计算机应用 ›› 2014, Vol. 34 ›› Issue (1): 119-123.DOI: 10.11772/j.issn.1001-9081.2014.01.0119

• 计算机安全 • 上一篇    下一篇

基于可逆可见水印的医学图像隐私保护算法

高海波1,2,邓小鸿2,3,陈志刚2   

  1. 1. 湖南涉外经济学院 信息科学与工程学院,长沙 410205
    2. 湖南省高等学校医学信息研究重点实验室(中南大学),长沙 410083;
    3. 江西理工大学 应用科学学院,江西 赣州 341000
  • 收稿日期:2013-06-06 修回日期:2013-08-15 发布日期:2014-02-14 出版日期:2014-01-01
  • 通讯作者: 邓小鸿
  • 基金资助:

    国家自然科学基金资助项目

Medical Image Privacy Protection Scheme Based on Reversible Visible Watermarking

GAO Haibo1,2,DENG Xiaohong1,3,CHEN Zhigang1   

  1. 1. Hunan Key Laboratory of Medical Information Research (Central South University), Changsha Hunan 410083, China;
    2. School of Information Science and Engineering, Hunan International Economics University, Changsha Hunan 410205, China;
    3. School of Applied Science, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China
  • Received:2013-06-06 Revised:2013-08-15 Online:2014-02-14 Published:2014-01-01
  • Contact: DENG Xiaohong

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摘要： 针对医学图像感兴趣区域隐私泄露问题,提出了一种新的基于可逆可见水印的隐私保护算法。算法将二值水印图像嵌入在医学图像感兴趣区域实施隐私保护,利用人类视觉系统(HSV)的掩蔽特性和自适应的像素映射机制,对水印可见性和透明性进行动态调整;采用收缩投影技术,有效解决了嵌入过程中可能出现的溢出问题;最后,随机数密钥的引入增强了可见水印的鲁棒性。实验结果表明,算法嵌入的水印具有较好的可见性和透明性,产生的水印附加信息数量仅为65608位;另外,在不知道密钥情况下,水印移去困难,恢复后图像与嵌入水印后图像质量相差不到1dB。

关键词: 可逆水印, 可见水印, 医学图像, 隐私保护, 人类视觉系统

Abstract: In order to solve the problem of privacy disclosure in medical image's interest of region, a new reversible visible watermarking based privacy detection algorithm was proposed. The method embedded a binary watermark image into the interest of region of original medical image to protect privacy, and used visual masking of Human Visible System (HSV) and pixel's mapping mechanism to dynamically adjust the visibility and transparence of watermark. In addition, a shrinking projection technology was utilized to solve the problem of potential overflow and underflow during the embedding procedure. Finally, a random key was introduced to enhance the embedded watermark's robustness. The experimental results show that the proposed method achieves better performance in visibility and transparence of watermark, and the number of additional information produced by embedding is only 65608bits. In addition, the deletion of watermark is difficult without knowing the correct key, and the quality difference between the watermarked image and the recovered image is less than 1dB.

Key words: reversible watermarking, visible watermarking, medical image, privacy protection, Human Visible System (HSV)

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