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Active projection nonlinear γ correction method for fringe projection profilometry.

Lin Wang, Yuetong Zhang, Lina Yi

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |December 15, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an active projection error correction method to improve fringe projection profilometry (FPP) accuracy. The technique corrects nonlinear gamma distortion, enhancing measurement precision even with imperfect projector focus.

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    Area of Science:

    • Optical Metrology
    • 3D Measurement Technologies
    • Image Processing

    Background:

    • Fringe Projection Profilometry (FPP) is sensitive to luminance nonlinearity from projector and camera gamma effects.
    • This nonlinearity distorts fringe intensity, reducing measurement precision and resolution.
    • Existing correction methods often require optimal projector performance, which is difficult with commercial projectors.

    Purpose of the Study:

    • To propose a high-precision, easy-to-implement active projection error correction method for FPP.
    • To develop a technique that is insensitive to projector defocus.
    • To reduce phase measurement errors caused by the nonlinear gamma effect in FPP systems.

    Main Methods:

    • Calibrating the projector to model the optical system's nonlinear gamma response.
    • Performing inverse gamma compensation on projected fringe patterns.
    • Generating and projecting precorrected sinusoidal fringes for camera capture.

    Main Results:

    • Computer simulations and experiments validated the method's effectiveness in estimating and correcting nonlinear gamma distortion.
    • The active projection method significantly suppressed the influence of the system's nonlinear gamma effect on measurement accuracy.
    • High-precision measurements were achieved when compensating for a three-step phase-shift algorithm.

    Conclusions:

    • The proposed active projection error correction method enhances FPP accuracy and resolution.
    • The technique effectively mitigates nonlinear gamma distortion without requiring optimal projector focus.
    • This approach offers a feasible solution for precise 3D measurements in systems affected by luminance nonlinearity.