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Image quality analysis using Fourier transform
Tkadlecová, Markéta ; Druckmüller, Miloslav (referee) ; Hoderová, Jana (advisor)
This thesis deals with two-dimensional Fourier transform and its use in digital image quality assessment. An algorithm based on amplitude spectra is introduced and tested on different sets of images. Its possible use and disadvantages are described. For understanding the basics of the algorithm the fundamental mathematical theory is included. Mainly the properties of amplitude spectra are explained. Next, the theory of digital images and their characteristics, which can affect their quality, is described. For testing the quality of the image the demonstrative program has been developed.
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Controlling of camera
Tylš, Ladislav ; Valach, Soběslav (referee) ; Richter, Miloslav (advisor)
This thesis describes the principles of making application which is able to set and control camera. The first part describes basic camera connections and it explains definition and specification of camera’s features. The second part of my thesis describes implementation of application, which can use more cameras to image preview, image acquisition and to simply set of camera’s features. To implement the applications we can use MATLAB and C++BUILDER uses opencv libraries.
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Automatic Retinal Image Quality Analysis
Dovbush, Andrii ; Rydlo, Štěpán (referee) ; Kavetskyi, Andrii (advisor)
The work was carried out in the context of the development of an autonomous ophthalmological examination centre. In addition to the accuracy of assessing image quality, a significant factor was the speed of calculation of key image quality parameters, which would allow real-time operation of the centre. Based on recent researches and scientific discoveries, there was a need of additional study on algorithms' time performance. The main goal of the work was to create an algorithm for assessing image quality, based on the best combination of image quality parameters in the context of effectiveness-to-time performance. This eventually led to the development of a tool for analysing retinal image quality features and the subsequent analysis of selected combinations of IQA algorithms and image channels. Two methods for selecting the best combinations of algorithms and image channels were chosen: the absolute performance method and the relative performance method. As a result, their weaknesses were found and a possible solution to these problems was proposed by using the best-coverage approach. Approximately 150 possible combinations of quality feature and channel extraction algorithms have been collected and analysed. Among the selected algorithms it was also possible to determine the algorithms dependent on the level of image noise and also the influence of resolution downscaling on the overall performance of the different algorithms for quality features. The effect of noise on the Sobel edge detector and the Canny edge detector was explained.
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The Spectrum and ADSR analysis of different kinds of harpsichords
David, Václav ; Peloušek, Tomáš (referee) ; Jirásek, Ondřej (advisor)
The work deals with the issue of temporal analysis of the variable frequency spectrum of the harpsichord and its amplitude envelope in time. In the introduction, the creation is described, what type of instrument the harpsichord is, the history of the instrument is also described, and above all, the construction and principle of tone are described. In the following part, we deal with the measurement of the output signal itself, followed by its spectral analysis, where the topic of sound color and the behavior of the harmonic series of the tone are discussed. The formation of inharmonicity in individual registers of the harpsichord is being examined, and the last subchapter focuses on the sharpness of tone over time.
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Image quality analysis using Fourier transform
Tkadlecová, Markéta ; Druckmüller, Miloslav (referee) ; Hoderová, Jana (advisor)
This thesis deals with two-dimensional Fourier transform and its use in digital image quality assessment. An algorithm based on amplitude spectra is introduced and tested on different sets of images. Its possible use and disadvantages are described. For understanding the basics of the algorithm the fundamental mathematical theory is included. Mainly the properties of amplitude spectra are explained. Next, the theory of digital images and their characteristics, which can affect their quality, is described. For testing the quality of the image the demonstrative program has been developed.
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Controlling of camera
Tylš, Ladislav ; Valach, Soběslav (referee) ; Richter, Miloslav (advisor)
This thesis describes the principles of making application which is able to set and control camera. The first part describes basic camera connections and it explains definition and specification of camera’s features. The second part of my thesis describes implementation of application, which can use more cameras to image preview, image acquisition and to simply set of camera’s features. To implement the applications we can use MATLAB and C++BUILDER uses opencv libraries.
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