用于实现医学图像对比度增强的密文域可逆信息隐藏算法  

Reversible data hiding method in encrypted domain for the contrast enhancement of medical image

作　　者：李安 周亮 张建青 陈立范 周艳丽 王宏杰 孔平 LI An;ZHOU Liang;ZHANG Jianqing;CHEN Lifan;ZHOU Yanli;WANG Hongjie;KONG Ping(School of Health Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Collaborative Innovation Center,Shanghai University of Medicine and Health Sciences,Shanghai 201318,China;College of Medical Imaging,Shanghai University of Medicine and Health Sciences,Shanghai 201318,China;College of Arts and Science,Shanghai University of Medicine and Health Sciences,Shanghai 201318,China)

机构地区：[1]上海理工大学健康科学与工程学院,上海200093 [2]上海健康医学院协同科研中心,上海201318 [3]上海健康医学院医学影像学院,上海201318 [4]上海健康医学院文理教学部,上海201318

出　　处：《上海理工大学学报》2024年第1期95-102,共8页Journal of University of Shanghai For Science and Technology

基　　金：国家重点研发计划(2022YFC3103-003002);上海市浦江人才计划(22PJD031)。

摘　　要：针对现有密文域医学图像可逆信息隐藏算法存在解密图像视觉质量较低的问题,提出了一种基于差值直方图平移的密文域可逆信息隐藏算法。首先,发送方采用具有同态密文比较性质的加密算法对原始医学图像进行加密,从而保证医学图像的隐私内容不被泄露。然后,嵌入方利用同态性质对接收到的密文图像计算差值直方图,并通过平移差值直方图在密文图像中嵌入信息。为了获得较大的嵌入率,嵌入方可对密文图像进行多轮次信息嵌入。最后,接收方根据拥有的密钥种类对接收到的含有嵌入信息的密文图像进行信息提取、图像解密和图像恢复。实验结果表明,本文算法提升了解密医学图像的视觉质量,同时具有较高的嵌入率和安全性。Aiming at the problem that the visual quality of the decrypted image is low in the existing reversible data hiding methods for the encrypted medical image,a reversible data hiding method in encrypted domain based on the difference histogram shift was proposed.Firstly,to ensure that the private content of the medical image was not leaked,the sender using an encryption algorithm with the property of homomorphic ciphertext comparison encrypted the original medical image.Then,on the data-hider side,the difference histogram of the received encrypted image was calculated using the homomorphic property,and the secret data was embedded in the encrypted image by shifting the difference histogram.In order to obtain a high embedding rate,the data-hider could conduct multiple rounds of data embedding in the encrypted image.Finally,according to the type of the keys possessed,the receiver could perform data extraction,image decryption and image recovery for the received encrypted image containing embedded data.The experimental results show that the proposed method improves the visual quality of the decrypted medical image,and has high embedding rate and security.

关 键 词：可逆信息隐藏 医学图像 直方图平移 同态加密 图像对比度增强 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]