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    Single-photon avalanche diode (SPAD) arrays can now achieve higher resolution 3D imaging. A new system uses a CCD camera to enhance SPAD depth images, improving resolution and quality.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Image Processing

    Background:

    • Single-photon avalanche diode (SPAD) arrays are limited by small pixel counts, hindering high-resolution 3D imaging.
    • Existing depth imaging systems often struggle with resolution and quality trade-offs.

    Purpose of the Study:

    • To develop a novel depth imaging system that overcomes the resolution limitations of SPAD arrays.
    • To enhance the resolution and quality of depth images acquired by SPAD arrays using complementary intensity information.

    Main Methods:

    • Established a CCD camera-assisted SPAD array depth imaging system.
    • Utilized a diffractive optical element (DOE) to generate a laser lattice illumination.
    • Implemented a resolution enhancement method combining total generalized variation (TGV) regularization and temporal-spatial (T-S) filtering.

    Main Results:

    • Achieved a 4x4 times increase in the native depth image resolution.
    • Demonstrated significant improvement in the overall depth imaging quality.
    • Successfully registered low-resolution SPAD depth images with high-resolution CCD intensity images.

    Conclusions:

    • The proposed CCD camera-assisted system effectively enhances SPAD depth image resolution.
    • The integration of TGV regularization and T-S filtering is crucial for high-quality depth reconstruction.
    • This approach offers a viable solution for high-resolution 3D imaging applications using SPAD arrays.