Using stochastic gradient-descent scheme in appearance model based face tracking.

Zhidong Li Jing Chen Adrian Chong Zhenghua Yu Nicol N. Schraudolph Using stochastic gradient-descent scheme in appearance model based face tracking. 640-645 2008 MMSP http://dx.doi.org/10.1109/MMSP.2008.4665154 conf/mmsp/2008 db/conf/mmsp/mmsp2008.html#LiCCYS08