A consistent methodology for forensic photogrammetry scanning of human remains using a single handheld DSLR camera

Area of Science:

• Forensic Science
• Photogrammetry
• 3D Imaging

Background:

• Photogrammetry offers a simple, cost-effective, and accurate alternative to traditional 3D optical surface scanning.
• 3D documentation techniques can be integrated into routine forensic examinations.

Purpose of the Study:

• To present a systematic photographing methodology for 3D photogrammetry of human remains.
• To evaluate the accuracy and quality of 3D models generated using different photogrammetry techniques.

Main Methods:

• Four distinct photographing procedures were tested on human subjects.
• Measurement accuracy was assessed using control points and compared to manual measurements.
• Photogrammetry models were compared with 3D laser scanner data.

Main Results:

• A systematic photographing procedure significantly improved the quality of 3D photogrammetry models.
• Techniques 1 and 2 (systematic circular) yielded high accuracy with minimal relative differences (avg. < 0.2%).
• Techniques 3 and 4 (CT-mimicking) showed lower accuracy with higher relative differences (avg. > 0.39%).

Conclusions:

• A carefully composed and tested photographing methodology is crucial for high-quality 3D models in forensic applications.
• Systematic photogrammetry techniques are accurate and efficient for documenting human remains.
• Photogrammetry shows potential for routine adoption in forensic medical examinations.