Research on human-computer interaction with laser-pen in projection display

In this paper, we present a system which uses laser pen for human-computer interaction in the projection display system. The system adds two additional hardware devices to original projection display system: camera and laser pen with functions of mouse buttons. The laser point on the projection screen is captured by the camera and its location is computed by coordinate conversion. The movement of cursor is controlled by the projection points of laser pen; the functioning keys of the mouse can be simulated by the functioning keys of the laser pen. Users can control the object on the projection screen by the laser pen just like normal mouse.