REVERSIBLE DATA HIDING IN TWO STEGANOGRAPHIC IMAGES USING MATRIX CODING

In this paper, we propose a reversible data hiding method of high embedding efficiency. By referring to secret data, the method first applies Matrix Coding to determine the modified position of a seven-hit unit in the cover image. The method presented here requires only one bit, the position bit, to record the modified position for each seven-bit unit. The position bits will be appended to secret data and treat as a part of secret data. Then, the appended secret data are embedded in cover images by applying Matrix Coding. In the extracting phase, the secret data and the position hits are extracted from the hidden data. The position bits are used to reconstruct the original cover image, which can be recovered without any loss. The experimental results show that PSNR values of stego images are higher than 57 and thus our proposed method can produce high quality steganographic images.