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High-speed 3D measurement using the kinoform array and light source shift.

Weichen Wang, Jiandong Zhan, Yile Shi

    Optics Letters
    |November 1, 2024
    PubMed
    Summary

    A novel kinoform fringe projector enables high-speed 3D measurements. This system achieves 70 frames per second for accurate 3D data acquisition using phase-shifting technology.

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    Area of Science:

    • Optics and Photonics
    • 3D Measurement Technologies
    • Holographic Projection

    Background:

    • Traditional fringe projection systems face limitations in speed and manufacturing complexity.
    • Kinoform-based holography offers a path to simplified fabrication and enhanced performance.
    • High-speed 3D measurement is crucial for dynamic scene analysis and industrial inspection.

    Purpose of the Study:

    • To introduce a new fringe projector utilizing kinoform technology for high-speed 3D measurement.
    • To demonstrate an active binocular 3D measurement system incorporating the novel projector.
    • To develop an efficient binocular matching algorithm for enhanced 3D reconstruction.

    Main Methods:

    • A kinoform array was employed for fringe generation, with phase shifting achieved via light source switching.
    • An active binocular system was constructed using three laser diodes for three-step phase shifting.
    • A coarse-to-fine binocular matching algorithm integrating laser speckle and fringe phase was developed.

    Main Results:

    • The proposed kinoform fringe projector achieved a high switching speed of up to 1.5 kHz.
    • The 3D measurement system demonstrated a measurement speed of 70 frames per second.
    • The system's compact dimensions (30mm x 26mm x 12mm) facilitate integration into various applications.

    Conclusions:

    • The developed kinoform fringe projector offers a viable solution for high-speed, high-resolution 3D measurements.
    • The integration of light source shifting for phase shifting simplifies projector manufacturing and enhances speed.
    • The proposed binocular matching algorithm effectively processes data for accurate 3D reconstruction in dynamic scenarios.