[1] Cox I J,Killian J,Leighton T. Secure spread spectrum watermarking for multimedia[J]. IEEE Transaction on Image Processing,1997,6(12):1673-1687.
[2] Kaewkamnerd N, Rao K R. Wavelet based image adaptive watermarking scheme[J]. Electronics Letters, 2000,36(2):312-313.
[3] Mallat S. A theory of multiresolution signal decomposition the wavelet representation[J]. IEEE Transactions on Pattern Analysis and Machine Intelligent,1989,11(5):647-693.