基于像素调制自适应编码密文域的可逆信息隐藏算法
Reversible data hiding algorithm with pixel modulation adaptive coding in encrypted domain
王玉 1孔祥婷 1吴媛媛1
作者信息
- 1. 湖北大学计算机与信息工程学院,湖北 武汉 430062
- 折叠
摘要
针对图像信息隐藏不能产生理想的有效负载问题,提出一种基于像素调制自适应编码密文域的可逆信息隐藏算法.首先,对灰度图像做块间置乱并进行像素调制预处理,设计块内像素位置变换矩阵保证分块置乱前后中心像素的预测误差不变.接着,利用最邻近像素差分方法保持加密图像块内的空间冗余,根据预测误差的频率自适应生成哈夫曼编码,并对比哈夫曼编码中比特位将信息嵌入到预留空间中.最后,对所提出算法进行实验分析,实验结果表明:提出的算法具有可逆性和信息分离性,与自适应差分图像恢复算法相比,平均嵌入率提高了 0.299 bpp.
Abstract
To solve the problem that image information hiding cannot produce an ideal payload,a reversible data hiding algorithm with pixel modulation adaptive coding in encrypted domain was proposed.In the algorithm,the grayscale images were firstly performed interblock scrambling and pixel modulation preprocessing,and the pixel position transformation matrix within the block was designed to ensure that the prediction error of center pixels remains unchanged before and after block scrambling.Furthermore,the pixel difference method of nearest neighbors was presented to maintain the spatial redundancy in the encrypted image block.Then the Huffman code was generated adaptively according to the frequency of pixel prediction error,and the additional information was embedded into the marked reserved space by bit substitution.Finally,experimental analysis was conducted on the proposed algorithm,and the results showed that it had reversibility and information separation.Compared with the adaptive differential image restoration algorithm,the average embedding rate increased by 0.299 bpp.
关键词
可逆信息隐藏/密文域/自适应编码/分块置乱/图像加密Key words
reversible data hiding/encrypted domain/adaptive coding/block scrambling/image encryption引用本文复制引用
出版年
2025
NETL
NSTL
万方数据