We demonstrate a proof of concept of touch-based user input using webcams and projectors by creating a whiteboard application that allows the user to draw onto a projector screen directly and see the drawing in real time.

Two webcams track the user's pointer finger as well as proximity to the wall, which is then used to determine location of contact with the wall. The projector displays a calibration pattern which is read by the webcams, allowing for the finger's location to be mapped to the projector screen.

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