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Crowd simulation
Řepka, Filip ; Pelikán, Josef (advisor) ; Horáček, Jan (referee)
In recent days, the number of reasons why to be interested in the topic of crowds of agents computer simulation is increasing. The field of activity and use of this element is spreading all the time. Whether public building projects testing, investigation of individual's impact on a crowd or replacing the crowd movie scenes participants by a computer simulated agents, the crowd simulation is well efficient and often needed. The thesis could be taken as a first step to creating of a common framework applicable for a wide range of situations. It stands out from a row of recent systems with a relatively narrow field of application thanks to its commonness.
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GPU Raytracer
Herrmann, Pavel ; Pelikán, Josef (advisor) ; Horáček, Jan (referee)
Ray tracing is a popular method for generating realistic imagery, with high computation complexity and high potential for parallelization. Modern GPUs can be used as a high performance parallel co-processor, making them seemingly ideal for tasks such as ray tracing. This thesis will give an overview of ray tracing methods, overview of GPU computing methods, and present a piece of software designed for using GPU for ray tracing. This software tries to integrate classic ray tracing algorithms with specifics of GPU programming, while providing extendability and high performance.
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Segmentation of Bones in 3D CT Images
Krčah, Marcel ; Matas, Jiří (advisor) ; Horáček, Jan (referee)
Accurate and automatic segmentation techniques that do not require any explicit prior model have been of high interest in the medical community. We propose a fully-automatic method for segmenting the femur from 3D Computed Tomography scans, based on the graph-cut segmentation framework and the bone boundary enhancement filter analyzing second-order local structures. The presented algorithm is evaluated in large-scale experiments, conducted on 197 CT volumes, and compared to other three automatic bone segmentation methods. Out of the four tested approaches, the proposed algorithm achieved most accurate results and segmented the femur correctly in 81% of the cases.
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Group rings in coding theory
Horáček, Jan ; Žemlička, Jan (advisor) ; Šťovíček, Jan (referee)
This work is focused on linear error-correcting codes in group rings. The basic introduc- tion to group rings and to coding in group rings is given. By code we mean a R-submodul, which generalizes the definition of the code as an ideal. We describe unit-derived and zero- divisor codes. We test paramaters of unit-derived codes. The construction of LDPC codes without short cycles is explained. Except from the derivation of the generator and check matrix we focus on algebraic properties of codes and group rings. We also deal with the self-dual codes, reversible codes or number of units in a finite group algebra of a cyclic group. 1
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AudioCam
Hrinčár, Peter ; Horáček, Jan (advisor) ; Libič, Peter (referee)
The thesis deals with the problem of creating music through movement. Our aim is to implement software that allows the user to control a virtual musical instrument using a webcam. We focus primarily on universal interface controlled by movement. Using the differential motion analysis method and optical flow we obtain the information about a movement. Based on this information the virtual instrument creates tones using MIDI technology. Specifically, we simulate a virtual keyboard on which the user can play. We designed the virtual instrument in such a way that it could be easily extended in the future with other approaches to the process of creating music.
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Interaction of tokamak plasma with selected fusion materials
Klevarová, Veronika ; Janeček, Miloš (advisor) ; Horáček, Jan (referee)
Title: Interaction of tokamak plasma with selected fusion materials Author: Veronika Klevarová Department: Department of Physics of Materials Supervisor: Doc. RNDr. Miloš Janeček, CSc. Supervisor's e-mail address: Milos.Janecek@mff.cuni.cz Abstract: The following work is devoted to structural analysis and study of relevant physical properties of materials with perspective use for the first wall and as construction materials of the tokamak device, prior to their interaction with the high-temperature plasma in Compass-D tokamak. The theoretical part contains an introduction to the interaction of tokamak plasma with fusion materials, including a description of the processes taking place during the plasma discharge (such as implantation, erosion, particles traveling in the tokamak vacuum vessel, redeposition, co-deposition with tritium etc.) and selection of appropriate fusion materials. The experimental part consists of structural analysis of selected materials by optical and scanning electron microscopy. Analysis of the structure revealed the presence of oxide layers in some samples prepared by the technology of plasma spraying; which was probably caused by sample preparation in the ambient air. Qualitative elemental analysis of the samples was performed by electron dispersive X-ray spectroscopy (EDS) in SEM....
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Controlling computer using a detection of single colored objects from webcam
Jedlička, Richard ; Horáček, Jan (advisor) ; Libič, Peter (referee)
Computer mouse and keyboard are inseparable part of today's compu- ters. We asked a question whether we could manage without them. We proposed the concept of computer control based on gestures. Gestures are performed by user using a single colored objects captured by a camera. According to the per- formed gestures are then triggered actions. In this work we described in detail how the concept works, how to define objects, gestures and actions and how they are interconnected into a functional unit. We designed algorithms to detecting objects in the image and to gesture recognition from objects' states. Finally we created working application to use concept in practise.
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Odstranění rozmazání pomocí dvou snímků s různou délkou expozice
Sabo, Jozef ; Šroubek, Filip (advisor) ; Horáček, Jan (referee)
In the presented work we study methods of image deblurring using two images of the same scene with different exposure times, focusing on two main approach categories, the so called deconvolution and non-deconvolution methods. We present theoretical backgrounds on both categories and evaluate their limitations and advantages. We dedicate one section to a comparison of both method categories on test data (images) for which we use a MATLAB implementation of the methods. We also compare the effectiveness of said methods against the results of a selected single- image de-noising algorithm. We do not focus at computational efficiency of algorithms and work with grayscale images only.
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Framework for designing transfer function editors
Baron, Miroslav ; Krajíček, Václav (advisor) ; Horáček, Jan (referee)
There are many ways to define a transfer function for direct volume rendering (DVR). This thesis presents an universal system of transfer function editors which works also as framework for creating new types of these editors. Unified interface with proposed transfer function data structure gives us independency on used graphic engine and the possibility to work with more different editors at the same time. We can implement new technique for designing transfer function without the need of dealing with the graphic engine and we can add our new editor to this existing system in few well defined steps. We have also designed some interesting ways to define transfer function and we discuss their usefulness here.
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Procedural generation and realtime rendering of planetary bodies
Kahoun, Martin ; Horáček, Jan (advisor) ; Kmoch, Petr (referee)
The presented work deals with procedural generation of planetary bodies and their rendering in realtime. We take a closer look on one of the available methods and we try to improve the visual quality of produced models. We don't consider geophysical correctness of the planetary surface during the generation, nor we do any physical simulations to create the planets. We present what is possible by using several numbers, noise generator and fractal functions. We emphasize aesthetic feeling, and we try to other similar effect to the Google Earth, i.e., the opportunity to view a planet from high altitudes as well as a close-up zoom to the surface. Besides, we allow exporting generated models into external format suitable for processing in a 3D modelling software. We also support saving planetary parameters and their loading into the application.
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