An adaptive image zero-watermarking algorithm in DT-CWT domain
Gao Shi · Journal of Sichuan University · 2008
A zero-watermarking algorithm based on DT-CWT and SVD is presented.The central idea of this method is: singular values of the two low frequency matrices in DT-CWT are selected adaptively and normalized to construct the zero-watermarking signal.The test threshold analysis is also provided.The experimental results show that this algorithm not only ensures the unity between robustness and imperceptibility,but also has good performance in common intentional or unintentional attacks such as filtering,lossy compression,noising and geometric transform.