Algorithm and Implementation of Digital Watermarking Based on Improved SVD
Jianmin Zhao · Jisuanji yingyong yanjiu · 2006
Digital watermarking is a potential technology,which can solve the problem of multimedia copyright protection etc.An algorithm based on SVD is robust against image distortion.But based on SVD,along with the enlarging of its size,more time will be spent in computing the SVs,and experiments show that the distortion in the diagonal direction is conspicuous,due to the calculation error,so we present a watermarking algorithm based on Block-SVD.In this method,the original image is divided into several blocks and we improve on watermark to add distortion compensation.Experimental results show that the watermarking algorithm performs well in robustness.At last the method based on Block-SVD is compared to the traditional Cox method,which also shows that the new method is very robust.