摘要
文章首先运用混沌序列对灰度的图像水印进行置乱预处理,置乱后的每个水印图像像素进行位分解后依照系数量化的规则嵌入载体图像的8×8DCT块系数中的8个最低频系数中,同时实现了水印的盲提取。实验结果表明,该算法对JPEG有损压缩、图像剪切等常见的图像处理操作有较强的鲁棒性,具有一定的实用价值。
A chaotic sequence is used to scramble the gray-scale watermark. Each. scrambled watermark pixel is first decomposed to eight bits, and after that, these bits are embedded into the eight lowest DCT frequency coefficients of the cover image. And however, the cover image is not required in the extraction of the watermark, The experiment results indicate that the algorithm is effective and robust to commom image processing operations and some geometric distortions such as JPEG compression and cropping.A conclusion can be made that the proposed algorithm is practical.
出处
《信息安全与通信保密》
2007年第6期215-216,219,共3页
Information Security and Communications Privacy
关键词
混沌置乱
灰度水印
离散余弦变换
盲提取
Chaotic permutation
Gray-scale watermark
DCT
Blind extracting
