A New Image Digital Watermarking Algorithm Based on SVD
Suohai Fan · Jisuanji fangzhen · 2011
In some singular value decomposition-based methods,watermark is embedded in the greatest singular value of image matrix,which enhances the ability to resist attacks of wartemark,but lowers image robustness.In order to improve the robustness of image and watermark,a new adaptive image digital watermarking is proposed,which is based on some special properties of SVD and the satisfactory performance that Arnold scrambling can disperse attacks and HVS would find the best embedding strength.First,the image is blocked and then every block is calculated to get the greatest singular value.After transformed by Arnold,the watermark is embedded in this greatest singular value combined with the watermark embedding strength of the block,which is obtained by HVS.Thus,we got the image with a watermark.Compared with the algorithm proposed by Xiao and Wang,the experimental results demonstrate that this algorithm improves the image quality and watermark robustness in a certain extent,which is a more effective algorithm.