FSC239Y5 Lecture Notes - Lecture 4: Stimulated Emission, Lidar, Virtual Tour
1. 3D Forensics: From Subjectivity to Quantitative Analysis
3D Forensics: Use of three dimensional technologies that assist with the
documentation, analysis, reconstruction and visualization of evidence.
A reconstruction is based on available physical evidence and can be used for analysis or
substantive purposes.
A recreation is mostly a “creative” work (although it may be based in part on physical
data), it may rely on witness testimony or other non-physical sources of data. The main
use is for demonstrative purposes.
Applications:
oClandestine Graves
Laser scans can be created of the hole and what’s in it.
Shovel impressions can be recorded in 3D.
Shows how similar and different the shovel impressions and shovel are.
oAutopsies
o3D Impression Evidence.
oShooting Reconstructions/Trajectory Analysis.
oSuspect Height Analysis (can pull frames from videos and images).
Can uncover position, height, speed, etc.
oRCMP Test.
oForensic Anthropology.
Age analysis, etc.
Lord Kelvin: I often say that when you can measure what you are speaking about, and
express it in numbers, you know something about it; but when you cannot measure it,
when you cannot express it in numbers, your knowledge is of a……
o3D microscopes that can measure things in 3D.
oStructured Light Scanners.
Fringe patterns.
Good for footwear impressions.
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
3d forensics: from subjectivity to quantitative analysis. 3d forensics: use of three dimensional technologies that assist with the documentation, analysis, reconstruction and visualization of evidence. A reconstruction is based on available physical evidence and can be used for analysis or substantive purposes. A recreation is mostly a creative work (although it may be based in part on physical data), it may rely on witness testimony or other non-physical sources of data. Laser scans can be created of the hole and what"s in it. Shovel impressions can be recorded in 3d. Shows how similar and different the shovel impressions and shovel are: autopsies, 3d impression evidence, shooting reconstructions/trajectory analysis, suspect height analysis (can pull frames from videos and images). Can uncover position, height, speed, etc: rcmp test, forensic anthropology. Photogrammetry: measure from photographs: take a whole bunch of photographs and it will give you a 3d model, want photos at varying angles, image straightening-single photo, can use underwater as well (anywhere).
