Abstract
INTOI is a rear-projection setup which combines accurate pen tracking with hand gesture recognition. The hardware consists of an Anoto pattern printed on a special rear-projection foil and an infrared tracking system. INTOI is a low-cost system that is scalable and provides highly accurate input (to less than 1mm). Finally, our setup supports a novel multi-user interaction that combines simultaneous interaction of both hand and pen gesture input. © 2007 IEEE.