Pixel-removing digital image correlation − a universal method for speckle pattern image degradation and crackingShow others and affiliations
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
2025-10-072025-10-072025-12-05Bibliographically approved