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Phase retrieval for dual-projection pattern based on orthogonal frequency encoding to suppress superposing effects.

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    This study introduces orthogonal grating encoding to accurately retrieve phases from superposed grating patterns in dual-projection systems. This novel method overcomes blur and overexposure for precise 3D reconstruction.

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    Area of Science:

    • Optical Metrology
    • 3D Reconstruction
    • Computer Vision

    Background:

    • Structured-light systems project patterns for 3D measurement.
    • Simultaneous projection in dual-systems causes interference, blur, and overexposure.
    • Phase miscalculation hinders accurate 3D reconstruction.

    Purpose of the Study:

    • To develop a novel method for accurate phase retrieval from superposed grating patterns.
    • To address challenges of interference-like blur and brightness overexposure in dual-projection systems.
    • To enable high-precision 3D reconstruction from simultaneous multiprojection.

    Main Methods:

    • Utilized orthogonal grating encoding for signal separation.
    • Determined pattern frequency based on wireless communication signal separation principles.
    • Applied discrete Fourier transform to superposed grating patterns for phase retrieval.
    • Reconstructed 3D objects by fusing point clouds from dual-projection.

    Main Results:

    • Successfully eliminated interference-like blurring and brightness overexposure.
    • Achieved high-precision phase maps from superposed grating patterns.
    • Demonstrated accurate 3D reconstruction of measured objects.
    • Validated the effectiveness of orthogonal grating encoding for simultaneous projection.

    Conclusions:

    • Orthogonal grating encoding is a viable method for accurate phase retrieval in dual-projection structured-light systems.
    • The proposed technique overcomes limitations of simultaneous pattern projection.
    • This advancement facilitates high-precision 3D reconstruction and opens possibilities for multiprojection systems.