Reversible data hiding (RDH) subtly alter the cover image for embedding the secret data, after extracting the secret data, the cover image can also be completely restored. In this work, we propose a novel RDH scheme based on Exploiting Modification Direction (EMD) with dual images. The characteristics of EMD matrix is exploited, one secret bit and a base-5 digit can be concealed in a cover pixel to generate a pixel pair which will be assigned to two stego images. Without any overhead message, the reversibility can be achieved. In the experiment, the proposed scheme outperforms some state-of-the-art methods in terms of measuring in embedding ratio (ER) or peak-signal-to-noise ratio (PSNR). In addition, the proposed scheme has good performance on resisting static attacks on pixel-value differencing histogram (PDH) and regular singular (RS) analysis.

可逆数据隐藏（RDH）巧妙地更改了用于嵌入机密数据的封面图像，在提取机密数据之后，也可以完全恢复封面图像。在这项工作中，我们提出了一种基于双图像利用修改方向（EMD）的新颖RDH方案。利用EMD矩阵的特性，可以在一个覆盖像素中隐藏一个秘密位和一个以5为基数的数字，以生成将分配给两个隐身图像的像素对。没有任何开销消息，就可以实现可逆性。在实验中，所提出的方案在嵌入率（ER）或峰信噪比（PSNR）的测量方面优于某些最新方法。此外，该方案在抵抗像素值差分直方图（PDH）和规则奇异（RS）分析的静态攻击方面具有良好的性能。