离散余弦变换域图像数字水印技术

基于变换域的水印技术由于其较好的鲁棒性和安全性成为了目前水印技术领域研究的热点.详细地分析了目前离散余弦变换域的图像数字水印技术,对离散余弦变换域的算法进行分类比较,并对拉伸因子a的取值以及对图像水印嵌入效果的影响进行了讨论,提出了一些有效的水印方案,实验结果表明了其对常见攻击的抵抗性.分析和讨论了DCT变换域图像数字水印技术在嵌入水印方面的实现.

Title image digital watermarking based on discrete cosine transform

In recent years,there are much bigger development in the digital watermarking technology,which become research hot spot of the present watermark area of technology based on transformation territory watermark technology because of better robustness and the security.The discrete cosine transform(DCT)which is used in present image watermarking technology area mainly is summarized de- crypted and analyzed,and algorithms are carried on the classified comparison,what is more,the discussion is carried on the value of the scaling parameteras well as its influence on the image.Further,some efficient watermarking schemes are presented,whose robu- stness is discussed.The most important stages of a watermarking algorithm namely watermark embedding are described.