Data hiding schemes based on the formal improved exploiting modification direction method

Steganography is an important strategy in the field of data security. Its main purpose is to hide secret information by embedding it in a cover image. The quantity of data that can be hidden in a single cover image is also very important. Recently, a high capacity technique called Exploiting Modification Direction (EMD) data hiding wa s introduced by Zhang and Wang. In order to enhance embedding quality, Lee et al. proposed an improved scheme using the change data base method. However, both of these schemes use a fixed equation to calculate and store secret data, so if their encoding form ula is disclosed, the secure data will be compromised. In this paper, we propose two kinds of weight-changing evaluation of the high capacity EMD data hiding strategy. The major contribution of these two proposed schemes are their embedding formulas can be made public; one of them uses the table checking method to change the weighting evaluation of the high capacity EMD data-hiding strategy, and the other uses formal high capacity EMD data hiding. Experimental results show that the proposed scheme not only retains high embedding capacity and stego image quality of the original scheme but is also more secure than the LWC-scheme.