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Updated: Mar 3, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Coded aperture correlation holography system with improved performance [Invited].

A Vijayakumar, Yuval Kashter, Roy Kelner

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    Summary
    This summary is machine-generated.

    Noise reduction in coded aperture correlation holography (COACH) is achieved by modifying reconstruction methods and introducing hybrid systems. These advancements improve the performance of COACH for 3D scene recording.

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    Area of Science:

    • Optics and Photonics
    • Digital Holography
    • Image Processing

    Background:

    • Coded aperture correlation holography (COACH) records incoherent digital holograms of 3D scenes using a coded phase mask (CPM).
    • Existing COACH techniques suffer from substantial background noise, limiting their performance.
    • Noise reduction is crucial for enhancing the practical applications of COACH.

    Purpose of the Study:

    • To reduce background noise in COACH systems.
    • To improve the performance and applicability of COACH for 3D imaging.
    • To compare novel noise reduction techniques with existing methods like FINCH and regular imaging.

    Main Methods:

    • Modified hologram reconstruction using a phase-only filter instead of a complex hologram.
    • Integration of a quadratic phase function (from FINCH) with the COACH CPM, creating a hybrid COACH-FINCH system.
    • Recording COACH holograms with multiple independent CPMs and averaging the reconstructed images.

    Main Results:

    • The phase-only filter reconstruction effectively reduces background noise.
    • The hybrid COACH-FINCH system allows a tunable trade-off between noise reduction and axial resolution.
    • Averaging reconstructions from multiple CPMs further diminishes background noise.
    • The proposed methods demonstrate significant noise reduction compared to standard FINCH and regular imaging.

    Conclusions:

    • Modified reconstruction and hybrid systems substantially reduce noise in COACH.
    • The developed techniques enhance the fidelity and utility of incoherent digital holography.
    • These advancements pave the way for more robust 3D imaging using COACH technology.