基于预测误差扩展的可逆文本水印算法  

Reversible Text Watermarking Algorithm Based on Prediction Error Expansion

作　　者：费文斌[1] 唐向宏[1,2] 王静[1] 林新建[1] 

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018 [2]杭州电子科技大学信息工程学院,浙江杭州310018

出　　处：《中文信息学报》2015年第1期133-138,145,共7页Journal of Chinese Information Processing

摘　　要：为了避免在水印嵌入后造成文本内容的永久性改变,该文借鉴图像中可恢复水印的思想,将预测误差扩展应用于文本文档,提出了一种基于预测误差扩展的可逆中文文本水印算法。该算法以句子为单位,通过上下文搭配度大小选择可替换的词语,最后利用预测误差扩展和混沌序列,实现水印的嵌入。研究结果表明该算法不仅具有较高的安全性,而且能有效地提取水印和无损地恢复出原始文本。In order to avoid the permanent change of the text content caused by watermark embedding, this paper proposes a reversible watermarking algorithm for Chinese text document based on prediction error expansion en- glightened by the reversible watermarking for the image. Taking the sentence as the unit, The algorithm selects the words to be replaced according to the size of context collocation degree, and then realizes the embedding by the pre- diction error expansion and Chaos Sequence. Results show that this algorithm not only has the higher security, but also can extract watermark effectively while maintaining an exact restoration of the original text.

关 键 词：可恢复水印 预测误差扩展 文本文档 搭配度 混沌序列 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]