Strong Robustness Holographic Watermarking Algorithm Based on DWT-SVD
Zhang Lei-hon · Packaging Engineering · 2013
On the basis of theoretical analysis of holographic watermark and transform domain watermark,a strong robust holographic watermarking algorithm based on DWT-SVD was proposed. The security,robustness,and invisibility of the watermarking algorithm were verified through MATLAB simulation. Embedding watermark in the transform domain of DWT and SVD can ensure invisibility and robustness; the drawback of the existing watermarking algorithm,which is not resistant to rotation,can be overcome by combining with the characteristic of holographic technology and DWT-SVD. Firstly,the watermark was encrypted to get its singular value; singular value of the low frequency coefficient after the second wavelet decomposition was obtained through wavelet decomposition of the B component of RGB image; finally,watermark was embed using weighted method. Simulation result of embedding and extracting watermark is that PSNR 20 dB and NC value closing to 1,indicating that the method is feasible; robustness simulation results showed that the algorithm can resist arbitrary rotation attack and the basic image processing operations attacks.