1. Department of Textiles, Faculty of Mechanical Engineering, University of Maribor, Institute of Textiles, SI-2000 Maribor, Slovenia; tel.: +38622207970; +38622207960; fax: +38622207990;
2. Department of Textiles, Faculty of Mechanical Engineering, University of Maribor, Institute of Textiles, SI-2000 Maribor, Slovenia
3. Artificial Intelligence Laboratory, Faculty of Computer and Information Science, University of Ljubljana, SI-Ljubljana, Slovenia