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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Image Processing

    Background:

    • Multispectral and 3-D imaging provide crucial spectral and depth data for diverse applications.
    • Single-photon avalanche diode (SPAD) imaging systems offer photon time-of-arrival data for advanced imaging techniques.

    Purpose of the Study:

    • To develop an LED-based synchronized illumination system for simultaneous multispectral and 3-D imaging.
    • To demonstrate the recovery of reflectance information by linking photon arrival times to specific wavelengths.
    • To achieve centimeter-scale depth resolution using time-correlated single photon counting.

    Main Methods:

    • Utilized a synchronized LED illumination system with temporally structured light.
    • Employed cross-correlation between received multi-peak histograms and reference measurements to determine time delays.
    • Integrated commercial LEDs with a SPAD imaging array for data acquisition across multiple wavelength bands.

    Main Results:

    • Successfully demonstrated multispectral 3-D imaging across 9 visible wavelength bands.
    • Achieved centimeter-scale depth resolution despite using relatively wide (∼10 ns) light pulses.
    • Recovered reflectance information by correlating photon time-of-arrival with specific wavelengths.

    Conclusions:

    • The developed system effectively integrates multispectral and 3-D imaging capabilities.
    • This approach offers a cost-effective and high-resolution method for capturing both spectral and depth information.
    • The technology has potential applications in fields requiring detailed scene analysis.