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Polygonal Models Smoothing
Svěchovský, Radek ; Švub, Miroslav (referee) ; Kršek, Přemysl (advisor)
Object digitizing or 3D model transformation into surface representation brings defects in the form of noise. This thesis analyses the well-known approaches to the noise elimination from polygonal models. The reader will be concerned with the fundamental principles of smoothing and foremost the results of the comparison of different methods including Laplace method, algorithm Laplace-HC, Taubin's low-pass filter and bilateral filter.
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3D Triangles Polygonal Mesh Conversion on 3D Spline Surfaces
Jahn, Zdeněk ; Šiler, Ondřej (referee) ; Kršek, Přemysl (advisor)
In computer graphics we can handle unstructured triangular 3D meshes which are not too usable for processing through their irregularity. In these situations it occurs need of conversion that 3D mesh to more suitable representation. Some kind of 3D spline surface can be proper alternative because it institutes regularity in the form of control points grid and that's why it is more suitable for next processing. During conversion, which is described in this thesis, quadrilateral 3D mesh is constructed at first. This mesh has regular structure but mainly the structure corresponds to structure of control points grid of resulting 3D spline surface. Created quadrilateral 3D mesh can be saved and consequently used in specific modeling applications for T-spline surface creation.
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3D Scene Reconstruction from Images
Hejl, Zdeněk ; Kršek, Přemysl (referee) ; Španěl, Michal (advisor)
This thesis describes methods of reconstruction of 3D scenes from photographs and videos using the Structure from motion approach. A new software capable of automatic reconstruction of point clouds and polygonal models from common images and videos was implemented based on these methods. The software uses variety of existing and custom solutions and clearly links them into one easily executable application. The reconstruction consists of feature point detection, pairwise matching, Bundle adjustment, stereoscopic algorithms and polygon model creation from point cloud using PCL library. Program is based on Bundler and PMVS. Poisson surface reconstruction algorithm, as well as simple triangulation and own reconstruction method based on plane segmentation were used for polygonal model creation.
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Building Model Generator for Open Street Maps
Libosvár, Jakub ; Láník, Aleš (referee) ; Polok, Lukáš (advisor)
This thesis deals with the procedural generation of building models based on a given pattern. The community project OpenStreetMap is used for obtaining datasets that create the buildings platform patterns. A brief survey of classifiers and formal grammars for modeling is introduced. Designing an estate classifier and algorithm for building generation is practical aspect of this thesis, including the algorithm implementation. 3D output meshes are rendered using OpenGL in real-time.
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Vector Analysis in GIS Systems
Životský, Tomáš ; Peringer, Petr (referee) ; Hrubý, Martin (advisor)
This master's thesis deals with the geographic information systems with an emphasis on so - called vector analysis . The aim of the thesis is to create a library that implements the internal representation of geographic data and performs analytical operation over them . The thesis describes the logical structure of the application and the hierarchy of abstract classes . In the form of pseudo -code is shown a set of individual computing operations . Work is strongly based on geographic system GRASS. This GIS is connectable through import and export vector data in shapefile format. Concept of storing layers is designed for ease of data manipulation and their portability . The main idea behind the application is to split the library into individual modules . These modules are independent , but also can benefit from each other's functions . In conclusion are demonstrated implemented vector analysis and representation of their calculation .
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Thematical map of carst surface - Jedovnický brook spring
Netolický, Lukáš ; Machotka,, Radovan (referee) ; Kratochvíl, Radim (advisor)
This bachelor thesis deal with creating thematical map of karst surface near spring of Jedovnicky brook. This location is in the middle of Moravian Karst. The thesis is focused on creation suitable surveying network, which was created by polygon two-side attached and oriented. Requirements for this are listed here. Surveying of individual points was realized by polar methode. The content is further description of the resulting errors in the measurements and their removal. There is also discussed creating thematic maps in CAD software. For creating thematic maps was used software Microstation developed by Bently. Work should provide opportunities for accurate orientation in the location and the possibility of better protection.
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