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Proceedings Paper

Computer-aided fiber analysis for crime scene forensics
Author(s): Mario Hildebrandt; Christian Arndt; Andrey Makrushin; Jana Dittmann
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Paper Abstract

The forensic analysis of fibers is currently completely manual and therefore time consuming. The automation of analysis steps can significantly support forensic experts and reduce the time, required for the investigation. Moreover, a subjective expert belief is extended by objective machine estimation. This work proposes the pattern recognition pipeline containing the digital acquisition of a fiber media, the pre-processing for fiber segmentation, and the extraction of the distinctive characteristics of fibers. Currently, basic geometrical features like width, height, area of optically dominant fibers are investigated. In order to support the automatic classification of fibers, supervised machine learning algorithms are evaluated. The experimental setup includes a car seat and two pieces clothing of a different fabric. As preliminary work, acrylic as synthetic and sheep wool as natural fiber are chosen to be classified. While sitting on the seat, a test person leaves textile fibers. The test aims at automatic distinguishing of clothes through the fiber traces gained from the seat with the help of adhesive tape. The digitalization of fiber samples is provided by a contactless chromatic white light sensor. First test results showed, that two optically very different fibers can be properly assigned to their corresponding fiber type. The best classifier achieves an accuracy of 75 percent correctly classified samples for our suggested features.

Paper Details

Date Published: 10 February 2012
PDF: 14 pages
Proc. SPIE 8296, Computational Imaging X, 829608 (10 February 2012); doi: 10.1117/12.909852
Show Author Affiliations
Mario Hildebrandt, Otto-von-Guericke-Univ. of Magdeburg (Germany)
Christian Arndt, Brandenburg Univ. of Applied Sciences (Germany)
Andrey Makrushin, Otto-von-Guericke-Univ. of Magdeburg (Germany)
Brandenburg Univ. of Applied Sciences (Germany)
Jana Dittmann, Otto-von-Guericke-Univ. of Magdeburg (Germany)

Published in SPIE Proceedings Vol. 8296:
Computational Imaging X
Charles A. Bouman; Ilya Pollak; Patrick J. Wolfe, Editor(s)

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