Abstract: According to the existing algorithm having encryption and information hidden process separation, limited capacity and inflexible operation problems, a novel reversible method is presented based on the chaos and the histogram shifting to overcome these disadvantages. A reversible map is used to permute the pixels in a block, after that, the histogram of each block is shifted to get space for the embedding data. The receiver can decrypt firstly and then extract information, the reverse order is also feasible. Simulation results show that the proposed algorithm is easy to implement, and can effectively expand the capacity.

Key words: histogram shift, reversible data hiding, image restoration, chaos, DLKL transform

摘要： 针对传统算法存在的加密和信息隐藏过程分离，嵌入容量小，操作不灵活的缺陷，提出了一种基于混沌和直方图平移的密文图像中的可逆信息隐藏算法。发送端先对图像加密，然后嵌入信息；接收端既可以先解密再提取信息，也可以先提取信息再解密。仿真实验结果表明该算法易于实现，并能有效提高信息嵌入的容量。

关键词: 直方图平移, 可逆信息隐藏, 图像恢复, 混沌系统, DLKL变换