1. Unzign watermark removal software, http://altern.org/watermark/, July 1997.
2. A. Alattar, Smart images using Digimarc's watermarking technology, in: P.W. Wong, E.J. Delp (Eds.), IS&T/SPIE's 12th Annual Symposium, Electronic Imaging 2000: Security and Watermarking of Multimedia Content II, SPIE Proceedings, Vol. 3971, San Jose, CA, USA, 23–28, January 2000.
3. A. Blake, A. Zisserman, The MIT Press, MA, 1987.
4. Globally convergent edge-preserving regularization: an application to limited-angle tomography;Dalaney;IEEE Trans. Image Process.,1998
5. A DCT-domain system for robust image watermarking;Barni;Signal Processing,1998