2Schyndel R G van, Tirkel A Z, Osborne C F. A digitalwatermark [A]. In: IEEE Proceedings of International Conference on Image Processing [C]. Austin, Texas: IEEE Press, 1994. 86--90.
3Katzenbeisser S, Petitcolas F A P. Information HidingTechniques for Steganography and Digital Watermarking [M].Beijing: People's Posts & Telecommunications Publishing House, 2001(in Chinese).
4Ohbuchi R, Masuda H. Managing CAD dam as s multimedia data type using digital watermarking [A]. In: Proceedings ofthe 4th IFIP WG 5.2 Workshop on Knowledge Intensive CAD[C]. Parma, Italy: Kluwer, 2000. 103--116.
5Ohbuchi R, Masuda H, Aono N. Watermarking three-dimensional polygonal models [A]. In: Proceedings of ACM Multimedia 97 [C]. New York: ACM Press, 1997. 261--272.
6Praun E, Hoppe H, Finkelstein A. Robust mesh watermarking[A]. In: Computer Graphics Proceedings, Annual Conference Series, ACM SIGGRAPH, New York, 1999. 49--56.
7Ohbuchi R, Masuda H, Aono N. Embedding data in 3D models[A]. In: Steinmetz R, ed. Lecture Notes in Computer Science1309 [C]. Heidelberg: Springer-Verlag, 1997. 1--10.