With the rapid development of Internet technology, the copyright protection of color images has become more and more important. In order to fulfill this purpose, this paper designs a blind color digital image watermarking method based on image correction and eigenvalue decomposition (EVD). Firstly, all the eigenvalues of the pixel block in the color host image are obtained by EVD. Then, the sum of the absolute value of the eigenvalues is quantified by the variable quantization steps to embed the color watermark image that encrypted by affine transform and encoded by the Hamming code. If the watermarked image is processed by geometric attack, then the attacked image can be corrected by using the geometric attributes. Finally, the inverse embedding process is performed to extract the color watermark. Moreover, the advantages of the proposed method are shown as follows: (1) all Peak Signal-to-noise Ratio (PSNR) values are greater than 42dB; (2) the average Structural Similarity Index Metric (SSIM) values are greater than 0.97; (3) the maximum embedded capacity is 0.25bpp; (4) whole running-time is less than 20s; (5) the key space is more than 2⁴⁵⁰; (6) most Normalized Cross-correlation (NC) values are more than 0.9. Compared with the related methods, the experimental results show that the proposed method not only has better watermark invisibility and larger watermark capacity, but also has higher security and stronger robustness against geometric attacks.

随着Internet技术的飞速发展，彩色图像的版权保护变得越来越重要。为了实现这一目的，本文设计了一种基于图像校正和特征值分解（EVD）的彩色数字图像水印方法。首先，通过EVD获得彩色主图像中像素块的所有特征值。然后，通过可变量化步骤对特征值的绝对值之和进行量化，以嵌入通过仿射变换加密并由汉明码编码的彩色水印图像。如果通过几何攻击对加水印的图像进行处理，则可以通过使用几何属性来校正被攻击的图像。最后，进行反嵌入处理以提取彩色水印。而且，该方法的优点如下：（1）所有峰值信噪比（PSNR）值均大于42dB；（2）平均结构相似性指标（SSIM）值大于0.97；（3）最大嵌入式容量为0.25bpp；（4）整个运行时间小于20s；（5）密钥空间大于2⁴⁵⁰ ; （6）大多数归一化互相关（NC）值均大于0.9。与相关方法相比，实验结果表明，该方法不仅具有较好的水印不可见性和较大的水印容量，而且具有较高的安全性和较强的抗几何攻击能力。