基于加密医学图像的可逆信息隐藏算法  

Reversible data hiding algorithm based on encrypted medical images

作　　者：郑洪英[1] 程惠惠 

机构地区：[1]重庆大学计算机学院,重庆400044

出　　处：《计算机应用研究》2015年第12期3706-3709,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(61070246)

摘　　要：为了提高信息嵌入率和实现完全可逆信息隐藏技术,结合医学图像数据量大和同色像素连续性高的特点,提出了一种基于加密域的可逆信息隐藏算法。首先预处理图像并构造头部信息(head),即通过边缘检测算法检测出边缘,使嵌入率达到最大,用行程编码(RLC)对边界部分作无损压缩留出空间存放数据,使信息隐藏算法完全可逆;然后使用混沌算法加密图像;最后通过替换最低有效位的方法将水印信息嵌入到加密图像中。通过理论分析和仿真实验表明,该算法具有较高的信息嵌入容量,并且有较好的不可见性,从相关系数、熵值、峰值信噪比等方面分析,都达到了较高水平。In order to improve the information embedding rate and implement real reversibility of data hiding technology, combined with the characteristics of medical image （ huge data and high continuity of same color pixels）, this paper proposed a reversible data hiding algorithm based on encrypted medical images. At first, it preprocessed image and constructed header information. The scheme obtained the maximum embedding rate using edge detection, and compressed boundary portion using run length coding （ RLC ） to vacate room. And it made the information hiding algorithm reversible completely. Then it encrypted the image using chaotic algorithm. Finally, it embedded watermark information in the encrypted image by replacing the least significant bits. The theoretical analysis and simulations show that the algorithm has high information embedding capacity and good invisibility, which reaches a high level in aspect of the correlation coefficient, the entropy value, peak signal to noise ratio.

关 键 词：医学图像 边缘检测 行程编码 混沌加密 信息隐藏 完全可逆性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]