Guang Jiang Hung-Tat Tsui Long Quan Shang-Qian Liu Recovering the Geometry of Single Axis Motions by Conic Fitting. 293-298 2001 conf/cvpr/2001 CVPR (1) http://doi.ieeecomputersociety.org/10.1109/CVPR.2001.990489 db/conf/cvpr/cvpr2001-1.html#JiangTQL01