Image Watermarking Algorithm Based on Improved Curvature Scale Space Technology
Yubo Tian · Jisuanji gongcheng · 2009
This paper presents a novel robustness algorithm.It uses an improved curvature scale space technology to obtain a few robust corner points to rebuild the image suffered geometric attacks.Two chirp signals as the watermark are selected and embedded into the discrete Fractional Fourier Transform(FRFT) domain of the image.The transform orders and the matrices of the position where the watermark is embedded are used as encryption keys of the algorithm.With the help of the property that a chirp signal can produce a strong impulse in the FRFT domain,the watermark can be detected conveniently.Simulation experimental results show that this algorithm assures good imperceptibility,security and robustness.