METHOD AND APPARATUS FOR INTERACTING WITH A COMPUTER GENERATED PROJECTED IMAGE

Disclosed is a method and apparatus for one or more operators to interact with a computer-controlled image projection-system. An operator-controlled radiation projector projects a beam of radiation which may be visible or invisible on the image created by the computer-controlled image projection system. A position sensing device determines the position of the projected radiation relative to the projected image and provides position information to the computer. In a preferred embodiment, the computer can then generate an additional image at or related to the spot of radiation permitting the operator to draw or paint pictures on the computer-projected image. In an additional preferred embodiment, the use of the position sensing device can be utilized to sense the position of a spot projected by one or more of a multiple gun projector which in a closed loop feedback loop can be used to control alignment of images projected by the multiple gun projector. In a preferred three-gun projector embodiment, the relationship between a spot projected by one or more projectors and its position as determined by two or less position sensors results in accurate alignment in translation, roll and magnification.