iPhone 4 & iPad 2 Head Tracking via Front Camera: It’s 3DTime!

I’m sure most of you have seen Johnny Chung Lee’s Wii head tracking demo. But while Lee had to use a Wiimote and IR diodes (and a PC) for his hack, Jeremie Francone and Laurence Nigay of the Grenoble Informatics Laboratory were able to pull off the same trick on the iPhone 4 and the iPad 2 using only the front-facing cameras on the devices.