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Embedded QR code generator with a graphic OLED display
Lakomý, Tomáš ; Krajsa, Ondřej (referee) ; Hanák, Pavel (advisor)
This master’s thesis deals with coding information and QR codes generating. There is described operation principle of QR codes for this purpose, and design of the equipment. This device is able to encode the information received through the serial port and display it in the QR code on the OLED display. Microprocessor is part of the device, so there is outlined the procedure for programming and testing equipment.
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Comparison of Multimedia Signal Compression Possibilities
Špaček, Milan ; Mišurec, Jiří (referee) ; Škorpil, Vladislav (advisor)
Thesis deals with multimedia signal comparison of compression options focused on video and advanced codecs. Specifically it describes the encoding and decoding of video recordings according to the MPEG standard. The theoretical part of the thesis describes characteristic properties of the video signal and justification for the need to use recording and transmission compression. There are also described methods for elimination of encoded video signal redundancy and irrelevance. Further on are discussed ways of measuring the video signal quality. A separate chapter is focused on the characteristics of currently used and promising codecs. In the practical part of the thesis were created functions in Matlab environment. These functions were implemented into graphic user interface that simulates the activity of functional blocks of the encoder and decoder. Based on user-specified input parameters it performs encoding and decoding of any given picture, composed of images in RGB format, and displays the outputs of individual functional blocks. There are implemented algorithms for the initial processing of the input sequence including sub-sampling, as well as DCT, quantization, motion compensation and their inverse operations. Separate chapters are dedicated to the realisation of codec description in the Matlab environment and to the individual processing steps output. Further on are mentioned compress algorithm comparisons and the impact of parameter change onto the final signal. The findings are summarized in conclusion.
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LPC Speech Coding
Zapletal, Ondřej ; Kyselý, František (referee) ; Rajmic, Pavel (advisor)
The contents of the thesis "LPC speech coding" are studies of this method of a parametric source coding, explanation of mathematical procedures that are used in it (linear prediction, autocorrelation, Levinson-Durbin algorithm, transfer to a form suitable for transmission, Chebyshev root searching polynomial method) and acquaintance with the signification and application of that method in real speech encoders. The task of the original project of this thesis is a description and simulation of a simple speech encoder based on LPC, which transforms a real speech signal into a bit flow, which contains all of the significant parameters for its backward reconstruction (LSF coefficients, pitch period, excitation level, voice detection - AMDF method). One part of this thesis is a discussion about currently used speech encoders.
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Making OpenType fonts with free software
Bednár, Peter ; Mekyska, Jiří (referee) ; Rajmic, Pavel (advisor)
In thesis themes of typography and computer font of OpenType format is described in details. At the beginning attention is paid to historical development of typeface, where stress is laid mainly on development of Roman and white letter with their characteristics. Having presented basis of typography work is concentrated on topic of digital font with emphasis on possibilities of OpenType format. Further its characteristics and advantages were listed compared to another formats and it was evaluated as format appropriate also for creating font in education process. Letterspacing and kerning were mentioned between basic graphical modifications in creating fonts. In theoretical part of the thesis they were examined in available programs designed for creating font in OpenType format. Except free available means into summary were included also commercial types due to absence of more advanced instruments and functions with free available applications. In evaluation was found that the most convenient for education is Fontlab Fontographer commercial program, free Type lite and Fontforge indicated for Open-source platform. Practical part of the thesis is focused on two chosen programs for creating main font characteristics. The goal was to detect if it is possible to reach identical results when using both programs. Fontographer program enabled to use wide tool palette dedicated to vector graphic processing by means of Adobe Illustrator similar instrument. In the case of Type lite program there were rather less instruments, what is sufficient for elementary work and familiarization with creating of digital typeface. Freeware shortage is basic absence of kerning, spacing or hinting functions. Comparing program possibilities, it falls that freeware programs based on OS Windows with their functionality are sufficient only for entry level users. The best option within free available programs is Fontforge for OS Linux which supports mentioned typographic functions. Fontographer was recommended for teaching of basic characteristics of OpenType font format. Another goal of the thesis was creating of recommended work procedure for creating basic characteristics of OpenType font for students, that is enclosed at the end of the thesis.
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Optimization of data communication over high-voltage lines
Minárik, Peter ; Krajsa, Ondřej (referee) ; Mlýnek, Petr (advisor)
The thesis deals with analysis of the PLC (Power Line Communication) system for data communications through powerlines. In the introduction describes the technology of data transmission through the energy network and is divided into categories corresponding with the explanation of the various specifications and features. Different types of coding, affecting the transmitted signal interference and modulation techniques used in a PLC are also described. The practical part is made up of telecommunications network model with transmission channel realized as additive white noise. The model can setup different types of modulation and coding in relate with the signal to noise ratio and bit error rates. The individual blocks settings are described in detail. The model was simulated. The results of simulation are displayed and evaluated at the end of work.
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Analysis and development of responsive website interface
Beránek, Jakub ; Střížová, Vlasta (advisor) ; Soukup, Petr (referee)
The thesis deals with the analysis and development of responsive interface of online stores' websites. The work is divided into several chapters, which can be divided generally into two main parts, theoretical and practical. In the first theoretical part there are different perspectives and analyzes, that need to be defined for web development and possibilities of progression of the web sites along with testing the correctness of individual steps and procedures, explained. The practical part consists in the implementation of the proposals and creating designs typical for company based on informations gathered from the analysis of the accessibility and usabiity of original pages and pages of competition. Part of crafting proposals and graphics is user testing, processing comments and found bugs. Thanks to these aquired knowledge there is in the final part designed and implemented new look along with a basis for possible further development and expansion opportunities in the future.
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Analysis of High Efficiency Video Coding
Svoboda, Jaroslav ; Ivánek, Jiří (advisor) ; Palovský, Radomír (referee)
Standard MPEG-H part 2/H.265 alias High Efficiency Video Coding (HEVC) is patterned on MPEG-4 part 10/H.264. Although it is A new standard developed to be more efficient, its implementation is sequential and therefore there are no guarantees that the output video file will achieve the quality it possibly can within this standard. To determine how this hypothesis is fulfilled, this thesis uses the methods PSNR and SSIM which compare input and output. Another consideration is computational complexity or, in other words, the power demand, which was tested by comparing the battery life of two cell phones. Test results confirmed higher compression effectivity and higher computational complexity of standard MPEG-H part 2/H.265 as well.
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Participation in youth house Analysis of the participation: Youth house management possibilities for inhabitants (Youth house in Pisek).
KEMPFER, Heřman
This thesis aims to analyze the possibilities of participation in youth home in Písek. The work deals with participation in youth home in Písek. The theoretical part will first introduce the surveyed organization. In the next chapter,I define the concept of participation and then concentrate on the current view of participation in youth home. The following chapters are devoted to communication, working with groups and individuals and personality of educator. The research section describes the definition of research and the topics. Following the interview, as other research method. The whole thesis concludes final summary and answer to research quest.
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