An Image Authentication Scheme with Discrimination of Tampers on Watermark or Image
Gang Yao · Dianzi xuebao · 2008
The existing fragile watermarking algorithms almost can't recognize the modification made to the watermarked image is on the image content or on the embedded watermark.In this paper,a novel fragile watermarking scheme is proposed.The recovery watermark of each block is embedded into the Hypo-LSB of the corresponding excursion block selected by a key,and the authentication watermark of each block is embedded into its LSB.Theoretical analysis and simulation results show that the proposed algorithm can not only thwart the VQ attack and locate tampered blocks accurately,but also discriminating tampering watermark from that of content.And in some case,it can restore the tampered region effectively.