一种彩色QR码嵌入彩色图像的数字水印技术

为了更好地保护数字版权,提出了一种将彩色QR(quick response)码嵌入彩色载体图像的数字 水印算法。算法通过Arnold置乱技术对水印信息进行加密与Contourlet-离散余弦变换和奇 异值分解(Contourlet-DCT-SVD)水印技术完成对水印的嵌 入和提取。通过实验验证,本文算法对JPEG压缩攻击、剪切攻击、高斯噪声和椒盐噪声攻击 具有较强的抵抗 能力,对上述攻击后提取的彩色QR码均能正确识别；对任意旋转攻击后提取出的彩色QR码水 印也具有 较高的识别率,具有较好的不可见性和鲁棒性。

Digital watermarking technique of color image based on color QR code

In order to protect the copyright of digital asset,a digital watermar king technique is proposed where color quick response (QR) code is embedded in colo r image.The watermark is embedded and extracted by contourlet discrete cosine transform singular value di sposition (DCT-SVD) technology,and the watermark is encrypted with Arnold scrambling.Through experimental verification,the algorithm for JPEG com pression attack, cropping attack,Gaussian noise and salt and pepper noise attack has stronger rob ustness.The color QR code can be correctly identified after the attack.The watermark of the color QR code which is extracted from any rotating attack also has a high recognition rate.The watermarking algorithm has good invisibility and robustness,which can be applied to the prot ection of digital copyright.