Titolo:  Experimental analysis of the errors due to polynomial interpolation in digital image correlation
Data di pubblicazione:  2015
Autori: 
Autori:  Baldi A; Bertolino F
Numero degli autori:  2
Lingua:  Inglese
Presenza coautori internazionali:  no
Rivista:  STRAIN
Volume:  51(3)
Pagina iniziale:  248
Pagina finale:  263
Numero di pagine:  16
Digital Object Identifier (DOI):  http://dx.doi.org/10.1111/str.12137
Codice identificativo Scopus:  2-s2.0-84929962220
Codice identificativo ISI:  WOS:000355148000008
Abstract:  Digital image correlation attempts to estimate displacement fields by digitally correlating two images acquired before and after motion. To do so, pixel intensity has to be interpolated at non-integer locations. The ideal interpolator is the sinc, but as it requires infinite support, it is not normally used and is replaced by polynomials. Polynomial interpolation produces visually appealing results but introduces positional errors in the signal, thus causing the digital image correlation algorithms to converge to incorrect results. In this work, an experimental campaign is described, that aims to characterise the errors introduced by interpolation, focusing in particular on the systematic error and the standard deviation of displacements.
Parole Chiave:  digital image correlation; polynomial interpolation; systematic error
Tipologia: 1.1 Articolo in rivista

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