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Verification of Numerical Simulation Using a 3D Optical System for Measuring Deformations
Zakl, Alexandr ; Peterková, Eva (referee) ; Řiháček, Jan (advisor)
This master’s thesis discusses the current state of optical metrology and its place in manufacturing and optimization of parts made by deep-drawing technologies. First part is devoted to building a solid knowledge base in different fields that this thesis draws from. These fields are Optical Metrology, deep drawing of sheet metal and simulations using finite elements method. Subsequently, in the experimental part there are chapters dedicated to Measurement and creation of material models and measurement of grid markings on deep-drawn parts provided by ACO Industries, measured by photogrammetric system from German Company GOM metrology. Additionally, for reference to the measurement, FEM software called PAM-Stamp is used to simulate and predict the final state of the parts after manufacturing. Furthermore, optical metrology was used during creation of material models, data supplied by this analysis was used as an input for the simulations. The last chapter then deals with the evaluation and comparison of measured and simulated data and drawing conclusions about the reliability of optical systems and modern technologies in technical practice.
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Use of photogrammetry in machine parts reconstruction
Raclavský, David ; Straka, Tomáš (referee) ; Repka, Martin (advisor)
This thesis provides a general overview of the various 3D scanner designs and focuses on 3D scanners using the principle of photogrammetry and presents their current representatives on the market. In the practical part, the procedure of constructing a machine component using reverse engineering methods is described, where the scanning process and the creation of a CAD model are presented, followed by a comparison of the result with the original 3D scan.
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Surveying of the selected object - 3D model
Petráněk, Matěj ; Švejda, Jan (referee) ; Bartoněk, Dalibor (advisor)
Diploma thesis is focused on the creation of a georeferenced point cloud and mesh model of the church of St. George in Bořitov and the documentation of the fresco of St. Christopher in the same church. The point clouds and mesh models were created based on a combination of photogrammetric processing and terrestrial laser scanning. The documentation of the fresco of St. Christopher is made in the form of the orthomosaic. The thesis comprehensively describes the creation process, especially in Agisoft Metashape and Cyclone 3DR. It also documents the accuracy achieved and suggests other forms of using the resulting products.
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Effect of the use of photogrammetry on the accuracy of a handheld laser scanner
Matuš, Vít ; Hurník, Jakub (referee) ; Koutecký, Tomáš (advisor)
This bachelor thesis is discussing The effect of using photogrammetry on the accuracy of a handheld laser scanner. Aim of the work is to determine, how much will the omission of photogrammetry impact the accuracy of data acquired by the handheld laser scanner and what other phenomena can occur by omitting the photogrammetry preparations. The goals were reached by analysing data of multiple measurements of two larger-sized objects. The acquired data were evaluated statistically for better reliability of made conclusions. The outcome was according to expectations, there were made conclusions about the influence of using the photogrammetric method on the accuracy of a handheld laser scanner. A comparison was made for marker data, mesh data and trends influencing the accuracy of measurements. Using photogrammetry, the results were up to 42,7 times more accurate in case of marker data. In case of mesh data, the results were up to 13,0 times more accurate. Thanks to this thesis a reader can have an idea about whether the use of photogrammetry method is or isn’t necessary to reach the desired accuracy, eventually what kind of undesired side-effects can occur without the use of photogrammetry.
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3D model of the Chapel of Saint Barbara
Komoňová, Pavla ; Nosek, Jakub (referee) ; Kalvoda, Petr (advisor)
The aim of this bachelor thesis is to create two 3D txtured models of the chaple of St. Barbara in Rudice. The models were created from images taken with a CanonEOS 6D MarkII SLR camera and a Xiaomi 10T Pro mobile phone using Agisoft Metashape Professional software. The achieved accuracywas tested using control points and a reference point cloud from laser scanning. The 3D model was published on the website using Sketchfab.
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Measurement and Evaluation of Axis Straightness of Rotary Forgings using Photogrammetry and Image Analysis
Zatočilová, Aneta ; Druckmüller, Miloslav (referee) ; Matula, Pavel (referee) ; Morovič,, Ladislav (referee) ; Brandejs, Jan (advisor)
The thesis deals with methodology proposal for shape and dimension measurement of rotationally symmetric forgings. Most of available non-contact systems are not possible to use for this purpose, mainly due to high temperatures and large dimensions of forgings. Only a few commercial systems which are designed for this specific measurement are currently in the market. These systems are based on a principle of evaluating time response of posted modulated signal. However, scientific literature shows also other approaches to the measurement, which are based on principle of triangulation and methods of image analysis. Advantage of systems based on these principles should be especially measurement speed and significantly lower price. The paper describes current state of research and development in this area and proposes a new approach which is based on passive photogrammetry and image analysis. The core of the work is devoted to the design of partial methods and their implementation in the Matlab programming language. Functionality of the methodology and the software has been verified by measuring cylindrical tubes of small dimensions in laboratory conditions. The designed methods were discussed and evaluated based on statistical analysis of the measurement results, and further steps to increase the accuracy and reduce the spread of results were suggested. Optimization and further development of this methodology could lead to the design a professional measuring system intended for this specific application.
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Comparation of the Methods Generation of Tie Points in Aerotriangulation
Hromková, Zuzana ; Kalvoda, Petr (referee) ; Hanzl, Vlastimil (advisor)
The subjekt of this bachelor´s thesis is to compare the methods of generation of tie points in aerotriangulation using the program Photomod 4.3 made by Russian company Racurs. Part of this thesis is a detailed of description of the project initialization, subsequent implementation of aerotriangulation and bundle block adjustment in Photomod on those images. The result is a comparison of elements of exterior orientation. and coordinate determined points processed in tables and graphs.
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Deformation measurement of motorcycle components
Augste, Jan ; Novotný, Tomáš (referee) ; Tůma, Zdeněk (advisor)
The task of this diploma thesis is technical solution for deformation measuring of motorcycle components. By reason of the technical discretion, technology of measurement was changed to another, using image processing. Retrieval which describes fundamental principle of method named photogrammetry and the main conditions of measuring. For a practical testing the carbon composite tube of main motorbike fork was used. It was loaded a with a bending moment. Due to measuring technology was changed, so the design of loading bench was change too. In the end of diploma thesis is appreciation of practical experience discovered in writing of this thesis.
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The theoretical and actual measurement accuracy of TRITOP photogrammetry system
Klus, Patrik ; Mendřický, Radomír (referee) ; Zatočilová, Aneta (advisor)
This diploma thesis examines the impact of selected factors on the measurement accuracy of Tritop photogrammetry system and verifies the validity of theoretical predictive formulas. Primary attention is given to factors that are easily influenced by the inspector - namely number of captured images, shooting distance, number of scale bars and number of coded targets. In addition, experiments dealing with the measurement automation and the use of external color filter are also described in this thesis. Seven scale bars placed on a jig of cube shape were subject of the measurements (according to VDI/VDE 2634 standard). Two approaches were used in order to obtain measurement deviations – reference values, from which the measured data were subtracted to obtain deviations, were known due to the use of scale bars. Second approach consisted in evaluation of deviations from software Tritop Professional. The results showed that the number of photographs and shooting distance have the greatest impact on measurement accuracy of Tritop system. The accuracy was also influenced by number of coded targets in the scene or by use of the external green filter. Measured data were compared to the values obtained from predictive formulas. The results showed that the formula defined by the GOM company has a prediction accuracy of more than 96 %. However the formula is dependent on the input parameter called “Image accuracy” for which the value recommendations are made in this work. The results of this work can help predict measurement uncertainties more precisely and optimize the measurement methodology of Tritop photogrammetry system.
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Use of PhotoModeler program in forensic engineering practice
Zdražilová, Alena ; Klika, Pavel (referee) ; Daňhel, Petr (advisor)
The main task of this thesis is to find out dimensions of family house from photos and after that use this dimensions to create a 3D model. Another task is to create and then test optimal procedure of taking photographs of house for the purpose of work in PhotoModeler software and subsequent processing in Autocad. The result is a model that serves for creation of sections and taking measurements necessary for valuations of a family house. The optimum process should be a compromise of the simplest and the most accurate method of creating 3D models.
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