Demosaicking authentication codes using adaptive step via color difference estimation

In this paper, data hiding is used for raw images instead of the full-resolution color version. Among various color filter array patterns, we choose the most popular Bayer pattern and cover authentication codes in the pseudo host from original sampling in terms of high correlation within red, blue and green channels. pseudo host is based on a transient image that is created by interpolating in this pattern by selecting the key. This procedure confirms the security, in the meantime, and less brings the artifact of embedding codes. This process exploits spatial correlations both red and blue channel to adaptively tune quantization scale parameter and suppresses visual distortion. Core structure presents a watermarking to jointly resist to demosaicking and JPEG compression approach. It can carry visual distortion as small as possible. The simulations test the robustness and transparency after some demosaicking methods and JPEG compression. These results imply that hiding data accompany with less demosaicking traces and the better robustness via various demosaicking methods.