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Related Experiment Video

Updated: Jun 6, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Large-depth-range 3D measurement based on optimized multi-focal projection system.

Weihang Zhang, Sijie Zhu, Chenxun Ran

    Optics Express
    |November 22, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optimized multi-focal projection system using a cylindrical lens to enhance 3D measurement technology. The new system significantly expands the measurable depth range while maintaining high-speed performance.

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    Area of Science:

    • Optics and Photonics
    • Metrology and Measurement Science

    Background:

    • High-speed and large-depth-range 3D measurement is crucial across various industries.
    • Conventional binary defocusing methods face limitations in depth range due to insufficient defocusing near the focal plane.

    Purpose of the Study:

    • To overcome the depth range limitations of conventional 3D measurement techniques.
    • To propose an optimized multi-focal projection system for enhanced 3D measurement.

    Main Methods:

    • Introduction of a cylindrical lens with optimal parameter configuration into a projection system.
    • Modulating the defocusing kernel distribution and removing limitations of the defocusing region.

    Main Results:

    • Achieved high-quality sinusoidal fringe patterns over an extended depth range.
    • Increased the depth range from 150 mm to 725 mm compared to conventional single-focal systems.

    Conclusions:

    • The proposed multi-focal projection system effectively expands the depth range for high-speed 3D measurement.
    • Optimal parameter configuration of the cylindrical lens is key to enhancing measurement performance.