14 February 2013 Optical touch sensing: practical bounds for design and performance
Author Affiliations +
Touch sensitive screens are used in many applications ranging in size from smartphones and tablets to display walls and collaborative surfaces. In this study, we consider optical touch sensing, a technology best suited for large-scale touch surfaces. Optical touch sensing utilizes cameras and light sources placed along the edge of the display. Within this framework, we first find a sufficient number of cameras necessary for identifying a convex polygon touching the screen, using a continuous light source on the boundary of a circular domain. We then find the number of cameras necessary to distinguish between two circular objects in a circular or rectangular domain. Finally, we use Matlab to simulate the polygonal mesh formed from distributing cameras and light sources on a circular domain. Using this, we compute the number of polygons in the mesh and the maximum polygon area to give us information about the accuracy of the configuration. We close with summary and conclusions, and pointers to possible future research directions.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexander Bläßle, Alexander Bläßle, Bebart Janbek, Bebart Janbek, Lifeng Liu, Lifeng Liu, Kanna Nakamura, Kanna Nakamura, Kimberly Nolan, Kimberly Nolan, Victor Paraschiv, Victor Paraschiv, } "Optical touch sensing: practical bounds for design and performance", Proc. SPIE 8657, Computational Imaging XI, 86570O (14 February 2013); doi: 10.1117/12.2005221; https://doi.org/10.1117/12.2005221


Structure analysis for plane geometry figures
Proceedings of SPIE (March 23 2014)
Scanpath-based model for visual tracking of telerobots
Proceedings of SPIE (June 01 2000)
Supervised color constancy for machine vision
Proceedings of SPIE (May 31 1991)
The experience of GPU calculations at Lunarc
Proceedings of SPIE (November 10 2011)
New application of infrared CCD camera
Proceedings of SPIE (August 12 1997)

Back to Top