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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Accurate and high-speed 3D surface measurement is critical for diverse applications.
    • Existing binary encoding methods for 3D measurement using digital mirror devices (DMDs) often prioritize speed over accuracy, limiting their practical use.
    • Current limitations hinder the widespread adoption of fast 3D measurement technologies.

    Purpose of the Study:

    • To develop a novel binary encoding method for high-speed and accurate 3D surface measurement.
    • To address the limitations of existing 3D measurement techniques that compromise speed or accuracy.
    • To present an experimental system demonstrating the proposed binary encoding approach.

    Main Methods:

    • Encoding an 8-bit sinusoidal fringe pattern into a sequence of binary patterns using temporal-spatial tactics.
    • High-speed, in-focus projection of the binary pattern sequence onto the object's surface.
    • Temporal-integration imaging to reconstruct a sinusoidal fringe image.
    • Combining phase-shifting techniques with temporal phase unwrapping for 3D reconstruction.

    Main Results:

    • Achieved systematic accuracy better than 0.08mm in 3D surface measurements.
    • Demonstrated the feasibility of the method through measurements of a mask and a palm.
    • Successfully generated a sinusoidal fringe image from a sequence of binary patterns.

    Conclusions:

    • The proposed binary encoding method enables fast and accurate 3D surface measurement.
    • The developed experimental system effectively overcomes the speed-accuracy trade-off in 3D measurement.
    • The technique shows significant potential for applications requiring precise and rapid 3D surface profiling.