/ Method and Apparatus for Digital Watermark on Rational Bezier Curves and Surfaces

摘要

PURPOSE: A method and an apparatus for digital watermarking of a rational Bezier curve/curved surface are provided to maintain a watermark even if the curve is reparametrized or subdivided. CONSTITUTION: A rational Bezier curve/curved surface data input unit(110) inputs data of a rational Bezier curve or curved surface into which a watermark is to be inserted. A watermark data input unit(120) inputs watermark information. A watermark data storage unit(130) stores the data inputted from the watermark data input unit. An encoding unit(140) encodes the watermark data stored in the watermark data storage unit. A watermark insertion unit(150) inserts the encoded watermark data into a function of a rational Bezier curve inputted to the rational Bezier curve/curved surface data input unit. A storage unit(160) stores the data of the rational Bezier curve into which the watermark data is inserted.