Yaozhang Pan Shuzhi Sam Ge Hongsheng He Face Recognition Using ALLE and SIFT for Human Robot Interaction. 53-62 2009 FIRA RoboWorld Congress http://dx.doi.org/10.1007/978-3-642-03983-6_9 conf/fira/2009 db/conf/fira/fira2009.html#PanGH09