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Related Experiment Videos

Computational imaging enables a "see-through" lens-less camera.

Ganghun Kim, Rajesh Menon

    Optics Express
    |September 7, 2018
    PubMed
    Summary
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    Researchers developed a novel lens-free imaging technique using scattered light and inverse problem-solving. This method allows image formation through transparent windows, achieving good spatial resolution and demonstrating color and video capabilities.

    Area of Science:

    • Optics and Photonics
    • Computational Imaging

    Background:

    • Conventional cameras require direct line-of-sight, limiting imaging in certain scenarios.
    • Existing imaging systems often involve bulky lenses and complex setups.

    Purpose of the Study:

    • To develop a lens-free imaging system capable of capturing images through a transparent medium.
    • To overcome the limitations of conventional cameras by utilizing scattered light.

    Main Methods:

    • An image sensor was placed at the edge of a transparent window without a lens.
    • Images were formed by collecting scattered light and solving an inverse problem representing light scattering.

    Main Results:

    • Simple images were successfully formed through the transparent window.

    Related Experiment Videos

  • A spatial resolution of approximately 0.1 line-pairs/mm was achieved at a 150mm object distance.
  • A depth-of-focus of at least 10mm was demonstrated.
  • Imaging of an LED array and an LCD screen was shown, including color and video capabilities.

    • Conclusions:

    • The developed lens-free technique enables image formation by capturing scattered light and solving inverse scattering problems.
    • This approach offers a viable alternative to conventional cameras for specific imaging applications.
    • The system demonstrates potential for practical use in color and video imaging through transparent barriers.