Dual-Image Based Reversible Data Hiding Scheme Through Pixel Value Differencing with Exploiting Modification Direction

A dual image based reversible data hiding (RDH) method using pixel value difference (PVD) and exploiting modification direction (EMD) are introduced in this paper. First enlarge the cover image size and then select a pair of pixel for data embedding. We embed 4 bits secret message through pixel value difference and 3 bits secret message using embedding function of exploiting modification direction within a pixel pair. We obtain two modified pairs of pixel which contain 7 bits secret message. We then distribute these pixel pairs among dual stego images depending on a shared secret key (K). The recipient successfully obtain secret message and retrieve original image using same shared secret key. We compared our proposed method with other existing techniques and find out averagely good results with respective to payload.