Compared with traditional triangle meshes

point models are suitable to represent irregular objects with complex geometry However

there are few digital watermarks algorithm based on point models In order to protect effectively 3D point model

a new method for digital watermarking of a 3D model defined as a set of un-oriented points based on geometrical property is proposed in this paper Our approach is to modify the distance between each point and the center of the model after principle component analysis according to the watermarking bits At last

embed watermarking by shifting the mean value of the distance distribution. Mesh pre-processing doesn’t need before watermarking is embedded into the point model in the algorithm. In addition

geometrical distortion degree between the original and the tested model is analyzed

and two parameters of watermark strength factor and the size of bin that affect the robustness of the proposed methods are discussed. After conducting the affine transformation and vertex reordering attacks

the original model is not needed during the watermarking extraction Experiments show that this approach is greatly robust against attacks

such as affine transformation

resorting

simplification

cropping

nosing and various distortion ones with local geometric alterations.