A block-based adaptive high fidelity reversible data hiding scheme in interpolation domain

Reversible Data Hiding (RDH) schemes enjoy the accomplishment of achieving high embedding capacity (EC) in interpolation domain. However, most existing methods usually embed the secret data into non-reference pixels blindly without considering the correlations between the reference pixels. Thus, these methods are not superior in the aspect of visual quality of the watermarked images. To improve this disadvantage, this paper proposes a block-based adaptive high fidelity RDH method. Firstly, the interpolated image is created according to the value of the reference pixels. Then, we divide the interpolated image into overlapping 3×3 blocks and embed the secret data into interpolated pixels with small noise level preferentially. By using the center folding strategy (CFS), higher visual quality of the constructed watermarked image can be guaranteed. Furthermore, there is not overflow or underflow problem in our method and the reversibility is achieved without any overhead message. In the experimental results, the proposed scheme outperforms several existed methods and stands pixel-value differencing histogram (PDH) analysis and regular singular (RS) analysis, which elaborate the effectiveness of our method.