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Resolving Reflection and Resolution in 3D Imaging of Fresh Bone.
Rabbia Imran1, Tracy L Rogers1
1University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, Ontario, L5L 1C6, Canada.
Journal of Forensic Sciences
|July 24, 2019
Summary
Structured light scanning (SLS) shows promise for tool mark analysis on bone, but reflection hinders imaging. Vertical pattern-coded light offered the best results, though resolution needs improvement for detailed analysis.
Area of Science:
- Forensic Science
- 3D Imaging Technology
Background:
- Structured light scanning (SLS) is a noninvasive, accurate, 3D imaging method.
- Reflection from biological surfaces like fresh bone impedes SLS imaging for forensic applications.
Purpose of the Study:
- To evaluate the efficacy of the David SLS-1 scanner for imaging tool marks on bone.
- To investigate strategies for mitigating reflection artifacts during SLS of bone surfaces.
Main Methods:
- Six reflection-reduction strategies were tested: surface dulling (freezing, talcum powder, dulling spray, compressed air) and light alteration (diffuser, pattern-coded light).
- The David SLS-1 scanner was used to image saw marks on bone specimens.
Main Results:
- None of the tested methods completely eliminated reflection or produced complete images.
- Insufficient resolution prevented the capture of fine striation details.
- Vertical pattern-coded light demonstrated the most potential for reducing reflection.
Conclusions:
- Current SLS technology, including the David SLS-1, requires enhanced resolution for detailed forensic analysis of tool marks on bone.
- Further research into pattern-coded light strategies is warranted to overcome reflection challenges in bone imaging.
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