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Online fringe pitch selection for defocusing a binary square pattern projection phase-shifting method.

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    |October 29, 2020
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    Summary
    This summary is machine-generated.

    This study introduces an online framework for selecting the optimal fringe pitch in 3D shape measurement systems. This method enhances measurement accuracy and robustness by minimizing phase errors without offline calibration.

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    Area of Science:

    • Optics and Photonics
    • Metrology and Measurement Science
    • Computer Vision and Image Processing

    Background:

    • Three-dimensional (3D) shape measurement systems utilizing defocusing binary fringe projection offer high-speed and flexible measurement capabilities.
    • Accurate 3D measurements depend critically on selecting the appropriate fringe pitch that corresponds to the projection's defocus amount.
    • Existing methods often require cumbersome offline calibration, limiting flexibility and efficiency.

    Purpose of the Study:

    • To propose and validate an online framework for selecting the optimal binary fringe pitch in 3D shape measurement.
    • To enhance measurement accuracy and robustness by minimizing normalized phase error.
    • To provide a flexible and efficient alternative to traditional offline calibration methods.

    Main Methods:

    • An online framework for binary fringe pitch selection was developed.
    • Defocus amount is determined by analyzing captured fringe images.
    • A mathematical model of normalized phase error, considering harmonic error and camera noise, is established.
    • The fringe pitch minimizing the normalized phase error is selected as optimal.

    Main Results:

    • The proposed method accurately determines the optimal fringe pitch in real-time.
    • It achieves comparable accuracy to offline calibration methods without requiring prior calibration.
    • Experimental validation demonstrates the method's effectiveness, practicability, flexibility, and efficiency.

    Conclusions:

    • The developed online framework offers a significant advancement in 3D shape measurement technology.
    • It provides a more accurate, robust, flexible, and efficient approach to fringe pitch selection.
    • This method eliminates the need for offline defocus-distance calibration, improving system usability.