A Novel Reversible Data Hiding Based on Exploiting Modification Direction Algorithm

In this paper, a novel reversible data hiding technique based on exploiting modification direction algorithm is proposed. First, binary secret messages are converted into a sequence of data in a 5-ary notational system. Then two equal gray images are used as cover objects. In accordance with Human Visual System, the secret messages are embedded into each pair of the integer wavelet coefficients of the two gray images. Furthermore, to avoid overflow problem, histogram modification technology is used. Experiment results show that it can obtain 1 bit per pixel (bpp) in many images when the data is embedded in the single-layer. At the same time, each of the two images achieves high capacity while keeping low distortion.