Crime Scene Analysis with PhotoModeler

There are a number of uses for photogrammetry in crime scene measurement and reconstruction. Measurement in crime scenes is very important and a camera is often present so they go hand-in-hand. Some applications are:

  • creating diagrams of crime scenes
  • extracting measurements (such as height or placement) from surveillance video (also see surveillance video applications page)
  • determining a bullet's 3D trajectory (so source point can be determined)
  • 3D scanning a foot print in sand or soil, and the corresponding shoe
  • 3D scanning of tire mark and the corresponding tire
  • creating orthophotos (photos with no perspective distortion) of fluid spills or blood spatter
  • 3d scans of body surface for bite marks
  • scanning a bullet's striking surface to aid in firearm analysis
  • determining positions of vehicles, cranes, building failures in photos taken just before an accident

Example Crime Scene Analysis

  •  indoor scene
  • Bullet Trajectory
  • foot print
  • blood spatter
  • Bullet Rim

The PhotoModeler Scanner product is capable of producing dense 3D point grids and surfaces from photos of subjects with texture. Two interesting applications are the 3d surface capture of foot prints and tire tracks in sand and soft soil. Similarly the shoes and tires can also be scanned so you have a 3d model of both the imprint and the imprinter.

The image at right shows a 3D point cloud of a shoe print in sand - done with a few photographs and PM Scanner. The top color rendering is done by another package to show depths by color (images courtesy of AI2-3D Forensics).

Crime Scene Analysis with PhotoModeler 5

The image at left (courtesy of AI2-3D Forensics) shows a rendering of 3D shoe surface (different shoe than above) with triangle grid overlaid. The small inset shows a blow up of one section. This illustrates that you can obtain accurate 3D models of both the imprint (shoe in sand), and imprinter (shoe) quickly and easily with PhotoModeler Scanner. An animated 'fly-by' of the rendered 3D shoe surface can be seen below.

Crime Scene Analysis with PhotoModeler 6