A watermarking scheme based on digital images´ signatures

In this paper, an effective scheme to resist copy attack based on digital images´ signatures is proposed. In the DCT domain, the digital images´ signature is obtained by use of ICA. Then imbed both the digital signature and a watermark into the image. The embedded digital signature can test whether the digital signature is copied illegally or not. The experiment results show that the digital signatures algorithm have the universality of resisting copy attack.