基于Logistic混沌映射的DCT域脆弱数字水印算法

本文提出了一种新的混沌脆弱数字水印算法.利用混沌系统对初值的极端敏感性和块不相关水印技术,将图像DCT次高频系数和水印密钥合成为logistic混沌映射初值从而生成水印,再将水印嵌入到图像DCT的高频系数中得到水印图像.利用图像DCT系数之间的关系,实现了水印的盲检测.实验结果表明,该算法可以精确检测到对水印图像的一个像数点的改变,并具有良好的定位篡改能力.

DCT-Domain Fragile Watermarking Algorithm Based on Logistic Maps

A new chaotic fragile watermarking algodthrn is presented. With the high sensitivity on initial value of the chaotic mapping and the block-wise independent technology, the image DCT sub-high coefficients and a watermarking key are combined as the initial value of logistic maps for the generation of the watermarks,then the watermarks are embedded into the DCT high coefficients to get watermarked image. The watermarks can be blindly extracted according to the DCT coefficients. Experimental results show that the algorithm can detect any modification to the watermarked image and localize the tampers on the watermarked image.