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Dong-Uk Kam, Jeong Hee Kim, Kunwoo Lee

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    This study introduces a novel temporal phase unwrapping method for robust 3D scanning. It enhances accuracy by controlling phase errors using k-nearest-neighbor search, improving 3D data point reliability.

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    Area of Science:

    • Optical Metrology
    • 3D Imaging and Scanning

    Background:

    • Phase unwrapping is crucial for accurate 3D reconstruction in optical metrology.
    • Existing methods often struggle with noise and error propagation, limiting scanning robustness.

    Purpose of the Study:

    • To develop a robust temporal phase unwrapping method for enhanced 3D scanning accuracy.
    • To improve the reliability of 3D data points by minimizing phase errors.

    Main Methods:

    • A six-step temporal phase unwrapping process utilizing fringe patterns at multiple phases and frequencies.
    • Application of the k-nearest-neighbor (KNN) search method for flexible error bound control of wrapped phases.
    • Integration of spatial comparison methods to determine accurate fringe orders.

    Main Results:

    • The proposed method successfully generates an unwrapped phase map with improved accuracy.
    • Error bounds of wrapped phases are effectively controlled, enhancing scanning system robustness.
    • Demonstrated superior performance compared to previous phase unwrapping techniques.

    Conclusions:

    • The developed temporal phase unwrapping method significantly enhances the accuracy and robustness of 3D scanning systems.
    • The KNN search and spatial comparison integration offers a flexible and effective approach to phase error correction.
    • This advancement contributes to more reliable 3D data acquisition in optical metrology.