Analyses of Pixel-Value-Differencing Schemes with LSB Replacement in Stegonagraphy

This paper shows that a steganographic scheme based on Wu et al. 's pixel-value differencing (PVD) and least-significant-bit (LSB) replacement method is too conformable to the LSB approach. Their PVD+LSB method can embed secret data larger than the PVD method, however, it is detectable by Fridrich et al. 's method but PVD method is not. Some of the shortcomings of the PVD+LSB method are shown in this paper. At the same time, some techniques are proposed for improving the image quality of the PVD+LSB method without sacrificing the capacity. All proposed techniques are demonstrated by experimental results.