Automatic facial expression recognition: A survey based on feature extraction and classification techniques

Abstract

Facial expression carries information about the emotional and physical state of a human being. In the past few years facial expression recognition has become a promising research area. With the developing robotic era the systems needs intelligence to understand human's behavior. Expression recognition is applied and useful from emoticons to disease detection in medical field. Apart from automated systems the applications include human-computer interfaces, human emotion analysis, awareness systems, surveillance and security, medical diagnosis, law enforcement, automated tutoring systems and many more.