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Facial Emotion Recognition in Videos Using Hmm

Human computer interaction is an emerging field in computer science. It is said that for a computer to be intelligent it must interact with human the way human and human interact. Human mainly interact through speech along with that it interact through physical gestures and postures which mainly include facial expressions. This paper discusses what the facial expressions are, the needs of recognizing the facial expression, and how to recognize the facial expression? Two such methods of recognizing the facial expressions using HMM are provided. One is Emotion Recognition from Facial Expressions using Multilevel HMM and another one compute a derivative of features with histogram differencing and derivative of Gaussians and model the changes with a hidden Markov model.