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High-precision real-time 3D shape measurement using a bi-frequency scheme and multi-view system.

Tianyang Tao, Qian Chen, Shijie Feng

    Applied Optics
    |May 3, 2017
    PubMed
    Summary

    A novel bi-frequency phase-shifting technique enhances 3D shape measurement speed and precision. This method uses multi-view fringe projection to achieve high-frequency phase unwrapping, enabling 300 fps measurements with 50 μm precision.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • High-speed, high-precision 3D shape measurement is crucial for applications like automated inspection and robotics.
    • Conventional fringe projection profilometry faces speed-precision trade-offs due to fringe density and phase unwrapping limitations.
    • Current real-time systems often limit fringe frequency (<30) for reliable phase unwrapping.

    Purpose of the Study:

    • To introduce a bi-frequency phase-shifting technique for enhanced 3D shape measurement.
    • To overcome the speed-precision limitations of conventional fringe projection methods.
    • To achieve high-speed and high-precision 3D measurements without compromising accuracy.

    Main Methods:

    • A multi-view fringe projection system utilizing bi-frequency phase-shifting is proposed.
    • Geometric constraints in the multi-view system enable direct unwrapping of low-frequency (10-period) fringes.
    • This low-frequency phase map serves as a reference for unwrapping high-frequency (160-period) fringe phase maps.
    • The technique accommodates slightly defocused projections for increased speed.

    Main Results:

    • The proposed method achieves high-speed 3D measurement at 300 frames per second.
    • High measurement precision of approximately 50 μm is demonstrated.
    • Successful validation on both static and dynamic scenes confirms the method's efficacy.

    Conclusions:

    • The bi-frequency phase-shifting technique significantly enhances 3D shape measurement precision and speed.
    • This approach effectively addresses the limitations of conventional methods in real-time applications.
    • The system offers a robust solution for demanding 3D measurement tasks.