why correlation coefficient of extract watermark after cropping attack is almost the same correlation coefficient of extract watermark without attack ?
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With the rapid development of computer technology, the copyright protection of color image is becoming a more and more urgent problem. In this paper, an improved color image blind watermarking scheme based on Schur decomposition is proposed, which is different from using the binary or gray-level image as watermark. By analyzing the 4 × 4 unitary ma
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