Patent ID: 6456336
Filing Date: 2002-09-24
Classification: H04N

Abstract:
A signal generator comprisinga first ramp generator which produces a video ramp signal R1 for each pixel of a predetermined set of pixels h where h=0 to n of each of a predetermined set of video lines v where v=0 to m, of a picture, wherein R1=A1h+B1v+C1â€ƒwhere A1, B1, and C1 are coefficients, a second ramp generator which produces a video ramp signal R2 for each pixel of a predetermined set of pixels h where h=0 to n of each of a predetermined set of video lines v where v=0 to m of the picture, wherein R2=A2h+B2v+C2â€ƒwhere A2, B2, and C2 are coefficients, means defining an angle of rotation, means for varying A2 and B2 in accordance with the change in the angle of rotation, and ramp combining means including NAM means for non-additively mixing the first and second ramps.