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Empirical Evaluation of the Reliability of Photogrammetry Software in the Recovery of Three-Dimensional Footwear Impressions.

Larsen, H. J. and Bennett, M. R., 2020. Empirical Evaluation of the Reliability of Photogrammetry Software in the Recovery of Three-Dimensional Footwear Impressions. Journal of Forensic Sciences. (In Press)

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DOI: 10.1111/1556-4029.14455

Abstract

This paper examines the reliability of Structure from Motion (SfM) photogrammetry as a tool in the capture of forensic footwear marks. This is applicable to photogrammetry freeware DigTrace but is equally relevant to other SfM solutions. SfM simply requires a digital camera, a scale bar, and a selection of oblique photographs of the trace in question taken at the scene. The output is a digital three-dimensional point cloud of the surface and any plastic trace thereon. The first section of this paper examines the reliability of photogrammetry to capture the same data when repeatedly used on one impression, while the second part assesses the impact of varying cameras. Using cloud to cloud comparisons that measure the distance between two-point clouds, we assess the variability between models. The results highlight how little variability is evident and therefore speak to the accuracy and consistency of such techniques in the capture of three-dimensional traces. Using this method, 3D footwear impressions can, in many substrates, be collected with a repeatability of 97% with any variation between models less than ~0.5 mm.

Item Type:Article
ISSN:0022-1198
Additional Information:This research is a part of an on‐going project originally funded by the U.K. Natural Environment Research Council Grant Number NE/M021459/1.
Uncontrolled Keywords:3D ; digital evidence ; evidence recovery ; footwear impression ; reliability testing ; three-dimensional ; validity
Group:Faculty of Science & Technology
ID Code:34012
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:19 May 2020 08:49
Last Modified:19 May 2020 08:49

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