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A Clustered Adaptive Exposure Time Selection Methodology for HDR Structured Light 3D Reconstruction.

Zhuang Li1, Rui Ma1, Shuyu Duan2

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Summary
This summary is machine-generated.

This study introduces an adaptive exposure time method for fringe projection profilometry (FPP) to improve 3D measurements of high-dynamic-range objects. The new approach significantly reduces measurement errors by optimizing exposure settings and phase unwrapping strategies.

Keywords:
exposure fusion selectionfringe projection profilometryhigh dynamic range

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Area of Science:

  • * Optics and Photonics
  • * Metrology and Measurement Science
  • * Computer Vision and Image Processing

Background:

  • * Fringe projection profilometry (FPP) is a key non-contact 3D measurement technique in industry.
  • * High-dynamic-range objects present challenges for FPP, leading to phase computation errors.
  • * Existing FPP methods struggle with objects exhibiting significant variations in reflectivity.

Purpose of the Study:

  • * To develop an adaptive exposure time selection method for FPP.
  • * To enhance phase computation accuracy for high-dynamic-range objects.
  • * To reduce measurement errors in industrial 3D metrology.

Main Methods:

  • * An improved clustering method segments regions based on reflectivity.
  • * Adaptive exposure time selection optimizes the number and duration of exposures.
  • * A phase order sharing strategy is employed during phase unwrapping.
  • * Complementary Gray code patterns are utilized for phase order calculation across exposures.

Main Results:

  • * The proposed method significantly reduces measurement errors.
  • * Experimental results show a 25.4% reduction in measurement error.
  • * The error reduction is achieved with comparable total exposure times.
  • * Improved phase computation accuracy for challenging objects.

Conclusions:

  • * The adaptive exposure time selection method effectively addresses FPP limitations with high-dynamic-range objects.
  • * This technique enhances the precision and reliability of industrial 3D measurements.
  • * The phase order sharing strategy further contributes to accurate phase unwrapping.
  • * The method offers a practical solution for improving FPP performance in complex scenarios.