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Related Concept Videos

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Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
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In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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Related Experiment Video

Updated: Jul 4, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Phase-aided online self-correction method for high-accuracy three-dimensional measurement.

Xiaojie Zhang, Ziwei Wang, Zewei Cai

    Optics Express
    |February 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an online self-correction method for binocular structured light 3D measurement systems. The novel approach ensures high accuracy even with unstable structures, improving industrial inspection reliability.

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    Area of Science:

    • Metrology and Measurement Science
    • Optical Engineering
    • Computer Vision

    Background:

    • Binocular structured light 3D measurement systems are crucial for industrial inspection but suffer from instability due to mechanical or environmental factors.
    • Traditional methods struggle with self-correction of structural changes, impacting online measurement accuracy.
    • Maintaining system integrity is essential for reliable in situ shape measurement.

    Purpose of the Study:

    • To develop an online self-correction method for binocular structured light 3D measurement systems.
    • To address the challenge of structural instability in industrial inspection and shape measurement.
    • To enhance the accuracy and reliability of 3D measurements in dynamic environments.

    Main Methods:

    • Proposed an online self-correction method utilizing orthogonal fringe projection.
    • Leveraged bidirectional phases from orthogonal fringe projection to relax epipolar geometry constraints.
    • Implemented a phase unwrapping strategy to reduce projection patterns and improve efficiency.

    Main Results:

    • The proposed method effectively corrects for online self-correction of unstable system structures.
    • Achieved high-accuracy 3D measurement even under complex and disturbed environmental conditions.
    • Demonstrated the robustness of the orthogonal fringe projection technique for dynamic measurements.

    Conclusions:

    • The developed method provides an effective solution for online self-correction in unstable 3D measurement systems.
    • Orthogonal fringe projection offers advantages in overcoming structural variations for accurate 3D measurements.
    • The technique enhances the applicability of binocular structured light systems in challenging industrial settings.