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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.doi:10.1109/icat.2007.12 dblp:conf/icat/BrandlHHLOOSB07 fatcat:7hbeyiasbvdtjhbidwj5262ave