US Patent 7468778 Virtual studio system

A method of providing a visual representation of a scene to a participant in a studio is provided, wherein the studio is arranged to be viewed by a camera to provide a camera image and has at least a portion of a background object arranged to be keyed out of the camera image by a keying process. The method includes obtaining an estimate of the viewpoint of the participant; rendering an image of the scene based on the viewpoint of the participant; and projecting at least a portion of the rendered image onto the background object to provide a projected image portion visible to the participant. The projected image portion is projected so as to be keyed out of the camera image by the keying process.