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Object Speed Measuring Using The Fourier Transform
Zikmund, Tomáš ; Martišek, Karel (referee) ; Štarha, Pavel (advisor)
This work deals with object speed measuring using image analysis method. The reader will become familiar with a mathematical theory upon which the method is based. The mathematical algorithm for obtaining the speed of a given object is illustrated. Furthermore, an original computer program has been developed and the results of real measuring are shown.
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Temperature drift compensation for nanostructure analysis
Hakira, Stanli ; Páleníček, Michal (referee) ; Bábor, Petr (advisor)
An ultra high vacuum apparatus for nanostructure experiments is being developed by the Tescan company in cooperation with the Institute of Physical Engineering of the Faculty of Mechanical Engineering. The apparatus is designed for preparation, modification, and analysis of nano-scale structures. A sample holder which allows heating and cooling has been developed for the apparatus. A scanning electron microscope is attached to the chamber to provide analytical and manufacturing capabilities. During experiments with heating enabled, the sample moves relative to the SEM column, causing drift of the image. This bachelor thesis proposes a solution to the problem of temperature drift by the means of motion tracking based on image registration using Fourier transform. An application complementary to the SEM control software which implements the algorithm was designed and tested at the instrument.
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High precision sub-pixel image registration methods and their applications in astrophysics
Hrazdíra, Zdeněk ; Švanda,, Michal (referee) ; Svoboda,, David (referee) ; Druckmüller, Miloslav (advisor)
Mnoho vědeckých pozorování a měření, které pracují s obrazovými daty, obsahují krok, ve kterém je nutno dané obrazy registrovat (navzájem sesadit). Výsledky těchto metod tak často silně závisí na přesnosti registrace obrazů. Tato práce popisuje novou, robustní a vysoce přesnou metodu sub-pixelové registrace obrazů (založenou na registraci standardní fázovou korelací) a její aplikace v různých oborech.
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Calibration and interpretation of images measured by LEEM
Endstrasser, Zdeněk ; Novák, Jiří (referee) ; Čechal, Jan (advisor)
This thesis deals with the software development to calibration and interpretation of image data measured by a LEEM device. As the imaging technique is uniquely suited for in-situ studies of surface dynamical processes, the attention is mainly paid to methods enabling the evaluation of measurement time series. The phase correlation method based on Fourier transform of images is proposed to temperature shift correction between consecutive frames. The thesis describes the methods of additive and impulse noise filtering, image visualization, the filtration of secondary electrons and the determination of I-V curves from measured image data. Implemented methods are described not only in terms of their mathematical origin, but also with emphasis on the revealing of critical aspects associated with their use. The thesis also focuses on the application of the created algorithm to image data capturing the spatial and temporal evolution of 4,4’-biphenyl-dicarboxylic acid surface phases induced by sample annealing. Based on these evaluations, a suitable procedure is then determined to perform accurate detection and compensation of temperature shift said.
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Numerical methods of image processing from NASA's SDO space probe
Meduňa, Tomáš ; Druckmüller, Miloslav (referee) ; Hoderová, Jana (advisor)
Tato práce se zabývá zpracováním snímků Slunce pořízených kosmickou sondou SDO na různých vlnových délkách a vizualizací výskytu třikrát ionizovaného uhlíku C IV jejich vhodným složením. V práci jsou uvedeny základní informace o Slunci a jeho atmosféře, dále je shrnuta potřebná teorie a možné postupy vizualizace, které jsou následně vyhodnoceny a porovnány. Součástí je i vytvořený program pro snadnou tvorbu snímků vizualizujících uhlík C IV.
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Temperature drift compensation for nanostructure analysis
Hakira, Stanli ; Páleníček, Michal (referee) ; Bábor, Petr (advisor)
An ultra high vacuum apparatus for nanostructure experiments is being developed by the Tescan company in cooperation with the Institute of Physical Engineering of the Faculty of Mechanical Engineering. The apparatus is designed for preparation, modification, and analysis of nano-scale structures. A sample holder which allows heating and cooling has been developed for the apparatus. A scanning electron microscope is attached to the chamber to provide analytical and manufacturing capabilities. During experiments with heating enabled, the sample moves relative to the SEM column, causing drift of the image. This bachelor thesis proposes a solution to the problem of temperature drift by the means of motion tracking based on image registration using Fourier transform. An application complementary to the SEM control software which implements the algorithm was designed and tested at the instrument.
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Retinal image registration using phase correlation
Prosser, Jan ; Harabiš, Vratislav (referee) ; Kolář, Radim (advisor)
This master’s thesis is aimed at registration of frames of retinal fundus video using phase corre- lation. An introduction describes general research in topic of retinal fundus, eye movements, diff erent approaches for image registration, phase correlation and examples of phase corre- lation applications. The second, practical part of master’s thesis, is dedicated to description of the proposed algorithm for registration of frames of retinal fundus video. The description of the proposed algorithm is divided into three parts. First two parts describe how frames of retinal fundus video are rated in terms of suitability for registration. Third part describes image registration algorithm itself. In conclusion, the accuracy of algorithm and computational time are evaluated.
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