Multipurpose Semi-Fragile Watermarking for Image Authentication

In this paper, we propose a new scheme in image authenticating and recovering using block-related index and three types of coefficient-scan strategy. Block-related authenticating information makes the feature codes tolerant in compression processes. Besides, a block-classification method is used for classifying blocks into flat, vertical-detailed or horizontal-detailed type. With that, a useful coefficient-scan strategy is chosen for preserving and recovering block information. As the experimental results, the watermarked image can provide a PSNR higher than 40.00dB and can mark and recover the blocks which could be maliciously tampered.