In order to achieve copyright protection of 3D color point cloud models and effectively improve the robustness of digital watermarking algorithms,a digital watermarking algorithm for 3D?color point cloud models based on redundant discrete wavelet transform andsingular value decomposition is proposed. Firstly, the algorithm performs 3D affine invariant processing on?
the 3D color point cloudmodel. Secondly,the processed 3D color point cloud model is transformed into a 2D color image using a coordinate projection algorithm.Next,the LL sub-band,
the low frequency portion obtained by applying the redundant discrete wavelet transform to the two-dimensionalcolor image,is used as the embedding region of the watermark,and the singular value decomposition is performed on the LL sub-band,inaddition to applying the Arnold transform to transform the binary watermark image into an encrypted watermark image. Finally,the embedding of the encrypted watermarked image is achieved by modifying the correlation coefficients in the matrix U obtained from thesingular value decomposition.?
The watermark extraction is based on the relationship between the magnitude of the correlation coefficientsin the matrix U . Experimental results show that the proposed algorithm is?
robust to attacks such as translation,rotation,uniform scaling,noise,clipping and simplification,which not only effectively improves the robustness of the digital water marking algorithm,?
but alsoachieves the purpose of protecting the copyright of 3D color point cloud models.