communication mediumProceedings of CESCG 2018:
The 22nd Central European Seminar on Computer Graphics
In this paper, we present a novel approach to calibrate a 4-component setup, consisting of a movable object be- neath a static arrangement of a colour camera, a depth camera, and a projector, which was developed as part of a tactile audio guide to help visually impaired people per- ceive images. For the static arrangement, we propose a procedure that allows calibrating all three devices simulta- neously using a single calibration target with two different calibration patterns – one printed and one projected. The application is easy to use, due to the mostly automated cal- ibration process and the algorithm still achieves reasonable accuracy for the devices and their respective poses. For the movable object, a point cloud matching algorithm is im- plemented to detect its 3D pose with respect to the three device coordinate systems, when placed beneath the setup. This allows to register interaction gestures to specific areas on the object and to project images onto the object.