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Lossless Image Compression Using Wavelet Transform
Tumpach, Jiří ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This work focuses on wavelet transform and its use in image compression particularly on a comparation between classical tensor product wavelets and new kind of second generation wavelet also known as red-black wavelet transform. Although brief comparison of EBCOT modifications, color transforms, wavelets and predictors are discussed too. A framework for an evaluation of some current methods is constructed and results across different image groups are presented. In addition, C++ library was created. Proposed lossless compression methods are better then JPEG 2000 and PNG.
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Lossless Video Compression
Kafka, Jan ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This thesis is about the lossless video compression using 3D prediction. At first is introduced the necessary theory about image data modification. This part serves to define important terms, which are needed to start the creative work itself. Then several variants of codec's structure proposals follow, as well as the choice of methods and description of expected characteristics. Here we can get the first idea how the codec works. Then there is a description of some implementation's details, which could give a detailed insight into the codec's inner architecture. In the last part of the work, the implemented codec is tested and its characteristics are compared to another lossless codecs. The result is that the own codec, using the 3D prediction, can defeat all other tested codecs with its compression ratio.
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Histopathological predictors of clinical course severity and development of surgical complications in children with inflammatory bowel diseases
Fabián, Ondřej ; Zámečník, Josef (advisor) ; Daum, Ondřej (referee) ; Karásková, Eva (referee)
The aim of the presented thesis is to summarize a benefit and limitations of histopathological assessment of bioptic samples for diagnostics and prediction of complicated course of the disease in children with inflammatory bowel diseases (IBD). We would also like to outline a potential benefit of more sophisticated histopathological methods in these domains. In the first phase of our research, we aimed at correlation of microscopical disease activity in children with Crohn's disease (CD) with activity assessed endoscopically and clinically. We also examined a histopathology as a possible predictor of development of complications, since previous works on adult cohorts indicate only a limited predictive value of microscopy. Our study confirmed this premise also for pediatric patients, since histopathological findings correlated weakly with endoscopy, didn't correlate with clinical activity of the disease and did predict none of the defined complications. On the other hand, endoscopy appeared to be a reliable predictor of complicated course of the disease. In the next part of our research, we were searching for other, more precise methods of assessment of histopathological disease activity that could serve as predictors of complications. We focused at immunohistochemical assessment of tissue...
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Biochemical predictors of the treatment failure in pediatric IBD patients
Zárubová, Kristýna ; Bronský, Jiří (advisor) ; Hrdý, Jiří (referee) ; Petrášová, Miroslava (referee)
Up to 20 % of patients with IBD (inflammatory bowel disease) is diagnosed in childhood, the course of the disease tends to often be more severe and the treatment more difficult than in case of adults. Therefore, it is necessary to commence or eventually change the treatment in order to prevent development of complications. Early detection of relapse plays significant role for further course of the disease and general prognosis of the patient. Changes to laboratory parameters (e.g. to the level of fecal calprotectin) can significantly prevent the development of clinical symptoms and may indicate the necessity for control endoscopy, further escalation or change in therapy. The primary focus of this thesis are patients who underwent surgical bowel resection, who constitute one of the risk groups. Studies show that as many as 70 % of patients suffering from Crohn's disease reach the point of bowel surgery within the first 10 years of the diagnosis. According to the results, a promising predictor of relapse of the disease seems to be serum albumin, which may relate to the overall nutritional status of the organism. We have also examined the effectivity of using fecal calprotectin and CRP as relapse predictors. Testing directly in the resected bowel did not prove usability of calprotectin as a predictor,...
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Lossless Image Compression Using Wavelet Transform
Tumpach, Jiří ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This work focuses on wavelet transform and its use in image compression particularly on a comparation between classical tensor product wavelets and new kind of second generation wavelet also known as red-black wavelet transform. Although brief comparison of EBCOT modifications, color transforms, wavelets and predictors are discussed too. A framework for an evaluation of some current methods is constructed and results across different image groups are presented. In addition, C++ library was created. Proposed lossless compression methods are better then JPEG 2000 and PNG.
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Lossless Video Compression
Kafka, Jan ; Polok, Lukáš (referee) ; Bařina, David (advisor)
This thesis is about the lossless video compression using 3D prediction. At first is introduced the necessary theory about image data modification. This part serves to define important terms, which are needed to start the creative work itself. Then several variants of codec's structure proposals follow, as well as the choice of methods and description of expected characteristics. Here we can get the first idea how the codec works. Then there is a description of some implementation's details, which could give a detailed insight into the codec's inner architecture. In the last part of the work, the implemented codec is tested and its characteristics are compared to another lossless codecs. The result is that the own codec, using the 3D prediction, can defeat all other tested codecs with its compression ratio.
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