多比特嵌入的加密图像中可逆信息隐藏方法  

A Reversible Data Hiding Method in Encrypted Image With Multiple Bits Embedded

作　　者：王子驰 张媛[1] 张新鹏[1] 

机构地区：[1]上海大学通信与信息工程学院,上海201900

出　　处：《小型微型计算机系统》2014年第10期2331-2335,共5页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61472235)资助;教育部高校博士点基金项目(20113108110010)资助;上海市浦江人才计划项目项目(13PJ1403200)资助

摘　　要：提出一种大容量的加密图像中可逆信息隐藏方法.首先用加密密钥对图像进行加密,再将加密图像分块并根据信息隐藏密钥在每块中伪随机地选取多个集合,通过修改其中一个集合来嵌入信息.而多个集合对应了数据修改时的多种可能性,因此修改对应集合中的数据就能在每块中嵌入多比特信息.对一个包含额外信息的加密图像,先用加密密钥对图像进行解密,得到一幅与原始图像近似的图像.之后根据信息隐藏密钥,利用原始图像的空间相关性与块边沿像素的相关性提取额外信息并完全恢复原始图像.实验证明本方法的容量高于之前的方法.This paper proposes a reversible data hiding method in encrypted image with high capacity. We encrypt the original image by encryption key firstly, then segment the encrypted image into blocks and select a number of sets in each block by data-hiding key pseudo-randomly, and the additional message is embedded by modifying one of the sets. The multiple sets corresponding to a lot of possibilities of the data modification, so we can embed several bits in one block by modify the certain set. With an encrypted image containing additional data, we firstly decrypt it using the encryption key, so we obtain a version which is similar to the original image. According to the data-hiding key, with the aid of spatial correlation in natural image and the correlation in block edge pixels, the embedded data can be successfully extracted and the original image can be perfectly recovered. Experiments proves that this method has a higher capacity than the previous method.

关 键 词：图像加密 可逆信息隐藏 图像恢复 大容量 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]