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Recognition and extracting various emotions and then validating those emotions from the facial expressions has become important for improving the overall human computer interaction. This paper reviews the literature on different aspects like different theories of emotions, methods for studying different images in the databases, different action units like outer brow raisers where the frontals and pars medal's facial muscles are studied. The paper reviews comparative techniques for automaticallydoi:10.5120/9260-3434 fatcat:qaqgmfztmbgx3doougmwxbddem