| 一种基于零水印的医学图像真伪性认证算法 |
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| 引用本文： | 秦娜,张贵仓.一种基于零水印的医学图像真伪性认证算法[J].甘肃科学学报,2009,21(4):62-64. |
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| 作者姓名： | 秦娜 张贵仓 |
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| 作者单位： | 西北师范大学,数学与信息科学学院,甘肃,兰州,730070 |
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| 基金项目： | 甘肃省科技攻关项目，国家教育部重点科学技术项目，兰州市工业科技攻关技术项目 |
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| 摘 要： | 提出一种基于零水印的医学图像真伪性认证算法.该算法对原始医学图像进行分块整数小波变换,在每个分块的低频和高频分别提取4个系数,取其最低有效位与文本水印的对应位相异或,得到2个密钥作为零水印,认证时使用这2个密钥恢复水印信息.算法复杂性低安全性高,不改变原始医学图像.结果表明,该算法能够实现对医学图像的真伪性认证,具有较好的篡改定位能力.
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| 关 键 词： | 零水印 医学图像 文本水印 整数小波变换 |
An Identifying Authentication Algorithm for Medical Images Based on Zero-Watermark |
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| QIN Na,ZHANG Gui-cang.An Identifying Authentication Algorithm for Medical Images Based on Zero-Watermark[J].Journal of Gansu Sciences,2009,21(4):62-64. |
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| Authors: | QIN Na ZHANG Gui-cang |
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| Institution: | QIN Na,ZHANG Gui-cang(College of Mathematic and Informational of Science,Northwest Normal University,Lanzhou 730070,China) |
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| Abstract: | An identifying authentication algorithm for medical images based on zero-watermark is presented.The algorithm splits the original medical image to some blocks to do integral wavelet transform,chooses four low-frequency coefficients and four high-frequency coefficients in every block,and chooses the least significant bits,then dose the XOR operations with the corresponding bit of text watermark.We make the two keys as zero-watermark and use them to extract the text watermark to authenticate the image.The alg... |
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| Keywords: | zero-watermark medical image text watermark integral wavelet transforms |
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