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Two improved algorithms with which to obtain contoured windows for fringe patterns generated by electronic

Qifeng Yu1, Xia Yang, Sihua Fu

  • 1College of Optical Engineering, College of Astronautics, National University of Defense Technology, Changsha, Hunan 410073, China. yuqifeng@vip.sina.com

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Summary

This study introduces advanced methods for filtering speckle noise in electronic speckle-pattern interferometry fringe patterns. New algorithms precisely determine contoured windows, improving fringe pattern analysis and reducing errors.

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Area of Science:

  • Optical Metrology
  • Image Processing

Background:

  • Electronic speckle-pattern interferometry (ESPI) generates fringe patterns with significant speckle noise.
  • Existing contoured window filtering methods can lead to accumulated errors due to reliance on fringe orientation alone.

Purpose of the Study:

  • To develop novel algorithms for more accurate determination of contoured windows in ESPI fringe pattern analysis.
  • To improve the filtering of speckle noise while preserving fringe pattern integrity.

Main Methods:

  • Proposed two new algorithms for contoured window determination.
  • Algorithms utilize fringe intensity slope and distance ratio to neighboring skeletons.
  • These methods aim for more precise window definition compared to previous orientation-based approaches.

Main Results:

  • The new algorithms provide more precise determination of contoured windows.
  • Improved filtering of speckle noise is achieved.
  • Enhanced accuracy in deriving smooth, normalized, and consistent fringe patterns.

Conclusions:

  • The proposed algorithms offer a significant improvement for speckle noise reduction in ESPI.
  • Precise contoured window determination is crucial for accurate fringe pattern analysis.
  • These techniques enhance the reliability of the contoured correlation fringe pattern method.