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Updated: Sep 11, 2025

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    Area of Science:

    • Optics and Photonics
    • Computational Imaging
    • Phase Contrast Microscopy

    Background:

    • Ghost imaging and holography enable non-local imaging.
    • Dual-arm phase contrast imaging can extract target edges, avoiding full reconstruction.
    • Existing methods rely on cameras or scanning.

    Purpose of the Study:

    • To propose a computational dual-arm phase contrast imaging scheme.
    • To combine spiral phase contrast imaging with ghost imaging.
    • To enable efficient imaging with single-point detection.

    Main Methods:

    • Fourier basis modulation under speckle illumination.
    • Integration of spiral phase contrast with ghost imaging.
    • Single-point detection in both imaging arms.
    • Compressed sampling implementation.

    Main Results:

    • Experimental and simulation results validate the proposed scheme.
    • Effective implementation demonstrated under compressed sampling.
    • Investigated speckle coherence length and number effects on accuracy and SNR.

    Conclusions:

    • The proposed computational scheme offers a simplified approach to dual-arm phase contrast imaging.
    • The method is effective even with compressed sampling.
    • Understanding speckle properties is crucial for optimizing edge extraction and image quality.