Evandro A. Silva,  Armando Marin,  Adilson Gonzaga,  Fabiana C. Bertoni,  Kelton A.P. Costa,  Luciana A.L. Albuquerque. 

This paper presents an approach to perform neutral facial image recognition through expression facialimage using Hopfield neural networks. The dimension of neutral facial image is reduced and the imageis sliced into gray levels, from the most significant bits to the less significant bits. The same process isapplied to the expression facial image. The proposed approach using eight parallel Hopfield neuralnetworks, one for each gray level, to recognition and recover the neutral facial image based in theexpression facial image.

http://www.lbd.dcc.ufmg.br/colecoes/wvc/2005/008.pdf

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