Last friday (06-10-2017) we started building frames for a proper test setup to enable easier and less time-consuming calibration of the Tobii eye tracking device for different test subjects with, for example, varying heights.
The first object we build for this purpose was a frame to hold the scanning object, the painting. This frame is supposed to look like a large easel. A foam board, passe-partout like construction around the actual painting functions as a proper projection surface to project the calibration grid on. The thickness of the foam ensures that the painting stays at the same level as the projected calibration grid which makes the tracking process even more precise.