Ferran Fabro, Politecnic University of Catalunya, Tarrasa, Spain, Reglero Victor, University of Valencia, Image Processing Laboratory, Burjassot, Spain, Joan Montanya, Universitat Politèc. Catalunya, Terrassaa, Spain, van der Velde Oscar, Polytechnic University of Catalonia, Electrical Engineering, Terrassa, Spain, Javier Navarro-Gonzales, University of Valencia, Valencia, Spain, Paul Henry Connell, University of Valencia, Burjassot, Spain and Jesús A López, Polytechnic University of Catalonia, Barcelona, Spain