Research Of The Digital Geometry Information Hiding Techniques

With the digital media technology and the rapid development of Internet technology, Digitized multimedia data facilitate the distribution and processing of multimedia information and enhance the accuracy and efficiency of information presentation. But, the digitization of data security problem, that is, copyright protection issues have been highlighted by: The illegal distribution of multimedia data and copying very easy, but the quality was not compromised. Use of existing tools and the Internet, people can easily access, copy, operating and release of these digital media. However, this convenience also makes piracy increasingly serious problem, many authors will therefore not figure in his works the way the media release. In recent year, digital watermarking, which is an application of steganography, becomes a hot spot in the research field of multimedia data security, and provides a new train of thought to achieve effective protection of copyright.The current digital watermarking technologies focuses on media data types like text, images, video and audio, the problem of watermarking three-dimensional geometric models has been researched relatively less. However, as more and more three-dimensional data distributed and released in the Internet, Accordingly, copyright owners or companies who sell or present their products in the Internet will face copyright-related problems. They urgently need a new way be able to prevent unauthorized and illegal use of their data material. Digital watermarking technology, this new information means for copyright protection in this area has a broad application prospect.In his paper, we study a class of orthogonal function systems -U systems, V systems and V system Over Triangulated Domains. Both of them are composed by a series of piecewise polynomials of degree k, those kinds of complete orthogonal function systems have characters of smooth orthogonal functions and discontinuous orthogonal functions. Combining digital watermarking technology, these characters can be used in information hiding and digital watermarking of three-dimensional geometric model. Then, a class of digital watermarking algorithms separately based on U system, V system and V system Over Triangulated Domains of three- dimensional geometric model was introduced. These algorithms have some characteristics as follows: high robustness that can be resistance to translation, rotation, uniform scaling and processing noise, such as a certain degree of attack; carrying out with the rapid speed in embedding and extracting watermark; simple and easy implementation. At the same time, a three-dimensional geometric model of signature authentication for the model was proposed. This authentication mode has finer effect in the copyright protection and source validation.