基于DWT域的半脆弱“鸡尾酒水印”算法

随着数字图像技术和网络的发展，数字图像的盗版现象日益猖獗，于是数字水印技术应运而生。半脆弱水印技术主要是解决图像内容认证的问题，一般的半脆弱水印都具有鲁棒性不足的缺点。提出一种新的半脆弱“鸡尾酒”水印算法进行图像认证。从水印嵌入的调制策略入手，在图像中隐藏两种正向和负向互补的数字水印，使得水印在受到攻击时至少有一种能够存活，以提高半脆弱水印的鲁棒性。实验证明，这种水印算法具有较好的鲁棒性，能够经受各类攻击。

DWT Domain Based on Semi-fragile "Cocktail Watermarking" Algorithm

With the digital imaging technology and network development, digital images have become increasingly rampant piracy, digital watermarking technology came into being. Semi-fragile watermarking technique can solve the problem of image content authentication, and in general Semi--fragile watermarking have a lack of robust disadvantage. We provide a new ＂cocktail＂ semi-fragile watermarking algorithm for image authentication. In the image hidden two digital watermarks, the one is negative modulation watermarking, the other is positive modulation watermarking. They are complementary semi--fragile watermarking. Experiments It show can assure at least one watermark have survival in any attract. And it improve the robustness of that this algorithm have good robustness, be able to resist to various of types attacks