Ueli Rutishauser Dirk Walther Christof Koch Pietro Perona Is Bottom-Up Attention Useful for Object Recognition? 37-44 2004 CVPR (2) http://csdl.computer.org/comp/proceedings/cvpr/2004/2158/02/215820037abs.htm db/conf/cvpr/cvpr2004-2.html#RutishauserWKP04