Research On Digital Watermarking Technology For 3D Model

With the development of 3D imaging,computer graphics,iconography and communication technology,artificial or real three-dimensional objects have entered into life,military,technology,industry and other fields in the form of digital products.The application of 3D model has brought great benefits to production and life,but at the same time,it also faces potential threats,such as infringement,piracy,illegal copying,modification and dissemination.How to effectively protect the intellectual property of 3D digital products is a major issue that is currently facing.This paper studies 3D digital watermarking from two aspects,one is a nonblind watermarking and the other is blind watermarking.At the same time,based on the proposed blind watermarking algorithm,the corresponding software system is developed.The work of this article can be summarized as the following three parts.(1)A non-blind watermarking algorithm for three dimensional points cloud model is proposed in this paper.The algorithm carries out the spherical coordinate transformation to the point cloud,and sort the model length matrix regularly,and embeds the watermarking into the low frequency part of the discrete cosine domain.The experimental results show that the algorithm can not only guarantee the transparency of the watermarking,but also have good robustness.(2)A double blind watermarking algorithm for 3D mesh model based on normal features is proposed in this paper.The algorithm combines normal features,and transforms the whole sphere coordinate system to local sphere coordinate transformation of local vertices of the model,and Combined with the transformation domain and statistical idea to achieve the double watermarking embedding.The double watermarking does not interfere with each other,and they can increase the overall robustness of the watermarking.The experimental results show that the algorithm can not only realize the blind detection of double watermarking,to a certain extent,it also has the ability to resist translation,rotation,scaling,shearing,simplification,smoothing,noise,vertex reordering and joint attack.Compared to the same type of algorithm,the types of resistance to attack have increased.(3)Based on the proposed double blind watermarking algorithm,the corresponding 3D digital watermarking embedding and detecting software system is developed.