基于特征点的自适应三维网格数字水印算法

针对目前三维模型水印算法在将水印嵌入三维模型后,均会使三维模型产生局部失真问题,文章提出一种自适应三维网格水印算法。通过特征点提取算法将模型的特征点提取出来,按其模长进行分组,将每组顶点的模长序列进行一维DCT变换到频域,在频域信号上加入水印,使嵌入的水印具有不可见性。实验结果表明,该算法对仿射攻击、网格简化、加噪声和剪切攻击以及它们的联合攻击具有较好的鲁棒性,同时有效地控制了由于嵌入水印对几何模型造成的局部失真现象。

Adaptive watermarking scheme of 3D polygonal meshes based on feature points

Aiming at the problem that the 3D model is always accompanied by partial distortion after the watermark is embedded by current 3D model watermarking schemes,an adaptive watermarking scheme of 3D polygonal meshes is put forward based on feature points in this paper.Using the feature points selection algorithm,the feature points are obtained and grouped into different sections according to their modular length.Then the real number sequence of the sections is transformed to a signal in frequencv domain using one-dimensional discrete cosine transform.A watermark is embedded into the signal in the frequency domain,and the embedded watermarking is imperceptible.Experimental resuits show the proposed algorithm can effectively reduce the partial distortion extent,and at the same time.it is not only robust to affine attack,but it is also robust to common mesh attacks such as mesh simplification,mesh cropping,random noise added,and combined attacks.