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    Researchers adapted the shape-from-focus algorithm for real-time 3D terahertz imaging. This method reconstructs object surfaces by analyzing focus positions across multiple images, enabling detailed millimeter-scale imaging.

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    Area of Science:

    • Optics and Photonics
    • Imaging Science
    • Terahertz Technology

    Background:

    • Real-time terahertz imaging has advanced significantly in resolution and quality.
    • Optical microscopy techniques like shape-from-focus are effective for 3D surface reconstruction.
    • Adapting optical methods for terahertz imaging offers new possibilities for millimeter-scale 3D reconstruction.

    Purpose of the Study:

    • To adapt and extend the shape-from-focus algorithm for active, real-time terahertz imaging.
    • To demonstrate the feasibility of reconstructing 3D object shapes using terahertz waves.
    • To leverage advances in terahertz camera technology for 3D imaging applications.

    Main Methods:

    • Utilized the shape-from-focus algorithm, a post-processing technique for optical microscopy.
    • Acquired image stacks at varying distances from the object-side focal plane.
    • Localized the optimal focus position for each pixel to reconstruct the 3D surface.
    • Employed a terahertz waves imaging system with a powerful source and real-time camera.

    Main Results:

    • Successfully achieved experimental 3D reconstruction using the adapted shape-from-focus algorithm.
    • Demonstrated the capability of terahertz imaging for detailed external shape surface reconstruction.
    • Validated the application of an optical 3D imaging method in the terahertz domain.

    Conclusions:

    • The shape-from-focus algorithm is effectively applicable to active and real-time terahertz imaging.
    • This work paves the way for advanced millimeter-scale 3D imaging using terahertz technology.
    • The integration of optical methods with terahertz imaging enhances 3D reconstruction capabilities.