,Facial Expression,facial expressions,facial expressiveness,facially expressive,Facial expressive,facial expressivity,facially expressed

Facial expression is a natural and powerful means of human communication. Recognizing spontaneous facial actions, however, is very challenging due to subtle facial deformation, frequent head movements, and ambiguous and uncertain facial motion measurements. Because of these challenges, current research in facial expression recognition is limited to posed expressions and often in frontal view. A spontaneous facial expression is characterized by rigid head movements and nonrigid facial muscular movements...

Yan Tong. For Peer Review Only A Unified Probabilistic Framework for Spontaneous...