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Má smysl vyvíjet nové metody výběru příznaků?
Somol, Petr ; Novovičová, Jana
One of hot topics discussed recently in relation to pattern recognition techniques is the question of actual performance of modern feature selection methods. Feature selection has been a highly active area of research in recent years due to its potential to improve both the performance and economy of automatic decision systems in various applicational fields, with medical diagnosis being among the most prominent. Feature selection may also improve the performance of classifiers learned from limited data, or contribute to model interpretability. The number of available methods and methodologies has grown rapidly while promising important improvements. Yet recently many authors put this development in question, claiming that simpler older tools show to be actually better than complex modern ones -- which, despite promises, are claimed to actually fail in real-world applications.
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Rozpoznávání založené na vícerozměrných modelech
Haindl, Michal ; Pudil, Pavel ; Somol, Petr
This chapter explains general model-based approaches to several basic pattern recognition applications followed by a concise description of three fundamental multi-dimensional data model classes. For each model class a solution to parameter estimation and model data synthesis is outlined. Finally an overview of the strengths and weaknesses of studied multi-dimensional data model groups is given.
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Nový algoritmus hledání cesty pro sešívání obrazů a pokročilé dlaždicování textur
Somol, Petr ; Haindl, Michal
We propose a fast and adjustable sub-optimal path search algorithm for finding minimum error boundaries between overlapping images. The algorithm may serve as an alternative to traditional slow path search algorithms like the dynamical programming. We use the algorithm in combination with novel adaptive blending to stitch image regions. The technique is then exploited in a framework for sampling-based texture synthesis where the learning phase is clearly separated and the synthesis phase is very simple.
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Informační analýza dat ze sčítání lidu pomocí statistických modelů
Grim, Jiří ; Hora, J. ; Boček, Pavel ; Somol, Petr ; Pudil, P.
We describe a new method of information oriented data analysis (data mining) based on a quick evaluation of a virtual list of several hundreds of thousands of sub-populations. The sub-populations can be ordered according to different criteria like conditional probability of a value, conditional entropy of a variable or mutual informativity of a pair of variables. In this way we can identify causal relations between values and variables in a qualitatively new way.
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