A laser spot bounces on a figure being drawn on paper, trying to escape the labyrinth of lines. There is no camera nor projector; this is an experience where the audience can touch and interact with a beam of pure light – and even play a pong game with bare hands. The quality of the laser light, and the fluidity of the motion makes for a very unique experience.
The problem of tracking hands and fingers on natural scenes has received much attention using passive acquisition vision systems and computationally intense image processing. We are currently studying a simple active tracking system using a laser diode (visible or invisible light), steering mirrors, and a single non-imaging photodetector. The system is capable of acquiring three dimensional coordinates in real time without the need of any image processing at all. Essentially, it is a smart rangefinder scanner that instead of continuously scanning over the full field of view, restricts its scanning are to a very narrow window precisely the size of the target.
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