基于DCT域边缘检测的水印算法

摘要

针对水印提取时的失真和安全性问题,提出一种基于DCT域边缘检测的数字水印算法.该算法用密钥序列置乱水印图像加密,把载体图像分块,根据边缘检测算子得到原始图像的边缘图像,用两种不同的嵌入方法将水印信息根据不同的嵌入强度嵌入到原始载体图像的DC(直流)分量中.实验结果表明,该算法对缩放、压缩、裁剪等攻击具有良好的鲁棒性和不可见性.%A watermark algorithm based on discrete cosine transform (DCT) domain edge detection is proposed according to the watermark extraction of distortion and safety problems.Firstly,key sequence scrambling watermark image encryption is used,and then the carrier image is blocked off,according to the edge detection operator to get the edge image of original image.At last,watermark information according to the different embedding strength is embedded into the carrier image DC component with two different embedding ways.The experiments show that the algorithm has good robustness and invisibility to attacks such as compression,cropping and scaling.