Improved Data Hiding Method by Exploiting Modification Direction

X. Zhang and S. Wang proposed an Exploiting Modification Direction (EMD) method that fully exploits modification directions. Modifications in different directions were used to represent different secret data. In 5-ary notational system, only one secret digit is embedded for each two pixel. This paper proposes an improved method for EMD which can hide more secret data while maintaining a high PSNR value. The proposed method could embed on every pixel for cover data. The experimental results demonstrate that the proposed method has a high capacity and good quality.