Miquel Feixas is an associate professor in Computer Science at the University of Girona. He received an M.Sc. in Theoretical Physics (1979) at the Universitat Aut�noma de Barcelona and a Ph.D. in Computer Science (2002) at the Universitat Polit�cnica de Catalunya. His research is focused on the application of Information eory techniques to Radiosity, Global Illumination, Viewpoint Selection, Scientific Visualization, Image Processing, Medical Imaging, and Computational Aesthetics. He has co-authored more than eighty papers in his areas of research. He has participated in several European and Spanish research projects. Anton Bardera is a lecturer in Computer Science at the University of Girona. He received a M.Sc. in Telecommunications engineering (2002) at the Universitat Polit�cnica de Catalunya and a Ph.D. in Computer Science (2008) at the University of Girona. His research interests include Image Processing, Information Theory, and Biomedical Applications. He has authored or co-authored more than thirty papers in his areas of interest. Jaume Rigau is an associate professor in Computer Science at the University of Girona. He received an M.Sc. in Computer Science (1993) and a Ph.D. (2006) at the Universitat Polit�cnica de Catalunya. His research is focused on the application of Information Theory to Computer Graphics and Image Processing. He has co-authored more than thirty papers in his areas of research and participated in European and Spanish research projects. Qing Xu is currently a full professor with the School of Computer Science and Technology, Tianjin University, China, where he is the director of the Information Technology Research and Civil Aviation Applications Laboratory. He got a M.Sc. (1998) and a Ph.D. (2001) in Computer Science at Tianjin University. His research activities cover interdisciplinary fields related to Computer Graphics, Visualization and Visual Analytics, Digital Image/Video Processing, Information Theory and Fuzzy Techniques. He has been leading national, international cooperation and industrial research projects. The results of his research have result in sixty publications. He also serves for the program committee and/or reviewer of a number of conferences/journals in computer graphics, virtual realities, and image/video processing.