CHI '86 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Low-cost multi-touch sensing through frustrated total internal reflection
Proceedings of the 18th annual ACM symposium on User interface software and technology
ACM SIGGRAPH 2006 Emerging technologies
Shadow tracking on multi-touch tables
AVI '08 Proceedings of the working conference on Advanced visual interfaces
Natural exploration of 3D models
Proceedings of the 9th ACM SIGCHI Italian Chapter International Conference on Computer-Human Interaction: Facing Complexity
Controlling a planetarium software with a Kinect or in a multi-touch table: a comparison
Proceedings of the Biannual Conference of the Italian Chapter of SIGCHI
A multi-touch notice board fostering social interaction
Proceedings of the Biannual Conference of the Italian Chapter of SIGCHI
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Frustrated Total Internal Reflection (FTIR) is a key technology for the design of multi-touch systems. With respect to other solutions, such as Diffused Illumination (DI) and Diffused Surface Illumination (DSI), FTIR based sensors suffer less from ambient IR noise, and is, thus, more robust to variable lighting conditions. However, FTIR does not provide (or is weak on) some desirable features, such as finger proximity and tracking quick gestures. This paper presents an improvement for FTIR based multi-touch sensing that partly addresses the above issues exploiting the shadows projected on the surface by the hands to improve the quality of the tracking system. The proposed solution exploits natural uncontrolled light to improve the tracking algorithm: it takes advantage of the natural IR noise to aid tracking, thus turning one of the main issues of MT sensors into a useful quality, making it possible to implement pre-contact feedback and enhance tracking precision.