用双混沌映射实现的数字水印算法

论文将原始彩色图像转换成灰度图像,通过密钥和非线性映射产生两个独立的实值序列,再从中派生出两个二值序列,先用两个实值序列置乱和加密二值水印图像,然后用派生的两个二值序列把被加密的水印图像嵌入到灰度图像中,实现数字水印。实验结果表明,这种数字水印鲁棒性强,隐蔽性好,具有一定的抗剪切和抗有损压缩攻击的能力。

Digital Watermarking Algorithm Based on Double Chaos Map

After translating the original color image into gray image,and double chaotic sequences are created by two group chaos map with different parameters,in which two group independent actual value sequences are composed by the law of nonlinear,then two binary chaotic sequence generated by the two actual value sequences.Firstly,the binary water-mark image is disarranged and encrypted by the two actual value sequence,secondly,the encrypted watermark image is embedded into the translated gray image by the two binary chaotic sequence,finally,translating the gray image that contain encrypted watermark image is translated into the color image.This digital watermark has such features as good robustness,passive features,anti-splitting ability and anti-losing image compression ability and is easy to realize.