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High-speed 3D shape measurement using a rotary mechanical projector.

Yihang Liu, Qican Zhang, Yuankun Liu

    Optics Express
    |March 17, 2021
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    Summary

    A novel fast rotary mechanical projector (RMP) enables high-speed 3D shape measurement. This system uses error diffusion and a probability distribution function (PDF) algorithm to significantly reduce projection errors, enhancing measurement accuracy.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Computer Vision

    Background:

    • High-speed 3D shape measurement is crucial for analyzing dynamic scenes.
    • Existing high-speed projectors often face limitations in projection quality and accuracy.
    • Systemic projection errors can significantly impact the reliability of 3D measurements.

    Purpose of the Study:

    • To design and manufacture a fast rotary mechanical projector (RMP) for high-speed 3D shape measurement.
    • To improve the quality of projected fringes and reduce camera exposure time.
    • To develop and implement an error correction method for enhanced measurement accuracy.

    Main Methods:

    • Development of a fast rotary mechanical projector (RMP) utilizing error diffusion binary coding and chrome plating.
    • Detailed analysis and quantification of systemic projection errors.
    • Implementation of a probability distribution function (PDF) algorithm for error correction.
    • Construction of a monocular measurement system integrating the RMP and a single camera.

    Main Results:

    • The RMP achieves high-quality fringe projection with shorter camera exposure times.
    • The PDF algorithm effectively reduces quantified projection errors by over one third.
    • The integrated RMP and PDF algorithm system demonstrates high accuracy in 3D shape measurement.

    Conclusions:

    • The designed fast rotary mechanical projector (RMP) is suitable for high-speed 3D shape measurement.
    • The combination of the RMP and the PDF error correction algorithm significantly enhances measurement accuracy.
    • The proposed system offers a robust solution for accurate 3D measurement of high-speed dynamic scenes.