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Real-time high dynamic range 3D measurement using fringe projection.

Liang Zhang, Qian Chen, Chao Zuo

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    |September 10, 2020
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    Summary

    This study introduces a high dynamic range fringe projection profilometry (FPP) method for accurate 3D shape measurement. It enhances reflectivity variations, enabling real-time 3D reconstruction of complex surfaces.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Fringe projection profilometry (FPP) is crucial for real-time 3D shape measurement.
    • Standard FPP struggles with objects exhibiting large variations in surface reflectivity.
    • Measuring objects with high dynamic range (HDR) reflectivity poses significant challenges for existing 3D measurement techniques.

    Purpose of the Study:

    • To develop an enhanced FPP method for high dynamic range (HDR) 3D shape measurement.
    • To improve the accuracy and real-time performance of 3D measurements in challenging lighting conditions.
    • To address the limitations of conventional FPP in capturing surfaces with extreme reflectivity variations.

    Main Methods:

    • Utilized binary fringe patterns and defocusing to generate grayscale sinusoidal patterns.
    • Implemented a dual-exposure capture strategy with image fusion to handle varying surface reflectivity.
    • Developed a binocular fringe projection profilometry system and a mixed phase unwrapping method for improved accuracy and speed.

    Main Results:

    • The proposed method successfully increases the dynamic range for real-time 3D measurements.
    • Achieved accurate and robust 3D shape reconstruction for HDR scenes.
    • Demonstrated real-time performance at 28 frames per second.

    Conclusions:

    • The novel FPP approach effectively overcomes reflectivity challenges in 3D measurements.
    • The system provides accurate, real-time 3D data for objects with high dynamic range surfaces.
    • This technique advances the capabilities of FPP for industrial and scientific applications.