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Filtering methods for NMR measurements
Nezhyba, Jiří ; Mikulka, Jan (referee) ; Gescheidtová, Eva (advisor)
This master’s thesis deals with the wavelet transform and its use in processing and removing noise from images acquired by nuclear magnetic resonance. It defines fundamental terms for this work as mother wavelet or thresholding. Above all, it describes the principle of wavelet transform, thresholding techniques and criteria for evaluating the effectiveness of filtration. It describes the relation between wavelet transforms and digital filter banks. The experimental section describes the designed filtering method for removing noise from an image captured by the technique of nuclear magnetic resonance. We applied to different kinds of mother wavelets. Evaluation of the effectiveness of filtering was performed using the signal to noise ratio, relative contrast and the steepness of the intensity changes in signal intensity. It also discusses the comparison of properties of the image and selecting the mother wavelets based on image characteristics. Images were compared in terms of a histogram, cumulative histogram, k-space and the difference image.
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Application for Editing the Histogram
Nezhyba, Jiří ; Kohoutek, Michal (referee) ; Říha, Kamil (advisor)
The object of this bachelor‘s thesis is create an application for editing the histogram. The program is realized by programming language C++ and programming tool Microsoft Visual C++ 2005 Express Edition. It defines fundamental terms for this work as histogram or transformation of grey level scale. Above all, it analyses individual grey level transformations, which used for editing the histogram. It describes designing and realization of application. Input data of program is any input digital image, which user order, selected grey level transformation and its parameters. Output data are input image in grey levels, histogram input image, transformed input image and its histogram. Output images can be saved.
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Application for Editing the Histogram
Nezhyba, Jiří ; Kohoutek, Michal (referee) ; Říha, Kamil (advisor)
The object of this bachelor‘s thesis is create an application for editing the histogram. The program is realized by programming language C++ and programming tool Microsoft Visual C++ 2005 Express Edition. It defines fundamental terms for this work as histogram or transformation of grey level scale. Above all, it analyses individual grey level transformations, which used for editing the histogram. It describes designing and realization of application. Input data of program is any input digital image, which user order, selected grey level transformation and its parameters. Output data are input image in grey levels, histogram input image, transformed input image and its histogram. Output images can be saved.
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Filtering methods for NMR measurements
Nezhyba, Jiří ; Mikulka, Jan (referee) ; Gescheidtová, Eva (advisor)
This master’s thesis deals with the wavelet transform and its use in processing and removing noise from images acquired by nuclear magnetic resonance. It defines fundamental terms for this work as mother wavelet or thresholding. Above all, it describes the principle of wavelet transform, thresholding techniques and criteria for evaluating the effectiveness of filtration. It describes the relation between wavelet transforms and digital filter banks. The experimental section describes the designed filtering method for removing noise from an image captured by the technique of nuclear magnetic resonance. We applied to different kinds of mother wavelets. Evaluation of the effectiveness of filtering was performed using the signal to noise ratio, relative contrast and the steepness of the intensity changes in signal intensity. It also discusses the comparison of properties of the image and selecting the mother wavelets based on image characteristics. Images were compared in terms of a histogram, cumulative histogram, k-space and the difference image.
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