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Demonstrational programs for music record processing
Jonáš, Petr ; Rajmic, Pavel (referee) ; Číž, Radim (advisor)
This bachelor’s thesis describes the processing of music records and signals. Demonstration programs were created in Matlab. In this thesis were created function of equalization, transposition and sound effects. In this thesis was created application for determining the similarity of signals. For both programs was created graphic user interface.
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Vibrodiagnostics of electrical machines
Boháček, Daniel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This thesis deals with methods of vibration analysis in electric rotating machines. From the beginning, it is necessary to explain the basic concepts and introduce the issue of vibration. Next time, the work is focused on sources of vibration in electrical machines. Defects on electric rotating machines causing vibrations are described. Sensing is performed using sensors of deflection, speed and acceleration. The measured signal needs to be adjusted and filters, approximations and sampling will cover this in the next chapter. The main objective is the methods of analysis, which include the best known in the field of frequency analysis (FFT) and the envelope method in the time domain. This includes other methods such as Kurtosis factor, Crest factor, etc. There is also a basic block diagram for measuring vibrations. This block diagram is programmed and has a graphical user interface. The last part is an evaluation of the measured data of the engines.
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Radon daughter products absorption by filters
Šálek, Ondřej ; Jáně, Zdeněk (advisor) ; Matolín, Milan (referee)
The work is engaged in effect of short-lived radon (222 Rn) daughter products on measurement of radon volume activity in soil gas. Solid radon daughter products 214 Po and 218 Po transform by α-decay and influence measurement of radon volume activity in soil gas. This effect was investigated by experimental measurement of radon volume activity in soil gas at the Buk radon reference site in Central Bohemia. At each particular point of radon reference site, three values of radon volume activity were determined by measuring; without filter, with automobile petrol filter and with micro-fibrous filter AFPC type. Experimental measurement demonstrates that both of applied filters have near the same effect on measured values of radon volume activity in soil gas. The difference between radon volume activity values got by measuring without filter and with filters is low, in order of measurement error. Experiment did not evidence necessity of using filter for measuring radon volume activity in soil gas. Radon volume activity measurement error is in order of several kBq.m-3 . This fact brings uncertainty into obtained results. The absence of theoretically possible high content of solid radon daughter products in soil gas samples may be explained by possible adsorption of these particles on sampling and soil...
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Modular Active Crossover Network - Laboratory Tool
Holínský, Jan ; Hanák, Pavel (referee) ; Balík, Miroslav (advisor)
This thesis is about design of active frequency crossovers and their implementation. The work analyses particular types of circuits used in active frequency crossovers, especially circuits used for laboratory device. Then the work describes design of printed circuit boards (PCB) for the designed circuits and construction of modules for the laboratory device, when the compatibility and modularity is important for all active frequency crossovers arts. These modules are made and testing its functions. In this thesis is disassembled final proposal laboratory device and laboratory device is realized. The design and measurement of the characteristics of active frequency crossovers and correction circuits is processed in the form of a laboratory tasks.
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Online Image Editor
Vodák, Jakub ; Přibyl, Bronislav (referee) ; Svoboda, Pavel (advisor)
The purpose of this thesis is create application for online editation of static image. The main objective is user-friendly interface and simplicity. Basic graphic operations are available. The application allows you to create user accounts and the related ability to manipulate and share images. It is based on Adobe Flash and programming language ActionScript 3.0.
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Multifilter-based Image Viewer
Hanák, Drahomír ; Zavoral, Filip (advisor) ; Kliber, Filip (referee)
The aim of this work is to design and implement a photo viewer program that can save user-defined metadata directly in photo files. That way, metadata will not be lost in case files are renamed or moved. Other goal of this work is to design a query language which can be used to search photos based on both the user defined metadata and existing file metadata. Created program should have a customizable user interface for viewing query results, editing user defined metadata and query editor which has a code-completion (IntelliSense) support. 1
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Numerical Methods of Image Analysis in Astrometry
Honková, Michaela ; Martišek, Dalibor (referee) ; Zemek, František (referee) ; Druckmüller, Miloslav (advisor)
Velmi přesná následná astrometrie je nezbytným předpokladem sledování blízkozemních objektů, které mohou představovat riziko srážky se Zemí. Tato práce přináší ucelený přehled přesné astrometrie, obsahuje potřebnou matematickou teorii, postup předzpracování snímků v astronomii, a nastiňuje použití filtrů. Navrhuje nové metody pro vyrovnání pozadí snímků před provedením astrometrického měření pro případ, kdy nejsou dostupné kalibrační snímky. Tyto metody jsou založeny na vytvoření syntetického flatfieldu pomocí aplikování filtru na snímek a následné užití tohoto flatfieldu pro odstranění pozadí snímku. Metody byly otestovány na vzorových snímcích a vzápětí použity k získání astrometrických pozic prvního mezihvězdného objektu 1I/2017 U1 ('Oumuamua).
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Detection of car approach speed using camera imge processing
Kovář, Jan ; Číka, Petr (referee) ; Šmirg, Ondřej (advisor)
The thesis deals with digital image processing, from the initial acquisition of digital picture frames, subsequent processing segmentation and algorithms to detect visual shapes on the scene. Image processing is a very broad topic, so here are analyzed for more understanding of the fundamental principles of perception and processing of video signals, image representation, his starting shooting through filters governing digital image processing methods to detect the objects in an image. It is also demonstrated by the size dependence of the object in the image on the distance from the camera, whereby we can determine the speed of approaching or moving away from the object. We will show you the specific determination of the distance we need to know the actual result size of the object. This is because the ratio between the size of the object depending on the distance is the same for each object. Finally, this work presents the resulting image frames for implementation using OpenCV library.
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Utilization of sampling filters from the Kresin atmospheric station for further analysis
Vítková, Gabriela ; Kahoun, D. ; Strnadová, G. ; Hanuš, Vlastimil ; Petrov, M. ; Tříska, Jan ; Holoubek, Ivan
The Kresin At Pacov Atmospheric Station serves as a monitoring point for the occurrence and remote transmission of greenhouse gases, selected atmospheric pollutants and basic meteorological characteristics. The determination of the GHG concentration (CO2, CH4, N2O, CO) is carried out in air continuously sampled at 10, 50, 125 and 250 m heights. The analysis itself takes place at the foot of a high mast where the air is drawn through the tubes of Synflex 1300. lines and individual analyzers are protected from mechanical pollution by input filters that are changed at regular intervals as part of the routine maintenance of the device or earlier when unexpected clogging occurs. Analyzing these filters can provide additional information about the surrounding area. These are stainless filters (Swagelog „T“ filter) with a porosity of 40 μm. A sampling head is provided in front of them to protect them from rough dirt and water drops. The volume flow of the scrubbed air is about 15 l / min, the exchange interval is usually 3 months. The need to replace these filters has increased in recent months as the flow rate on the sampling lines has fallen. The question arises as to how long the filters remain fully passable and how well they serve their purpose without burdening the sampling system and lowering the measurement quality. The results of analyzes of polycyclic aromatic hydrocarbons (PAHs) carried out on filters at the Institute of Chemistry and Biochemistry of the Faculty of Science of South Bohemian University as well as images from the Scanning Electron Microscope (SEM) could be helpful in answering this question. On the basis of the preliminary results, we propose a more extensive study for the use of this waste material for the analysis of solid particles from the atmosphere in the surroundings of AS Křešín near Pacov and the optimization of the QA / QC sampling systems of greenhouse gas analyzers.
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Inteligent Video-Player
Sabela, David ; Materna, Zdeněk (referee) ; Kapinus, Michal (advisor)
The aim of this bachelor thesis was to create a user interface for displaying interesting or indifferent way significant events from the views of surveillance camera systems. In the first part of the thesis - Theory - technologies useful for the creation of a web application working with video are described. Principles of graphical quality in user interferences are also summarized in this part, as well as explanation of the principal questions of the surveillance camera systems problematics. In the second and third part - Design and Implementation - my own solution of the prototype of inteligent video player is depicted. The resulting prototype is thereafter subjected to examination by several testers whose results are analysedand evaluated in the final part - Testing.
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