Dissertations / Theses: 'Optics in industrial inspection'

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Sharma, Harish Chander. "Recognition and representation of contours in the measurement of spheric and aspheric surfaces." Thesis, De Montfort University, 1986. http://hdl.handle.net/2086/4120.

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Wieler, Matthias [Verfasser], and Fred A. [Akademischer Betreuer] Hamprecht. "Multiple Instance Learning with Random Forests and Applications in Industrial Optical Inspection / Matthias Wieler ; Betreuer: Fred A. Hamprecht." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/1180032144/34.

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Search, David John. "Inspection of periodic structures using coherent optics." Thesis, Liverpool John Moores University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242378.

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Hardman, Gavin. "Bayesian inspection planning for large industrial systems." Thesis, Durham University, 2007. http://etheses.dur.ac.uk/1998/.

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The implementation of consistent and repeatable methods for inspection planning is a problem faced by a wide range of industries. The theory of Bayesian design problems provides a well established method for the treatment of inspection planning problems, but is often difficult to implement for large systems due to its associated computational burden. We develop a tractable Bayesian method for inspection planning. The use of Bayes linear methods in the place of traditional Bayesian techniques allows us to assess properties of proposed inspection designs with greater computational efficiency. This improvement in efficiency allows a greater range of designs to be assessed and the design space to be searched more effectively. We propose a utility based criterion for the identification of designs that offer improved prediction for future system properties. Designs with good typical performance are identified through utility maximisation. The viability of the method is demonstrated by application to an example based on data from a real industrial system.

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Fountain, A. M. "Real-time image processing for industrial inspection." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356523.

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Field, Matthew. "Machine vision system developments for industrial inspection applications." Thesis, University of Central Lancashire, 1997. http://clok.uclan.ac.uk/20334/.

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This thesis describes research in the area of automated industrial inspection using machine vision systems. It is anticipated that the algorithms described will contribute to the design of a machine vision system for the automatic surface inspection of cylindrical pellets. Firstly, the acquisition and segmentation of pellet tray images using area capture is described. Individual pellets are segmented from a pellet tray image by a novel system using the Radon transform coupled with data clustering. Subsequent to the segmentation, the linking of four pellet views depicting the entire circumferential area of the pellet is described along with a simple technique to compensate for intensity variations brought about by imaging the three-dimensional cylindrical surface of the pellet. The image processing techniques of filtering, edge detection, thresholding and morphology are used in the segmentation of grey level pellet defect images. The grey level pellet images are low-pass filtered and binary images formed using edge detection with thresholding. Binary morphology operators are then used in conjunction with a termination condition based on the number of objects in the image to ensure homogenous defect representations. The problem of overlapping defects is addressed, resulting in a second algorithm using the Radon transform coupled with data clustering. Prior to classification salient features are extracted from a set of synthetic binary defect images to form feature vectors. The novel idea of image object classification using 100% fuzzy inference is described, and results are shown to be superior to results obtained by feature space classifiers. The sub-classification of crack defects is carried out using a heuristic classifier, and the parameterisation of pellet defects is described.

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White, Richard Mark. "Automated industrial measurement and inspection using image processing." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317271.

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Leung, Tin Wah William. "High precision camera-based colour inspection of industrial products." Thesis, University of Huddersfield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338605.

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Wilson, Duncan John. "Classification of defects using uncertainty in industrial web inspection." Thesis, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286894.

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Souza, Iuri Santos. "Understanding software product lines inspection in an industrial setting." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/2623.

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Made available in DSpace on 2014-06-12T15:59:44Z (GMT). No. of bitstreams: 2 arquivo5530_1.pdf: 3005185 bytes, checksum: 2a022c6abeac87f561b30607dd251420 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2011
Faculdade de Amparo à Ciência e Tecnologia do Estado de Pernambuco
Reuso de software é um aspecto fundamental para as organizações de software interessadas em melhorar os custos, a qualidade e reduzir o tempo de entrega dos produtos. Engenharia de Linhas de Produtos de software (SPL) é um conceito crescente em engenharia de software e foi desenvolvido objetivando uma maneira sistemática e prescrita para alcançar reuso. SPL é uma estratégia de reuso pró-ativa, que explora semelhanças e gerencia variabilidades dentro de um conjunto de produtos. O inerente reuso de artefatos de software em combinação com o desenvolvimento usualmente iterativo, traz um conjunto de melhorias para o desenvolvimento de software no contexto de SPL. Além disso, o conjunto de benefícios de SPL não acontecem sem esforços, tem alguns desafios e requer abordagens de garantia de qualidade, como testes e inspeção. Se esses pontos não são considerados, o sucesso da linha pode não ser alcançado, contrariando os enormes benefícios econômicos. Embora alguns autores discutam a importância de inspeções de software em todo o desenvolvimento de engenharia de software, na prática, poucos estudos discutem a relação entre inspeção e artefatos das fases iniciais de SPL. O cenário de Qualidade em SPL tem uma carência substancial da literatura em discutir as técnicas de garantia de qualidade. Neste cenário, esta dissertação apresenta um conjunto de evidências empíricas sobre Inspeção em Linhas de Produtos de Software fornecidas por um estudo empírico embutido, realizado em um ambiente industrial com objetivo de compreender e caracterizar como a atividade de inspeção deve ser tratada nas fases iniciais de SPL (escopo e engenharia de requisitos), especialmente para os artefatos de especificação de features, requisitos funcionais e casos de uso. Além disso, com base nos resultados coletados no estudo empírico alguns modelos de predição foram construídos a fim de estimar o número de não-conformidades para os artefatos investigados neste trabalho

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Wallace, Ian Gerard Patrick. "An intermediate level industrial vision system." Thesis, Kingston University, 1991. http://eprints.kingston.ac.uk/20558/.

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There is a trend in manufacturing towards fully automated production facilities in which all operations are integrated by computer based information systems. The current generation of industrial inspection systems lack the necessary flexibility to operate in these environments. AI based Image Understanding systems have the necessary level of generality, achieved through the use of domain specific object models. These models are used to guide early visual processing, and must be supplied to the system. Current theories in cognitive psychology call for a reevaluation of the role of such 'auxiliary' knowledge in early visual processing. Recent work suggests that very general cognitive processes may build up a hierarchical representation of the world. The emphasis is currently on such generic cognitive processes rather than on the use of world knowledge. A novel approach to image processing, in which emphasis is placed on generic low and intermediate level techniques, is proposed in this thesis. This approach, termed the descriptor approach, delays the use of domain specific models until a full description of the image has been produced. A prototype industrial inspection system has been implemented, based on the descriptor approach: the Hierarchical Scene Description (HISD) system. General image features are extracted from images of populated PCBs, and subsequently transformed into a database of prolog facts by an interface subsystem. Finally the intermediate level vision subsystem uses rules to reason about these features, building up a semantic net based description of the scene. HISD successfully builds up hierarchical descriptions of real industrial PCB images in terms of geometric shapes, their coordinates, and spatial relationships between shapes. The results are displayed graphically and are achieved without the use of any object models, thus avoiding the problems of inflexibility and lack of generality associated with more complex model based systems.

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Carrera, Radic Patricio, and Oyarzún Juan Muñoz. "Empresa Plant Inspection & Improvement SpA." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/167872.

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TESIS PARA OPTAR AL GRADO DE MAGÍSTER EN ADMINISTRACIÓN
Carrera Radic, Patricio, [Parte I], Muñoz Oyarzún, Juan, [Parte II]
Todas las compañías de la gran minería del cobre cuentan con plantas de conminución1 seca (Chancado primario, secundario, terciario) que son generadoras de polvo y derrames de mineral que, en caso de no ser controlados, provocan discontinuidades operacionales y pérdidas de producción. Se correlacionan condición de aseo y disponibilidad de la planta. La necesidad de controlar el polvo acumulado y los derrames y una política transversal dirigida a concentrar su capital humano propio en actividades y funciones asociadas a su core bussines, conducen a que las compañías contraten servicios externos para la realización del aseo industrial en tales plantas. En estos contratos siempre existen brechas entre lo contratado y lo recibido, es decir, la calidad o los esfuerzos realizados por el prestador de servicio distan de lo contratado o esperado por el cliente o mandante, con dificultades para cuantificar la correlación servicio de aseo con la disponibilidad de la planta. Plant Inspection & Improvement SpA (PI&I SpA) responde a un modelo de negocios consistente en un servicio de inspecciones técnicas enfocado en mejorar la productividad de plantas de chancado, a través del incremento de la disponibilidad de sus equipos y sistemas productivos, mediante la maximización del rendimiento de sus contratos de aseo industrial. Inspecciones técnicas con la perspectiva de una extensa experiencia en plantas de chancado y contratos de aseo industrial sumado a un modelo de gestión maduro y sustentado en una plataforma robusta de tecnologías de información otorgarán al cliente un control completo de su planta en cuanto a aseo industrial. Es un servicio diferenciado, no disponible en el mercado, sin competidores directos y vinculados a una industria minera creciente, que debe encontrar disposición a pagar por parte del cliente. Comenzando por las regiones de Tarapacá y Antofagasta se espera lograr al menos 6 contratos en 5 años. Con una tarifa mensual que es función del tamaño de planta y de la envergadura del contrato a inspeccionar. Financieramente, los indicadores claves del proyecto son: Indicador Valor VAN $ 176.053.103 TIR 33.6% PayBack 4.12 años TD 16,9% Tabla N°1: Indicadores Financieros Proyecto. En síntesis, una iniciativa que genera una nueva necesidad en un mercado importante, con buenos indicadores financieros y de riesgo, lo convierten en un proyecto potencialmente exitoso y atractivo.

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Derrington, Dolores Cormack. "Overview of fiber optics technology: industrial and military." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43896.

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Fiber optics technology is being used in many applications, both in the military world and in the industrial world. A broad overview of this technology is provided, including a discussion of the fundamentals of fiber operation and component characteristics. Applications of fiber optics in both military and industrial communities is addressed, identifying specific examples in both cases. In addition, market projections and technology trends are discussed for both the military and industrial communities.
Master of Science

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Rebello, Ranjit Thomas. "Location of inspection stations on flow networks." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185969.

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This dissertation deals with the problem of locating inspection stations in two different scenarios: (1) in a manufacturing environment, and (2) in a network involving the transportation of hazardous materials. In the manufacturing environment problem, the location of specialized inspection stations in a serial system and in a serial-parallel system is considered. These location problems have the special characteristic that the demand for the facilities being located is from prespecified link flows and their properties. When defects are introduced in a serial manufacturing system, objectives such as minimization of total cost, maximization of yield, and minimization of undetected faulty units are all viable optimization criteria. The dissertation develops several new models for locating specialized inspection stations using such objectives. Cases considered include (1) when inspection/rework stations are to be located, (2) when inspection stations are already located but their operating modes (rework or scrap) are to be determined, and (3) when both locations and operating modes are to be determined. Exact and/or heuristic methods of solutions for these models are developed and some computational experience is reported. Serial lines have the disadvantage that the product flow is easily disrupted by a single machine malfunction anywhere on the line. One way of improving system performance is to provide some degree of redundancy at the machine level using serial-parallel systems. Extensions of some of the serial-system results to the serial-parallel systems are also presented. In the hazardous material transportation setting, the regulating agencies problem of making decisions on where to inspect trucks on the underlying transportation network is considered. In the case when each inspection station's capacity is limited, the problem can be formulated as a new capacitated facility location problem. Some heuristics and an exact branch-and-bound procedure to solve this problem are developed and some computational experience is reported.

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Bilge, Burak. "Rrt Based Kinodynamic Motion Planning For Multiple Camera Industrial Inspection." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610543/index.pdf.

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Kinodynamic motion planning is an important problem in robotics. It consists of planning the dynamic motion of a robotic system taking into account its kinematic and dynamic constraints. For this class of problems, high dimensionality is a major difficulty and finding an exact time optimal robot motion trajectory is proven to be NP-hard. Probabilistic approximate techniques have therefore been proposed in the literature to solve particular problem instances. These methods include Randomized Potential Field Planners (RPP), Probabilistic Roadmaps (PRM) and Rapidly Exploring Random Trees (RRT). When physical obstacles and differential constraints are added to the problem, applying RPPs or PRMs encounter difficulties. In order to handle these difficulties, RRTs have been proposed. In this study, we consider a multiple camera industrial inspection problem where the concurrent motion of these cameras needs to be planned. The cameras are required to capture maximum number of defect locations while globally avoiding collisions with each other and with obstacles. Our approach is to consider a solution to the kinodynamic planning problem of multiple camera inspection by making use of the RRT algorithm. We explore and resolve issues arising when RRTs are applied to this specific problem class. Along these lines, we consider the cases of a single camera without obstacles and then with obstacles. Then, we attempt to extend the study to the case of multiple camera where we also need to avoid collisions between cameras. We present simulation results to show the performance of our RRT based approach to different instrument configurations and compare with existing deterministic approaches.

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Cao, X. "Hough transform techniques for recognition and inspection of industrial objects." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636204.

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It is well known that the lack of robustness, reliability and fast processing of computer vision algorithms is a major barrier affecting the wide use of machine vision systems in industrial automation. To this end, the thesis evaluates many Hough transform related techniques and proposes several efficient algorithms suitable for object identification and inspection in industrial scenes. To detect multiple circular objects in a noisy image accurately, two schemes are proposed. The first scheme combines a labelling technique with the adaptive Hough transform for circle detection to resolve the ambiguities in locating peaks in the parameter space. In the second scheme an alternative transform equation is used to generate the parameter space and, for locating a cluster of three points on a circle, a set of rules is developed. Using this approach, the parameter space generated by the transform is more compact that that generated using conventional methods, and hence fast processing can be achieved. To validate the proposed approaches, several experiments are conducted to detect multiple circular objects in both synthetic and real images. The experiments show that the labelling adaptive Hough transform can produce good results when used to detect circular objects in good-contrast images, and the algorithm using an alternative transform equation performs very well, even in images contaminated by noise, with objects touching and/or overlapping each other. An improved technique is also presented for the detection of arbitrarily-shaped objects by incorporating a model-size-reduction scheme into an optimized, generalized Hough transform. For further speed-up of the algorithms developed in the thesis, their parallel implementation on transputer-based networks is investigated.

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Hou, Yoshen. "Developing a flexible range sensing system for industrial inspection applications." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07102009-040351/.

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Barker, Simon Peter. "Studies of algorithms and related imaging techniques for industrial inspection." Thesis, Royal Holloway, University of London, 1989. http://repository.royalholloway.ac.uk/items/4b611e51-6696-401f-9a87-72b8b7d1826f/1/.

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This thesis will deal with algorithms and imaging techniques for use in automated industrial inspection. The work falls into two main areas, the first dealing with general problems relating to typical inspection tasks, the second with specific applications including the analysis of seals on plastic packets. The requirements of a general object location and inspection system will be discussed initially in relation to algorithms supplied with commercial systems, which often seem ad-hoc. This will be followed up with detailed analyses of several corner and small hole detection algorithms. The features looked for in a useful algorithm are: (1) a high execution speed when implemented on a general purpose microcomputer, (2) good accuracy in locating the desired features, (3) robustness when faced with poor quality, noisy or cluttered images and (4) the ability to distinguish between genuine features and others that appear, superficially, to be similar. A program using these feature detectors to locate partially occluded machine parts in typical images will be presented. The second main area of investigation is that of the detection of faults in heat sealed food packets and is one which has hitherto largely been overlooked. The main problem with these packets is that the cellophane wrapper is highly reflective, giving rise to large areas of glare in any off-camera image. Experience has shown that careful lighting arrangement alone will never totally remove this problem. However, a simple arrangement of switched light beams, along with computer processing, can almost totally eliminate the glare. This approach has been used in the inspection of packets where faults are revealed by parts of the product inside showing through holes in the wrapper. Alternatively, by careful alignment of the light sources, the surface structure of the sealed part of a packet may be revealed. This can reveal defects either through the absence of a regular pattern, or by the presence of wrinkles running across the seal. Algorithms have been developed demonstrating each of these inspection tasks. Overall the work presented in this thesis has spanned several traditional areas of interest, and has also developed the techniques required for packet inspection and other situations where glare is a problem.

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Telford, D. W. "Ultrasonic inspection techniques for testing sodium/water heat exchangers using Lamb waves." Thesis, University of the West of Scotland, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372392.

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Cho, Tai-Hoon. "A knowledge-based machine vision system for automated industrial web inspection." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134615/.

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Jubb, Matthew James. "Optimal use of computing equipment in an automated industrial inspection context." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/4882/.

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This thesis deals with automatic defect detection. The objective was to develop the techniques required by a small manufacturing business to make cost-efficient use of inspection technology. In our work on inspection techniques we discuss image acquisition and the choice between custom and general-purpose processing hardware. We examine the classes of general-purpose computer available and study popular operating systems in detail. We highlight the advantages of a hybrid system interconnected via a local area network and develop a sophisticated suite of image-processing software based on it. We quantitatively study the performance of elements of the TCP/IP networking protocol suite and comment on appropriate protocol selection for parallel distributed applications. We implement our own distributed application based on these findings. In our work on inspection algorithms we investigate the potential uses of iterated function series and Fourier transform operators when preprocessing images of defects in aluminium plate acquired using a linescan camera. We employ a multi-layer perceptron neural network trained by backpropagation as a classifier. We examine the effect on the training process of the number of nodes in the hidden layer and the ability of the network to identify faults in images of aluminium plate. We investigate techniques for introducing positional independence into the network's behaviour. We analyse the pattern of weights induced in the network after training in order to gain insight into the logic of its internal representation. We conclude that the backpropagation training process is sufficiently computationally intensive so as to present a real barrier to further development in practical neural network techniques and seek ways to achieve a speed-up. Weconsider the training process as a search problem and arrive at a process involving multiple, parallel search "vectors" and aspects of genetic algorithms. We implement the system as the mentioned distributed application and comment on its performance.

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Dearden, Geoffrey. "An industrial free electron laser." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240478.

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Coxon, W. D. "Evaluation of models for decision making in inspection and repair maintenance." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/21151.

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There has been growth in the costs of maintenance over the last 40 years. This can be linked directly to the changes in production technology over that period of time. However. there has also been growth in the field of management science and operations research. Many models have been developed to assist the maintenance function in its decisions. However. it would appear from engineering journals and shop floor practice that these models are not well used. For this research the method of inspection and repair maintenance has been chosen. Mainly because it is one of the most widely used methods. The objectives of the research are as follows: (1) To investigate the state of the art of plant and equipment maintenance paying particular attention to the inspection and repair policy. (2) To establish what basic models are available for decision making in inspection and repair maintenance. (3) To establish how feasible and useful each of these models is in the practical engineering environment. (4) To consider factors in the implementation of a decision making model in the inspection and repair policy with particular reference to the most practical and feasible model investigated.

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Cristino, Filipe. "Investigation into a real time 3D visual inspection system for industrial use." Thesis, Liverpool John Moores University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402879.

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Ward, P. T. "Visual inspection, its automation and application in the textile industry." Thesis, De Montfort University, 1986. http://hdl.handle.net/2086/10675.

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Yang, Christopher Chuan-Chi 1968. "Active vision inspection: Planning, error analysis, and tolerance design." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282424.

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Inspection is a process used to determine whether a component deviates from a given set of specifications. In industry, we usually use a coordinate measuring machine (CMM) to inspect CAD-based models, but inspection using vision sensors has recently drawn more attention because of advances that have been made in computer and imaging technologies. In this dissertation, we introduce active vision inspection for CAD-based three-dimensional models. We divide the dissertation into three major components: (i) planning, (ii) error analysis, and (iii) tolerance design. In inspection planning, the inputs are boundary representation (object centered representation) and an aspect graph (viewer centered representation) of the inspected component; the output is a sensor arrangement for dimensioning a set of topologic entities. In planning, we first use geometric reasoning and object oriented representation to determine a set of topologic entities (measurable entities) to be dimensioned based on the manufactured features on the component (such as slot, pocket, hole etc.) and their spatial relationships. Using the aspect graph, we obtain a set of possible sensor settings and determine an optimized set of sensor settings (sensor arrangement) for dimensioning the measurable entities. Since quantization errors and displacement errors are inherent in an active vision system, we analyze and model the density functions of these errors based on their characteristics and use them to determine the accuracy of inspection for a given sensor setting. In addition, we utilize hierarchical interval constraint networks for tolerance design. We redefine network satisfaction and constraint consistency for the application in tolerance design and develop new forward and backward propagation techniques for tolerance analysis and tolerance synthesis, respectively.

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Trujillo, San Martin Maite. "A general textural classification framework : non-destructive industrial inspection and remote sensing applications." Thesis, Brunel University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483536.

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Mayhew, Stephen. "Robust control of an industrial free electron laser." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318250.

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Shaw, Andrew. "The realisation of an Industrial Free Electron Laser." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284265.

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Kim, Do Hyung. "On the removal of material for polishing aspheric optics." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343732.

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Bonnín, Pascual Francisco. "Contributions to Robot-based Vessel Visual Inspection." Doctoral thesis, Universitat de les Illes Balears, 2017. http://hdl.handle.net/10803/543844.

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[cat]El transport marítim és una de les maneres més efectives de transportar béns d’un lloc a l’altre del món. Encara que avui dia es realitzen grans esforços per tal d’evitar els accidents marítims, aquests encara ocorren i, de tant en tant, tenen conseqüències catastròfiques en termes ambientals, humans i/o econòmics. Els problemes estructurals causats per esquerdes i/o corrosió són la causa principal d’aquests accidents i, per això, els vaixells són sotmesos a ins-peccions periòdiques amb l’objectiu de garantir la seva integritat estructural. Per dur a terme una inspecció, els vaixells són buidats i portats a una drassana on s’instal·len bastides que permeten als inspectors arribar a les zones més altes de la seva estructura. Aquestes inspeccions es realitzen sovint en compartiments perillosos o de difícil accés. En termes econòmics, el procés pot suposar un desemborsament de fins a un milió de dòlars. Per tot això, qualsevol contribució que suposi una reducció en el temps/cost de la inspecció, o un increment en la seguretat dels operaris, està justificada. En aquesta tesi es proposen noves eines tecnològiques que pretenen contribuir al redisseny dels processos d’inspecció visual de vaixells. D’una banda, es proposa una nova plataforma robòtica aèria que permet a l’operari realitzar la ins-pecció del vaixell des d’una posició segura i còmoda. Aquesta plataforma consisteix en un dispositiu de fàcil ús que ha estat desenvolupat seguint el paradigma de l’Autonomia Supervisada, de tal manera que el vehicle s’encarrega de totes les tasques referents a la seguretat, mentre que l’operari proporciona les consignes de desplaçament i pot centrarse en el procés d’inspecció. D’altra banda, es proposen diversos algorismes basats en visió per a la detecció de defectes en l’estructura del vaixell. En primer lloc, es proposen diversos mètodes per a la detecció de corrosió, basats en la combinació de diferents descriptors de color i de textura. En segon lloc, es proposa un algorisme per a la detecció d’esquerdes que combina l’extracció de contorns amb un procés de creixement de regions. Finalment, s’avalua el concepte de notorietat per a la detecció de defectes genèrics, i per a la millora del rendiment dels detectors de corrosió i d’esquerdes. La plataforma robòtica i els detectors de defectes proposats han estat avaluats tant en laboratori com durant proves de camp realitzades a bord d’un vaixell real. Els resultats obtinguts permeten confirmar la utilitat i el bon rendiment de les diferents eines tecnològiques propostes.
[spa]El transporte marítimo es una de las maneras más efectivas de transportar mercancías de un lugar a otro del mundo. Aunque hoy en día se llevan a cabo muchos esfuerzos para evitar los accidentes marítimos, estos todavía ocurren y, de vez en cuando, tienen consecuencias catastróficas en términos ambientales, humanos y/o económicos. Los daños estructurales causados por grietas y/o corrosión son la causa principal de estos accidentes y, por ello, los barcos son sometidos a inspecciones periódicas con el objetivo de garantizar su integridad estructural. Para llevar a cabo una inspección, los barcos son vaciados y llevados a un astillero donde se instalan andamiajes para permitir a los inspectores alcanzar las zonas más altas de su estructura. Estas inspecciones se realizan muchas veces en entornos peligrosos o de difícil acceso. En términos económicos, el proceso puede suponer un desembolso de hasta un millón de dolares. Por todo ello, cualquier contribución que suponga una reducción en el tiempo/coste de la inspección, o un incremento en la seguridad de los operarios, está justificada. En esta tesis se proponen nuevas herramientas tecnológicas que pretenden contribuir al rediseño de los procesos de inspección visual de barcos. Por un lado, se propone una nueva plataforma robótica aérea que permite al operario realizar la inspección del barco desde una posición segura y cómoda. Esta plataforma consiste en un dispositivo de fácil manejo que ha sido desarrollado siguiendo el paradigma de la Autonomía Supervisada, de tal manera que el vehículo se encarga de todas las tareas referentes a la seguridad, mientras que el operario proporciona las consignas de desplazamiento y puede centrarse en el proceso de inspección. Por otro lado, se proponen diversos algoritmos basados en visión para la detección de defectos en la estructura del barco. En primer lugar, se proponen varios métodos para la detección de corrosión, basados en la combinación de diferentes descriptores de color y de textura. En segundo lugar, se propone un algoritmo para la detección de grietas que combina la extracción de contornos con un proceso de crecimiento de regiones. Finalmente, se evalúa el concepto de notoriedad para la detección de defectos genéricos, y para la mejora del rendimiento de los detectores de corrosión y de grietas. La plataforma robótica y los detectores de defectos propuestos han sido evaluados tanto en laboratorio como durante pruebas de campo realizadas a bordo de un barco real. Los resultados obtenidos permiten confirmar la utilidad y el buen rendimiento de las diferentes herramientas tecnológicas propuestas.
[eng]Vessels are nowadays one of the most cost effective ways to transport goods around the world. Despite the efforts to avoid maritime accidents, these still occur and, from time to time, have catastrophic consequences in environmental, human and/or economic terms. Structural failures caused by cracks and/or corrosion are the main cause of these accidents and, as such, vessels are submitted to periodical inspections in order to ensure their structural integrity. To carry out this task, vessels have to be emptied and situated in a dockyard where high scaffoldings are installed to allow the human inspectors to reach the highest parts of the vessel structure. Besides, the surveys are on many occasions performed in hazardous environments with difficult access. In economic terms, total expenses can reach up to one million dollars. Therefore, it is clear that any level of automation of the inspection process that can lead to a reduction of the inspection time, a reduction of the financial costs and/or an increase in the safety of the operation is fully justified. In this regard, this dissertation presents novel technological tools to contribute to re-engineering the process of vessel visual inspection. On the one hand, a novel aerial robotic platform is proposed to allow the surveyor to perform a proper inspection from a safe and comfortable position. It consists in an easy-to-use device which has been developed around the Supervised Autonomy paradigm, so that the vehicle is in charge of all the safety-related issues, while the surveyor provides the displacement commands and focuses on the inspection process. On the other hand, novel vision-based algorithms for defect detection on vessels structures are proposed. Firstly, several corrosion detection methods are described, based on the combination of different colour and texture descriptors. Secondly, a crack detection method, which combines edge detection with a region growing procedure, is proposed. Finally, the idea of saliency for detecting generic defects on vessel structures is evaluated, and also to improve the performance of the corrosion and crack detectors. The aerial platform and the defect detectors are evaluated both under laboratory conditions and during field tests performed on board real vessels. The results obtained allow to confirm the usability and the good performance of all the proposed technological tools.

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Chen, Howard. "Design of a controlled environment agricultural plant inspection robot." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/2838.

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Without an increase in cropland, agricultural efficiency must be tripled in the next 50 years to sustain the increased demand for food. Controlled environment agriculture (CEA) systems are likely to play an important role in the increase of agricultural efficiency. CEA systems, however, require constant observation because decisions must be quickly made when plants show signs of stress. A visual inspection system that uses a robotic camera system would permit visual access to inaccessible plants in a large hydroponics operation or allows an observer to remotely inspect plants for multiple small or remote CEA operations, whereas a dedicated CEA specialist would be beneficial but impractical under present conditions. This thesis presents a theoretical design for a plant inspection robot. The design parameters, design process, and the system specification necessary to satisfy the design constraints were examined for this system. The design analysis revealed that the major components of the plant inspection robot must be designed sequentially, starting with the imaging system. The imaging system design revealed that the system parameters were governed by illumination, shape and size of the object, and the desired detail. The motion system design was governed by velocity, acceleration, work area, and accuracy. An example design for a system used for visual inspection of 289 romaine lettuce plants was presented. This design was shown to be feasible from the theoretical perspective and could be built from commercially-available components, reducing development time and cost.

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Zhang, Zhengwen. "Self-learning systems and neural networks for image texture analysis." Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296217.

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Umasuthan, M. "Recognition and position estimation of 3D objects from range images using algebraic and moment invariants." Thesis, Heriot-Watt University, 1995. http://hdl.handle.net/10399/763.

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Littell, William Neil. "Physiological effects of monocular display augmented, articulated arm-based laser digitizing." Thesis, Mississippi State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3558911.

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The process of capturing solid geometry as 3 dimensional data requires the use of laser based reverse engineering hardware, known as a digitizer. Many digitizers exist as articulated coordinate measuring machines augmented with a laser, which forces the operator into many postures that are not ergonomically sound, particularly in the operator's upper body. This study analyzes the traditional method of laser digitizing using modern methods and technologies. An alternative user interface using an occluded head-mounted monocular display is hypothesized and evaluated.

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Maheshwari, Nitin. "On the Selection of CMM Based Inspection Methodology for Circularity Tolerance." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin988220697.

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37

Li, Likai. "Design, Fabrication and Metrology of Precision Molded Freeform Plastic Optics." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1412162892.

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Leal, James Andrew 1963. "Automated radiographic inspection of through-hole electronic circuit board solder defects." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276672.

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A study has been carried out to investigate the use of "real-time" radiography as a method of automated inspection of through-hole electronic circuit board solder joints. By evaluating five major solder defects it has been found that film radiography employing high contrast film results in a definite distinction between a good solder joint and a defective solder joint. The same five defects were also found to be distinguishable from a good solder joint when evaluated by a real-time radiographic inspection unit using digital image processing. Although the type of defect being investigated was not discernible, the ability to distinguish a good solder joint from a defective solder joint is a major step in the implementation of automated solder joint inspection for military electronics.

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Ramaswami, Hemant. "An integrated framework for virtual machining and inspection of turned parts." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282574694.

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Zhu, Dongping. "A feasibility study on using CT image analysis for hardwood log inspection." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-164753/.

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TAMBE, SOURABH M. "INCORPORATING GEOMETRIC TOLERANCE INFORMATION IN SOLID MODELS TO BUILD AUTOMATED INSPECTION SYSTEMS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092924245.

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Maples, Allen B. "Design of a robust acoustic positioning system for an underwater nuclear reactor vessel inspection robot." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06232009-063217/.

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Fen, Yun-Jr. "The design of a microcomputer based true basic statistical process control package for inspection by variables." Ohio University / OhioLINK, 1989. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1182435780.

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Nilsson, Jim, and Peter Valtersson. "Machine Vision Inspection of the Lapping Process in the Production of Mass Impregnated High Voltage Cables." Thesis, Blekinge Tekniska Högskola, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16707.

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Background. Mass impregnated high voltage cables are used in, for example, submarine electric power transmission. One of the production steps of such cables is the lapping process in which several hundred layers of special purpose paper are wrapped around the conductor of the cable. It is important for the mechanical and electrical properties of the finished cable that the paper is applied correctly, however there currently exists no reliable way of continuously ensuring that the paper is applied correctly. Objective. The objective of this thesis is to develop a prototype of a cost-effective machine vision system which monitors the lapping process and detects and records any errors that may occur during the process; with an accuracy of at least one tenth of a millimetre. Methods. The requirements of the system are specified and suitable hardware is identified. Using a method where the images are projected down to one axis as well as other signal processing methods, the errors are measured. Experiments are performed where the accuracy and performance of the system is tested in a controlled environment. Results. The results show that the system is able to detect and measure errors accurately down to one tenth of a millimetre while operating at a frame rate of 40 frames per second. The hardware cost of the system is less than €200. Conclusions. A cost-effective machine vision system capable of performing measurements accurate down to one tenth of a millimetre can be implemented using the inexpensive Raspberry Pi 3 and Raspberry Pi Camera Module V2. Th

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Gupta, Sunil 1966. "Intersymbol interference characterization and equalization for high density optical data storage." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278217.

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In optical data storage, intersymbol interference (ISI) is one of the limiting factors for high storage density. To reduce ISI, we need to understand its characteristics and use appropriate signal processing techniques. In this thesis, we characterize ISI for various data patterns and compare Signal to Noise Ratio (SNR) with and without ISI equalization. To characterize ISI, we sample the readback waveforms and use a computer program for data processing. To compare SNR with and without equalization, we record a pseudo random sequence and compare the detected marks with original marks. We also compute SNR using the additive interleaving detection (AID) technique without ISI equalization. From our studies, ISI is found to be more significant as mark widths become smaller. We also found that SNR can be increased by 3-9 db with equalization. More interestingly, we found that AID gives good SNR even without ISI equalization. This indicates the simplicity of using AID for higher storage density.

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Pebody, Miles. "Autonomy in the real real-world : a behaviour based view of autonomous systems control in an industrial product inspection system." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266321.

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Hooks, Kevin. "Enhancing quality inspection through the integration of quality control and computer aided design a framework." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1177100770.

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Silva, Rodrigo Juliano. "Desenvolvimento de um sistema automatizado e dedicado à medição de diâmetros internos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-26042012-093945/.

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Determinadas peças cilíndricas internas exigem inspeção via súbito por dificuldades inerentes à peça ou de acesso a essas dimensões. O trabalho com esse tipo de instrumento exige operador especializado e em geral são medições demoradas e com alto nível de incerteza potencializada quando se trata de produção de médios e grandes lotes. Sabe-se que a medição acurada com baixos níveis de incerteza associada a tempos econômicos de inspeção são decisivos para o aumento da qualidade e produtividade da empresa, já que o conhecimento das dimensões é essencial para assegurar, que os componentes produzidos através dos diversos processos de manufatura estejam dentro das especificações. Este trabalho tem por objetivo apresentar o desenvolvimento de um sistema automatizado para a medição de diâmetros internos que simule a medição via comparador de diâmetros. Um robô industrial foi empregado como manipulador de transdutores de deslocamento do tipo LVDT e, substitui o operador humano. Para a realização das medidas, foi desenvolvido um programa computacional em linguagem Delphi, o que proporcionou a comunicação entre o microcomputador, LVDT e o sistema de controle do robô através de uma placa de aquisição do tipo AD/DA. Os valores medidos foram comparados com padrões metrológicos pertinentes. Os resultados foram efetivos e comprovaram a eficácia do sistema de medição proposto tanto técnica como economicamente.
Certain internal cylindrical surfaces require diameter inspection by means of bore gauges due to either shape-inherent difficulties or poor access to the measuring point. Measurements with such instruments, which call for skilled operator, are generally long and may present high uncertainty levels when inspecting mid-size or large part batches. Accurate measurements with low associated uncertainty and cost-effective inspection time are decisive to quality and productivity improvement, since dimensional information is essential to ensure that parts produced by several manufacturing processes lie within specifications. This work aims to present the development of an automated and dedicated diameter measuring system that simulates bore gauge inspection. An industrial robot, which was employed to manipulate inductive type displacement probes, replaces the human operator. In order to achieve measurements, a Delphi language object-oriented algorithm was developed to provide communication among displacement probes, a microcomputer and the robot control system, by means of an AD/DA acquisition board. Measured values were compared to pertinent metrological standards. The results were consistent and demonstrated the efficiency of the proposed measuring system, both technically and economically.

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Spedale, Simona. "The emergence of the network supply-chain : a study of co-operation and performance in supply-chain relationships in the UK fibre-optics industry." Thesis, City University London, 2000. http://openaccess.city.ac.uk/8167/.

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This study focuses on the emergence of a new governance form, the network supplychain, in the UK optical communications systems industry. In doing so, it pursues two objectives. The first is to investigate the extent of the shift from market-oriented to co-operation oriented mechanisms in governing supply relationships. The focus is on the contingencies of this change and, in particular, on the impact of technology on the development of co-operative forms of governance. The second objective of the research is to test the linkage between governance forms in the supply-chain a nd organisational. Performance, particularly efficiency and innovation. Again, the impact of technology on this relationship is put to test. The study relies on a combination of secondary, survey and interview data. The key finding is that the degree of maturity of the technology has an impact on both the type of co-operative form governing supply relationships and its relationship with organisational performance. For performance, co-operative governance forms in the supply-chain have a positive impact on efficiency (both global and partial) and innovation when the core technology of the firm is mature. When a radically new technology is still emerging, the network supply-chain has a limited positive impact on efficiency (partial only) and a negative one on innovation. Moreover, in emergent industries, the network supply-chain can hamper and delay technological development. For the type of co-operative form, we identify two models of co-operative supply relationships, respectively named the exploitative and the explorative model. These are ideal-types that take into account the connection between technology, governance mechanisms, and organisational performance, and can be found in more or less pure form in real contexts. The exploitative model is consistent with environments where the technology is well established; 'exploitation' is the main strategic driver; and efficiency and incremental innovation the predominant objectives. The explorative model is consistent with environments where a specific technology has not yet established itself as the dominant one; 'exploration' is still a strategic priority; and the search for opportunities to diffuse the emergent technology is the fundamental objective. Both the exploitative and the explorative models need a 'trigger' to develop in contexts previously dominated by market-oriented mechanisms. In other words, the change in governance forms in the supply-chain only occurs in response to an external event or condition.

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Taheri, Benjamin [Verfasser], Bernd [Akademischer Betreuer] Brügge, Birgit [Gutachter] Vogel-Heuser, and Bernd [Gutachter] Brügge. "Application of Deep Learning for Inspection in Industrial Overhaul Processes / Benjamin Taheri ; Gutachter: Birgit Vogel-Heuser, Bernd Brügge ; Betreuer: Bernd Brügge." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1220321184/34.

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Dissertations / Theses on the topic 'Optics in industrial inspection'

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