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The authors present the efforts towards a multi-camera mouse-replacement system for computer users with severe motion impairments. They have worked with individuals with cerebral palsy or multiple sclerosis who use a publicly available interface that tracks the user's head movements with a single video camera and translates them into mouse pointer coordinates on the screen. To address the problem that the interface can lose track of the user's facial feature due to occlusion or spastic movements, they started to develop a multi-camera interface.
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