Researchers at the University of Tokyo have created an advanced motion-tracking camera that is designed to attach to a mobile device like a cell phone.  It allows for “in-air typing” or Project Natal-style gestures to type out text messages or emails by detecting finger movement.  The demo above shows how something like this could replace a physical and touch (virtual) keyboard on mobile devices.

[Via Ishikawa-Komuro Lab; Gizmodo]