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Detection of optic disc from fundus camera sequences
Juráček, Radek ; Harabiš, Vratislav (referee) ; Hracho, Michal (advisor)
This semestral thesis deals with shape detection in images and application of it for detection of optic disk in sequence of fundus camera images. It describes major features of the human eye and retinal diseases. Further the thesis discusses some methods of image preprocessing, segmentation and generalised Hough transform for fundus images which is the main work content for optic disc localization. Practical part describes the proposed methods for detection of optical disk based on a circular Hough transformation and adapted filtering. Method of adaptad filtering achieved median of overlap 59,1%, method using fast Hough transform algorithm achieved median of overlap 24,95%, method using clasic Hough transform algorithm achieved median of overlap 29,95%.
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System for measurement of aerobic stability of forage
Synek, Josef ; Sekora, Jiří (referee) ; Harabiš, Vratislav (advisor)
Aerobic stability is a term which nutritionists use to define the length of time that forage remains stabil and don‘t degrade. Once fermentation is completed and the forage is exposed to air during feeding or during storage (leaky silos, poor packaging) increases the temperature of the forage initiated by yeasts or lesser extent by the action of some bacterias. This temperature is measured using temperature sensors and it is compared with the ambient temperature of the surroundings. Aerobic stability is given as the time, for which the forage temperature rises by 3°C above ambient temperature.
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Design of On Demand Cardiac Pacemaker in LabVIEW
Sekera, Lukáš ; Harabiš, Vratislav (referee) ; Sekora, Jiří (advisor)
First part of bachelor’s work is describing fiction of human heart, there is noted an analysis of EKG signal and designed simple block diagram of On Demand Pacemaker for its realization in LabVIEW. In second part of bachelor’s work is description of two possibilities of costruction of the inhibition circle, which are afterwords realize in LabVIEW.
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Digital thermometer form 0 to 50 centigrades
Horváthová, Ľubica ; Harabiš, Vratislav (referee) ; Chmelař, Milan (advisor)
This thesis focuses on the general classification of temperature sensors and the choice of one exact type of sensor, that is suitable for our application. In this thesis the block diagram of the digital thermometer is described as well as the specific schematic of the digital thermometer with the respective description of each component. Beyond the assignment, there is also the construction and testing of the proposed thermometer.
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Localization of EEG scalp electrodes in structural MRI data
Koutek, Petr ; Gajdoš, Martin (referee) ; Harabiš, Vratislav (advisor)
The objective of this thesis is to design an algorithm used for localization of scalp electrodes in MRI structural data. The algorithm is based on fact that electrodes are visible on visualized head surface. The surface of a head is subdivided into smaller fragments, which are transformed from 3D space into 2D. The electrodes are then located in 2D space by use of registration techniques. The proposed algorithm is able to correctly locate up to 73% EEG electrodes, assuming that the subject has short hair. In case when a subject has long hair, the portion of correctly detected electrodes is 49%. The probability of false detection is 22% when the object is short-haired and 35% when long-haired. The algorithm should facilitate the process of EEG electrodes localization during examinations combining imaging modalities of type EEG and MRI.
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Membrane Oxygenator
Jindra, Jakub ; Harabiš, Vratislav (referee) ; Hejč, Jakub (advisor)
This bachelor thesis deals with the creation of an oxygenator for isolate rabbit’s hearts. In this work is created a mathematical model of the oxygenator and calculate optimal parameters for this application. Design of the construction solution leads to creating a 3D model and print of the oxygenator proposal and creation of the functional prototype. The conclusion of this work is the evaluation of the functionality of the equipment and the discussion of the achieved results.
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Methods of subcutaneous fat measurement
Marek, Vojtěch ; Harabiš, Vratislav (referee) ; Chlíbková, Daniela (advisor)
The thesis studies comparsion of methods of subcutaneous fat measurements. It briefly describes body composition, and deals with research of the most important methods. It describes used devices, which were used. It deals with statistical evaluation of measured data. This thesis approves, that results are different among the devices on statistically significant level, simultaneously there wasnt clear factor, that would have caused it.
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Retinal image registration based on binary vessel tree
Klímová, Jana ; Kolář, Radim (referee) ; Harabiš, Vratislav (advisor)
This bachelor’s thesis treats of binary retinal image registration. The images were photographed with a fundus camera and consequently a vessel tree has been segmented. Two binary images of the same retina have been acquired. The aim of this thesis is to acquaint with and describe methods of retinal image segmentation and registration and to suggest a process of binary image registration. The image registration is based on binary vessel tree, which is segmented with an already existing computer programme. One of the images is referred to as the reference or source and the second image is referred to as the transformed or sensed. Two image registration methods have been proposed. The first one is based on 2D transformation and image subtraction. The sensed image is rotated and translated to the position where the vessel tree is overlaid and the images are geometrically aligned. The second method uses detection of blood vessel bifurcation in the binary retinal images.
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Toolbox for neuronal datasets
Malý, Lukáš ; Harabiš, Vratislav (referee) ; Lamoš, Martin (advisor)
The aim of this bachelor's thesis was to create toolbox for functional magnetic resonance (fMRI) and electroencefalography (EEG) data processing in MATLAB enviroment using SPM software package. The first part describes the physiological origin of these data at neuronal level, basics of magnetic resonance imaging, principles of fMRI experiment, preprocessing and processing of fMRI data, their interpretation, then function and principles of EEG are described and at the end is simultaneous EEG-fMRI described. In the second part of the thesis features of each tool from Neural Data Toolbox (NDTb) are described.
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Phantom model for perfusion imaging
Borovičková, Michaela ; Harabiš, Vratislav (referee) ; Mézl, Martin (advisor)
This work focuses on issues relating to the perfusion analysis. The aim of this work is to perform experimental measurements of the phantom and then evaluate the perfusion curves. This curves are used to himation of perfusion hemodynamic parameters, which indicates important informatik about monitoring area. All processes associated with the designation and evaluation are performed in a program named Matlab. The output of work is a system that provides the reader into the problem of perfusion analysis and allows him to understand and know what is the meaning od analysis, what demands are placed on the evaluation and what is the result of this perfusion analysis.
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