Image dark watermarking method, device and equipment based on DCT intermediate frequency difference value modulation and pseudo-random spread spectrum

By employing DCT intermediate frequency difference modulation and pseudo-random spread spectrum image dark watermarking method, the problems of insufficient visual perceptibility and resistance to compression attacks in existing technologies are solved, and high-security and robust watermark information storage is achieved.

CN122288965APending Publication Date: 2026-06-26XIAMEN GUAGUALONG NETWORK TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAMEN GUAGUALONG NETWORK TECHNOLOGY CO LTD
Filing Date
2026-03-31
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing digital image watermarking schemes have shortcomings in terms of visual perceptibility, resistance to compression attacks, and key security, and cannot meet the requirements for high-security copyright protection.

Method used

A method for image dark watermarking based on DCT intermediate frequency differential modulation and pseudo-random spread spectrum is adopted. The spread spectrum watermark bit sequence is generated by Hamming error correction coding and key-driven pseudo-random spread spectrum processing. The DCT transform coefficient matrix is ​​generated by discrete cosine transform, and the watermark information is embedded by differential modulation in the intermediate frequency coefficient pairs. Finally, the watermarked image is reconstructed by inverse transform.

Benefits of technology

It improves the concealment and confidentiality of watermark information, enhances resistance to statistical analysis, and can robustly store watermark information under JPEG compression attacks, ensuring visual consistency of images and integrity of watermark information.

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Abstract

This application provides a method, apparatus, and device for image dark watermarking based on DCT intermediate frequency difference modulation and pseudo-random spreading. The method performs Hamming error correction coding and key-driven pseudo-random spreading processing on the watermark information to be embedded to generate a spread-spectrum watermark bit sequence; it performs channel extraction and frequency domain representation generation processing based on discrete cosine transform on the original image to obtain a DCT transform coefficient matrix; based on the spread-spectrum watermark bit sequence, it performs intermediate frequency coefficient pair difference modulation embedding processing on the DCT transform coefficient matrix to generate a modulated frequency domain coefficient matrix carrying watermark feature information; it performs image domain inverse transformation reconstruction on each modulated frequency domain coefficient matrix and outputs a target image containing a dark watermark that is visually consistent with the original image. This application, through intermediate frequency difference modulation and spreading mechanisms, solves the shortcomings of traditional schemes in terms of visual invisibility, resistance to compression attacks, and security, significantly improving the robustness of the watermark.
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