The issue of copyright protection for 3D models is increasing prominently with the development of information technology.A non-blind watermarking algorithm for 3D mesh models based on mesh segmentation is presented.First

meaningful mesh segmentation on 3D mesh model is conducted using the mesh segmentation algorithm based on shape diameter function.Then

the robust center of gravity for each sub-block is calculated which is used as the center to transform the model to the spherical coordinate system from the Cartesian coordinate system.Finally

watermark sequence is embedded by modulating the distribution of vertex norms for each sub-block.In watermark detection

a non-blind method is used to detect the watermark sequence.Aiming at the problems of inconsistent mesh segmentation and the strong dependence on the patch boundary in current watermarking algorithms based on mesh patching

a mesh segmentation algorithm is introduced in and a block matching process with an original model is added to the register and resample process to ensure the consistency of the mesh segmentation.Furthermore

the distribution of vertex norms for each sub-block is chosen to be the watermark embedding primitive

which can weaken the dependence on the patch boundary.Experimental results show that the proposed algorithm can resist a variety of common attacks including translating

rotating

uniform scaling

noise adding

mesh subdivision

mesh simplification

mesh cropping and their combined attacks.