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Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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Single-pixel shadowless imaging by a ring detector.

Zhong Ji, Hanyan Zhao, Jingyang Xing

    Optics Letters
    |July 1, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel ring detector for active single-pixel imaging, eliminating shadow artifacts. This shadowless imaging technology enhances image quality for medical and industrial applications.

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    Area of Science:

    • Optics and Imaging Technology
    • Photonics
    • Computational Imaging

    Background:

    • Active single-pixel imaging (ASPI) offers advantages but suffers from shadow artifacts due to single light sources.
    • These artifacts degrade image quality, limiting ASPI applications.

    Purpose of the Study:

    • To develop a shadowless imaging technique for active single-pixel imaging systems.
    • To overcome the limitations of single light source dependence in ASPI.

    Main Methods:

    • A ring detector, composed of eight individual detectors, was designed and implemented.
    • Images with varying shadows were captured and combined through signal and image superposition.
    • A simplified method involved connecting detectors in series or parallel for single-acquisition shadowless imaging.
    • Active Bayer-Fourier patterns were integrated with a large-area ring detector for color imaging.

    Main Results:

    • The proposed ring detector effectively eliminated shadow artifacts, improving imaging quality.
    • A simple restoration algorithm successfully separated and reconstructed RGB color components for shadowless color imaging.
    • The technology demonstrated potential for simplified data processing.

    Conclusions:

    • The developed shadowless imaging technology based on a ring detector significantly enhances active single-pixel imaging.
    • This innovation is expected to find broad applications in medical imaging and industrial inspection.