摘要
针对已有文本水印嵌入算法中所采用的二进制数据流描述文本水印时所表达的信息有限、水印容量较小的问题,提出了一种基于文本编码分割的医学影像文本水印算法,通过二维离散小波变换对医学影像的不同层次进行分解,将编码分割处理后的文本水印嵌入到小波分解的三级低频部分,实现了文本水印的隐秘嵌入。实验结果表明,该算法可提高医学影像文本水印容量2-3倍。
In order to improve the watermark capacity of the existing text watermark algorithm which applies the binary data stream to express the watermark information.a code division based text watermark algorithm is proposed in this paper.This method using two-dimension discrete wavelet transform algorithm to decompose the lung CT image into different levels,and then embed the text watermark which be preprocessed with text code division into the low-frequency part of three-level decomposition by two-dimension discrete wavelet transform.The experiment results show that this method can improve the text watermark capacity greatly to 2-3 times.
出处
《沈阳航空工业学院学报》
2010年第2期59-63,共5页
Journal of Shenyang Institute of Aeronautical Engineering
基金
航空科学基金(项目编号:2008ZE54018)
关键词
数据隐藏
文本水印
编码分割
医学影像
data embed
text watermarking
code division
medical image
