基于模函数与像素值差值的高质量双图像可逆信息隐藏

为解决在一些一对二的交流场景中使用信息隐藏技术来传递信息时对载密图像的视觉质量和载体图像的精确度的高要求问题. 在本文中提出了一种基于模函数和像素值差值(pixel value difference , PVD)的双图像可逆信息隐藏方案, 通过模函数和对数函数确定了PVD范围表, 从而确定在单位面积上的信息嵌入位数以及模函数的系数. 所提出的方案可以在信息嵌入位数不断增加的情况下仍然保持像素值的修改量与信息嵌入位数之比不大于0.5, 所以与目前一些基于PVD的方案相比在像素对差值越大的图像中越占有优势. 实验结果表明与现有的一些在载密图像质量方面优质的方案相比, 具有更高的PSNR和SSIM, 此外本方案在抗RS隐写分析和PDH隐写分析的静态攻击方面上具有良好的性能, 并且避免了大多数在基于像素值差值的信息隐藏方案中对溢出问题的解决方案复杂繁琐的情况.

Reversible Data Hiding for High Quality Dual Images Based on Modular Function and Pixel Value Difference

There are high requirements for the visual quality of the loaded image and the accuracy of the carrier image when information hiding technology is used to transmit information in some one-to-two communication scenarios. In this study, a reversible information hiding scheme of double images is proposed based on the modular function and the pixel value difference (PVD). The range table of the PVD is determined by the modular function and logarithm function, so as to determine the embedding bit of information per unit area and the coefficient of the modular function. The proposed scheme can keep the ratio of the modification amount of pixel value to the embedding bit of information no more than 0.5 even when the embedding bit of information keeps increasing. Therefore, compared with other schemes based on PVD, the proposed scheme has more advantages in the image with a larger difference of pixel pairs. The experimental results show that the scheme has higher PSNR and SSIM than some existing schemes in terms of the quality of the loaded image. In addition, the scheme has excellent performance against static attacks of RS steganography and PDH steganography, and it avoids the complicated solution of overflow problem in most information hiding schemes based on PVD.