Most of the singular value decomposition (SVD) domain watermarking algorithms have been proposed to embed the watermark on all or part of singular values. However, few watermarking algorithms embed the watermark on the orthogonal matrix obtained by singular value decomposition. In this invention, a robust zero watermarking algorithm based on singular value decomposition orthogonal square matrix is proposed by using the relation between the U matrix and the variance of the square of the elements of the first column of the V matrix. The image is divided into non overlapping blocks, for each block of singular value decomposition, the zero watermark sequence was produced by the size of the relationship between variance estimation variance of V and the first column square matrix elements of each sub block U matrix elements of the first column of the square. The invention tests robustness against resampling, smoothing, addition noise, and JPEG compression attacks. The experimental results show that the present method exhibits strong robustness in the above attacks, thus achieving the purpose of copyright protection.
【技术实现步骤摘要】
本专利技术涉及信息安全领域。本专利技术设计一种基于奇异值分解正交方阵的鲁棒零水 印算法，对数字图像进行版权保护。
技术介绍
最近二十年来，计算机技术、通信技术、互联网技术日新月异，发展迅速。这些技术 的发展使得多媒体在网络上的交流越来越频繁，越来越快捷。随之而来的是，多媒体容易遭 到篡改或非法复制等，从而带来版权纠纷等问题。数字水印技术被提出来用于对多媒体进 行版权保护。数字水印技术将具有特定意义的标记(水印)，利用数字嵌入的方法隐藏在多 媒体中，但不影响其价值和使用，用以证明创作者对多媒体的所有权，并作为鉴定、起诉非 法侵权的证据，成为知识产权保护和多媒体防伪的有效手段。根据水印嵌入域进行分类，数字水印算法可以分为空域数字水印算法和变换域数 字水印算法。变换域水印算法嵌入的水印能量可以分布到空域的所有像素，而且可以方便 地与人类视觉特性结合在一起，从而往往具有较好的抗攻击鲁棒性。常用的变换域有离散 傅里叶变换(Discreet Fourier Transformation, DFT)、离散余弦变换(Discreet Cosine Transformation,...
【技术保护点】
１．一种基于奇异值分解正交方阵的鲁棒零水印算法，对数字图像进行版权保护，包括以下两个过程：Ａ、零水印产生过程；Ｂ、零水印提取过程。
【技术特征摘要】
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