Patent ID: 6538396
Filing Date: 2003-03-25
Classification: H04N

Abstract:
A method for altering RGB signal levels of a foreground subject photographed on a blue stage, so that said subject appears to have been photographed in the illumination environment of a selected background scene, and said RGB signal level alterations are obtained by the following steps:a) adjusting the RGB signal levels of said subject to provide an initial subjective balance of luminance and color between said subject and said selected background, b) storing background RGB signal levels from a selected zone in close proximity to said subject as background RGB reference signal levels, c) comparing in each successive image frame said stored background RGB reference signal levels with current background RGB signal levels in close proximity to said subject, to determine their RGB variance, d) using said RGB variance to automatically alter said subject RGB signal levels in each successive image frame to maintain a subjective balance between said subject and its background as the subject appears to move throughout said background scene.