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Updated: Oct 17, 2025

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Noniterative sub-pixel shifting super-resolution lensless digital holography.

Heejung Lee, JongWu Kim, JunWoo Kim

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    This study introduces a fast, noniterative super-resolution technique to double the resolution of lensless digital holography (LDH). The method overcomes LDH

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    Area of Science:

    • Optics and Photonics
    • Digital Imaging
    • Holography

    Background:

    • Lensless digital holography (LDH) offers a simple setup, wide field-of-view, and 3D imaging capabilities.
    • The resolution of LDH is fundamentally limited by the detector array's Nyquist frequency, hindering its application.
    • Previous research focused on enhancing LDH resolution, but limitations persist.

    Purpose of the Study:

    • To propose and demonstrate a novel, fast, noniterative super-resolution technique for LDH.
    • To enhance the resolution of lensless digital holography by a factor of two.
    • To provide a theoretical framework and experimental validation for the proposed method.

    Main Methods:

    • Development of a noniterative, sub-pixel shifting super-resolution algorithm.
    • Derivation of detailed frequency-domain formulae for the super-resolution method.
    • Experimental validation using both scattering and phase objects.

    Main Results:

    • Successfully enhanced the resolution of lensless digital holography by a factor of two.
    • Demonstrated the effectiveness of the fast, noniterative approach.
    • Validated the method's applicability to diverse object types.

    Conclusions:

    • The proposed noniterative super-resolution technique significantly improves LDH resolution.
    • This method offers a practical solution to a major limitation of lensless digital holography.
    • The technique is suitable for real-time or near-real-time super-resolution imaging applications.