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Contactless Size Reference in Forensic Photography-Design and Verification of the Novel FreeRef-1 System
Luuk A H Schiks1, Maura Cook1,2, Laurentius R Lipman1
1Department of Biomechanical Engineering, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Room F-0-200, Mekelweg 2, 2628 CD Delft, The Netherlands.
Sensors (Basel, Switzerland)
|April 28, 2023
Summary
The FreeRef-1 system offers contactless size referencing for forensic photography, improving accuracy and speed. This innovation reduces contamination risks and allows clear measurements from difficult angles.
Area of Science:
- Forensic Science
- Imaging Technology
- Measurement Science
Background:
- Traditional forensic photography relies on physical size references, which are laborious and pose contamination risks.
- Accurate measurements from photographs are crucial for evidence analysis in forensic investigations.
Purpose of the Study:
- To introduce and evaluate the FreeRef-1 system, a contactless size reference for forensic photography.
- To assess the accuracy and usability of the FreeRef-1 system compared to conventional methods.
Main Methods:
- Technical verification tests were conducted.
- Inter-observer checks were performed.
- User tests with forensic professionals were utilized to evaluate the FreeRef-1 system.
Main Results:
- Measurements from photos using the FreeRef-1 system demonstrated accuracy comparable to conventional techniques.
- The FreeRef-1 system enabled accurate measurements even from photographs taken at strongly oblique angles.
- Forensic professionals validated the system's performance.
Conclusions:
- The FreeRef-1 system enhances accuracy and speed in forensic photography.
- It facilitates evidence photography in hard-to-reach locations, such as under tables or on walls and ceilings.
- The contactless nature minimizes contamination risks in forensic evidence handling.
