppe convexe d'un ensemble fini de points dans r#d. Pour definir la structure faciale d'un d-polytope, un nouveau graphe, dit de connexion, est introduit; il permet d'eviter les tris effectues pour la mise a jour des relations d'adjacence a chaque etape d'insertion de point; en ce sens cette methode fournit un automate pour la resolution du probleme. Cette methode est appliquee a une construction de l'i-dag propose par boissonnat et al. Les deux algorithmes sont de complexite optimale, en temps d'execution, dans leur version randomisee.

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22

Anderson, Ryan J. "Triangulation between Elderly Parents And Adult Children." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd904.pdf.

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23

Lam, Alice. "3D sound-source localization using triangulation-based methods." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63551.

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The localization of sound sources in a reverberant environment, such as a classroom or industrial workspace, is an essential first step toward noise control in these spaces. Many sound source localization techniques have been developed for use with microphone arrays. A common characteristic of these techniques is that they are able to provide the direction from which the sound is coming, but not the range (i.e. the distance between the source and receiver).This thesis presents two triangulation-based methods for localizing sound sources in 3D space, including range, using a small hemispherical

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24

Ebadi, Hamid. "A comprehensive study on GPS assisted aerial triangulation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24534.pdf.

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25

König, Sören, and Stefan Gumhold. "Robust Surface Triangulation of Points with Normal Information." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-131385.

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The problem of generating a surface triangulation from a set of points with normal information arises in several mesh processing tasks like surface reconstruction or surface resampling. In this paper we present a surface triangulation approach which is based on local 2d delaunay triangulations in tangent space. Our contribution is the extension of this method to surfaces with sharp corners and creases. We demonstrate the robustness of the method on difficult meshing problems that include nearby sheets, self intersecting non manifold surfaces and noisy point samples.

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26

Sheehy, Damian James. "Medial surface computation using a domain Delaunay triangulation." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239226.

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27

Chou, George Tao-Shun. "Large-scale 3D reconstruction : a triangulation-based approach." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86296.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (p. [153]-157).<br>by George Tao-Shun Chou.<br>Ph.D.

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28

Jayawardena, D. P. W. "The role of triangulation in spatial data handling." Thesis, Keele University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385666.

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29

König, Sören, and Stefan Gumhold. "Robust Surface Triangulation of Points with Normal Information." Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A27382.

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The problem of generating a surface triangulation from a set of points with normal information arises in several mesh processing tasks like surface reconstruction or surface resampling. In this paper we present a surface triangulation approach which is based on local 2d delaunay triangulations in tangent space. Our contribution is the extension of this method to surfaces with sharp corners and creases. We demonstrate the robustness of the method on difficult meshing problems that include nearby sheets, self intersecting non manifold surfaces and noisy point samples.

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30

Gholizadeh, Behrouz. "Représentation par triangulation de la surface d'objets tridimensionnels." Paris 11, 1985. http://www.theses.fr/1985PA112336.

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Dans cette thèse nous avons développé deux méthodes d’approximation des surfaces d'objets 3D dont la surface est échantillonnée par une centaine de milliers de points. Ces points sont répartis selon un maillage régulier de méridiens et de parallèles. Dans un premier temps nous nous sommes ramenés à une méthode assez simple de compression d'information par triangulation de l'objet à partir des coupes parallèles ou des coupes méridiennes. Cette technique est de mise en œuvre très simple, de coût informatique limité mais ses performances tant en compression qu'en fidélité de représentation sont é

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31

Linden, Timothy R. "A Triangulation-Based Approach to Nonrigid Image Registration." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1310502150.

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32

Boström, Viktor. "Positioning and tracking using image recognition and triangulation." Thesis, Uppsala universitet, Signaler och system, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448110.

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Triangulation is used in a wide range of applications of position estimation. Usually it is donebymeasuring angles by hand to estimate positions in land surveying, navigation and astronomy.Withthe rise of image recognition arises the possibility to triangulate automatically. The aim ofthis thesisis to use the image recognition camera Pixy2 to triangulate a target i threedimensions. It is basedon previous projects on the topic to extend the system to estimatepositions over a larger spaceusing more Pixy2s. The setup used five Pixy2s with pan-tilt kitsand one Raspberry Pi 4 B. Somelimitations to

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33

Kihl, Hilma, and Simon Källberg. "Simulated Laser Triangulation with Focus on Subsurface Scattering." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178132.

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Practical laser triangulation sessions were performed for each measurement object to obtain ground truth data. Three methods for laser line simulations were implemented: reshaping the built-in light sources of Blender, creating a texture projector and approximating a Gaussian beam as a light emitting volume. The camera simulation was based on the default camera of Blender together with settings from the physical camera. Three approaches for creating wood material were tested: procedural texturing, using microscopic image textures to create 3D-material and UV-mapping high resolution photograph

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34

Su, Dan. "Pixel level data-dependent triangulation with its applications." Thesis, University of Bath, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426147.

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35

Collier, Jeff. "Examining laser triangulation system performance using a software simulation." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176837151.

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36

Malek, Alaeddin. "The numerical approximation of surface area by surface triangulation /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65498.

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37

Rila, Luciano. "Coding of still images using irregular subsampling and triangulation." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268025.

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38

余康煒 and Hong-wai Yue. "Image morphing based on compatible triangulation and mesh interpolation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222122.

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39

Lattuada, Roberto. "A triangulation based approach to three dimensional geoscientific modelling." Thesis, Birkbeck (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312757.

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40

Parwana, Sudheer Singh. "Surface triangulation and the downstream effects on surface flattening." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1606/.

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Surface triangulation is an active area of research due to its wide usage in a range of different computer aided applications, including computer aided design (CAD), manufacture (CAM) and finite element analysis (FEA). Although these applications are used to create, interrogate, manipulate and analyse surfaces, internally they actually approximate the surface geometry using a triangulation and then operate on the triangles, making them triangulation dependant algorithms. However, despite the reliance on the triangulation by the downstream application, there is very little work which has been f

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41

Horeau, Mathieu. "Raison et absolu : histoire d'une triangulation (Kant, Hegel, Kierkegaard)." Paris 1, 2011. http://www.theses.fr/2011PA010537.

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Notre thèse examine la manière dont Kierkegaard a su s'approprier les grandes interrogations de la tradition philosophique à partir d'un ensemble de problèmes constitués sur le sol de l'idéalisme allemand. II s'agit de savoir si l'achèvement hégélien de la métaphysique n'accomplit la philosophie que pour en faire un dogmatisme supérieur. En identifiant la raison et l'absolu, que Kant avait radicalement dissociés, Hegel surmonte toute dévaluation sceptique du discours philosophique. Mais à quel prix ? Réactivant certains arguments kantiens sans pourtant faire retour à Kant, la pensée paradoxale

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42

Lau, Yan Nam. "Adaptive approach to triangulation of isosurface in volume data /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?COMP%202002%20LAUY.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2002.<br>Includes bibliographical references (leaves 91-95). Also available in electronic version. Access restricted to campus users.

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43

Yue, Hong-wai. "Image morphing based on compatible triangulation and mesh interpolation /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20731590.

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44

Hogan, William Robertson Sean. "An efficient method for finding the Delaunay triangulation of randomly scattered data with applications in contour plotting /." Thesis, Connect to Dissertations & Theses @ Tufts University, 1994.

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Thesis (Ph.D.)--Tufts University, 1994.<br>Submitted to the Dept. of Electrical Engineering. Includes bibliographical references (leaves 69-70). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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45

Iordanov, Iordan. "Delaunay triangulations of a family of symmetric hyperbolic surfaces in practice." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0010.

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La surface de Bolza est la surface hyperbolique orientable compacte la plus symétrique de genre 2. Pour tout genre supérieur à 2, il existe une surface orientable compacte construite de manière similaire à la surface de Bolza et ayant le même type de symétries. Nous appelons ces surfaces des surfaces hyperboliques symétriques. Cette thèse porte sur le calcul des triangulations de Delaunay (TD) de surfaces hyperboliques symétriques. Les TD de surfaces compactes peuvent être considérées comme des TD périodiques de leur revêtement universel (dans notre cas, le plan hyperbolique). Une TD est pour

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46

Pébay, Philippe. "Delaunay-admissiblité en dimensions 2 et 3." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2000. http://tel.archives-ouvertes.fr/tel-00607168.

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La méthode des éléments finis, largement utilisée en analyse numérique, requiert que le domaine considéré soit préalablement maillé, c'est-à-dire partitionné en un ensemble de polytopes généralement, mais pas nécessairement, simpliciaux. Parmi les méthodes permettant la génération de tels maillages, la triangulation de Delaunay présente le double intérêt d'avoir un support théorique fondant la robustesse des algorithmes, ainsi que de produire des éléments de qualité, conditionnant fortement la précision des calculs ultérieurs. Elle présente cependant l'inconvénient de ne pas être à même de pre

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Pébay, Philippe. "Delaunay-admissibilité a priori en dimensions 2 et 3." Paris 6, 2000. http://www.theses.fr/2000PA066588.

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48

Kaykobad, M. Tanvir. "Transforming Plane Triangulations by Simultaneous Diagonal Flips." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40499.

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We explore the problem of transforming plane triangulations using simultaneous diagonal flips. Wagner showed that any n-vertex plane triangulation can be transformed to any other plane triangulation on equal number of vertices using a finite sequence of diagonal flips. Later on it has been established that O(n) individual flips suffice to complete this transformation. Bose et al. showed that the transformation can also be done in 4 × ( 2 / log 54/53 + 2 / log 6/5 ) logn + 2 ≈ 327.1 log n simultaneous flips. This bound is asymptotically tight. We present two algorithms to improve th

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49

Bridges, Monte Lee. "Superintendent evaluation for increased organizational performance : from traits to triangulation /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/7813.

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50

Forest, Collado Josep. "New Methods for Triangulation-based Shape Acquisition using Laser Scanners." Doctoral thesis, Universitat de Girona, 2004. http://hdl.handle.net/10803/7730.

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Tradicionalment, la reproducció del mon real se'ns ha mostrat a traves d'imatges planes. Aquestes imatges se solien materialitzar mitjançant pintures sobre tela o be amb dibuixos. Avui, per sort, encara podem veure pintures fetes a ma, tot i que la majoria d'imatges s'adquireixen mitjançant càmeres, i es mostren directament a una audiència, com en el cinema, la televisió o exposicions de fotografies, o be son processades per un sistema computeritzat per tal d'obtenir un resultat en particular. Aquests processaments s'apliquen en camps com en el control de qualitat industrial o be en la recerca

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