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Fractional Fourier domain optical image hiding using phase retrieval algorithm based on iterative nonlinear double

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    A new image hiding technique uses a phase retrieval algorithm and nonlinear double random phase encoding in the fractional Fourier domain. This method efficiently hides images with reduced key transmission, enhancing security.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Digital Image Processing

    Background:

    • Digital image hiding is crucial for secure data transmission.
    • Existing methods often require complex computations or reveal information.
    • Fractional Fourier domain offers unique properties for optical security applications.

    Purpose of the Study:

    • To introduce a novel, secure image hiding method.
    • To enhance security by reducing key transmission requirements.
    • To demonstrate the feasibility and effectiveness of the proposed algorithms.

    Main Methods:

    • Utilizing a phase retrieval algorithm within nonlinear double random phase encoding.
    • Employing two cascaded phase-truncated fractional Fourier transforms (FrFTs).
    • Developing a modified method incorporating a logistic map for key generation and reduced key transmission.

    Main Results:

    • Successfully implemented a secure image hiding scheme without information disclosure or post-processing.
    • Achieved efficient determination of phase-only masks (POMs).
    • Demonstrated reduced key transmission through a modified algorithm with logistic map parameters.

    Conclusions:

    • The proposed phase retrieval-based image hiding method is feasible and effective.
    • The modified approach offers enhanced security with reduced key transmission.
    • This technique provides a robust solution for secure optical image hiding.