The study of steganographic algorithms based on pixel value difference

Abstract

Wu and Tsai proposed PVD (pixel-value differencing) data hiding method in 2003. PVD partitions a cover image into nonoverlapping blocks of two consecutive pixels and calculated the difference value from the two pixels in each block. This method provides an easy way to produce a more imperceptible result. Afterwards, some scholars have proposed PVD-related improvements in image quality and embedding capacity. This paper classifies and discusses the recent PVDbased methods. We will compare each PVD related method in terms of the embedding capacity and PSNR.