Cen Rao Yanlin Guo Harpreet S. Sawhney Rakesh Kumar A Heterogeneous Feature-based Image Alignment Method. 345-350 2006 conf/icpr/2006 ICPR (2) http://doi.ieeecomputersociety.org/10.1109/ICPR.2006.77 db/conf/icpr/icpr2006-2.html#RaoGSK06