Fernando López José Miguel Valiente Ramón Baldrich María Vanrell Fast Surface Grading Using Color Statistics in the CIE Lab Space. 666-673 2005 conf/ibpria/2005-2 IbPRIA (2) http://dx.doi.org/10.1007/11492542_81 db/conf/ibpria/ibpria2005-2.html#LopezVBV05