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Facial expressions are often classified into one of several basic emotion categories. This categorical approach seems improper to treat faces with blended emotion, as well as hard to measure the intensity of an emotion. In this paper facial expressions are evaluated with dimensional approach of affect that was originally introduced by psycho-physiologic study. An expressional face can be represented as a point in a two-dimensional (2-D) emotional space characterized by arousal and valencedoi:10.1145/1282280.1282339 dblp:conf/civr/DuBWZA07 fatcat:afnagprv55g5rpmrcn6oz4zgm4