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ORIGINAL ARTICLE
Year : 2017  |  Volume : 3  |  Issue : 4  |  Page : 210-216

Hyperspectral imaging technology for revealing the original handwritings covered by the same inks


1 Key Laboratory of Evidence Science, China University of Political Science and Law, Ministry of Education; 2011 Collaborative Innovation Center of Judicial Civilization, Beijing 100088; Fada Institute of Forensic Medicine and Science, Beijing 100192, China
2 The Ministry of Public Security Material Evidence Identification Center, Beijing 100038, China

Correspondence Address:
Dr. Yuanyuan Lian
Institute of Evidence Law and Forensic Science, China University of Political Science and Law, Beijing
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jfsm.jfsm_77_17

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This manuscript presents a preliminary investigation on the applicability of hyperspectral imaging technology for nondestructive and rapid analysis to reveal covered original handwritings. The hyperspectral imager Nuance-Macro was used to collect the reflected light signature of inks from the overlapping parts. The software Nuance1p46 was used to analyze the reflected light signature of inks which shows the covered original handwritings. Different types of black/blue ballpoint pen inks and black/blue gel pen inks were chosen for sample preparation. From the hyperspectral images examined, the covered original handwritings of application were revealed in 90.5%, 69.1%, 49.5%, and 78.6% of the cases. Further, the correlation between the revealing effect and spectral characteristics of the reflected light of inks at the overlapping parts was interpreted through theoretical analysis and experimental verification. The results indicated that when the spectral characteristics of the reflected light of inks at the overlapping parts were the same or very similar to that of the ink that was used to cover the original handwriting, the original handwriting could not be shown. On the contrary, when the spectral characteristics of the reflected light of inks at the overlapping parts were different to that of the ink that was used to cover the original handwriting, the original handwriting was revealed.


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