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Digital watermarking is a key technique practical intellectual property protecting systems and concealment correspondence systems. In this paper, we discussed a blind detection method for the digital image watermark. The theories research show that the orthogonal projection sequence of a digital image is one-to-one correspondence with this digital image. By this conclusion, we designed a novel blind watermark detector. In this detector, to calculate the correlation value between the image anddoi:10.5565/rev/elcvia.69 fatcat:wq76ommgt5ewlpht2j4fvqajcm