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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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High-frame rate, large-depth-range structured light projector based on the step-designed LED chips array.

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    High-speed phase-shift profilometry (PSP) now offers large depth range using a novel LED array technique. This innovation enables precise 3D measurement of moving objects at high frame rates.

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    Area of Science:

    • Optical Metrology
    • 3D Imaging
    • Computer Vision

    Background:

    • Phase-shift profilometry (PSP) is a precise optical 3D measurement technique.
    • High-speed PSP is a growing research area.
    • Current high-frame rate PSP methods have limited measurement depth due to binary defocusing projection.

    Purpose of the Study:

    • To develop a high-frame rate, large-depth-range sinusoidal fringe projection technique for PSP.
    • To overcome the depth range limitations of existing high-speed PSP methods.

    Main Methods:

    • Proposed a novel sinusoidal fringe projection technique using a step-designed LED chips array.
    • Designed and manufactured a PSP projector based on this technique.
    • Conducted 3D reconstruction experiments with static and dynamic targets at 1 kHz frame rate.
    • Performed fringe projection at 100 kHz frame rate with photodetector validation.

    Main Results:

    • Achieved high-frame rate (1 kHz) 3D reconstruction of a static face mask and a dynamic rotating fan.
    • Demonstrated the potential for frame rates exceeding 100 kHz through photodetector experiments.
    • The technique successfully generates sinusoidal fringes in both focused and defocused states, expanding measurement depth.

    Conclusions:

    • The developed PSP projection technology offers both high-frame rate and large-depth-range capabilities.
    • This technique is highly beneficial for the 3D measurement of dynamic targets.
    • The innovation addresses key limitations in current high-speed PSP systems.