基于汉字结构知识的鲁棒性公开文本水印

Robust Public Text Watermarking Based on Structure Knowledge of Chinese Characters

针对中文文本存在的版权保护问题,文章提出了一种新的文本水印算法。该方法通过汉字数学表达式,获取汉字的结构类型和笔画数,利用汉字的结构类型将整个文档分成两块,在各块中由汉字笔画数和水印比特位共同确定水印加载的位置,通过设置字体下划线以嵌入水印。水印提取时不需要原始文档和原始水印,通过块校验和海明校验可将破坏的水印比特位进行恢复。实验结果表明该算法具有较好的透明性和鲁棒性。

A novel text watermarking algorithm is proposed to sovle the proplem of copyright protection in this paper. This method obtains structure types and strokes of Chinese characters through Chinese characters mathematic expression,then the whole document is divided into two blocks by utilizing structure types of Chinese characters.In each block,the position selected to embed is choosed by Chinese character＇s strokes and the watermarking bit.Embeding is implemented through seting underline to font.Watermarking can be extracted without original document and original watermarking information.When the watermarking bit is destroyed,block checkout and hamming checkout are used to recover it.The experimental result indicates that the algorithm has preferable transparency and robustness.