1. Institute of Computer Engineering, Control and Robotics, Wrocław University of Technology, Janiszewskiego 11-17, 50-372 Wrocław, Poland
2. Institute of Construction, Wrocław University of Technology, Wyb. Wyspianskiego 27, 50-370 Wrocław, Poland
3. Institute of Computer Science, University of Wrocław, Joliot-Curie 15, 50-383 Wrocław, Poland