High capacity reversible image authentication based on difference image watermarking

In this paper, we present a novel high capacity reversible image authentication scheme based on digital watermarking. The proposed technique slightly shifts the histogram of the difference image generated from the original cover image, thus modifies pixel values tenderly while obtaining a high embedding capacity. The distortion caused by embedding can be completely removed after the hidden data has been extracted if the watermarked image is authentic. The watermark data is blockwisely embedded so the tampered positions in a forgery image can be blockwisely detected wherever any disturbance is imposed. Experimental results demonstrate that the capacity of the proposed watermarking scheme is much higher than some state-of-art schemes with comparable PSNR values, while the computation complexity is kept low.