Multi-Touch Calibration Device
Aligning the detected touches with the projected screen requires the use of a calibration application built into Touchlib. Creating precise touches is made easier using the calibration tool we developed. Since there can be variations in the illumination behind (or under) the projection screen, it’s easier to turn off the illuminators and use an infra red laser to create the touches.
We used two lasers: one visible (to aim at the desired point), and one infra red (which the IR cameras can see) which is triggered by a push button. The body of the device was designed in SolidWorks and built as a rapid prototype using sterolithography (SLA). The electronics were developed and built in-house.