Thèses sur le sujet « Structured light 3D scanning »
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Törnblom, Nils. « Underwater 3D Surface Scanning using Structured Light ». Thesis, Uppsala universitet, Centrum för bildanalys, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-138205.
Texte intégralSchmalz, Christoph [Verfasser], et Joachim [Akademischer Betreuer] Hornegger. « Robust Single-Shot Structured Light 3D Scanning = Robuste 3D-Vermessung mit strukturierter Beleuchtung in Einzelbildern / Christoph Schmalz. Betreuer : Joachim Hornegger ». Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2012. http://d-nb.info/1021570842/34.
Texte intégralBátrla, Martin. « Výzkumný 3D skener pro účely skenování problematických povrchů ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401059.
Texte intégralHolland, Andrew D. « Examining the taphonomic challenges to the 3D digitisation of fragmented bone ». Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/15180.
Texte intégralHoltzhausen, Stefan. « Erfassungsplanung nach dem Optimierungsprinzip am Beispiel des Streifenprojektionsverfahrens ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-173373.
Texte intégralWu, Christy. « Reverse Engineering med hjälp av 3D-skanning ». Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-185789.
Texte intégralIn the field of mechanical engineering, there is an increasing interest in Reverse Engineering using 3D-scanning. The technology is based on creating Computer-Aided-Design (CAD) models of real objects. The present project was carried out at the Department of Applied Physics and Electronics at Umeå University in order to evaluate the performance of Reverse Engineering of objects that are challenging to draw directly in CAD programs. Four different physical objects were selected for analysis: a bolt, a hex socket, a propeller and a worm wheel; the latter provided by the company Rototilt Group AB. A structured light 3D-scanner with a specified accuracy of 0,04 mm was used to image the objects. The 3D images were then post-processed and transferred to CAD software to create the CAD drawings. Finally, the CAD-models were printed with a 3D printer and a tolerance analysis with a limit of 0,2 mm was performed to compare the dimensions of the original objects, the different digital models and the printed objects. The results show that Reverse Engineering (with some limitations) is a good method for objects that are difficult to model in CAD. The technique is well-suited to reconstruct physical objects into CAD-models quickly and with high accuracy.
Walter, Viktor. « Projekce dat do scény ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-240823.
Texte intégralChakib, Reda. « Acquisition et rendu 3D réaliste à partir de périphériques "grand public" ». Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0101/document.
Texte intégralDigital imaging, from the synthesis of images to computer vision isexperiencing a strong evolution, due among other factors to the democratization and commercial success of 3D cameras. In the same context, the consumer 3D printing, which is experiencing a rapid rise, contributes to the strong demand for this type of camera for the needs of 3D scanning. The objective of this thesis is to acquire and master a know-how in the field of the capture / acquisition of 3D models in particular on the rendered aspect. The realization of a 3D scanner from a RGB-D camera is part of the goal. During the acquisition phase, especially for a portable device, there are two main problems, the problem related to the repository of each capture and the final rendering of the reconstructed object
Robinson, Alan. « Surface scanning with uncoded structured light sources ». Thesis, Sheffield Hallam University, 2005. http://shura.shu.ac.uk/20284/.
Texte intégralPistellato, Mara <1991>. « Structured-light 3D reconstruction and applications ». Doctoral thesis, Università Ca' Foscari Venezia, 2019. http://hdl.handle.net/10579/17850.
Texte intégralSattari, Amir. « Investigations of Flow Patterns in Ventilated Rooms Using Particle Image Velocimetry : Applications in a Scaled Room with Rapidly Varying Inflow and over a Wall-Mounted Radiator ». Doctoral thesis, KTH, Installations- och energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167804.
Texte intégralDet övergripande syftet med den första studien i avhandlingen var att undersöka hypotesen att ett pulserande inflöde till ett ventilerade utrymme har en potential till att förbättra ventilationens kvalitet genom att minska stagnationszoner och därigenom öka omblandningen. För genomförande av studien byggdes en experimentuppställning i form av en tvådimensionell (2D) småskalig modell av ett ventilerat rum. Strömningsmediet i modellen var vatten. Det tvådimensionella hastighetsfältet registrerades över hela modellen med hjälp av Particle Image Velocimetry (PIV). Vid ett stationärt tillflöde bildas ett stagnationsområde i centrum av rumsmodellen. Vid ett pulserade inflöde genererades sekundära virvlar. Med en egen utvecklad programvara var det möjligt att kvantifiera statistiken hos virvlarna. Det pulserade inflödet gjorde att inom området där det vid stationärt tillflöde fanns en stagnationszon ökade antalet virvlar i alla storlekar och fördelningen av virvlar blev mera homogen än tidigare. Detta kan förväntas ge upphov till förbättrad omblandning. Baserat på en grundläggande experimentell studie utförd i en småskalig tvådimensionell rumsmodell med vatten som strömningsmedium kan vi logiskt dra slutsatsen att ett pulserande tilluftsflöde har en potential att förbättra omblandningen. I en fortsatt studie i avhandlingen visuliserades och mättes hastighetsfältet och därefter beräknades statistiska värden av exempelvis medelhastighet, standardavvikelse och skjuvspänning hos hastighetsfluktuationerna i luftströmmen över en väggmonterad radiator med 2D-PIV-teknik. Bakgrunden till studien är att en bidragande orsak till partikelavsättning på väggytor är turbofores som uppträder vid en turbulent luftström. Studien genomfördes genom uppbyggnad av en fullskalig rumsmodell. Eftersom turbulens spelar en roll vid partikelavsättning genom turbofores är det viktigt att identifiera var det laminära flödet över radiatorn blir turbulent. Resultaten baserat på visualisering och PIV-mätningar indikerade att, för ett rum med denna typ av radiatoruppvärmning, blev flödet över radiatorn turbulent efter en dimensionslös längd lika med 5,0‒6,25 gånger radiatorns tjocklek. Ytors egenskaper är viktiga vid partikelavsättning. Därför har de geometriska egenskaperna hos några olika metoder för ytbehandling undersökts experimentellt med hjälp av en scanner för strukturerat 3D-ljus. Resultaten visar på skillnader i ytråhet hos de olika ytbehandlingsmetoderna. För att undersöka motståndet mot luftströmning längs ytan och den turbulens som genereras av ytorna registrerade vi gränsskiktsflödet över ytorna i en speciell luftströmningsrigg. Detta påvisade att motståndet hos de olika typerna av ytbehandlingsmetoder skilde sig mycket litet åt och därför är troligt vid deras påverkan på depositionshastigheten mycket liten.
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McCowen, Douglas H. L. « Efficient 3D object recognition with structured light ». Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282209.
Texte intégralPagès, Marco Jordi. « Assisted visual servoing by means of structured light ». Doctoral thesis, Universitat de Girona, 2005. http://hdl.handle.net/10803/7882.
Texte intégralEn primer lloc, es presenta un ampli estudi de la llum estructurada, el qual ens permet proposar un nou patró codificat que millora els existents. La resta de la tesi es concentra en el posicionament d'un robot dotat d'una càmara respecte diferents
objectes, utilitzant la informació proveïda per la projecció de diferents patrons de llum. Dos configuracions han estat estudiades: quan el projector de llum es troba separat del robot,
i quan el projector està embarcat en el robot juntament amb la càmara. Les tècniques proposades en la tesi estan avalades per un ampli estudi analític i validades per resultats experimentals.
This thesis treats about the combination of visual servoing and structured light. Classic visual servoing assumes that visual features can be extracted from the images. However, uniform or
non-textured objects, or objects for which extracting features is too complex or too time consuming cannot be taken into account.
This thesis proposes the use of structured light patterns for providing suitable visual features independently of the object appearance.
Firstly, a comprehensive survey on coded structured light patterns is presented. Then, a new pattern improving the existing ones is
proposed. The remaining of the thesis is devoted to position an eye-in-hand robot with respect to objects by using features provided by light patterns. Two configurations are tested. In the
first one, an off-board video-projector is used while in the second, an onboard structured light emitter is exploited. The techniques proposed in the thesis are supported by theoretical
analysis and they are validated by experimental results.
Nordmark, Anton. « Kinect 3D Mapping ». Thesis, Linköpings universitet, Datorseende, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85158.
Texte intégralOzturk, Oguz Ahmet. « 3d Face Reconstruction Using Stereo Images And Structured Light ». Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12609015/index.pdf.
Texte intégralBevilacqua, Maurizio. « Novel models and methods for structured light 3D Scanners ». Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/289.
Texte intégralThe work made during the PhD course in Information Engineering, was focused on the possibility to find out novel techniques for the quick calibration of a cheap 3D Scanner. It is based on a simple camera and a commercial projector, in order to develop low-cost devices with high reliability capable of acquiring large areas quickly. Many systems based on this configuration exist, those devices have benefits and disadvantages. They can acquire objects with large surface in a few seconds and with an adequate accuracy. On the other hand, they need a lengthy calibration and they are very sensitive to the noise due to the flicker of the light source. Considering these problems, I tried to find new robust calibration techniques in order to reduce the sensitivity to noise, and, in this way, to have high-performance low-cost 3D scanners with short-time calibration and reconfiguration. There are many calibration techniques available for these systems. First, it is necessary to calibrate the camera and then the overall system for projecting analog encoded patterns, typically sinusoidal or digital, such as Gray codes. These techniques are very time-consuming because they require a prior camera calibration phase separate from the calibration of the whole system and also disturbing factors are introduced by the ambient light noise. Indeed, a lot of projection patterns, used to map the calibration volume, are required to be projected. In order to achieve our goal, different types of structured light scanner have been studied and implemented, according to the schemes proposed in literature. For example, there exist scanners based on sinusoidal patterns and others based on digital patterns, which also allowed the implementation in real time mode. On these systems classical techniques of calibration were implemented and performance were evaluated ad a compromise between time and accuracy of the system. Classical calibration involves the acquisition of phase maps in the volume calibration following a pre-calibration of the camera. At the beginning, an algorithm that allows calibration through the acquisition of only two views has been implemented, including camera calibration, modeled by pin-hole model, in the calibration algorithm. To do this, we have assumed a geometric model for the projector which has been verified by the evaluation of experimental data. The projector is then modeled as a second camera, also using the pin-hole model, and we proceeded with the calibration of camera-projector pair as a pair of stereo cameras, using a DLT calibration. Thanks to the acquisition of two views of the target volume in the calibration, it is possible to extract the parameters of the two devices through which the projected pattern can be generated, and the acquisition by the camera can be done, eliminating the problem of noise due to ambient light. This system is a good compromise between the reduction in calibration time, which passed from half an hour to a couple of minutes, with a reduction in term of uncertainty in order of one percentage point of calibration volumes that was chosen of a depth of 10 centimeters… [edited by author]
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Gupta, Pratibha. « Gray Code Composite Pattern Structured Light Illumination ». UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/438.
Texte intégralSakr, Ziad. « 3D object recognition using pseudo-random color encoded structured light ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0015/MQ57174.pdf.
Texte intégralRadu, Orghidan. « Catadioptric stereo based on structured light projection ». Doctoral thesis, Universitat de Girona, 2006. http://hdl.handle.net/10803/7733.
Texte intégralS'ha realitzat un estudi sobre els sistemes de visió omnidireccional. S'han avaluat vàries configuracions estèreo i s'ha escollit la millor. Els paràmetres del model són difícils de mesurar directament i, en conseqüència, s'ha desenvolupat una sèrie de mètodes de calibració.
Els resultats obtinguts són prometedors i demostren que el sensor pot ésser utilitzat en aplicacions per a la percepció de la profunditat com serien el modelatge de l'escena, la inspecció de canonades, navegació de robots, etc.
Vision perception is enhanced when a large field of view is available. This thesis is focused on the visual perception of depth by means of omnidirectional cameras. The 3D sensing is obtained in computer vision by means of stereo configurations with the drawback of feature matching between images. The solution offered in this dissertation uses structured light projection for solving the matching problem.
First, a survey on omnidirectional vision systems was realized. Then, the sensor design was addressed and the particular stereo configuration of the proposed sensor was decided. An accurate model is obtained by a careful study of both components of the sensor. The model parameters are measured by a set of calibration methods.
The results obtained are encouraging and prove that the sensor can be used in depth perception applications such as scene modeling, pipe inspections, robot navigation, etc.
Pethe, Akshay. « SUPER RESOLUTION 3D SCANNING USING SPATIAL LIGHT MODULATOR AND BAND CORRECTION ». UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/550.
Texte intégralPethe, Akshay Gajanan. « Super resolution 3D scanning using spatial light modulator and band correction / ». Lexington, Ky. : [University of Kentucky Libraries], 2008. http://hdl.handle.net/10225/936.
Texte intégralTitle from document title page (viewed on December 10, 2008). Document formatted into pages; contains: ix, 76 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 74-75).
Zhang, Haolin. « 3D surface shape measurement using stereoscopic camera based structured light systems ». Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/670112.
Texte intégralLa medición de luz estructurada nos permite obtener la forma tridimensional de la superficie de un objeto con alta precisión. Por lo tanto, encuentra amplias aplicaciones en aplicaciones industriales. Además, al proyectar patrones de franjas digitales en el objeto medido, la luz estructurada garantiza una medición de superficie flexible. Por otro lado, la luz estructurada también nos permite medir objetos especulares y objetos difusores. Para la medición de objetos especulares, se introduce la deflectometría. Aquí, los patrones marginales son generados por una pantalla de cristal líquido (LCD). Para la medición de objetos difusores, se introduce la profilometría. En esta técnica, los patrones marginales son proyectados por un video proyector. En esta tesis, en primer lugar, proponemos un sistema de deflectometría de medición de fase estereoscópica (SPMD), que contiene dos cámaras y una pantalla LCD comercial, para cumplir con la medición del objeto especular. En particular, al introducir la cámara estereoscópica, se elimina la ambigüedad no deseada de altura normal sin mover ningún componente del sistema. Aquí, proponemos un algoritmo de minimización de error de fase, que se cumple buscando la diferencia de fase mínima entre los píxeles correspondientes de la pantalla LCD y la cámara, para determinar simultáneamente la superficie normal y la altura. Además, para lograr una minimización de fase eficiente, utilizamos un método de ajuste polinómico. Finalmente, la integración bidimensional de Fourier se utiliza para reconstruir la forma de la superficie especular. Además de la medición de superficie especular con deflectometría, también proponemos un sistema de perfilometría de proyección de franja estereoscópica (SFPP) para lograr la medición de la forma de la superficie del objeto difusor. En particular, un sistema SFPP utiliza la misma cámara estereoscópica que en la configuración de deflectometría, pero adopta un proyector de video para reemplazar la pantalla LCD y proyectar los patrones marginales. Al presentar la cámara estereoscópica, evitamos la compleja calibración del proyector de video y, por lo tanto, se logra una gran flexibilidad del sistema. Para la reconstrucción de la superficie, la triangulación geométrica se implementa mediante la realización de una interpolación de subpíxeles 2D, desde la cual mejoramos la precisión de la reconstrucción de la superficie. Los dos sistemas mencionados anteriormente solo nos permiten medir la forma de la superficie de un objeto especular o difusor, pero muestran insuficiencias para medir un objeto híbrido especular-difusor. Bajo este escenario, combinamos ambos sistemas para realizar la medición de objeto híbrido especular-difusor. Aquí, un sistema híbrido de deflectometría-profilometría estereoscópica (SDPH) contiene la cámara estereoscópica, un LCD y un proyector de video. En este caso, este sistema híbrido supera la insuficiencia de los sistemas de luz estructurada de proyección única, ya que no solo garantiza la medición de objetos especulares o difusores, sino que también permite la medición de objetos híbridos especulares-difusores. Por lo tanto, la aplicación de la medición de luz estructurada se amplía aún más. En resumen, demostramos en esta tesis tres sistemas de luz estructurada basados en cámaras estereoscópicas para realizar mediciones tridimensionales de la forma de la superficie. Estos sistemas estereoscópicos revelan un gran potencial, ya que son capaces de medir las formas superficiales de objetos especulares, objetos difusores e incluso objetos híbridos de difusor especular con alta resolución. Los sistemas propuestos podrían ser beneficiosos en diversas aplicaciones industriales, donde se requiere un sistema preciso de medición de la forma de la superficie con un esquema fácil de implementar.
Structured light measurement allows us to obtain three-dimensional surface shape of an object with high accuracy. Thus, it finds extensive applications in industrial applications. Moreover, by projecting digital fringe patterns to the measured object, structured light guarantees a flexible surface measurement. On the other hand, structured light also allows us to measure both specular objects and diffuser objects. For specular object measurement, deflectometry is introduced. Here, the fringe patterns are generated by a liquid crystal display (LCD). For diffuser object measurement, profilometry is introduced. In this technique, the fringe patterns are projected by a video projector. In this thesis, we firstly propose a stereoscopic phase measuring deflectometry (SPMD) system, which contains two cameras and a commercial LCD, to fulfill the specular object measurement. In particular, by introducing the stereoscopic camera, the undesired height-normal ambiguity is eliminated without moving any system component. Here, we propose a phase error minimization algorithm, which is fulfilled by searching the minimum phase difference between the corresponding pixels of the LCD and the camera, to simultaneously determine the surface normal and height. What is more, to accomplish an efficient phase minimization, we use a polynomial fitting method. Finally, two-dimensional Fourier integration is used to reconstruct the specular surface shape. Apart from the specular surface measurement with deflectometry, we also propose a stereoscopic fringe projection profilometry (SFPP) system to accomplish the diffuser object surface shape measurement. In particular, an SFPP system uses the same stereoscopic camera as in the deflectometry set-up, but it adopts a video projector to replace the LCD to project the fringe patterns. By introducing the stereoscopic camera, we avoid the complex video projector calibration, and thus, a great system flexibility is achieved. For surface reconstruction, geometric triangulation is implemented by performing a 2D sub-pixel interpolation, from which we enhance the surface reconstruction accuracy. The aforementioned two systems enable us only to measure the surface shape of either a specular or a diffuser object, but they show inadequacies to measure a specular-diffuser hybrid object. Under this scenario, we combine both systems to perform the specular-diffuser hybrid object measurement. Here, a stereoscopic deflectometry-profilometry hybrid (SDPH) system contains the stereoscopic camera, an LCD and a video projector. In this case, this hybrid system overcomes the inadequacy of single projection structured light systems, as it not only ensures to measure specular or diffuser object, but it also allows the measurement of specular-diffuser hybrid objects. Hence, the application of structured light measurement is further broadened. In summary, we demonstrate in this thesis three stereoscopic camera based structured light systems to perform three-dimensional surface shape measurement. These stereoscopic systems reveal great potential as they are able to measure the surface shapes of specular objects, diffuser objects and even specular-diffuser hybrid objects with high resolution. The proposed systems could be beneficial in various industrial applications, where an accurate surface shape measurement system with an easy implemented scheme is required.
Lavoie, Philippe. « A NURBS based 3D object reconstruction using colour-coded structured light ». Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29132.
Texte intégralRamsay, Robert. « A Hardware Based 3D Room Scanner ». Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1240.
Texte intégralCasey, Charles Joseph. « ENHANCEMENTS TO THE MODIFIED COMPOSITE PATTERN METHOD OF STRUCTURED LIGHT 3D CAPTURE ». UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/226.
Texte intégralZhang, Yujia. « A Structured Light Based 3D Reconstruction Using Combined Circular Phase Shifting Patterns ». The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546488253821736.
Texte intégralCavaturu, Raja Kalyan Ram. « Motion Correction Structured Light using Pattern Interleaving Technique ». UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/551.
Texte intégralLuo, Ming. « Optical Analysis and Opto-Mechanical Design for Miniaturized Laser Illumination Module in 3D Areal Mapper ». Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33169.
Texte intégralMaster of Science
Fernández, Navarro Sergio. « One-shot pattern projection for dense and accurate 3D reconstruction in structured light ». Doctoral thesis, Universitat de Girona, 2012. http://hdl.handle.net/10803/83621.
Texte intégralEsta tesis estudia el problema de la reconstrucción 3D con Luz Estructurada (LE). En LE se proyecta un patrón en la superficie del objecto, a fin de incrementar la textura y el número de correspondencias con la imagen capturada, de la que se extrae la información 3D. Actualmente se trabaja en soluciones de LE para entornos moviles. La tesis presenta un compendio de las principales tecnicas en LE. Además, se estudian en detalles las dos propuestas de análisis frecuencial, proponiendo un algoritmo para el análisis del patrón capturado. Con ésto, se propone un método de un único patrón proyectado, obteniendo reconstrucción densa. La técnica se basa en WFT combinado con codificación DeBruijn. Los resultados muestran niveles de precisión comparables con otras técnicas DeBruijn, pero obteniendo reconstrucción densa. Finalmente, se estudia el problema de registro de reconstrucciones LE.
Guo, Haiyun. « Applications of Structured Light to 3D Surface Topography Using Moire Pattern and to 3D Imaging of Phase Objects ». University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1628255378782863.
Texte intégralPiétu, Claire. « 3D Virtual Reconstruction with Structured Light Techniquesand its Use in Augmented Reality Mobile Applications ». Thesis, KTH, Tillämpad fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146189.
Texte intégralToony, Zahra. « Extracting structured models from raw scans of manufactured objects : a step towards embedded intelligent handheld 3D scanning ». Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26270.
Texte intégralThe availability of fast and accurate 3D sensors has favored the development of different applications in assembly, inspection, Computer-Aided Design (CAD), reverse engineering, mechanical engineering, medicine, and entertainment, to list just a few. While 2D cameras capture 2D images of the surface of objects, either black-and-white or color, 3D cameras provide information on the geometry of an object surface. Today, newly introduced 3D cameras can acquire the appearance and geometry of objects concurrently. The popularity and availability of such these 3D models has opened new fields of interests, such as 3D model segmentation, 3D model recognition, estimation of 3D models’ parameters and even 3D modelling. In this project, we aim at recognizing different parts (primitives) of a 3D object, intelligently. For this purpose, we first prepare a database of 3D CAD primitives (i.g. planes, cylinders, cones, spheres and, tori). Then using segmentation algorithms, the complex objects are decomposed into their primitives and, by utilizing recognition techniques, a descriptor is extracted and associated to each primitive and, finally, a classifier is trained to learn the properties of primitives. The manuscript investigates different methods related to these challenges. An additional step is also proposed in this project which estimates the parameters of primitives and generate the CAD primitives that completes the whole process of reverse engineering.
Dikmen, Mehmet. « 3d Face Reconstruction Using Stereo Vision ». Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607543/index.pdf.
Texte intégral#8217
s face. It is seen that using projection pattern also provided enough feature points to derive 3D face roughly. These points are then used to fit a generic face mesh for a more realistic model. To cover this 3D model, a single texture image is generated from the initial stereo photographs.
Boyer, Alain. « Adaptive Structured Light Imaging with Exposure and Focus Fusion for 3D Reconstruction and Autonomous Robotic Exploration ». Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28931.
Texte intégralSpours, J. « The use of a structured laser light system to ascertain three dimensional measurements of underwater work sites ». Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341127.
Texte intégralChyou, Te-yu. « A 3D Computer Vision System in Radiotherapy Patient Setup ». Thesis, University of Canterbury. Physics and Astronomy, 2012. http://hdl.handle.net/10092/7176.
Texte intégralKotek, Lukáš. « Zubní 3D skener ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221389.
Texte intégralBoyanapally, Deepthi. « MERGING OF FINGERPRINT SCANS OBTAINED FROM MULTIPLE CAMERAS IN 3D FINGERPRINT SCANNER SYSTEM ». UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/510.
Texte intégralRomanovský, Jiří. « 3D skener pro výukové účely ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318656.
Texte intégralZervas, Michael Jay. « Development of a High Speed, Robust System for Full Field-of-View 3D Shape Measurements ». Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/984.
Texte intégralYalla, Veeraganesh. « OPTIMAL PHASE MEASURING PROFILOMETRY TECHNIQUES FOR STATIC AND DYNAMIC 3D DATA ACQUISITION ». UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/348.
Texte intégralMandava, Neelima. « COLOR MULTIPLEXED SINGLE PATTERN SLI ». UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/568.
Texte intégralMertens, Benjamin. « Bringing 3D and quantitative data in flexible endoscopy ». Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209275.
Texte intégralIn this thesis, a contribution to more a robust 3D reconstruction endoscopic device is proposed. Structured light technique is used and implemented using a diffractive optical element. Two patterns are developed and compared: the first is based on the spatial-neighbourhood coding strategy, the second on the direct-coding strategy. The latter is implemented on a diffractive optical element and used in an endoscopic 3D reconstruction device. It is tested in several conditions and shows excellent quantitative results but the robustness against bad visual conditions (occlusions, liquids, specular reflection,) must be improved.
Based on this technology, an endoscopic ruler is developed. It is dedicated to answer endoscopists lack of measurement system. The pattern is simplified to a single line to be more robust. Quantitative data show a sub-pixel accuracy and the device is robust in all tested cases. The system has then been validated with a gastroenterologist to measure polyps. Compared to literature in this field, this device performs better and is more accurate.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Mosnier, Jérémie. « Etalonnage d'un système de lumière structurée par asservissement visuel ». Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22194.
Texte intégralThis thesis is part of a national project named SRDViand whose aim was to develop a robotic system for the deboning and cutting of animals meat. To determine the cut paths, a structured light system has been developed. It refers to vision systems that use light projection models for 3D reconstruction tasks. To achieve best results, the definition of a new calibration method for structured light systems was established . Based on a large state of the art and also with a proposed classification of these methods, it has been proposed to calibrate a camera projector pair using visual servoing . The validity and the results of this method were tested on the basis of numerous experimental tests conducted under the SRDViand project. Following the development of this method, a prototype bovine cutting was performed
Shelley, Anthony N. « MONITORING DAIRY COW FEED INTAKE USING MACHINE VISION ». UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/24.
Texte intégralBelander, West Markus. « Studie av mätosäkerhet hos punktmoln skapade med Matterport Pro2 3D-kamera vid IR-skanning i olika ljusförhållanden ». Thesis, Högskolan i Gävle, Samhällsbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-34530.
Texte intégralDue to the technological development within 3D-scanning the last decade usage of pointcloud data has increased significantly. To generate these pointclouds a plethora of methods and instrument are used. Among other photogrammetry, terrestrial laser scanning and mobile laser scanning are commonly used. With the newer mobile scanning systems a SLAM algorithm is usually used for the scanner to correctly scan the surroundings while being moved at the same time. To achieve this a IMU is usually used for positioning or cameras using triangulation. With new algorithms and equipment scanning systems keeps improving. This leads to more and more systems being developed, usually for a specific area of usage. Matterport Pro2 3D-camera which was tested in this project is such a system developed mainly for visualising and creating 3D-models of housing through scanning, RGB-D and 360°-images. These models generated are pointclouds aswell as meshmodels. In this project the effect of different illuminance has on the results when creating 3D-models with the Pro2 camera is tested. Measured distances between targets placed around the testing room were used for checking the point clouds for errors. In total five scans were performed at different illuminance varying from 1 – 800 lux. Deviations between measured distances and point cloud distances were compared to determine which point cloud deviated the least. Results show that an illuminance of about 30 - 60 lux gave the best result. Any significant differences between the other light conditions could not be determined. Furthermore, the results imply there is a systematic error which is not completely unexpected and has been shown in a previous study with the same camera. This means the camera needs a calibration before being used to scan where higher accuracy is needed.
Gianto, Gianto. « Multi-dimensional Teager-Kaiser signal processing for improved characterization using white light interferometry ». Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD026/document.
Texte intégralThe use of white light interference fringes as an optical probe in microscopy is of growing importance in materials characterization, surface metrology and medical imaging. Coherence Scanning Interferometry (CSI, also known as White Light Scanning Interferometry, WSLI) is well known for surface roughness and topology measurement [1]. Full-Field Optical Coherence Tomography (FF-OCT) is the version used for the tomographic analysis of complex transparent layers. Both techniques generally make use of some sort of fringe scanning along the optical axis and the acquisition of a stack of xyz images. Image processing is then used to identify the fringe envelopes along z at each pixel in order to measure the positions of either a single surface or of multiple scattering objects within a layer.In CSI, the measurement of surface shape generally requires peak or phase extraction of the mono dimensional fringe signal. Most of the methods are based on an AM-FM signal model, which represents the variation in light intensity measured along the optical axis of an interference microscope [2]. We have demonstrated earlier [3, 4] the ability of 2D approaches to compete with some classical methods used in the field of interferometry, in terms of robustness and computing time. In addition, whereas most methods only take into account the 1D data, it would seem advantageous to take into account the spatial neighborhood using multidimensional approaches (2D, 3D, 4D), including the time parameter in order to improve the measurements.The purpose of this PhD project is to develop new n-D approaches that are suitable for improved characterization of more complex surfaces and transparent layers. In addition, we will enrich the field of study by means of heterogeneous image processing from multiple sensor sources (heterogeneous data fusion). Applications considered will be in the fields of materials metrology, biomaterials and medical imaging
Hannachi, Ammar. « Imagerie multimodale et planification interactive pour la reconstruction 3D et la métrologie dimensionnelle ». Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD024/document.
Texte intégralProducing industrially manufactured parts generates a very large number of data of various types defining the manufacturing geometries as well as the quality of production. This PhD work has been carried out within the framework of the realization of a cognitive vision system dedicated to the 3D evaluation of manufactured objects including possibly free form surfaces, taking into account the geometric tolerances and uncertainties. This system allows the comprehensive control of manufactured parts, and provides the means for their automated 3D dimensional inspection. The implementation of a multi-sensor (passive and active) measuring system enabled to improve significantly the assessment quality through an enriched three-dimensional reconstruction of the object to be evaluated. Specifically, we made use simultaneously of a stereoscopic vision system and of a structured light based system in order to reconstruct the edges and surfaces of various 3D objects
Harati, Ebrahim. « Fatigue strength of welds in 800 MPa yield strength steels : Effects of weld toe geometry and residual stress ». Licentiate thesis, Högskolan Väst, Avd för tillverkningsprocesser, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8009.
Texte intégralVecchione, Rossella. « High-resolution 3D geomatic techniques to assess hazardous spills impacts on road surface performances ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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