Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/85673
Type: Artigo de periódico
Title: Near Infrared Hyperspectral Imaging For Forensic Analysis Of Document Forgery
Author: Silva C.S.
Pimentel M.F.
Honorato R.S.
Pasquini C.
Prats-Montalban J.M.
Ferrer A.
Abstract: 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 selection tool, were used to study the type (c) forgeries, i.e. crossing lines problem. Type (a) forgeries (obliterating text) were successfully identified in 43% of the samples using both the chemometric methods (PCA and MCR-ALS). Type (b) forgeries (adding text) were successfully identified in 82% of the samples using both the methods (PCA and MCR-ALS). Finally, type (c) forgeries (crossing lines) were successfully identified in 85% of the samples. The results demonstrate the potential of HSI-NIR associated with chemometric tools to support document forgery identification. This journal is
Editor: Royal Society of Chemistry
Rights: aberto
Identifier DOI: 10.1039/c4an00961d
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84907829228&partnerID=40&md5=069a6841b870f5b9216c1656ce172408
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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