结合2D Logistic映射与2D-DCT的数字图像隐藏技术  

Digital Image Hiding Technology Combining 2D Logistic Mapping and 2D-DCT

作　　者：程东升[1] 隆广庆 朱小玲 CHENG Dong-Sheng;LONG Guang-Qing;ZHU Xiao-Ling(School of Software Engineering,Shenzhen Institute of Information Technology,Shenzhen 518172,China;Department of Mathematics and Statistics,Nanning Normal University,Nanning 530299,China)

机构地区：[1]深圳信息职业技术学院软件学院,深圳518172 [2]南宁师范大学数学与统计学院,南宁530299

出　　处：《计算机系统应用》2022年第5期382-387,共6页Computer Systems & Applications

基　　金：广东省自然科学基金(2020A1515010566);广西研究生教育创新计划(YCSW2021278);深圳市科技计划(JCYJ20170306095959113);广西省自然科学基金(2017JJD110009,2019AC04004)。

摘　　要：为了应对日益增大的图像安全问题,提出一种结合二维Logistic映射与二维离散余弦变换(2D-DCT)的数字图像隐藏算法.首先,利用二维Logistic映射产生的混沌序列对秘密图像进行像素扩散与置乱,从而达到对秘密图像的加密效果.接着,分块对载体图像进行二维离散余弦变换,然后把扩散与置乱后的图像信息分存在变换后每块的右下角.最后再进行二维离散余弦反变换(2D-IDCT),并得到隐密图像.实验结果也表明,该算法安全可行且隐藏效果良好.To cope with increasingly serious problems related to image security,this study proposes a digital image hiding algorithm based on two-dimensional(2D)Logistic mapping and 2D discrete cosine transform(2D-DCT).Firstly,the chaotic sequence generated by the 2D Logistic mapping is used to diffuse and scramble pixels of the secret image so that the secret image can be encrypted.Then,2D-DCT is performed on the host image in blocks,and the image information after diffusion and scrambling is stored in the lower right corner of each block after 2D-DCT.Finally,2D inverse discrete cosine transform(2D-IDCT)is carried out to yield the stego image.Experimental results also show that the proposed algorithm is safe,feasible,and effective in image hiding.

关 键 词：二维LOGISTIC映射 二维离散余弦变换 图像隐藏 混沌序列 图像置乱 隐私保护 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]