DCT-based digital watermarking technique, the watermark processing technology and the use of image scaling to adjust the original image histogram, according to the human visual system, in each block of DCT-DC components on the embedded watermark information, and information in the watermark embedding prior to its scrambling encryption to provide double security guarantees, followed by JPEG compression attacks on the DCT domain robustness of tests to demonstrate the anti-attack capability of DCT.

DCT.txt

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