DAI Zu-xu1, HONG Fan1, CUI Guo-hua1, et al. Watermarking text document based on statistic property of part of speech string[J]. 2007, (4): 108-113.DOI:
基于词性标记串统计特性的文本数字水印算法
摘要
提出了一个将n元熵方程化为至多(n?1)个一元非线性方程求解的算法
证明了算法的正确性
给出了误差估计。利用词性标记串的统计特性设计了一种基于熵的文本数字水印方案
该方案通过改变词性标记串的概率分布使其熵与嵌入的水印一致。由于水印函数是一类实值函数
其值域仅受计算精度限制
可以大幅度提高水印容量。
Abstract
An algorithm resolving nonlinear entropy equation with multivariable was described and proved firstly
then a new scheme where a text document is marked by accommodating probability distribution of certain part of speech strings to entropy constitutes the watermark was designed.Watermark function in the scheme values in a real number set domi-nated by computing precision
it is helpful to advances watermark capacity significantly.