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Related Experiment Video

Updated: May 7, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Lensless object scanning holography for two-dimensional mirror-like and diffuse reflective objects.

Vicente Micó, Carlos Ferreira, Javier García

    Applied Optics
    |October 3, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Lensless Object Scanning Holography (LOSH) enhances digital holography for 1D and 2D objects. This lensless technique improves image resolution, field-of-view, and signal-to-noise ratio through digital postprocessing.

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    08:41

    Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

    Published on: August 16, 2012

    Area of Science:

    • Optics and Photonics
    • Digital Holography
    • Image Processing

    Background:

    • Lensless Object Scanning Holography (LOSH) offers a simplified setup for 1D reflective objects.
    • Existing LOSH improves resolution, field-of-view (FOV), signal-to-noise ratio (SNR), and depth of field via digital Fourier holograms.
    • Speckle noise typically affects image resolution in diffuse-based object imaging.

    Purpose of the Study:

    • Extend LOSH methodology to two-dimensional (2D) mirror-like and 1D diffuse-based objects.
    • Investigate the impact of aperture size on speckle reduction for 1D diffuse objects.
    • Explore different digital processing techniques for synthetic image generation.

    Main Methods:

    • Recording and digital postprocessing of lensless Fourier transform holograms.
    • Application of LOSH to 2D mirror-like objects.
    • Analysis of speckle effects and application of incoherent, coherent, and partially coherent processing for 1D diffuse objects.

    Main Results:

    • Achieved a threefold improvement in FOV, SNR, and resolution for 2D mirror-like objects.
    • Demonstrated that increasing aperture size decreases speckle size in 1D diffuse objects.
    • Partially coherent processing yielded the best resolution improvement for 1D diffuse objects.

    Conclusions:

    • LOSH is effectively extended to 2D mirror-like and 1D diffuse objects, significantly enhancing image quality.
    • Speckle reduction and optimized digital processing are crucial for high-resolution imaging of diffuse objects.
    • The study validates LOSH as a versatile lensless imaging technique with broad applicability.