A Novel Reversible Data Hiding Based on Improved Pixel Value Ordering Method

Tóm tắt

Reversible data hiding based on the preservation of sorted pixel value ordering (PVO) technique has been researched and expanded recently due to its high embedding capacity and good image quality. secret data is always em-bedded in the largest or smallest pixel of the sub-block. Thus, each sub-block will embed two bits. The more blocks an image has, the higher the embedding potential. In this paper, to have more sub-blocks, the paper divides the image into sub-blocks with 3 pixels and embeds 2 bits in the maximum value and 1 bit in the minimum value. Therefore, each sub-block of the proposed embedding scheme is able to hide three bits instead of the two bits as in the original scheme. The experimental results also show that the proposed scheme has a significantly higher embedding capacity.