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Automation of nuclear fuel visual inspection
Knotek, Jaroslav ; Blažek, Jan (advisor) ; Horáček, Jan (referee)
The safety and performance of nuclear plant relies, among others, on the quality of nuclear fuel. The quality fulfilling designed criteria of the fuel in use is inspected and reported on periodically. Visual inspection focuses on the condition of the fuel based on its visual properties. During the inspection, the fuel is being recorded and analysed by the inspector. The current state of the fuel assemblies is compared to the historical statistics which helps do decide whether this particular assembly remains or gets replaced. This thesis describe a project initiated by Centrum Výzkumu Řež focusing on digital image processing methods application to visual inspection process. The result of the project is a tool that accelerates the process of report making. Firstly, it transforms the inspection video into one image overview and highlight a significant part (more than 95%) of possible defects to the inspector. 1
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Sequential analysis of transaction data
Lamprecht, Matyáš ; Blažek, Jan (advisor) ; Vomlelová, Marta (referee)
Bank transactions are one of the data sources that banks can use for their marketing decisions and campaigns. In this thesis, we are concerned with the use of bank transac- tions for the prediction of clients who will take out a loan in the following month. The bank can use this information in its direct marketing. We test 2 approaches - logistic regression and recurrent neural network, where both of these approaches use information from transactions for the prediction. These two approaches are compared with each other and also with the currently used approach in the bank. The average AUC of the currently used model in the bank is 0.854, which we improved by our best model to 0.861, which is a significant improvement. Furthermore, our best model also outperforms the bank's current model in other computed metrics. 1
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Registration and determination of deformed point cloud errors
Novák, Ondřej ; Blažek, Jan (advisor) ; Mirbauer, Martin (referee)
In this work, we focus on the use of laser slit scanning rigs for 3D reconstruction of the inner parts of a nuclear reactor. Special emphasis is placed on the influence of radial distortion on the quality of 3D reconstruction. We review existing research and available tools used for camera calibration, discuss types of distortion correction models, both polynomial and non-polynomial, present algorithms for parameter estimation, and metrics for evaluation. The aim is to improve 3D point cloud registration of slit scans from multiple views with the goal of high-quality reconstruction. We examine the settings of the GoPro HERO9 Black camera, and our ability to model and correct distortion present in the lenses. We also show how applying delayed distortion correction on extracted image points can result in faster and more dense reconstruction models than early distortion correction of input images. 1
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Segmentation of images with leaves of woody species
Valchová, Ivana ; Suk, Tomáš (advisor) ; Blažek, Jan (referee)
The thesis focuses on segmentation of images with leaves of woody species. The main aim was to investigate existing image segmentation methods, choose suitable method for given data and implement it. Inputs are scanned leaves and photographs of various quality. The thesis summarizes the general methods of image segmentation and describes algorithm that gives us the best results. Based on the histogram, the algorithm decides whether the input is of sufficient quality and can be segmented by Otsu algorithm or is not and should be segmented using GrowCut algorithm. Next, the image is improved by morphological closing and holes filling. Finally, only the largest object is left. Results are illustrated using generated output images. Powered by TCPDF (www.tcpdf.org)
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Candidate selection methods and its targeting within Active Employment Policy
Blažek, Jan ; Angelovská, Olga (advisor) ; Kotrusová, Miriam (referee)
1 Abstract Bachelor's thesis "Candidate selection methods and its targeting within Active Employment Policy" focuses on applicant selection methods and criteria, usage of early assessment methods, factors influencing effects and goals of the Active Employment Policy (AEP) and evaluation of the methods and criteria, which are being used at labour offices in Prague. Theoretical section focuses on explaining several crucial terms, which are directly related to selection methods and the AEP focus. At first, a concept of AEP is introduced, followed by a section explaining individual tools. Succeeding part describes factors effecting AEP goals and factors effecting the outcome of individual measures, which are consequential to AEP programs targeting. Last section is dedicated to the methods of early assessment of high-risk groups. Analytical section contains interview analyses, which were conducted with employees of labour offices in Prague. The results are divided into five chapters according to the survey question focus area. The outcome of the survey signifies that a personal approach to each applicant is being preferred. Another crucial factor is applicant's motivation.
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Digitální restaurace nástěnných maleb
Blažek, Jan ; Zitová, Barbara (advisor) ; Pelikán, Josef (referee)
In this thesis we present the application of digital image processing algorithms for the process of fresco restoration such as image registration, image fusion, and image segmentation. We have worked with images of various modalities (visual and ultraviolet spectra) and at different times. Moreover, during the image analysis we also have taken the local chemical analysis into account. The robustness of proposed algorithms is required to be high with respect to the bad state of the fresco. The achieved results provide a better insight into the evolution of the fresco aging to the art conservators and show the way how a proper conservation method can be chosen. All developed methods are illustrated by generated output images.
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Compression of short text messages
Blažek, Jan ; Dvořák, Tomáš (advisor) ; Halas, Zdeněk (referee)
This paper describes implementation of short text message compression algorithm based on PPM. For representation of context model algorithm is used the Optimal Tree Machine data structure built on statistics of training data. Algorithm is optimized for low-level hardware device. This paper summarizes experimental results of this algorithm.
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Impact of Czech polititians foreign activities on development of foreign trade and investment
Hofman, Pavel ; Tomeš, Jiří (advisor) ; Blažek, Jan (referee)
With the continuing process of globalization, national economies are intensively interconnecting with external enviroment. It is especially visible for Czech Republic, which geopolitical position stresses the importance of external business relationships. Economic prosperity of countries with open economy is largely determined by export performance and inflow of foreign direct investments, both of which are supported by economic diplomacy. The first scope of this thesis is to evaluate the economic diplomacy of Czech Republic, and secondly to empirically analyze the tools, which economic diplomacy is using - foreign visits of polititians and role of embassies. The gravity model of international trade was used to study the influence of both tools on the foreign trade and investment in Czech Republic between years 1993-2013. The results show, that if at least one visit per year was realized, the export grows by 14%. However, one average high official visit is associated with rising exports by about 4.7%. On the other hand, any realtionship with FDI was not found. Further analysis confirms the importance of the embassies and thier positive impact on foreign trade, in particular with culturally distant countries, where this effect is more pronounced. Futhermore the study showed fading effect of economic...
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Classification of earth colours
Mareš, Jiří ; Blažek, Jan (advisor) ; Paščenko, Petr (referee)
Title: Classification of earth colours Author: Jiří Mareš Department: Department of Software Engineering Supervisor: Mgr. Jan Blažek Supervisor 's e-mail address: blazek@utia.cas.cz Abstract: This bachelor thesis is dealing with the classification of earth colours origin based on its chemical composition. For classification is used K-means classificator, Bayes classificator and self made classification algorithms. Part of this bachelor thesis is also public web service [http://klasifikatorhlinek.somee.com] that contains the classification algorithms. Key words: classification, k-means, Bayess classificator, weight ratio
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Optical Character Recognition at Camera Captured Images
Kindermann, Hubert ; Blažek, Jan (advisor) ; Kolomazník, Jan (referee)
We present solution of steps necessary for binarization and text lines detection contained in printed documents digitized by the camera. We introduce a normalization of non-uniform illumination method for text photographs. We propose input bitmap binarization algorithm based on two-dimensional probability pixel model which also considers its surrounding. We continue with description of robust text lines orientation detector based on optimization of risk function using first order derivatives of image function. In the end we present text lines detection and segmentation algorithm. Final shape of segmented lines is optimized with usage of graph algorithm. Powered by TCPDF (www.tcpdf.org)
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