1. Faculty of Automatic Control, Electronics and Computer Science, Silesian University of Technology, Akademicka 16, 44-100 Gliwice, Poland
2. Łukasiewicz Reasearch Network, Institute of Innovative Technologies—EMAG, Leopolda 31, 40-189 Katowice, Poland
3. Department of Informatics, University of Economics in Katowice, 1 Maja 50, 40-287 Katowice, Poland