基于离散余弦变换的数字水印嵌入技术 摘要 随着计算机及网络技术的飞速发展,数字作品传播和拷贝变得越来越方便,同时使得数字作品的信息安全保护和版权保护也成为迫切需要解决的实际问题。数字水印是近年来在信息安全领域兴起的保护知识产权的新方法。它通过在原始数据中嵌入一些重要信息为受到版权保护的媒体数据的完整性和所有权归属提供完全和可靠的证据,以此达到防止数字产品的盗版和篡改目的。 论文主要研究和总结了基于Arnold变换的数字图像置乱技术、基于幻方的数字图像置乱 技术等算法原理,分析了数字水印嵌入的各种算法。利用一种基于离散余弦变换的水印算法通过MATLAB软件来实现了水印的嵌入和提取,最后将得出的试验结果进行性能测试,测试结果表明该算法具有良好的不可见性和鲁棒性。 关键字:数字水印,置乱技术,离散余弦变换,图像处理 Digital Watermarking Embedding Technology Based on DCT ABSTRACT Along with puter work technology rapid development, and dissemination of digital works have e increasingly easy to copy, simultaneously allow digital works to protect the security of information and copyright protection has e an urgent need to address the real issues. In recent years, digital watermarking is in the field of information security emerging intellectual property protection method. It passed in the original data embedded in some important information protected by copyright for the data integrity of media ownership and attribution mention plete and reliable evidence, thereby to prevent the piracy of digital products and tampering with purpose. And major research papers based on Arnold summed up the transformation of the digital image scrambling technology, based on the fantasy side of the digital image scrambling technology and algorithm theory, analysis of the digital watermark embedded in the various algorithms. Based on the use of a discrete cosine transform the watermark by MA
