基于网格细分和边界自适应的三维模型可见水印

Visible Watermarking for 3D Models Based on Boundary Adaptation and Mesh Subdivision

数字水印技术可以有效保护数字产品的版权,而可见水印以水印信息为观察者所见,达到标识版权、保护数据的目的.对三维网格模型的不可见水印已有了广泛研究,但对可见水印的研究甚少.为此,提出一种建立在三维网格模型上的边界自适应可见水印算法.该算法使用Windows系统下的TTF字符库,直接输入需要嵌入的水印信息,包括汉字、英文字符、数字,通过将三维网格模型的平滑区域投影至二维平面进行预细分,以实现可见水印的嵌入.实验表明,该方法可在三维网格模型上较好地显示出汉字、英文字符及数字,边界平滑且具有鲁棒性,起到了用可见水印标识版权的作用.

Digital watermarking can protect copyrights of digital products,while visible watermarking allows immediate perception so that copyright is openly declared.For threedimensional mesh models,extensive studies on invisible watermarking have been done,but few consider using visible watermarking to achieve direct identification of copyright.This paper proposes a visible watermarking algorithm using a 3D mesh model,which is based on boundary adaptation and grid refining of the 3D mesh model.The algorithm uses a TTF character library in the Windows operating system.It can directly input watermarking information including Chinese characters,English letters,and numbers for embedding.A smooth 3D mesh model is projected to a 2D plane,and then the mesh is broken down to embed the visible watermark.Experiments verify that Chinese characters,English letters and numbers can be shown with smooth edges,and they are robust.Thus copyright of the3 D model is protected.