Head Pose Estimation by Nonlinear Manifold Learning.

Bisser Raytchev Ikushi Yoda Katsuhiko Sakaue Head Pose Estimation by Nonlinear Manifold Learning. 462-466 2004 ICPR (4) http://doi.ieeecomputersociety.org/10.1109/ICPR.2004.432 db/conf/icpr/icpr2004-4.html#RaytchevYS04