一种基于数学形态学膨胀运算的文本数字水印  

A Text Watermarking Based on the Dilation Operation of Mathematical Morphology

作　　者：宾西川[1] 裘正定[1] 章春娥[1] 曾高荣[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044

出　　处：《计算机安全》2009年第11期4-6,10,共4页Network & Computer Security

摘　　要：当文档图像中的字间距过小时,字移编码文本数字水印容量就会受到极大限制。通过构造两种结构元素,对灰度文档图像进行基于数学形态学的膨胀运算,增大了字符间距,并且算法能够很好地保持笔画完整性及文档整体视觉质量。对处理后的图像采用字移编码方式嵌入水印信息,增加了水印容量。The capacity of the word-shifting coding text watermarking is Iimited for text image＇s small character spacing. By constructing two kinds of structure elements, the dilation operation of mathematical morphology is done to increase the character spacing and simultaneously maintain the integrity of the strokes ＆ high visual quality in this paper, Based on word--shifting coding, the theoretical results and the empirical data have showed that embedding capac）ty of the processed image is much higher than that of the unprocessed image.

关 键 词：二值化 数学形态学 结构元素 字移编码 文本数字水印 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP391[自动化与计算机技术—计算机科学与技术]