Research on reversible information hiding technique on multi-gray level images with three images containing information

Abstract

Reversible data hiding is an active information security field that has received the attention of many researchers. This paper focuses on researching the reversible hiding method based on PVO (Pixel Value Ordering). This is a technique to partition pixels into blocks and arrange them in ascending order, embedding information based on the prediction errors at the largest and smallest pixels. The characteristics of the PVO method are high image quality but limited embedding capacity.