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We describe a computer vision based system that allows use of movements of the mouth for human-computer interaction (HCI). The lower region of the face is tracked by locating and tracking the position of the nostrils. The location of the nostrils determines a sub-region of the image from which the cavity of the open mouth may be segmented. Shape features of the open mouth can then be used for continuous real-time data input, for human-computer interaction. Several applications of the head-tracking mouth controller are described.

Kissing, as a barometer of erotic feelings, is an important means of conveying emotions, attitudes, and desires—and their intensity. Although the fundamental manner in which people kiss is culturally determined, kissing is a complex and important form of communication, and the specific techniques employed are motivated by, and illustrative of, the attitudes, feelings, preferences, and derived satisfactions of the people involved.