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Dual-projector structured light 3D shape measurement.

Ying Yu, Daniel L Lau, Matthew P Ruffner

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    Dual-projector scanning enhances 3D structured light scanning by overcoming single-projector limitations like occlusions and weak signals. This method uses simultaneous projection and temporal-frequency multiplexing for improved accuracy and efficiency.

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    Area of Science:

    • Computer Vision
    • Optical Metrology
    • 3D Imaging

    Background:

    • Structured light scanning (SLS) is an active 3D scanning technique.
    • Single-projector SLS systems suffer from scan occlusions, multi-path interference, and weak signal reflections.

    Purpose of the Study:

    • To propose and evaluate a dual-projector structured light scanning system.
    • To address limitations of single-projector systems in 3D scanning.

    Main Methods:

    • Developed a dual-projector scanning system with various projector/camera arrangements.
    • Employed simultaneous projection from both light engines.
    • Utilized temporal-frequency multiplexing to decouple projected patterns computationally.

    Main Results:

    • Demonstrated minimization of scan occlusions.
    • Achieved higher signal-to-noise ratios (double the brightness of a single projector).
    • Reduced the number of video frames required for scanning.
    • Enabled detection of multi-path interference.

    Conclusions:

    • Dual-projector scanning effectively mitigates occlusion and signal reflection issues in 3D SLS.
    • Simultaneous projection with temporal-frequency multiplexing offers a robust solution for enhanced 3D scanning accuracy and efficiency.