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Related Experiment Video

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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Extended depth-of-field stereo imaging system based on high-speed dual cameras embedded with variable focus lenses.

Shuangjiang Huang, Lihui Wang, Yan Hu

    Optics Express
    |February 20, 2026
    PubMed
    Summary

    This study introduces an extended depth-of-field (DoF) vision system using variable-focus lenses for dynamic scenes. It achieves accurate 3D depth measurement in motion, outperforming conventional systems.

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    Area of Science:

    • Computer Vision
    • Optical Engineering
    • 3D Measurement Technology

    Background:

    • Conventional stereoscopic vision systems struggle with extended depth-of-field (DoF) imaging in dynamic scenes.
    • Achieving accurate three-dimensional (3D) depth measurement in motion is challenging for existing systems.

    Purpose of the Study:

    • To develop an extended DoF vision system utilizing variable-focus lenses for dynamic scenes.
    • To enhance 3D depth measurement accuracy and reliability in target motion scenarios.

    Main Methods:

    • Implemented a system with optical-level focal sweeping and computational all-in-focus synthesis.
    • Introduced a temporally adaptive focal calibration model for sub-millisecond focal accuracy (0.45–1.2 m range).
    • Utilized adaptive homography-based multi-plane remapping and sharpness-weighted fusion for image synthesis.

    Main Results:

    • Achieved a 6.2% improvement in depth measurement performance.
    • Optimized the relative depth error rate to 5.82% and reduced RMSE to 0.0505.
    • Demonstrated dynamic extended DoF imaging with preserved high-frequency details.

    Conclusions:

    • The proposed variable-focus lens system enables dynamic extended DoF imaging for 3D depth measurement in motion.
    • The system offers a compact form factor and significant improvements over conventional stereo vision.
    • Potential applications span biomedical imaging, industrial inspection, robotic vision, and AR/VR.