Authors
Carolina S Silva, Maria Fernanda Pimentel, Ricardo S Honorato, Celio Pasquini, José M Prats-Montalbán, Alberto Ferrer
Publication date
2014
Journal
Analyst
Volume
139
Issue
20
Pages
5176-5184
Publisher
Royal Society of Chemistry
Description
Hyperspectral images in the near infrared range (HSI-NIR) were evaluated as a nondestructive method to detect fraud in documents. Three different types of typical forgeries were simulated by (a) obliterating text, (b) adding text and (c) approaching the crossing lines problem. The simulated samples were imaged in the range of 928–2524 nm with spectral and spatial resolutions of 6.3 nm and 10 μm, respectively. After data pre-processing, different chemometric techniques were evaluated for each type of forgery. Principal component analysis (PCA) was performed to elucidate the first two types of adulteration, (a) and (b). Moreover, Multivariate Curve Resolution–Alternating Least Squares (MCR-ALS) was used in an attempt to improve the results of the type (a) obliteration and type (b) adding text problems. Finally, MCR-ALS and Partial Least Squares–Discriminant Analysis (PLS-DA), employed as a variable …
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