三维网格模型数字水印技术为近年来多媒体信息安全领域的的一个研究热点。本文设计实现了一个基于数字水印技术的三维网格模型库版权保护系统，用户在下载使用模型前，模型的版权信息、下载日期、用户编号、模型编号等信息将作为数字水印添加到模型中，日后怀疑侵权行为时，可提取隐藏在模型中的水印信息作为维权证据。水印的嵌入算法通过修改模型顶点球面坐标半径值进行，水印提取时无需原始模型的参与。实验结果表明，系统嵌入的水印具有良好的不可见性，可有效的保护三维模型所有者的版权。%Digital watermarking technology of 3D mesh models is a hot research topic of multimedia information security field in recent years. This article designs and implements a copyright protection of 3D mesh models library system based on digital watermarking tech- nology. Before users download models, Model copyright information, download date, user ID, model ID and other information will be added to the model as digital watermarks. When Suspecting infringement in the future, Copyright owners can extract hidden watermark information as the rights of the evidence. The watermark embedding algorithm is executed by modifying the value of the model vertex spherical coordinates radius, and extraction algorithms didn't need origin models. The experimental results show that the embedded wa- termark has good transparency,can effectively protect the copyright of the owners of 3D models.
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