People can recognize six basic facial expressions {facial expression recognition}: anger, disgust, fear, happiness, sadness, and surprise. Expressions have unique muscle activities {Facial Action Coding System}, grouped into Action Parts. Methods detect faces, extract features, and classify expressions. Classifying can use Gabor filters, Bézier volumes, Bayes and Bayesian network classifiers, and Hidden Markov Models.
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Date Modified: 2022.0224