Robust dual-watermarking algorithm based on Contourlet and SVD
基于Contourlet和SVD的鲁棒双水印算法

This paper presented a robust watermarking algorithm based on Contourlet transform and SVD. By the advantages of Contourlet transform and SVD, it selected the low frequency subband and the high frequency subband which has the maximum energy as the embedding positions to embed the watermarking information respectively. By comparing the two extracted watermarking images, it chose the one which had larger NC value as the final watermarking. The experimental results show that the algorithm has strong robustness to conventional attacks, as well as geometric-attacks.