Tangible bits: towards seamless interfaces between people, bits and atoms
Proceedings of the ACM SIGCHI Conference on Human factors in computing systems
PlayAnywhere: a compact interactive tabletop projection-vision system
Proceedings of the 18th annual ACM symposium on User interface software and technology
Low-cost multi-touch sensing through frustrated total internal reflection
Proceedings of the 18th annual ACM symposium on User interface software and technology
reacTIVision: a computer-vision framework for table-based tangible interaction
Proceedings of the 1st international conference on Tangible and embedded interaction
Shadow tracking on multi-touch tables
AVI '08 Proceedings of the working conference on Advanced visual interfaces
Inverted FTIR: easy multitouch sensing for flatscreens
Proceedings of the ACM International Conference on Interactive Tabletops and Surfaces
ZeroTouch: an optical multi-touch and free-air interaction architecture
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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Many types of tangible interaction systems, such as interactive surfaces and gesture-based interfaces, are based on various kinds of optical tracking, using infrared illuminators and cameras. One drawback of these setups is that they suffer from problems common to optical trackers, such as sensitivity to stray environment light from artificial and natural sources. In this paper, we present a method to significantly enhance tracking robustness for those systems which employ active illumination. Through addition of a small electronic circuit which modulates the LEDs used to illuminate the scene, contrast can be significantly increased.