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Research on a Handheld 3D Laser Scanning System for Measuring Large-Sized Objects.

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This study introduces a handheld 3D laser scanning system for on-site measurement of large objects. The system achieves acceptable accuracy for large-scale 3D reconstruction, overcoming limitations of existing methods.

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binocular stereo visionhandheld 3D measurement systemlarge-sized objectmeasurement on sitestructured light

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Area of Science:

  • Engineering
  • Computer Vision
  • Metrology

Background:

  • Accurate 3D measurement of large objects on-site is challenging.
  • Existing systems often suffer from sheltering and limited measuring ranges.

Purpose of the Study:

  • To develop and validate a handheld 3D laser scanning system for on-site measurement of large objects.
  • To achieve accurate 3D reconstruction with improved accessibility.

Main Methods:

  • A handheld system combining binocular stereo vision and structured light principles.
  • Online position evaluation using marked points and a TRITOP system.
  • 3D information reconstruction in a fixed workpiece coordinate system.

Main Results:

  • Distance errors between measured balls within ±0.05 mm.
  • Radius errors of balls within ±0.04 mm.
  • Scatter point errors within ±0.25 mm without accumulated errors.

Conclusions:

  • The proposed system accurately measures large-sized objects on-site.
  • The system overcomes limitations like sheltering and restricted measuring range.
  • Offers a viable solution for industrial 3D metrology applications.