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<p>An automated method for estimating Poisson’s ratio using digital image processing of material surface interferograms, including speckle interferograms, was developed. Preliminary image processing using a&#xa0;parameterized retinex was performed to equalize the background, preparing for further segmentation. Image segmentation was carried out using a&#xa0;threshold level that maximizes the dispersion between the two classes. The Poisson coefficient was estimated based on the angle between the asymptotes of the hyperbolas of interference fringes obtained by averaging the edge points of the segmentation results. The method was tested on interferograms of the steel beam surface, obtained under different loads. The application of the technique to difference electronic speckle pattern interferograms of the beam surface made of aluminum alloy is demonstrated. The results of experimental studies demonstrate the advantages of the proposed method.</p>

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Method of digital processing of deformed surface interferograms for estimating Poisson’s ratio

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • I. B. Ivasenko,
  • O. R. Berehulyak,
  • R. A. Vorobel,
  • T. I. Voronyak,
  • I. V. Stasyshyn

摘要

An automated method for estimating Poisson’s ratio using digital image processing of material surface interferograms, including speckle interferograms, was developed. Preliminary image processing using a parameterized retinex was performed to equalize the background, preparing for further segmentation. Image segmentation was carried out using a threshold level that maximizes the dispersion between the two classes. The Poisson coefficient was estimated based on the angle between the asymptotes of the hyperbolas of interference fringes obtained by averaging the edge points of the segmentation results. The method was tested on interferograms of the steel beam surface, obtained under different loads. The application of the technique to difference electronic speckle pattern interferograms of the beam surface made of aluminum alloy is demonstrated. The results of experimental studies demonstrate the advantages of the proposed method.