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Related Experiment Video

Updated: Apr 30, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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An optimized watermarking scheme using an encrypted gyrator transform computer generated hologram based on particle

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    This study introduces a secure image watermarking method using encrypted computer-generated holograms (CGH) for enhanced data protection. The novel approach ensures high imperceptibility and robustness against various attacks.

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    Area of Science:

    • Digital image processing
    • Cryptography
    • Holography

    Background:

    • Digital watermarking is crucial for copyright protection and data integrity.
    • Existing methods face challenges in balancing imperceptibility, robustness, and security.
    • Encrypted computer-generated holograms (CGH) offer potential for secure watermarking.

    Purpose of the Study:

    • To propose a novel secure optimal image watermarking scheme.
    • To enhance security through an encrypted gyrator transform CGH in the contourlet domain.
    • To improve imperceptibility and robustness of digital watermarks.

    Main Methods:

    • A new encrypted CGH technique combining gyrator transform, random phase mask, three-step phase-shifting interferometry, and Fibonacci transform.
    • Embedding the encrypted CGH into the low-frequency sub-band of the contourlet-transformed host image using an improved quantization algorithm.
    • Optimizing embedding parameters with particle swarm optimization (PSO) for robustness and imperceptibility.

    Main Results:

    • The proposed watermarking scheme demonstrates superior imperceptibility and robustness compared to existing methods.
    • Experimental results confirm the scheme's security, invisibility, and resilience to various attacks.
    • The large key space of the encrypted CGH significantly enhances security strength.

    Conclusions:

    • The developed image watermarking scheme provides a secure, invisible, and robust solution.
    • The integration of encrypted CGH and contourlet domain processing offers significant advantages.
    • This method is effective for protecting digital image content against unauthorized access and manipulation.