This research was sponsored by the Spanish commission MCyT (Ministerio de Ciencia y Tecnología), and FEDER (Fondo Europeo de Desarrollo Regional) grant TIC2002-04160-C02-01.
Furthermore, we would like to thank M.-P. Dubuisson-Jolly and A. Gupta at Imaging and Visualization Department, Siemens Corporate Research, for providing the texture mosaic images.