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Reference image based phase unwrapping framework for a structured light system.

Wei Bao, Xu Xiao, Yuhua Xu

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    Summary
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    This study introduces a new real-time 3D shape measurement method using structured light systems. The novel framework achieves fast and accurate absolute 3D shape reconstruction with only four patterns.

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    Area of Science:

    • Computer Vision
    • Optical Metrology
    • 3D Reconstruction

    Background:

    • Structured light systems are crucial for 3D shape measurement.
    • Phase unwrapping is a key challenge in achieving accurate 3D reconstruction.
    • Existing methods often require numerous patterns or complex setups.

    Purpose of the Study:

    • To develop a novel real-time full-field phase unwrapping framework.
    • To enable absolute 3D shape measurement using a simplified structured light system.
    • To improve the efficiency and accuracy of 3D reconstruction.

    Main Methods:

    • Proposed a one-projector, one-camera structured light system.
    • Utilized four patterns: three fringe and one binary speckle.
    • Employed a speckle image as a reference for absolute phase mapping.
    • Developed a matching algorithm for real-time correspondence.

    Main Results:

    • Achieved absolute 3D shape measurement with high accuracy.
    • Demonstrated real-time performance at 187 frames per second on a consumer GPU.
    • Verified effectiveness and efficiency through experimental results.

    Conclusions:

    • The proposed framework offers an efficient and effective solution for real-time 3D shape measurement.
    • The method simplifies the process by reducing the number of required patterns.
    • This advancement has potential applications in various fields requiring rapid 3D scanning.