Xiaoxu Zhou Xiangsheng Huang Yangsheng Wang Real-Time Facial Expression Recognition in the Interactive Game Based on Embedded Hidden Markov Model. 144-148 2004 conf/IEEEcgiv/2004 CGIV http://doi.ieeecomputersociety.org/10.1109/CGIV.2004.1323975 db/conf/IEEEcgiv/cgiv2004.html#ZhouHW04