Implementation of 3D Virtual Touch Screen

This study implements a virtual touch screen that keeps track of the location of hand, inputted from the disparity Image being outputted by a time of flight (TOF) camera, using the Kalman filter. Put out from the depth image of the TOF camera, this image is insensitive to light and therefore helps implement a virtual touch screen independent from the surroundings. The biggest problem with conventional virtual touch screens has been that even the slightest change in location led an object to fall out of or enter the virtual touch screen. In other words, the pointing location responded too sensitively to accurately detect the touch point. The Kalman filter, on the other hand, can be a solution to this problem, as it constantly predicts the pointing location and detects this touch point, without interruption, in response to even a slight change in location. This enables a stable and smooth change in the location of pointing point on the virtual touch screen.