Turning an Ordinary Rotating Metal Disk into a Unique Interactive Exhibit

15 A key innovation of the 3602 system [1] is the fact that both the metal disk and the secondary projection surface do not integrate any technological element. This is achieved by a computer vision system that employs a depth camera that is hidden above the installation. Using the depth images, the system estimates the disk’s orientation, and detects and localizes fingertip contact with the disk [2]. This information is employed for supporting user interaction, but also for appropriately warping the projected visual content so that it appears undistorted on the disk’s surface. The 3602 system was developed in the context of the “Ambient Intelligence Programme” of the Institute of Computer Science of the Foundation for Research and Technology – Hellas (FORTH-ICS).