PiD, a person identification system using voice and face
USA Patent 5,412,738

The strategy used by the described system is essentially based on the comparison, at the pixel level, of selected regions of the face (see the papers Face Recognition: Features versus Templates, R. Brunelli and T. Poggio, and Person Recognition Using Multiple Cues, R. Brunelli and D. Falavigna). A set of regions, respectively encompassing the eyes, nose, and mouth of the user to be identified are compared with the corresponding regions stored in the database for each reference user

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