基于DWT域的多通道彩色图像盲水印算法

提出了一种基于DWT域多通道彩色图像盲水印算法。由Logistic混沌映射和Chebychev混沌映射生成四进制复合混沌序列对水印进行加密，Arnold变换置乱水印信息以提高水印的安全性；彩色图像的RGB通道变换成小波域，对RGB通道的低频小波系数分块计算奇异值嵌入不同方向的水印；提取水印采用了图像融合技术。实验结果表明，该算法不可见性好、鲁棒性强，能有效地抵抗常见的水印攻击。

Multi-Channel Color Image Blind Watermarking Algorithm Based on DWT

We proposed multi-channel color image blind watermarking algorithm based on DWT. Watermarking pixel value was encrypted by quaternary composite chaotic sequences made by logistic chaotic mapping and Chebychev Chaotic mapping. Pixel position was scrambled by Arnold transformation in order to enhance watermarking securi ty. The RGB-channel of color image was transformed into wavelet field. The different direction watermarking was embedded the singular value counted by the low frequency wavelet coefficient block of the RGB channels. The image fusion technology was adopted to extract the watermarking. The experiment results showed that the algorithm had good invisibility and strong robust and could effectively resisted on the common watermarking attack.