1. Department of Optics and Optometry, Technical University of Catalonia, Terrassa, Spain,
2. Department of Applied Mathematics , Technical University of Catalonia, Terrassa, Spain
3. Department of Optics and Optometry, Technical University of Catalonia, Terrassa, Spain
4. Department of Statistics and Operations Research, Technical University of Catalonia, Terrassa, Spain
5. Institute of Textile Research and Industrial Cooperation (INTEXTER), Technical University of Catalonia, Terrassa, Spain