一种可抗几何攻击的二值文本图像数字水印算法

针对二值文本图像纹理丰富,信息隐藏量少和取值形式为二值的特点,提出了一种可抗几何攻击的二值文本图像水印算法.该算法基于DCT,它将二值图像的DCT、图像的视觉特征向量和加密技术有机结合起来,在提取水印时不需要原始图像,是一种实用的盲水印算法,并且水印的嵌入不影响图像质量.最后对水印图像进行了常见的旋转、缩放、平移、扭曲等几何攻击试验,结果表明,该算法有理想的抗几何攻击能力和较强的鲁棒性.

A Binary Text Digital Watermarking Algorithm Robust to Geometric Attacks

Focusing on the fact that most of the binary text images are featured complicated,little capability in date hiding and two values,the author presents a novel algorithm in the paper.The algorithm based on DCT is currently popular translation in image processing and has good compatibility.In the paper,the watermarking is combined with visual character of the image and the encryption well.Without original image the watermarking can be extracted,so it is a practical blind watermarking.The results resulted in geometric attack tests of the rotation,scaling,shift,and distortion have(abilities) of robustness of the proposed algorithm.