5Voyatzis G,Pitas I. The use of watermarks in the protection of digital multimedia products[ J] . Proc of the IEEE, 1999,87(7) :1197 -1207.
6van Schyndel H G’Tirkel A Z,Osborne C F. A digital watermark[ C] //Image Processing, Proceedings Texas:IEEE Inter-national Conference,1994,2:86 -90.
7Lu Zheming,Wu Haotian,Xu Dianguo,et al. A multipurpose image watermarking method for copyright notification and pro-tection [J]. IEICE Transactions on Information and Systems,2003 ,E86-D (9) : 1931 - 1933.
8Hsieh M S,Tseng D C,Huang Y H. Hiding digital watermarks using multiresolution wavelet tansform[ J] . IEEE Transac-tions on Industrial Electronics,2001 ,48(5) : 875 -882.
9Bhatnagar G,Haman B. A new robust reference watermarking scheme based on DWT - SVD[ J] . Computer Standards andInterfaces,2009,31 (5) : 1002 - 1013.
