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Related Experiment Video

Updated: Jul 16, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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Time-slicing high dynamic range 3D imaging.

Fanfei Li, Shaohui Zhang, Lusong Li

    Optics Express
    |September 15, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel time-slicing strategy for high dynamic range 3D imaging using fringe projection profilometry (FPP). The method effectively overcomes challenges posed by complex reflectivity, enabling accurate 3D measurements in demanding environments.

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    Area of Science:

    • Optical Metrology
    • 3D Imaging
    • Computer Vision

    Background:

    • Fringe projection profilometry (FPP) is a key non-contact 3D measurement technique.
    • Measuring objects with complex reflectivity presents challenges due to extreme light intensity variations.
    • Existing FPP methods struggle with scenes where the dynamic range exceeds image detector capabilities.

    Purpose of the Study:

    • To develop a high dynamic range 3D imaging strategy for fringe projection profilometry.
    • To address limitations of FPP in measuring scenes with complex and varying reflectivity.
    • To enhance the efficiency and accuracy of 3D reconstruction for challenging surfaces.

    Main Methods:

    • A time-slicing strategy is proposed, utilizing short, equal exposure times for projected sinusoidal fringe patterns.
    • Fusion of multiple short-exposure images is performed based on local gray-value distribution for HDR imaging.
    • Complementary Gray code patterns are employed for robust phase unwrapping, insensitive to sensor nonlinearities.

    Main Results:

    • The proposed time-slicing strategy successfully achieves high dynamic range 3D imaging.
    • Phase unwrapping using complementary Gray codes improves measurement efficiency and robustness.
    • Experimental validation demonstrates the feasibility and effectiveness of the developed method.

    Conclusions:

    • The novel time-slicing approach significantly enhances FPP's capability for 3D measurement in complex reflectivity scenes.
    • The combination of HDR imaging and efficient phase unwrapping offers a practical solution for advanced 3D metrology.
    • This method provides a reliable and efficient tool for accurate 3D reconstruction in challenging industrial and scientific applications.