Abstract: The general three-dimensional grid watermarking algorithm can not take into account the embedding capacity
and transparency,and watermark blind detection is not easy to achieve. Aiming at these problems,this paper presents a blind watermarking algorithm based on feature points. It uses a global three-dimensional model to find the farthest points of global feature points. According to the affine invariance principle,the original carrier is affined to a fixed dome space of the global coordinate system to enhance the robustness. According to the point-intensive,it divides the carrier into some local space. In order to enhance the transparency of the algorithm,it makes the farthest point from the centroid in the local space as the local feature vertexes to establish local geometric coordinates. It achieves blind watermark by using the projection of the
vertex angle defined in the coordinate system to store the watermark indexes. Experimental result shows that the proposed algorithm not only has good robustness and imperceptibility to such as geometric transformation,simplification,random noise and shear attacks,but also has blind watermark detection advantage.