Csi Helsinki: Swli in Forensic Science: Comparing Toolmarks of Diagonal Cutting Pliers

Ahvenainen, Patrik; Kassamakov, I.; Hanhijärvi, Kalle; Aaltonen, Juha; Lehto, Sami; Reinikainen, Tapani; Hæggström, E.; Thompson, Donald O.; Chimenti, Dale E.

doi:10.1063/1.3362387

Cited by 4 publications

(9 citation statements)

References 3 publications

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“…Additionally, 3D imaging techniques do not require any sample preparation. These are non-destructive in nature and are not affected by the type of pen, type and colour of ink, and pen pressure applied while making a fraudulent document (Spagnolo 2006;Ahvenainen et al 2010;Poulin 1996). Study inferences the differences in the school of thoughts on the effect of pen pressure on 3D imaging techniques (Berx and Kinder 2005;Montani et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional detection of sequence of strokes using confocal microscope

Mann

Pathak

Shukla

2019

Egypt J Forensic Sci

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Background: In the present study, three-dimensional application of confocal microscope is explored. The aim is to determine the sequence of intersecting lines written on a questioned document as a non-destructive technique. The authors have tested the Nikon confocal A1 microscope on two major criteria. The criterion 1 focuses on the analysis of homogenous intersecting lines, whereas the criterion 2 focuses on the effect of pen pressure on the sequence of the strokes. Fifty-four and 42 samples from criterion 1 and criterion 2 respectively were examined. All the intersecting strokes were homogeneous and in either black-or blue-coloured ink. They were made from glycolbased (ballpoint pen) and liquid-based (fountain pen and gel pen) inks. Result: The authors were able to determine the correct sequence of homogeneous intersecting lines in 81 and 83% of the average data of samples for criterion 1 (the analysis of homogenous intersecting lines) and criterion 2 (the effect of pen pressure on the sequence of the strokes) respectively. Conclusion: The confocal microscope proved to be a reliable and precise technique for analysing the homogeneous intersected lines made by any pen pressure beyond all the errors during interpretation.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional detection of sequence of strokes using confocal microscope

Mann

Pathak

Shukla

2019

Egypt J Forensic Sci

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“…We address the problem of matching cutter toolmarks on thin mm‐sized wires. These wires are tinier than classically investigated samples , for instance related to burglary. Consequently, issues such as partial marks and strongly curved surfaces become important.…”

Section: Consecutive Matching Striae (Cms) Is a Common Criterium To Tmentioning

confidence: 99%

“…Several 3D imaging methods, for example scanning white light interferometry (SWLI), confocal microscopy (CM), conoscopic holography, and dynamic focusing techniques, have been applied in forensic work , to make comparing samples more efficient than what is currently possible with 2D imaging. Recent articles present CM and SWLI as suitable measurement methods for forensic 3D imaging of toolmarks on metal samples.…”

Section: Consecutive Matching Striae (Cms) Is a Common Criterium To Tmentioning

confidence: 99%

“…Recent articles present CM and SWLI as suitable measurement methods for forensic 3D imaging of toolmarks on metal samples. Although cm‐size samples have been studied extensively and although 3D methods have potential to be used on smaller marks , only few results on cutter marks on thin wires have been published.…”

Section: Consecutive Matching Striae (Cms) Is a Common Criterium To Tmentioning

confidence: 99%

“…Several 3D imaging methods, for example scanning white light interferometry (SWLI), confocal microscopy (CM), conoscopic holography, and dynamic focusing techniques, have been applied in forensic work (1,3,4,6), to make comparing samples more efficient than what is currently possible with 2D imaging. Recent articles (3,6) In three dimensional toolmarks when at least two different groups of at least three consecutive matching striae appear in the same relative position, or one group of six consecutive matching striae are in agreement in an evidence toolmark compared to a test toolmark.…”

Section: Identifying Diagonal Cutter Marks On Thin Wires Using 3d Imamentioning

confidence: 99%

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Identifying Diagonal Cutter Marks on Thin Wires Using 3D Imaging

Heikkinen

Kassamakov

Barbeau

et al. 2013

Journal of Forensic Sciences

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We present work on matching 2-mm-thick wires using optical 3D imaging methods. Marks on such small surfaces are difficult to match using a comparison microscope as this 2D imaging method does not provide height data about the sample surface. Moreover, these 2D microscopy images may be affected by illumination. Hence, the reference and investigated sample should be present at the same time. We employed scanning white light interferometry and confocal microscopy to provide quantitative 3D profiles for reliable comparison of samples that are unavailable for simultaneous analysis. We show that 3D profiling offers a solution by allowing illumination-independent sample comparison. We correctly identified 74 of 80 profiles using consecutive matching striae (CMS) criteria, and we were able to match samples based on profiles measured using different 3D imaging devices. The results suggest that the used methods allow matching cutter marks on thin wires, which has been difficult previously.

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Striated toolmarks comparison and reporting methods: Review and perspectives

Patteet,

Champod

2024

Forensic Science International

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Csi Helsinki: Swli in Forensic Science: Comparing Toolmarks of Diagonal Cutting Pliers

Cited by 4 publications

References 3 publications

Three-dimensional detection of sequence of strokes using confocal microscope

Three-dimensional detection of sequence of strokes using confocal microscope

Identifying Diagonal Cutter Marks on Thin Wires Using 3D Imaging

Striated toolmarks comparison and reporting methods: Review and perspectives

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