WSEAS Transactions on Mathematics
Print ISSN: 1109-2769, E-ISSN: 2224-2880
Volume 18, 2019
Locating Laser Sensors for Projector Touch Screens using Trigonometric Methods
Author:
Abstract: An interactive whiteboard can either be a standalone computer with touchscreen or a large functioning touchpad for computer display. Interactive whiteboard systems with laser optic modules can overcome the high cost, low resolution, and low scalability of large touchscreens. Recently, a trigonometric method to find the positions of laser optic modules has been suggested to install the whiteboard system with the laser optic module. The method calculates the geometrical positions of laser optic modules using the sensed angle values of the three touched points on a whiteboard display. Three patterns of touched points are used and trigonometric expressions are derived for each pattern. This paper derived trigonometric expressions that generalize the expressions for three different patterns. Using the derived expressions, we showed that the expression set for each pattern is a special case of the generalized trigonometric expression set.
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Pages: 147-152
WSEAS Transactions on Mathematics, ISSN / E-ISSN: 1109-2769 / 2224-2880, Volume 18, 2019, Art. #21