Rafael A.M. Gonçalves,  Diego R. Cueva,  Marcos R. Pereira-Barretto,  Fabio G. Cozman. 

This paper introduces a new model for the determination of conveyed emotion during a human-machine interaction, based on Kalman filtering of instantaneous facial expressions and the emotional trajectory over an emotional surface.

http://www.lbd.dcc.ufmg.br/colecoes/enia/2011/0043.pdf

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