基于复合加密的自适应DCT域盲检彩色水印算法

提出了一种基于时域和频域(整数小波域)复合加密自适应彩色水印算法,采用Logistic混沌映射和Chebychev混沌映射生成复合混沌序列置换像素的值,Arnold变换置乱像素的位置,并根据离散余弦变换(discrete cosine transform,DCT)系数计算水印嵌入强度因子,设计了彩色水印的嵌入与盲检提取算法。利用Matlab7.0平台验证了该算法,实验结果表明:该算法对常见的水印攻击不仅具有较好的透明性,而且具有较强的鲁棒性。

Adaptive color blind watermarking algorithm based on complex encrypting and DCT transform

A kind of complex encrypting adaptive color blind watermarking algorithm was proposed based on timedomain and frequencydomain(integer wavelets domaion).Pixel value was displaced by logistic chaotic mapping and Chebychev chaotic mapping to creat the complex chaotic sequence.Pixel position was scrambled by Arnold transform.The watermarking embedding intensity factor was counted by the DCT coefficient.A color watermarking embedding and blind extracting algorithm was designed.Algorithm experiments were produced by Matlab7.Experimental results showed that the algorithm had good transparency and strong robustness on the common watermarking attack.