Copyright protection method for 3D model of geological body based on digital watermarking technology

摘要

In the continuous development of Internet technology and geological information technology, problems such as illegal possession, copying, modification and dissemination of unauthorized digital products have occurred in the field of geological information technology. In the field of geological information technology, not only traditional digital products such as text, image, audio and video are produced, but also 3D model digital products unique to geological information technology, which are geological bodies, geological phenomena, geological structures, geological processes and geology. Regular 3D visualization analysis and the foundation and platform for comprehensive decision making of 3D visualization, the 3D model of geological body plays an increasingly important role in the field of geological information technology. Of course, it also faces the problems faced by traditional digital products and copyright protection. In this paper, the advantages and disadvantages of digital watermarking technology in copyright protection and the characteristics of geological body 3D model itself, and the current mature 3D model digital watermarking algorithm are introduced. The research idea of 3D geological body digital watermarking algorithm based on point cloud model is proposed. According to the spatial characteristics of the point cloud model of geological body, the spatial characteristic variables of the point cloud model are obtained by using the spatial characteristic analysis algorithm. The spatial domain information represented by the spatial characteristic variables is transformed into the frequency domain information, and then the frequency domain information is analyzed by means of mathematical statistics to extract the digital watermarking information of the whole geological body point cloud model. The feasibility of the algorithm is analyzed and verified by the experimental analysis. The digital watermark information before and after the attack is extracted by geometric attacks such as affine transformation and shearing. The extracted digital watermark information is correlated with the coefficient analysis and the robustness of the algorithm is obtained. A better robustness effect can effectively protect the copyright of the owner of the 3D model of the geological body. (C) 2018 Published by Elsevier Inc.