Print Email Facebook Twitter Contactless Size Reference in Forensic Photography Title Contactless Size Reference in Forensic Photography: Design and Verification of the Novel FreeRef-1 System Author Schiks, L.A.H. (TU Delft Medical Instruments & Bio-Inspired Technology) Cook, M.S. (TU Delft Medical Instruments & Bio-Inspired Technology; Universiteit van Amsterdam) Lipman, L.R. (Student TU Delft) van Dijke, A.P. (TU Delft Medical Instruments & Bio-Inspired Technology; Netherlands Forensic Institute - NFI) Hutchinson, K. (TU Delft Medical Instruments & Bio-Inspired Technology) van den Hoven, Paul (Netherlands Forensic Institute - NFI) Loeve, A.J. (TU Delft Medical Instruments & Bio-Inspired Technology) Date 2023 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. Subject measurementscrime scene investigationsforensic researchforensic photography To reference this document use: http://resolver.tudelft.nl/uuid:38720e27-3f13-449f-af27-a710631145e5 DOI https://doi.org/10.3390/s23083790 ISSN 1424-8220 Source Sensors, 23 (8) Part of collection Institutional Repository Document type journal article Rights © 2023 L.A.H. Schiks, M.S. Cook, L.R. Lipman, A.P. van Dijke, K. Hutchinson, Paul van den Hoven, A.J. Loeve Files PDF sensors_23_03790.pdf 14.72 MB Close viewer /islandora/object/uuid:38720e27-3f13-449f-af27-a710631145e5/datastream/OBJ/view