Blind Watermarking Algorithm Based On 3 Dimensional Model Embedded Gray Image

With the rapid development of network multimedia,the research of security technology that based on information-hiding and digital watermarking has become the hot spot now.3D information is standing a more and more position in all modern multimedia information.But the maturity of copyright protection method of 3D information is far away from the maturity of copyright protection method 2D picture, audio and text.Now the research about 3D watermarking is very few,there are still a series of problem which need be researched deeply,for example,how to develop the application range for confronting more species of Attacking,and it's a research direction that how to embed watermarking in 3D model.For solving these problem, based on the research of 2D watermarking and main 3D watermarking algorithm,this article develops a kind of 3D watermarking algorithm based on 3D model for confronting more species of Attacking,at the same tine,the main work of this article is researching and designing a gray blind watermarking algorithm that based on 3D model,at the same time,complete relevant simulation and realization.The main work of this article is as the following.(1) Based on the research of existing 3D watermarking algorithm,develop a kind of 3D watermarking algorithm based on 3D model,theoretical and experimental prove that this algorithm has very well robust when it faces the attacking of shortcutting and shearing,the application range of this algorithm is more large than the origin algorithm.(2) Now the research about 3D blind watermarking is very few,at the same time, blind watermarking is important for the practical of watermarking,this paper puts forward a kind of 2D gray watermarking algorithm based on 3D model,and the experimental proves that this algorithm is feasibility and validity.(3) To improve the security of this watermarking algorithm,this article exploits a kind of random number scrambling algorithm,and the experimental prove that this scrambling algorithm can improve the robust and the security of the 3D watermarking algorithm.(4) Expanding 3D format file.x,which make the index value of 3D picture is one-to-one correspondence with the gray value of the 3D picture,this operation makes this algorithm can change the gray value of 3D picture by operating the index value of 3D picture,which makes this algorithm can embed 2D watermarking in 3D model.(5) In this paper,according to the characteristics of the changing under the attacking of rotation and translation,shortcutting and shearing.Put forward two kinds of ways to extracted watermarking,when the coordinates isn't changed in the process of attacking,this article use coordinate matching,and when the relative coordinates isn't changed in the process of attacking,this article use sphere coordinate matching. The experimental prove that this algorithm has very well robust when it faced the attacking of rotation and translation,shortcutting and shearing.