Using a cleansing signal restricted to a region to save a discordance signal level between a blue screen and a mask garbage next

摘要

A method for reducing the visibility of a signal difference between a blue screen (2) and a garbage mask (3) in the background scene of a composite image when the control signal blue screen, Ec, is below the level signal mask adjacent trash, and the reduction of visibility does not make a subject (5) becomes semitransparent when closely approximates the edge of the garbage mask, wherein said mask garbage (3) covers parts of the screen that they are not blue of an image frame (1) plus an overlap within the blue screen (2); compound said process by: a) defining a transition region (9) of said garbage mask (3), wherein said transition region (9) 10 is from the edge of said mask garbage (3) connecting the blue screen (2), wherein said transition region extends a predetermined distance on said blue screen; b) adjusting a level of a cleansing signal in proportion to a level of each pixel defining said transition region, where the transition signal raises the signal Ec control to the level of each pixel defining said transition region, thus providing a gradual transition from the level of the Ec control signal, generated from the blue screen, and the edge of garbage mask, without affecting the rest of the image.