基于字符扰动变形和字库替换的鲁棒中文文本水印

Robust Chinese Text Watermarking Method Based on Chinese Character Glyph Perturbation and Font Replacing

为了解决当前中文文本数字水印鲁棒性低、无法适用于非格式化文件等问题,提出了一种基于汉字字符扰动变形和字库替换的鲁棒中文文本水印方法.通过修改汉字的笔画结构特征来生成扰动变形汉字字库,将同一汉字字符的不同扰动变形进行编号实现水印信息嵌入.根据汉字的使用频率及字符之间的相关性,设计了一种扰动变形字符分组算法,以提升水印嵌入和提取的效率和性能.通过仿真实验确定了最佳的分组长度以及适宜的变形字符数量,并通过消融实验和对比实验来证明本文方法的有效性.在手动设计的变形字库中使用本文方法可以将水印的提取准确率提升12.96个百分点,在通过网络模型自动生成的变形字库中本文方法也能将水印提取准确率提高13.30个百分点,表明了本文方法的可用性和普适性.对于常见的数字噪声干扰,本文方法在实验中也表现出了更强的鲁棒性.此外,还测试了针对载体不完整情况下的水印提取效果,展现了本文方法的高容错性和通用性.

In order to solve the problems of low robustness of current Chinese text digital watermarks,unsuitable for unformatted files,a robust Chinese text watermarking method based on Chinese character perturbation deformation and font library replacement is proposed.This method generates a perturbed and deformed Chinese character library by modifying the stroke structure characteristics of Chinese characters.Different perturbed deformations of the same Chinese character are numbered to embed the watermark information.According to the use frequency of Chinese characters and the correlation between characters,a perturbed and deformed character grouping algorithm is designed to improve the efficiency and performance of watermark embedding and extraction.The optimal grouping length and the appropriate number of modified Chinese characters are determined by simulation experiments,and the effectiveness of the method in this paper is proved by ablation experiments and comparative experiments.Using this method in the manually designed deformed font can improve the watermark extraction accuracy by 12.96 percentage points,and in the deformed font automatically generated by the network model,the proposed method can also improve the watermark extraction accuracy by 13.30 percentage points,which shows the usability and universality of the proposed method.For common digital noise interference,the method in this paper also shows strong robustness in experiments.In addition,this paper also tests the watermark extraction effect for incomplete carriers,demonstrating the high fault tolerance and versatility of this method.