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ECG signals compression
Botlová, Simona ; Vítek, Martin (referee) ; Smital, Lukáš (advisor)
This bachelor thesis deals with the compression of ECG signals using wavelet transform and run length encoding. The principles of electrocardiography, compression methods, wavelet transform and run length encoding are described in this thesis. There was created a program to compress and decompress ECG signals in MATLAB interface. The wavelet transform settings and their influence on compress ratio and percentage root mean square difference were tested. Subsequently, the appropriate adjustment of algoritm was found and it was used on CSE database compression.
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Lossless Video Compression
Polák, Michael Adam ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This thesis is describing methods of lossless video compression. It also contains the description and formulas for conversions of color models suitable for lossless compression. The last theoretical part describes context compression and entropy coding with emphasis on arithmetic coding. Following the arithmetic coder is the description and details about the implemented video codec. This codec is then tested and compared with the currently used FFV1 and Huffyuv codecs. The result of this thesis is that adding the number of contexts improves the compression ratio although it does not outperform the compression ratio of FFV1, the compression ratio of Huffuyv was always outperformed.
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Graphics Intro 64kB Using OpenGL
Bobuľa, Matej ; Milet, Tomáš (referee) ; Matýšek, Michal (advisor)
This bachelor thesis deals with the problem of creating an OpenGL Graphical Intro with size limited to 64kB. It describes different techniques and methods used to create such intro. These methods are: procedural generation of terrain, procedural generation of textures, lighting, animation and particle systems. It also deals with size-reduction methods such as compiler configuration and file compression. The result of the intro is a stroll in the night on a volcanic island. Created graphics intro in its size does not exceed the given limit of 64kB.
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Very Low Bit-Rate Speech Coding Based on Neural Networks
Jochman, Stanislav ; Malenovský, Vladimír (referee) ; Černocký, Jan (advisor)
Vrámci tejto práce sme skúmali možnosti zlepšenia kvality zvuku produkovaným pomocou neurónovej siete LPCNet. Analyzovali sme vplyv použitia dátových setov zameraných na cieľový jazyk a ich vplyv na kvalitu výsledného zvuku. Pre meranie kvality kódovania reči sme využili hodnotiaci systém WARP-Q. Cieľom našej práce bolo navrhnúť vylepšenie trénovacieho dátového setu a použitie postfilterov pre zlepšenie kvality zvuku. Naše výsledky ukazujú merateľné zlepšenia s využitím malého slovenského dátového setu. Rovnako sme zaznamenali, že využitie dolnopriepustného filteru a filtra zlepšujúceho formanty zlepšilo kvalitu výsledného zvuku.
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Compression of biological sequences
Šurín, Tomáš ; Mráz, František (advisor) ; Dvořák, Tomáš (referee)
Volumes of data obtained from the next generation sequencing platforms is growing faster than the available capacity of storage media. Sequencers mainly produce short reads of DNA. However, output of the sequencing machines also contains other information, for example information about read reliability/quality. This data must be archived even after successful complete genome assembly. Standard file format used for this type of data is format SAM (Sequence Alignment/Mapping Format) and its binary compressed version BAM. In this thesis we describe the construction of a better lossless compression scheme for compression of files in the SAM/BAM format. This compression scheme provides better compression ratios than the BAM format. In addition, random access to data in the compressed file is retained. Implementation of this compression scheme is platform independent and allows simple configuration of the compression process. Implementation also offers easy extensibility. Thanks to this, we will be able to respond to changes in current sequencing platforms as well as to changes in the SAM format.
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Graphics Intro 64kB Using OpenGL
Bobuľa, Matej ; Milet, Tomáš (referee) ; Matýšek, Michal (advisor)
This bachelor thesis deals with the problem of creating an OpenGL Graphical Intro with size limited to 64kB. It describes different techniques and methods used to create such intro. These methods are: procedural generation of terrain, procedural generation of textures, lighting, animation and particle systems. It also deals with size-reduction methods such as compiler configuration and file compression. The result of the intro is a stroll in the night on a volcanic island. Created graphics intro in its size does not exceed the given limit of 64kB.
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Lossless Video Compression
Polák, Michael Adam ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This thesis is describing methods of lossless video compression. It also contains the description and formulas for conversions of color models suitable for lossless compression. The last theoretical part describes context compression and entropy coding with emphasis on arithmetic coding. Following the arithmetic coder is the description and details about the implemented video codec. This codec is then tested and compared with the currently used FFV1 and Huffyuv codecs. The result of this thesis is that adding the number of contexts improves the compression ratio although it does not outperform the compression ratio of FFV1, the compression ratio of Huffuyv was always outperformed.
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Compression of biological sequences
Šurín, Tomáš ; Mráz, František (advisor) ; Dvořák, Tomáš (referee)
Volumes of data obtained from the next generation sequencing platforms is growing faster than the available capacity of storage media. Sequencers mainly produce short reads of DNA. However, output of the sequencing machines also contains other information, for example information about read reliability/quality. This data must be archived even after successful complete genome assembly. Standard file format used for this type of data is format SAM (Sequence Alignment/Mapping Format) and its binary compressed version BAM. In this thesis we describe the construction of a better lossless compression scheme for compression of files in the SAM/BAM format. This compression scheme provides better compression ratios than the BAM format. In addition, random access to data in the compressed file is retained. Implementation of this compression scheme is platform independent and allows simple configuration of the compression process. Implementation also offers easy extensibility. Thanks to this, we will be able to respond to changes in current sequencing platforms as well as to changes in the SAM format.
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ECG signals compression
Botlová, Simona ; Vítek, Martin (referee) ; Smital, Lukáš (advisor)
This bachelor thesis deals with the compression of ECG signals using wavelet transform and run length encoding. The principles of electrocardiography, compression methods, wavelet transform and run length encoding are described in this thesis. There was created a program to compress and decompress ECG signals in MATLAB interface. The wavelet transform settings and their influence on compress ratio and percentage root mean square difference were tested. Subsequently, the appropriate adjustment of algoritm was found and it was used on CSE database compression.
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