Tangible objects on capacitive multi-touch surfaces are usually only detected while the user is touching them. When the user lets go of such a tangible, the system cannot distinguish whether the user just released the tangible, or picked it up and removed it from the surface. In this demo we demonstrate PERCs , persistent capacitive tangibles that "know" whether they are currently on a capacitive touch surface or not. This is achieved by adding a small field sensor to the tangible to detect the touch screen's own, weak electromagnetic touch detection probing signal. In this demo we present two applications that make use of PERC tangibles -- An air hockey like game for two players and a single person arcade game.
['Christian Cherek', 'Simon Voelker', 'Jan Thar', 'Rene Linden', 'Florian Busch', 'Jan O. Borchers']
PERCs Demo: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays