2[1]Bnder W, Gruhl D, Morimoto N, et al. Techniques for data hiding[J]. IBM System Journal, 1996,35(3-4):313~335
3[2]Lee Chang-Hsing, Lee Yeuan-Kuen. An adaptive digital image watermarking technique for copyright protection[J]. IEEE Transactions on consumer lectronics,1999,45(4):1005~1015