基于几何特征的自适应三维模型数字水印算法

针对三维三角网格模型提出一种稳健的数字水印算法.首先将三维三角网格模型进行仿射变换,以获得模型的旋转不变性和缩放不变性;然后将各顶点邻域内顶点位置的平均差值作为掩蔽因子确定水印嵌入的强度,使得嵌入的水印具有不可见性.实验结果表明:该算法简单,对几何变换、简化、随机噪声和剪切攻击具有较好的鲁棒性.

A Geometry Property Based Adaptive Watermarking Scheme for 3D Models

A robust 3D model digital watermarking algorithm for triangle meshes is proposed. algorithm firstly, the 3D model is transformed into a new one by an affine transformation, to achi By eve the the invariance property with regard to rotation and scale. Secondly, the masking factor at each vertex based on an estimate of the averaged difference between the positions of connected vertices to the vertex is used for modification of the location of the vertices, and the strength of the watermark signal is adaptive with respect to the local geometry of the model. Experimental results show that the proposed method is not only simple in implementation but also fairly robust against common mesh attacks such as mesh simplification, mesh cropping, random noise added to the vertex coordinates.