Changchang Wu Brian Clipp Xiaowei Li Jan-Michael Frahm Marc Pollefeys 3D model matching with Viewpoint-Invariant Patches (VIP). 2008 CVPR http://dx.doi.org/10.1109/CVPR.2008.4587501 conf/cvpr/2008 db/conf/cvpr/cvpr2008.html#WuCLFP08