摘要
提出了一种基于块重构的加密域可逆信息隐藏方法。首先使用一种特定的加密方法对原始图像块进行加密,其中包括置乱和块重构,该方法能够有效地将冗余从最高有效位转移到最低有效位;其次将位平面划分为不重叠的均匀块和非均匀块,通过标签图对这两种类型的图像块进行区分及记录;最后在可嵌入信息的均匀块中嵌入相关辅助数据,并将秘密信息嵌入到剩余的可用块中。基于加密密钥和数据隐藏密钥的可用性,接收端能够可分离地实现准确提取所嵌入的数据以及无损地恢复原始图像。实验结果表明,该方法在一定程度上提高了信息嵌入量和直接解密图像的解密质量。
We propose a reversible data hiding scheme in encrypted domain based on block rearrangement in bit plane. Firstly, specific encryption methods, including scrambling and block rearranging, are applied to encrypt an original image. Secondly, scrambled bit planes are divided into non-overlapping blocks, including homogeneous blocks and nonhomogeneous blocks, and a label map is generated to identify these two kinds of blocks.Thirdly, after embedding necessary auxiliary data into embedded homogeneous blocks, data hider can embed additional data into the remaining available blocks. Based on the availability of encryption key and data hiding key, receivers can realize separable operations of data extraction efficiently and image recovery losslessly. Experimental results demonstrate that the proposed scheme gains improvement both in embedding capacity and in the quality of decrypted image.
作者
杨阳
李欣然
胡锦川
YANG Yang;LI Xinran;HU Jinchuan(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《应用科学学报》
CAS
CSCD
北大核心
2021年第6期906-922,共17页
Journal of Applied Sciences
基金
上海市自然科学基金(No.13ZR1428400)
上海市教育委员会科研创新项目(No.14YZ087)
上海智能家居大规模物联共性技术工程中心项目(No.GCZX14014)
沪江基金(No.C14001,No.C14002)资助。
关键词
可逆信息隐藏
图像加密
块重构
图像恢复
reversible data hiding
image encryption
block rearrangement
image recovery
