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Fraunhofer points you in the right direction
Much hand-waving and gesturing can be seen at Fraunhofer’s booth today as its “Free 2C kiosk” invites you to move a projected 3D object with your finger, without touching the screen.
How does it work? Two cameras at eye-level detect the position of your eyes in order to project the correct 3D image from your viewpoint. A row of LEDs at the base of the screen illuminates your hand with infrared light. This light is reflected back down to two infrared cameras, which open and close at the same frequency as the LED pulses. This information is fed into a computer, which determines the exact position of your hand and updates the display accordingly.
Future systems from Fraunhofer will allow you to use two fingers to expand/ reduce the size of an image or rotate it. So watch this space for even more frantic gesturing!
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