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Pixel-removing digital image correlation − a universal method for speckle pattern image degradation and cracking
School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China, Shaanxi.
School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China, Shaanxi; Shenzhen Research Institude of Northwestern Polytechnical University, Sanhang Science&Technology Builiding, No.45th, Gaoxin South 9th Road, Nanshan District, Shenzhen 518057, China, No.45th, Gaoxin South 9th Road, Shenzhen.ORCID iD: 0000-0001-8705-2783
School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China, Shaanxi.
School of Power and Energy, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China, Shaanxi.
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2025 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 328, article id 111569Article in journal (Refereed) Published
Abstract [en]

Digital Image Correlation (DIC) typically has poor accuracy when the speckle pattern is degraded, as in cases involving fractures, speckle melting or oxidation in high-temperature measurements, speckle slip, speckle obstruction due to surface roughness, pixel overexposure, or low-quality sensors with dead or defective pixels. We propose a pixel-removing DIC (PR-DIC) method that can accurately match the images with these challenging issues. The PR-DIC dynamically discards unreliable pixels within each subset and keeps only the good pixels for subset matching, enabling a better correlation. Numerical tests shows that PR-DIC has good matching accuracy and efficiency even under severe speckle pattern degradation, which obviously outperforms the classical DIC. A real test of joint root demonstrates reliable performance under practical fracture conditions when the images exhibit severe speckle degradation and crack-induced discontinuities.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 328, article id 111569
Keywords [en]
Digital image correlation, Displacement discontinuity, Pixel-removing DIC, Speckle degradation, Speckle loss, Speckle slip
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-371190DOI: 10.1016/j.engfracmech.2025.111569ISI: 001586089300002Scopus ID: 2-s2.0-105017122396OAI: oai:DiVA.org:kth-371190DiVA, id: diva2:2004214
Note

QC 20251007

Available from: 2025-10-07 Created: 2025-10-07 Last updated: 2025-12-05Bibliographically approved

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Chen, Bin

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