A Novel Revesible Data Hiding based on Improved Pixel Value Ordering Method

Reversible data hiding based on the preservationof sorted pixel value ordering (PVO) technique has beenresearched and expanded recently due to its high embeddingcapacity and good image quality. secret data is always embedded in the largest or smallest pixel of the sub-block. Thus,each sub-block will embed two bits. The more blocks an imagehas, the higher the embedding potential. In this paper, to havemore sub-blocks, the paper divides the image into sub-blockswith 3 pixels and embeds 2 bits in the maximum value and1 bit in the minimum value. Therefore, each sub-block of theproposed embedding scheme is able to hide three bits insteadof the two bits as in the original scheme. The experimentalresults also show that the proposed scheme has a significantlyhigher embedding capacity.