CSI Helsinki: comparing three-dimensional imaging of diagonal cutter toolmarks using confocal microscopy and SWLI

I. Kassamakov; C. Barbeau; S. Lehto; P. Ahvenainen; T. Reinikainen; E. Hæggström

doi:10.1117/12.850046

14 May 2010 CSI Helsinki: comparing three-dimensional imaging of diagonal cutter toolmarks using confocal microscopy and SWLI

I. Kassamakov, C. Barbeau, S. Lehto, P. Ahvenainen, T. Reinikainen, E. Hæggström

Author Affiliations +

Proceedings Volume 7690, Three-Dimensional Imaging, Visualization, and Display 2010 and Display Technologies and Applications for Defense, Security, and Avionics IV; 76900Y (2010) https://doi.org/10.1117/12.850046
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Cutting tools leave characteristic marks that can connect a set of toolmarks to an individual tool. When the depth resolution of an optical microscope is insufficient, more advanced three-dimensional (3D) imaging methods such as Scanning White Light Interferometry (SWLI) and confocal microscopy are required. We cut ten copper wires (2.1±0.1 mm diameter) maintaining a predefined blade orientation and position using diagonal cutting pliers. Images of the sample surfaces were created using equipment based on optical microscopy, SWLI and confocal microscopy. SWLI and confocal microscopy set-ups can produce consistent high-resolution 3D images that are relevant for forensic toolmark comparison.

Citation Download Citation

I. Kassamakov, C. Barbeau, S. Lehto, P. Ahvenainen, T. Reinikainen, and E. Hæggström "CSI Helsinki: comparing three-dimensional imaging of diagonal cutter toolmarks using confocal microscopy and SWLI", Proc. SPIE 7690, Three-Dimensional Imaging, Visualization, and Display 2010 and Display Technologies and Applications for Defense, Security, and Avionics IV, 76900Y (14 May 2010); https://doi.org/10.1117/12.850046

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