It is an Eigenface based Facial Expression recognition system. The idea of eigenface was first proposed by Turk and Pentland. Implementation details can be found in http://www.cs.ucsb.edu/%7Emturk/Papers/mturk-CVPR91.pdf
Iftekhar Tanveer (2021). Eigenface based Facial Expression Classification (https://www.mathworks.com/matlabcentral/fileexchange/33325-eigenface-based-facial-expression-classification), MATLAB Central File Exchange. Retrieved .
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