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"Augmentative and alternative communication (AAC) systems can be described as methods which endeavour to provide enhanced communication possibilities. AAC aims to provide access to technology for those without the fine motor control necessary to drive the "standard" interfaces such as keyboard and mouse. A non-contact video based method of AAC has been developed. This includes the automatic location of important physical features on the face of the user, such as the eyes and mouth. These features can then be tracked from frame to frame and transformed into 2-D co-ordinates and echoed to the user application screen as the mouse cursor" (http://www.stakes.fi/tidecong/663clarke.htm).

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