1. Contactless Size Reference in Forensic Photography—Design and Verification of the Novel FreeRef-1 System
- Author
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Luuk A. H. Schiks, Maura Cook, Laurentius R. Lipman, Arjan P. van Dijke, Kim Hutchinson, Paul van den Hoven, and Arjo J. Loeve
- Subjects
measurements ,crime scene investigations ,forensic research ,forensic photography ,Chemical technology ,TP1-1185 - Abstract
In photographs of evidence in forensic investigations, physical size references (e.g., rulers or stickers) are often placed next to a trace to allow us to take measurements from photos. However, this is laborious and introduces contamination risks. The FreeRef-1 system is a contactless size reference system that allows us to take forensic photographs without having to be close to the evidence, and allows photographing under large angles without losing accuracy. The FreeRef-1 system performance was assessed using technical verification tests, inter-observer checks and user tests with forensic professionals. The results show that the measurements taken with photos using the FreeRef-1 system were at least as accurate as those taken using conventional techniques. Furthermore, with the FreeRef-1 system, even photographs taken under strongly oblique angles provided accurate measurements. The results suggest that the FreeRef-1 system will facilitate photographing evidence even in hard-to-reach places, such as under tables and on walls and ceilings, while increasing the accuracy and speed.
- Published
- 2023
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