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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Learning picture languages using restarting automata
 Krtek, Lukáš ; Mráz, František (advisor) ; Průša, Daniel (referee)
There are many existing models of automata working on two-dimensional inputs (pictures), though very little work has been done on the subject of learning of these automata. In this thesis, we introduce a new model called two-dimensional limited context restarting automaton. Our model works similarly as the two-dimensional restarting tiling automaton, yet we show that it is equally powerful as the two-dimensional sgraffito automaton. We propose an algorithm for learning of such automata from positive and negative samples of pictures. The algorithm is implemented and subsequently tested with several basic picture languages. Powered by TCPDF (www.tcpdf.org)
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Rendering of Gemstones
 Krtek, Lukáš ; Pelikán, Josef (advisor) ; Karlík, Ondřej (referee)
The distinctive appearance of gemstones is caused by the way light reflects and refracts multiple times inside of them. The goal of this thesis is to design and implement an application for photorealistic rendering of gems. The most important effects we aim for are realistic dispersion of light and refractive caustics. For rendering we use well-known algorithm of path tracing with an experimental modification for faster computation of caustic effects. In this thesis we also design and implement a tool for generating polygonal models of gemstones based on a simple user description.
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