ORBi: Lecompte D. - Quality assessment of speckle patterns for digital image correlation

Reference : Quality assessment of speckle patterns for digital image correlation


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering
	To cite this reference:	http://hdl.handle.net/2268/15779

Title :	Quality assessment of speckle patterns for digital image correlation
Language :	English
Author, co-author :	Lecompte, D. [ > > ]
	Smits, A. [ > > ]
	Bossuyt, Sven [ > > ]
	Sol, Hugo [ > > ]
	Vantomme, J. [ > > ]
	Van Hemelrijck, D. [ > > ]
	Habraken, Anne [Université de Liège - ULg > Département ArGEnCo > Département ArGEnCo >]
Publication date :	2006
Journal title :	Optics & Lasers in Engineering
Publisher :	Elsevier Science
Volume :	44
Issue/season :	11
Pages :	1132-1145
Audience :	International
ISSN :	0143-8166
City :	Oxford
Country :	United Kingdom
Keywords :	[en] Digital image correlation ; Speckle pattern ; Displacement field
Abstract :	[en] Digital image correlation (DIC) is an optical–numerical full-field displacement measuring technique, which is nowadays widely used in the domain of experimental mechanics. The technique is based on a comparison between pictures taken during loading of an object. For an optimal use of the method, the object of interest has to be covered with painted speckles. In the present paper, a comparison is made between three different speckle patterns originated by the same reference speckle pattern. A method is presented for the determination of the speckle size distribution of the speckle patterns, using image morphology. The images of the speckle patterns are numerically deformed based on a finite element simulation. Subsequently, the displacements are measured with DIC-software and compared to the imposed ones. It is shown that the size of the speckles combined with the size of the used pixel subset clearly influences the accuracy of the measured displacements.
Permalink :	http://hdl.handle.net/2268/15779
DOI :	10.1016/j.optlaseng.2005.10.004
Other URL :	http://dx.doi.org/10.1016/j.optlaseng.2005.10.004

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