EM enhancement of 3D head pose estimated by point at infinity.

Jian-Gang Wang Eric Sung EM enhancement of 3D head pose estimated by point at infinity. 1864-1874 2007 25 Image Vision Comput. 12 http://dx.doi.org/10.1016/j.imavis.2005.12.017 db/journals/ivc/ivc25.html#WangS07