Patent ID: 8063991
Filing Date: 2011-11-22
Classification: H04N

Abstract:
1. A method for reducing the visibility of a signal difference between a blue screen and a garbage matte in the background scene of a composite image when the blue screen signal, Ec, is less than the signal level of an adjoining garbage matte and said visibility reduction does not cause a subject to become semitransparent when closely approaching an edge of the garbage matte; said method comprised of: a) generating a transition region from the edge of said garbage matte joining a blue screen where said transition region extends a predetermined distance over said blue screen, b) identifying a signal level for each pixel forming a contour of said transition region, c) generating a cleanup signal that raises the level of the Ec control signal up to the signal level of each pixel defining said transition region, thereby providing a soft edge transition from the blue screen to the garbage matte edge.