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Proceedings Paper

Optical touch sensing: practical bounds for design and performance
Author(s): Alexander Bläßle; Bebart Janbek; Lifeng Liu; Kanna Nakamura; Kimberly Nolan; Victor Paraschiv
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Paper Abstract

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.

Paper Details

Date Published: 14 February 2013
PDF: 15 pages
Proc. SPIE 8657, Computational Imaging XI, 86570O (14 February 2013); doi: 10.1117/12.2005221
Show Author Affiliations
Alexander Bläßle, Univ. of British Columbia Okanagan (Canada)
Bebart Janbek, Simon Fraser Univ. (Canada)
Lifeng Liu, Univ. of Pittsburgh (United States)
Kanna Nakamura, Univ. of Maryland, College Park (United States)
Kimberly Nolan, Drexel Univ. (United States)
Victor Paraschiv, Univ. of Victoria (Canada)

Published in SPIE Proceedings Vol. 8657:
Computational Imaging XI
Charles A. Bouman; Ilya Pollak; Patrick J. Wolfe, Editor(s)

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