Digital Image Watermarking Processing in DCT Domain
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Digital image watermarking technology based on the Discrete Cosine Transform (DCT) domain has undergone extensive testing and research, demonstrating effective capabilities for watermark detection and extraction. This technology holds significant application value in protecting digital image copyrights and authentication. By embedding watermark information in the DCT domain, it enhances the invisibility and robustness of digital images. The implementation typically involves dividing the image into 8x8 blocks, applying DCT transformation to each block, modifying specific mid-frequency coefficients to embed the watermark data, and then performing inverse DCT to reconstruct the watermarked image. Additionally, this technology can be applied to secure digital image transmission and anti-counterfeiting domains, providing an effective solution for digital image protection through algorithmic approaches like coefficient quantization and frequency domain manipulation.
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