1Van Schyndel R.G.,Tirkel A.Z.,Osbrne C.F.A Digital Watermark[J].Proc.IEEE International Conference on Image Processing,Austin,Texas,USA,1994,vol.2,pp:86-90
2Wolfgang R.B.and Delp E.J.A Watermark for Digital Images[J].Proc.IEEE Int.Conference on Image Processing,Lausanne,Switzerland,1996,vol.3,pp:219-222
