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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Updated: May 1, 2026

Lensless Fluorescent Microscopy on a Chip
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Ultra-low-latency 3D measurement with a 1D approximate de Bruijn pattern.

Xiaohang Shi, Qitong Guo, Ruoyu Jia

    Optics Letters
    |May 1, 2025
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    Summary

    We developed a fast 3D imaging system using a novel de Bruijn pattern for ultra-low latency and high precision. This projector-camera system efficiently captures moving objects with impressive accuracy.

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    Area of Science:

    • Computer Vision
    • 3D Imaging Technology
    • Pattern Recognition

    Background:

    • Traditional 3D imaging systems often face trade-offs between speed and precision.
    • Achieving low latency is crucial for capturing dynamic scenes and deformable objects.

    Purpose of the Study:

    • To introduce an ultra-low-latency projector-camera system for high-speed 3D imaging.
    • To leverage the properties of one-dimensional de Bruijn patterns for enhanced performance.

    Main Methods:

    • Utilized a one-dimensional de Bruijn pattern, specifically four 5-bit sequences forming a 7-bit approximate sequence.
    • Implemented GPU acceleration, taking advantage of the pattern's one-dimensional nature.
    • Tested the system on diverse moving and deformable objects with varying material properties.

    Main Results:

    • The system demonstrated excellent performance across various object types and conditions.
    • Achieved an average precision of 0.80 mm and an ultra-low latency of 0.059 ms for planar surfaces.
    • Acquired 120.0K points per image on planar surfaces, balancing code length and decoding speed.

    Conclusions:

    • The proposed de Bruijn pattern-based system offers a significant advancement in 3D imaging speed and accuracy.
    • The system effectively balances precision and decoding speed, making it suitable for dynamic 3D reconstruction.
    • The GPU-accelerated, low-latency approach is highly effective for capturing complex, moving objects.