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A novel semi-fragile digital watermarking method based on the Slant transform (SLT) for image authentication and selfrestoration is introduced in this paper. The watermark bits are embedded into the middle frequency region of each block after applying SLT of the original image. The original image is further compressed and then embedded into the least significant bits (LSBs) of the watermarked image for subsequent self-restoration. The tampered regions of the watermarked image can be detecteddoi:10.1109/iih-msp.2007.50 dblp:conf/iih-msp/ZhaoHTPCJ07 fatcat:nz5fxfeb5fbl5dsiyezjqtjwt4