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Tool for subjective quality evaluation of audiosignals restoration
Černý, Viktor ; Dorazil, Jan (referee) ; Záviška, Pavel (advisor)
Bacherol thesis deals with the theory of audio signal depreciation and reconstruction, with objective tests and subjective methods of reconstructed signal evaluation. At first, there are described several types of depreciation of audio signals and then reconstruction types for their reconstruction. After the reconstruction, types six objective and six subjective tests are mentioned for the evaluation of audio signal quality. The next part of the Bachelor thesis is the description of the program that was implemented in the programming language Java. The program is designed to design MOS, MUSHRA and ABX listening tests as well as to use for the actual testing. At the end of the thesis are the results of the listening tests that were used to test the program and the user ratings of the application.
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Picture Quality Analysis in Digital Television Systems
Bednarz, Robin ; Slanina, Martin (referee) ; Kratochvíl, Tomáš (advisor)
Diploma thesis deals with the analysis of quality in digital television systems and contains theoretical description of subjective and objective assessment of quality picture methods. The thesis contains short-term and long-term analysis of quality picture of terrestrial television DVB-T. Measurements and experimentations were carried out with the help of Rohde&Schwarz DVQ analyzer of picture quality and software MPEG-2 Quality Monitor and MPEG-2 Elementary stream analyzer.
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Video Quality Measurement for HEVC
Klejmová, Eva ; Veřtát,, Ivo (referee) ; Slanina, Martin (advisor)
This diploma thesis deals with standard objective and subjective video quality assessments and with analysis of their applicability to HEVC. Also basic description of video compression standard H.265/HEVC is presented. The main focus of the thesis is a creation of the database of compressed video sequences. Important parameters and features of the reference encoder HM-12 are discussed. Selected methods of objective video quality assessments are implemented on the created database. A part of this thesis is also a suggestion of method for objective video quality assessment, application of this method and associated data collection. Final data is statistically analyzed and it’s correlation with objective tests is discussed.
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Subjective quality evaluation of video sequences
Krmela, Tomáš ; Fliegel, Karel (referee) ; Polák, Ladislav (advisor)
This master´s work is focused on the comparison of subjective assessment of the quality of video sequences. In this study, data are obtained by hardware and sofware techniques and they are compared. In the introduction, methods of video compressions are described. The main part of this work deals wtih the exploring of different methods of subjective assessment of the quality of video sequences. Finally, obtained results from different methods, are evaluated and discussed.
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Measurement of quality and errors of digital video in MPEG-2 TS at DVB-T reception
Kadlček, Jiří ; Kratochvíl, Tomáš (referee) ; Polák, Ladislav (advisor)
This bachelor’s thesis describes structure of the transport stream MPEG-2 TS of the DVB-T standard and subjective and objective measuring methods of the video quality. The work also includes the description of the measurement devices and software Quality Analyzer R&S DVQ, measuring decoder ¸ DVMD, MPEG-2 Realtime Monitor, MPEG-2 Quality Monitor, which were used for the measuring the video quality and errors of the MPEG-2 TS in DVB-T. In the next part the work deals with the measurement and analysis of errors and quality of digital video stream in MPEG-2 TS. The obtained results from the measurement are presented in tables and graphically evaluated. In this work a twentyfour hour measurements of errors and quality of digital video stream in MPEG-2 TS were made. The obtained results from these measurements are evaluated and discussed. Finally, a new laboratoy work for the simultaneously measurement of the errors in video stream and video quality of the MPEG-2 TS stream was proposed.
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Simulation of the HVS characterstics in Matlab
Ševčík, Martin ; Slanina, Martin (referee) ; Kratochvíl, Tomáš (advisor)
In theoretical part Diploma thesis deals with the model of human vision HVS (Human Visual System), which can be used for image quality assessment in TV technique area. It has been described calculations of selected JND (Just Noticeable Difference) metrics, used in evaluation of HVS. In practical part of the thesis it has been suggested and realized simulation model in Matlab, which may be used for evaluation of three JND metrics from color and grayscale images and evaluation in spatial a frequency domain. Results of JND models have been compared to another objective image quality evaluation metrics (MSE, NMSE, SNR and PSNR). For interpretation of dependencies it has been used images with different defined content.
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Impact of rebuffering events on subjective QoE measurement of streaming video
Hůrek, Marek ; Pokorný, Jiří (referee) ; Kováč, Dominik (advisor)
This bachelor thesis mainly deals with the creation of a web-tool for subjective evaluation of quality of video in initial and repeated video loading and buffering. The simulation of adaptive streaming, focused on buffering, is performed on the basis of scenarios created in the database that are randomly generated and implemented into the aforementioned web-tool. The theoretical part of this thesis is focused on the analyzation of different types of streaming, streaming services and QoE service (subjective and objective evaluation). Two basic methods for the subjective evaluation (laboratory method and crowdsourcing) are described in more detail. At the end there are analyzed data received from measurement. Results are put into graphs with a description of subjective evaluation MOS.
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Possibilities of use of questionnaire WHODAS 2.0, regarding physiotherapy of patients with diagnosis of Central Hemiparesis
Matiaško, Dušan ; Sládková, Petra (advisor) ; Rodová, Zuzana (referee)
Bachelor's Thesis Abstract Autor: Dušan Matiaško Supervisor: MUDr. Bc. Petra Sládková, Ph.D. Title: The possibilities of use of questionnaire WHODAS 2.0, regarding physiotherapy of patients with diagnosis of Central Hemiparesis This Bachelor's Thesis deals with the issue of subjective assessment of disability in patients with central hemiparesis. Objective testing cannot comprehensively capture an individual's overall experience stemming from his/her health condition. On the other hand, subjective evaluation using the WHODAS 2.0 questionnaire, provides specific information about the most problematic areas of their life as experienced by the individual. This allows the examiner to directly address these issues and achieve a better therapeutic effect. Alternatively, it may also lead to acknowledging that the appropriate solution lies within the expertise of other specialists. Objectives: The main objective of the thesis is to outline the impact of a rehabilitation program using the WHODAS 2.0 questionnaire in all its defined domains. A secondary goal, is to compare the use of the 12-item and 36-item versions of the WHODAS 2.0 questionnaire in relation to physiotherapy. A third objective is to create a short instructional video on the practical application of WHODAS 2.0. Methods: In the practical part,...
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Evaluation of selected features of U11 players game performance
Khun, Lukáš ; Kokštejn, Jakub (advisor) ; Šťastný, Petr (referee)
Title: Evaluation of selected features of U11 players game performance Objective: The main aim of this thesis was to determine the impact of technical skills and fitness level on game performance of young football players. I also aim to discover possible differences between the First Team and Future team of SK Slavia Praha (year 2009). Methods: A quantitative research with empirical elements was employed in the practival part of the thesis. The sample consisted of the SK Slavia Praha U11 (10,85±0,24) players (n=29). The level of specific football skills was evaluated with slalom tests and Loughborough Soccer Passing test. The fitness level was measured with linear runs (10 and 20 meters), standing long jump, agility and yo-yo intermittent test. Subjective player rating of their performance was measured using a scale questionnaire for coaches. Results: Performance groups "above-average" and "average" showed a great difference in technical skills in comparison to the performance group "below-average". This was not confirmed in terms of fitness. The results in 10m sprint test, 20m sprint test and agility test were comparable. There was no confirmed difference on the team level in technical skills or fitness between the First Team and the Future team. Conclusion: The questionnaire for coaches...
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