To improve the robustness of transform domain watermarking and solve the limits of the grid shape in multi-resolution wavelet transform

a transform domain-watermarking scheme of 3D models based on local feature points is presented in this paper. 3D models are partitioned through longitude and latitude angles to get the local feature points. Two-dimensional matrices are composed by the ratio of the length of the local feature points and the other points in this region. The discrete wavelet transform is carried out on the two dimensional matrix modifying the wavelet coefficients of each layer in the intermediate frequency and high frequency coefficients to embed the watermarking. Then

the airspace signal is obtained by the inverse discrete wavelet transform and the length of the local feature points is modified to obtain a 3D watermarked mesh model. The proposed watermarking scheme is robust against attacks such as translation

rotation

uniform scaling

vertex re-ordering

noise

simplification

cropping

subdivision

quantization

combination attacks and so on. The experimental results show that this watermarking scheme has good robustness and imperceptibility. Besides

it has no strict requirement for the shape of the mesh model.