Improved Histogram-Shifting-Imitated Reversible Data Hiding Scheme

Wang et al. proposed a histogram shifting imitation based reversible data hiding scheme in 2013. They used the peak points of image intensity-based segments, instead of utilizing the peak point of an histogram. Their scheme has the limitation of the embedding capacity due to the embedding method. In this paper, we propose an improved data hiding scheme using median edge detection (MED) and hexadecimal exploiting modification direction (EMD). In embedding procedure, a predicted image is generated by using MED. The secret data is embedded into the peak points in segments by using hexadecimal EMD. In experimental results, the embedding capacity of the proposed scheme is superior to that of Wang et al.