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Related Experiment Video

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A feature fusion-based line structured light 3-D imaging method.

Jingjing Lou1,2, Liangliang Sun1,3, Yunhan Li4

  • 1Shenyang Jianzhu University, Shenyang, 110168, China.

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|October 10, 2025
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Summary

This study introduces a novel line laser 3D measurement method using feature fusion to improve laser stripe center extraction. The method achieves high accuracy, with errors under 1.07 pixels, enhancing industrial measurement precision.

Keywords:
Centerline extractionFeature fusionImage segmentationThree-dimensional measurementWavelet transform

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Area of Science:

  • Computer Vision
  • Metrology
  • Image Processing

Background:

  • Industrial 3D measurement faces challenges with laser stripe extraction due to poor illumination, noise, and low contrast.
  • Accurate laser stripe center extraction is crucial for reliable 3D reconstruction and dimensional analysis.

Purpose of the Study:

  • To develop an advanced line laser 3D measurement method robust to challenging industrial imaging conditions.
  • To enhance the precision and reliability of laser stripe center extraction through feature fusion techniques.

Main Methods:

  • A multi-feature fusion detection model was built to generate brightness and region-enhanced feature maps.
  • Wavelet transform fused these maps, followed by adaptive maximum entropy segmentation.
  • An optimized gray-gravity method and adaptive neighborhood segmentation refined center point determination, with polynomial fitting for final extraction.

Main Results:

  • The method demonstrated high accuracy, with maximum laser stripe extraction error below 1.07 pixels under a noise variance of 0.3.
  • Width error between different rows was less than 0.24 mm.
  • Mean error for repeatability extraction was below 0.13 mm, indicating robust performance.

Conclusions:

  • The proposed feature fusion-based line laser 3D measurement method effectively overcomes illumination and noise issues in industrial settings.
  • The technique offers superior accuracy and repeatability for laser stripe center extraction, benefiting industrial measurement applications.