Koichi Ogawara Xiaolu Li Katsushi Ikeuchi Marker-less Human Motion Estimation using Articulated Deformable Model. 46-51 2007 conf/icra/2007 ICRA http://dx.doi.org/10.1109/ROBOT.2007.363763 db/conf/icra/icra2007.html#OgawaraLI07