Turning invisible..
With their Mouseless prototype, a user's hand movements are tracked with a line-capped Infrared laser beam and an Infrared camera. The beam's plane is aimed just above the surface of the user area and when the user cups the hand, as if holding a physical mouse, this breaks the beam at the points where each finger touches the surface The camera then registers and interprets the changing field shapes and translates them into movement or action, such as clicking and double-clicking.
The developers are continuing to improve the tracking and recognition algorithms to build up a library of commands, possibly leading to multi-touch gesturing in addition to simple click confirmation.
The prototype system is said to have cost just US$20 to put together and can be seen in action in the following demonstration:
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