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Dual frequency composite pattern temporal phase unwrapping for 3D surface measurement.

Tao Tang1, Yu Zhang2, Yingying Wan1

  • 1Department of Physical Science and Technology, Southwest Jiaotong University, Chengdu, 610031, China.

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|October 24, 2024
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Summary
This summary is machine-generated.

A new dual-frequency composite-pattern temporal phase unwrapping (TPU) method reduces fringe patterns needed for 3D optical metrology. This efficient technique enables accurate 3D surface reconstruction using only three images.

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Area of Science:

  • Optical Metrology
  • 3D Imaging
  • Computer Vision

Background:

  • Phase shifting profilometry (PSP) is crucial for accurate 3D measurements in engineering and biomedicine.
  • Multi-frequency temporal phase unwrapping (TPU) is vital for discontinuous and isolated surfaces but requires many patterns.

Purpose of the Study:

  • To develop a novel dual-frequency composite-pattern TPU method to reduce the number of fringe patterns required.
  • To enhance measurement efficiency in 3D optical metrology for complex surfaces.

Main Methods:

  • Combines two fringe patterns into three composite patterns.
  • Reconstructs rough 3D points using low-frequency patterns and geometric constraints.
  • Refines low-frequency phase to correct errors and guides high-frequency phase unwrapping.

Main Results:

  • Achieves accurate 3D surface measurement using only three images.
  • Demonstrates significantly improved measurement efficiency compared to traditional methods.
  • Successfully reconstructs accurate 3D points via stereo-vision technology.

Conclusions:

  • The proposed dual-frequency composite-pattern TPU method offers a highly efficient approach for 3D surface measurement.
  • This technique has significant potential for rapid 3D measurement of discontinuous and isolated objects.