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Quaternary Categorization Strategy for Reconstructing High-Reflectivity Surface in Structured Light Illumination.

Bin Xu1, Shangcheng Qu1, Jinhua Li1

  • 1School of Mechanical Engineering, Sichuan University, Chengdu 610065, China.

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|December 23, 2023
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Summary

This study introduces a novel quaternary categorization strategy to overcome challenges in structured light illumination for metal surface defect detection. The method enhances measurement accuracy by addressing high reflectivity and improving noise robustness.

Keywords:
3D measurementdual projectorhigh-reflectivity surfacestructured light illumination

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Area of Science:

  • Metrology
  • Optical Engineering
  • Surface Science

Background:

  • Structured light illumination is crucial for high-speed, precise, non-contact surface defect detection.
  • High reflectivity of metal surfaces commonly causes point cloud loss, degrading measurement accuracy.

Purpose of the Study:

  • To develop a novel strategy for precise measurement of high-reflectivity surfaces using structured light illumination.
  • To address the issue of point cloud loss caused by high surface reflectivity.

Main Methods:

  • A quaternary categorization strategy classifying pixels based on phase map characteristics.
  • Tailored optimization and reconstruction applied to each pixel category.
  • Fusion of point clouds from different pixel types for comprehensive surface reconstruction.

Main Results:

  • The proposed strategy effectively reduces measurement errors associated with high reflectivity on metal surfaces.
  • Demonstrated enhanced robustness against noise compared to conventional methods.
  • Achieved precise point cloud acquisition and reconstruction for challenging surfaces.

Conclusions:

  • The quaternary categorization strategy offers a robust solution for accurate 3D measurements of high-reflectivity surfaces.
  • This method significantly improves the reliability of structured light systems in industrial inspection applications.
  • The approach provides a foundation for advanced non-contact metrology on reflective materials.