基于虚拟光学的三维空间数字水印系统

数字水印已成为数字作品版权保护的一种手段。数字水印是一种嵌入到图像、视频或者音频数据中的不可见标志 ,通过对水印信息的检测可以达到保护多媒体数据版权的目的。先前众多的水印算法大部分是基于二维操作的 (如静止图像、视频 )。基于虚拟光学信息隐藏理论提出了一种三维空间的数字水印算法。该数字水印算法能成为一种多媒体数据产权保护的有效方案。对算法的测试结果表明 ,该算法对于噪声叠加、剪切、有损压缩等常见的信号处理操作具有较高的鲁棒性。同时 ,该算法由于引入了虚拟光学信息隐藏思想 ,将虚拟光路的几何结构参量作为密钥 ,设计出了多重“锁”和多重“密钥” ,大大提高了水印系统的密钥空间 ,仿真结果表明该算法具有良好的安全性。

3-D Spatial Digital Watermarking System Based on Virtual Optics

Digital watermarks have been proposed in recent literature as a method for copyright protection of multimedia data. Digital watermark is invisible mark embedded in digital image, video or audio documents, by detecting the information of watermarking to protect copyright of multimedia data. Most published watermarking methods are based on two-dimensional (e.g., image or video) approaches. A new algorithm of digital watermarking in three-dimensional (3-D) space based on the methodology of virtualoptics is presented. The watermarking algorithm can offer an effective solution to the issue of copyright protection of multimedia data. Numerical experiments show that the embedded watermark is robust to signal manipulations, such as superposing noise, cropping and lossy compression. Because the concept of virtualoptics is introduced, the proposed scheme has good security. There are large degrees of freedom existed for designing a security lock(s)/key(s), including multiple lock(s)/key(s) and multi-dimensional lock(s)/key(s). Numerical simulation results show a good agreement with theoretical prediction.