Sensing of Feeling and "Kansei". Facial Expression Recognition from Image Sequence Using Hidden Markov Model.

Sakaguchi, T., Ohya, J., & Kishino, F. (1995). Sensing of Feeling and “Kansei”. Facial Expression Recognition from Image Sequence Using Hidden Markov Model. The Journal of the Institute of Television Engineers of Japan, 49(8), 1060–1067. https://doi.org/10.3169/itej1978.49.1060