VISIBLE-INVISIBLE BACKGROUND PROMPTER

摘要

A video signal is generated representative of a background scene, such as a weather map, which provides an outline of all the detail in the map. This outline detail is made visible to a foreground subject (2) by projecting it onto a white screen (1) behind the subject in a selected color such as green. The projector (3) is selectively inhibited so as to prevent the background detail from projecting onto the foreground subject. The white screen and the green detail lines are removed and replaced by the background scene by an image compositing process. Prompts are visible to the foreground subject, but not visible to a home viewing audience.