Analysis and realization of watermaking hiding in color picture
Wang Nai-dan · Journal of Jilin University · 2011
For the watermarking applied in certificate verification,a method that hiding information into pictures in certificate was proposed.Aiming at three main distortions during the process of certificate manufacture,use and verification,the prediction error filter used in L*component of color image's L*a*b*space.A kind of naturally robust watermark pattern is applied to resisting the local and small nonlinear distortion.The bigger geometric distortions are corrected by image registration based on Hausdorff distance.Experimental results show that the proposed method achieves robustness against printing and scanning.