ThirdHand: A novel and cost-effective HCI for physically handicapped people

In this paper a HCI, namely ThirdHand, has been developed especially for physically handicapped people who can at least rote their heads and lips. This system focuses on the design of a head-operated headset that uses two visual light emitting diodes (LEDs) with different colors and a lips-operated push switch. A webcam attached to the computer captures the light of LEDs and translates them into the movement and clicking operations of the mouse pointer on the screen. One of its most important advantages is its accuracy of the user-friendliness. Another advantage is that it requires bellow $1 to produce the hardware parts - comparatively lower than many HCI devices developed for the same functionality.