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Psychological research for the recognition of emotions from facial expressions have evolved over the years. Recent technological advances in imaging, computing, computer vision, and pattern recognition have paved the way for automating facial expression recognition. The proposed approach in this paper presents our initial expression classification research using Hidden Markov Models (HMM) on 2D texture facial data. A surface curvature based feature extraction technique involving geometric facial data from unique 3D sensors is also being investigated. It is expected that the proposed methodologies could provide significant improvements in facial expression and emotion recognition performance.