基于图像连通性不变文档水印算法的鲁棒性研究

Robust of Document Watermarking Algorithm Based on Connectivity-Preserving

针对二值文档图像的连通性是其拓扑结构的特点,提出对基于图像连通性不变文档水印算法的鲁棒性进行研究。利用可翻转像素标准确定可翻转像素,然后将加密后水印信息代替可翻转像素实现水印嵌入,对含水印图像进行噪声攻击和局部篡改的鲁棒性分析。实验结果表明,该算法具有良好的不可见性,能够抵抗噪声攻击,并且也能抵抗删除、修改和添加等局部篡改攻击,其特点可用于对一些文档图像的版权保护。

For the binary document images’connectivity is its topology,the robust of the document watermarking algorithm by connectiv ity-Preserving is analyzed.The criteria of the flippable pixels are used to judge the flippable pixels.The watermarked image can be ob tained by inserting the encrypted watermarking into the flippable pixels.The watermarking is performed by extracting the central pixel in the embeddable blocks.Experiments show that the watermarked document image has good quality.The algorithm has robustness for the noise attack and local tampering attack such as deletion,modification and addition.It can be used to protect the copyright of the binary document images.