Curved color separation spaces for blue screen matting

This paper proposes a new blue screen matting digital solution, which emplo ys "curved separating surfaces" in RGB colorspace, The "separating surface" model was examined by Jim Blinn and Alvy Ray Smith at the 1996 Siggraph co nference and is the recognized model employed irt two of the most common ma tting products used by the industry today, With this paper, we extend the c oncept from the earlier model, which was defined with coarse polygons, to c urved surfaces that maintain a more natural pixel distribution of the foreg round data against the background screen. A constrained grid surface patch (referred to as OGP) is introduced, which achieves a fast, practical comput ing solution for natural matte generation and background suppression. An ad ditional solution called the extended matting problem is also presented tha t uses two additional curved separating surfaces for background spilt remov al.