In this article, a new reversible data hiding scheme using pixel-value differencing in dual images is proposed. The proposed pixel-value differencing method can embed more secret data as the difference value of adjacent pixels is increased. In the proposed scheme, the cover image is divided into non-overlapping blocks and the maximum difference value is calculated to hide secret bits. On the sender side, the length of embeddable secret data is calculated by using the maximum difference value and the log function, and the decimal secret data are embedded into the two stego-images after applying the ceil function and floor function. On the receiver side, the secret data extraction and the cover image restoration can be performed by using the correlation between two stego-images. After recovering the cover image from two stego-images, the secret data can be extracted using the maximum difference value and the log function. The experimental results show that the proposed scheme has a higher embedding capacity and the proposed scheme differs in embedding the secret data depending on the characteristics of the cover image with less distortion. Also, the proposed scheme maintains the degree of image distortion that cannot be perceived by the human visual system.

中文翻译：

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基于像素值差分的双图像可逆数据隐藏方案

在本文中，提出了一种在对偶图像中使用像素值差分的新的可逆数据隐藏方案。随着相邻像素差值的增加，所提出的像素值差分方法可以嵌入更多的秘密数据。在所提出的方案中，将覆盖图像划分为不重叠的块，并计算最大差值以隐藏秘密位。在发送端，利用最大差值和log函数计算可嵌入秘密数据的长度，应用ceil函数和floor函数将十进制秘密数据嵌入到两个stego-image中。在接收端，可以利用两个隐写图像之间的相关性来进行秘密数据的提取和覆盖图像的恢复。从两个隐写图像中恢复封面图像后，可以使用最大差值和日志函数提取秘密数据。实验结果表明，所提出的方案具有更高的嵌入容量，并且所提出的方案在嵌入秘密数据方面根据覆盖图像的特征不同而失真较小。此外，所提出的方案保持了人类视觉系统无法感知的图像失真程度。