“Continuous reference images for FTIR touch sensing” by Alexa, Bollensdorff, Bressler, Elstner, Hahne, et al. …
Conference:
Type(s):
Title:
- Continuous reference images for FTIR touch sensing
Presenter(s)/Author(s):
Abstract:
Touch sensing based on the effect of frustrated total internal reflection (FTIR) can be used to build low-cost, multi-touch capable projection surfaces [Han 2005]. An acrylic panel is illuminated inside. The refractive index of acrylic relative to air leads to total internal reflection within the panel, similar to optical fibers. If an object comes close enough to the surface the total reflection is frustrated, light dissipates, and the object is illuminated. Thus, a fingertip touching the panel will be illuminated. The resulting blob on the panel can be captured and tracked with a camera.
References:
1. Han, J. Y. 2005. Low-cost multi-touch sensing through frustrated total internal reflection. In Proceedings of the 18th annual ACM symposium on User interface software and technology, ACM Press, 115–118.
