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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Gradient boosted segmentation of retinal fundus images
 Goliaš, Matúš ; Šikudová, Elena (advisor) ; Škovierová, Júlia (referee)
Title: Gradient boosted segmentation of retinal fundus images Author: Matúš Goliaš Department: Department of Software and Computer Science Education Supervisor: Doc. RNDr. Elena Šikudová PhD., Department of Software and Computer Science Education Abstract: Over the recent years, there has been an increase in the use of automatic methods in medical diagnosis. A significant number of publications have analysed eye disorders and diseases. One of the most severe eye conditions is glaucoma. It damages optic nerves and causes gradual loss of vision. An essential step towards a faster diagnosis of this disease is accurate segmentation of the optic disc and cup. This task is difficult due to many retinal defects, different image acquisition techniques, and artefacts caused by imaging devices. This thesis describes an iterative threshold-based algorithm for extraction of the optic disc. An objective function quantifying object similarity to the optic disc is defined to direct the iteration. Following that, we introduce a superpixel-based classification algorithm for extraction of the optic cup. We propose the use of gradient boosted decision trees which outperform random forest and support vector machine. In addition, we evaluate the proposed algorithms and their alternatives on a publicly available retinal fundus...
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Optical analysis of pellet car damages
 Dubský, Jan ; Šikudová, Elena (advisor) ; Škovierová, Júlia (referee)
During iron processing, pelletizing is one of the necessary steps. Iron ore pellets are burned on pellet burning line, which consists of individual pellet cars. Due to constant temperature changes, pellet cars get damaged. This thesis focuses on an optical analysis of pellet car damages. The al- gorithm presented can find individual ribs of pellet car and perform analysis of their shape, position and look. Such analysis can provide basic information for damage evaluation, same as the material for further research of pellet car damage causes. 1
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