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Related Experiment Video

Updated: Mar 21, 2026

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Using 3DF Zephyr to determine body-worn camera position.

Cheryl Fung^1,2, Eugene Liscio²

¹Institute of Forensic Sciences, University of Toronto, Mississauga, Ontario, Canada.

Journal of Forensic Sciences

|March 20, 2026

Summary

This summary is machine-generated.

This study assessed the accuracy of 3DF Zephyr photogrammetry software in calculating body-worn camera positions from video. The software estimated camera locations within a 24cm radius, aiding in corroborating evidence in forensic investigations.

Keywords:

3D forensics 3D reconstruction body camera camera match camera matching camera position camera solve camera tracking officer position photogrammetry

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Area of Science:

Forensic Science
Photogrammetry
3D Modeling

Background:

Photogrammetry is crucial for 3D crime scene documentation.
Traditional methods use numerous still photos.
Body-worn cameras (BWCs) are increasingly common in law enforcement.

Purpose of the Study:

To evaluate the accuracy of 3DF Zephyr software in determining BWC positions from video footage.
To assess the feasibility of using video-derived 3D models for forensic analysis.

Main Methods:

Videos from Axon Body 3, Body 2, and Flex 2 cameras were processed using 3DF Zephyr.
3D models of a mock scene were generated from extracted video frames.
FARO laser scanner data provided ground truth for coordinate comparison.

Main Results:

Average errors for Axon Body 3, Body 2, and Flex 2 were 7.6cm, 10.1cm, and 9.5cm, respectively.
Overall average error was 9.1cm (SD 4.8cm).
98.7% of errors fell within a 24cm radius circle.

Conclusions:

3DF Zephyr can accurately estimate BWC positions from video.
This technique can pinpoint officer locations, corroborating witness testimony.
Accuracy may be reduced in low-light or low-texture environments.