Forensic discrimination of blue ballpoint pen inks based on thin layer chromatography and image analysis

被引:62
作者
Djozan, Djavanshir [1 ]
Baheri, Tahmineh [1 ,2 ]
Karimian, Ghader [3 ]
Shahidi, Masomeh [1 ]
机构
[1] Univ Tabriz, Fac Chem, Tabriz, Iran
[2] Res Ctr Criminal Police, Tabriz, Iran
[3] Univ Tabriz, Fac Elect & Comp Engn, Tabriz, Iran
关键词
thin layer chromatography; image analysis; ink analysis; TLC evaluation;
D O I
10.1016/j.forsciint.2008.05.013
中图分类号
DF [法律]; D9 [法律]; R [医药、卫生];
学科分类号
0301 ; 10 ;
摘要
This article aims to provide a new and fast method for differentiation of inks on a questioned document. The data acquisition was carried out by designing specific image analysis software for evaluating thin layer chromatograms (TLC-IA). The ink spot was extracted from the document using methanol and seperated by TLC using plastic sheet silica gel 60 without fluorescent indicator, and a mixture of ethyl acetate, ethanol, and water (70:35:30, v/v/v) as mobile phase. To discriminate between different pen inks, new software was designed on the basis of intensity profile or red, green, and blue (RGB) characteristic. In practice, after development of chromatogram, the chromatograms were scanned by ordinary office scanner, intensity profiles of RGB characteristics on the development straight of each sample were produced and compared with the mentioned software. RGB profiles of ballpoint inks from various manufacturers showed that the patterns in most cases were distinctly different from each other. This new method allowed discriminating among different pen inks with a high reliability and the discriminating power of 92.8%. Blue ballpoint pen inks of 41 different samples available on the local market were successfully analyzed and discriminated. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:199 / 205
页数:7
相关论文
共 29 条
[1]  
*ASTM INT, 2000, ANN BOOK ASTM STAND, P740
[2]   Using Raman Spectroscopy to solve crime: inks, questioned documents and fraud [J].
Claybourn, M ;
Ansell, M .
SCIENCE & JUSTICE, 2000, 40 (04) :261-271
[3]   Online selection of discriminative tracking features [J].
Collins, RT ;
Liu, YX ;
Leordeanu, M .
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, 2005, 27 (10) :1631-1643
[4]   Image indexing using color correlograms [J].
Huang, J ;
Kumar, SR ;
Mitra, M ;
Zhu, WJ ;
Zabih, R .
1997 IEEE COMPUTER SOCIETY CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION, PROCEEDINGS, 1997, :762-768
[5]   Evaluation of quantitative thin layer chromatography using staining reagents [J].
Johnsson, Richard ;
Traff, Gustav ;
Sunden, Martin ;
Ellervik, Ulf .
JOURNAL OF CHROMATOGRAPHY A, 2007, 1164 (1-2) :298-305
[6]  
Lewis JA, 1996, J FORENSIC SCI, V41, P874
[7]  
LUKAC R, 2006, PLATANIOTIS IMAGE PR
[8]  
MANJUNATH S, 2001, P 2001 IEEE T CIRC S, P703
[9]  
Nath B. A., 2007, INT C IM PROC ICIP, V5, P521
[10]  
Orfanidis S. J., 1996, Optimum Signal Processing: An Introduction, V2nd