基于图像伪装与双向差值扩展的密文域可逆信息隐藏算法  

Information hiding algorithm based on image camouflage and bidirection difference expansion

作　　者：廖文兴 刘成语 林松[1] 柳晓龙 Liao Wenxing;Liu Chengyu;Lin Song;Liu Xiaolong(College of Computer&Information Sciences,Fujian Agriculture&Forestry University,Fuzhou 350002,China;Center for Agroforestry Mega Data Science,Fujian Agriculture&Forestry University,Fuzhou 350002,China)

机构地区：[1]福建农林大学计算机与信息学院,福州350002 [2]福建农林大学农林大数据研究中心,福州350002

出　　处：《计算机应用研究》2024年第2期596-601,共6页Application Research of Computers

基　　金：福建省自然科学基金面上项目(2021J01123);福建省社会科学规划项目(FJ2021BF048)。

摘　　要：数字图像在云环境下的安全性问题已成为信息安全领域的研究热点之一。为解决传统密文域可逆信息隐藏算法缺乏伪装性,容易受到恶意攻击与信息隐藏空间容量小的问题,提出了基于图像伪装加密与双向差值扩展的大容量密文域可逆信息隐藏算法。该算法首先利用矢量量化与离散小波变换两种技术对原始图像进行伪装加密,从而保证隐蔽性,使得图像在云环境中安全传递;其次采用基于双向差值扩展的信息隐藏技术对伪装加密图像进行秘密信息的嵌入,以实现高容量的信息隐藏。实验结果表明,所提算法不仅实现了图像伪装,而且最终得到的含密伪装图像与原始图像在视觉上无明显差别,峰值信噪比达到40 dB以上,对原始图像起到了很好的伪装效果;同时实现了高容量的秘密信息嵌入,图像平均嵌入率接近0.6 bpp,表现出了良好的实验性能。The security of digital image in the process of cloud environment transmission becomes one of the research hotspots in the field of information security.In order to overcome the problems of insufficient camouflage ability,susceptibility to malicious attacks,and limited information hiding space in traditional reversible information hiding algorithms in the ciphertext domain,this paper proposed a high-capacity ciphertext domain reversible information hiding algorithm based on image camouflage encryption and bidirectional interpolation extension.This algorithm firstly employed two techniques,such as VQ coding and discrete wavelet transform,to perform camouflage encryption on the original image,ensuring secrecy and secure transmission of the image in cloud environments.Then,it utilized an information hiding technique based on bidirectional interpolation extension to embed secret information into the camouflaged encrypted image,achieving high-capacity information hiding.The experimental results show that the proposed method not only achieves image camouflage,but also has no obvious visual difference with the original image.The peak signal-to-noise ratio(PSNR)reaches more than 40 dB,indicating a good camouflage effect on the original image.It also achieves high-capacity secret information embedding with an average embedding rate of the image approaching 0.6 bpp with outstanding experimental performance.

关 键 词：图像伪装 信息隐藏 矢量量化 离散小波变换 差值扩展 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]