Reversible Data Hiding in Encrypted Images by Reserving Room Before Encryption
Reversible Data Hiding in Encrypted Images by Reserving Room Before Encryption
复制标题
通过加密前预留空间可逆地将数据隐藏在加密图像中
DOI：
10.1109/tifs.2013.2248725
复制
发表时间：
2013-03-01
影响因子：
6.8
通讯作者：
Li, Fenghua
中科院分区：
文献类型：
--
作者：
Ma, Kede;Zhang, Weiming;Li, Fenghua
近年来，加密图像中的可逆数据隐藏（RDH）受到了越来越多的关注，因为它具有在提取嵌入数据后能够无损恢复原始载体的优良特性，同时还能保护图像内容的机密性。以往所有的方法都是通过从加密图像中可逆地腾出空间来嵌入数据，这可能会在数据提取和/或图像恢复方面出现一些误差。在本文中，我们提出了一种新的方法，即利用传统的可逆数据隐藏算法在加密前预留空间，这样数据隐藏者就可以很容易地在加密图像中可逆地嵌入数据。所提出的方法能够实现真正的可逆性，即数据提取和图像恢复没有任何误差。实验表明，对于相同的图像质量（例如以峰值信噪比dB衡量），这种新方法能够嵌入比以往方法多10倍以上的数据量。
Recently, more and more attention is paid to reversible data hiding (RDH) in encrypted images, since it maintains the excellent property that the original cover can be losslessly recovered after embedded data is extracted while protecting the image content's confidentiality. All previous methods embed data by reversibly vacating room from the encrypted images, which may be subject to some errors on data extraction and/or image restoration. In this paper, we propose a novel method by reserving room before encryption with a traditional RDH algorithm, and thus it is easy for the data hider to reversibly embed data in the encrypted image. The proposed method can achieve real reversibility, that is, data extraction and image recovery are free of any error. Experiments show that this novel method can embed more than 10 times as large payloads for the same image quality as the previous methods, such as for PSNR=40 dB.