一种强鲁棒性的彩色图像数字水印技术

A Color Image Digital Watermarking with Strong Robustness

目的提出了一种彩色图像数字水印技术,解决数字水印在大数据量水印、不可见性和鲁棒性之间的关系。方法该算法对彩色QR码水印和彩色载体图像分别进行RGB三通道分解,彩色水印单通图像进行混沌加密;对彩色载体单通道图像进行Contourlet变换;按对应通道将水印嵌入到载体图像低频经奇异值分解后的对角矩阵。结果该算法在水印嵌入和提取仿真实验结果为PSNR>50 d B;鲁棒性仿真实验结果表明,该算法在抵抗任意旋转攻击和基本图像处理操作的攻击下,提取出来的彩色QR码颜色未失真,并且均能够成功解码和自动识别。结论该算法具有较强的鲁棒性和较好的不可见性,能够很好地将彩色水印嵌入彩色图像,可应用到实际的数字版权保护中。

A color image digital watermarking technique was proposed to solve the relationship among the watermark,invisibility and robustness of digital watermarking. Firstly,the RGB three-channel decomposition was performed on the color QR codes and color images. Secondly,color watermark was treated by chaotic transform and Color image by Contourlet transform. Thirdly,the watermark was embedded into the matrix of the low frequency of the carrier image after singular value decomposition. The simulation result of this algorithm was PSNR50 d B. Experimental results showed that the proposed algorithm was capable of resisting arbitrary rotation and basic image processing operations. The color QR codes extracted could be successfully decoded. The algorithm had strong robustness and good invisibility,and could well embed color watermark into color image. Therefore,it could be used in the actual digital copyright protection.