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Absolute three-dimensional shape measurement using coded fringe patterns without phase unwrapping or projector

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    This study introduces a new 3D shape measurement technique that avoids complex phase unwrapping and projector calibration. It achieves high-quality results even with low-quality fringe patterns.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Absolute three-dimensional (3D) shape measurement is crucial in various scientific and industrial fields.
    • Existing stereo-phase methods often require complex phase unwrapping and projector calibration, limiting their practical application.

    Purpose of the Study:

    • To develop a novel stereo-phase-based absolute 3D shape measurement method.
    • To eliminate the need for phase unwrapping and projector calibration.
    • To achieve accurate 3D measurements even with low-quality fringe patterns.

    Main Methods:

    • A two-step approach: first, obtaining a coarse disparity map from a quality map.
    • Second, refining the disparity map using wrapped phase information.
    • Fringe patterns are modified to encode a quality map for efficient and accurate stereo matching.

    Main Results:

    • The proposed method successfully performs absolute 3D shape measurement without phase unwrapping or projector calibration.
    • High-quality 3D measurement results were achieved, even when using extremely low-quality fringe patterns.
    • Demonstrated the effectiveness of encoding quality information within fringe patterns for robust stereo matching.

    Conclusions:

    • The novel stereo-phase method offers a simplified and robust approach to absolute 3D shape measurement.
    • This technique has the potential to broaden the applicability of 3D shape measurement in challenging environments.
    • The method provides a significant advancement in non-contact 3D metrology.