摘要： 传统的利用像素差(PVD)进行隐写的方法，通常只考虑水平方向的PVD而忽略垂直方向的PVD。为此，将原始图像分成互不相交的2×2的像素块，在水平和垂直2个方向上分别采用基于模函数的方法和普通PVD的方法进行隐写，并针对2种方法的特点对越界情况进行调整。实验结果表明，该方案能改善隐写图像的质量，提高嵌入容量，并能抵抗常见攻击。

关键词: 像素差, 隐写, 模函数, 嵌入容量

Abstract: The traditional steganography methods with Pixel Value Differencing(PVD) usually only deal with the PVD in the horizontal direction but ignore the vertical one. In this paper, the cover image is divided into 2×2 nonoverlapping blocks, then the modulus function method is used in horizontal direction and the simple PVD method is used in vertical direction for steganography. The falling-off-boundary problem is solved. Experimental results show that the proposed approach provides higher stego-image quality, larger embedding capacity, and can against common attacks.

Key words: Pixel Value Differencing(PVD), steganography, modulus function, embedding capacity

中图分类号: 

• TP391