Webcam Based Laser Tracking for Human-Computer Interaction

Coding4Fun : Webcam Based Laser Tracking for Human-Computer Interaction: "In this article, we will put together a program which will allow us to move the mouse cursor on our computers with a laser pointer, and even generate mouse clicks using only a webcam for computer vision. One really cool use of this would be with a projector. With a projector, you could use this application and turn its projected image into an interactive screen, and even open files/menus by just pointing at them with a laser pointer!"