Photogrammetry Tool for Forensic Analysis

This acquires visual crime and accident scene data for later processing.

A system allows crime scene and accident scene investigators the ability to acquire visual scene data using cameras for processing at a later time. This system uses a COTS digital camera, a photogrammetry calibration cube, and 3D photogrammetry processing software.

In a previous instrument developed by NASA, the laser scaling device made use of parallel laser beams to provide a photogrammetry solution in 2D. This device and associated software work well under certain conditions. In order to make use of a full 3D photogrammetry system, a different approach was needed.

When using multiple cubes, whose locations relative to each other are unknown, a procedure that would merge the data from each cube would be as follows:

1. One marks a reference point on cube 1, then marks points on cube 2 as unknowns. This locates cube 2 in cube 1’s coordinate system.

2. One marks reference points on cube 2, then marks points on cube 1 as unknowns. This locates cube 1 in cube 2’s coordinate system.

3. This procedure is continued for all combinations of cubes.

4. The coordinate of all of the found coordinate systems is then merged into a single global coordinate system.

In order to achieve maximum accuracy, measurements are done in one of two ways, depending on scale: when measuring the size of objects, the coordinate system corresponding to the nearest cube is used, or when measuring the location of objects relative to a global coordinate system, a merged coordinate system is used.

Presently, traffic accident analysis is time-consuming and not very accurate. Using cubes with differential GPS would give absolute positions of cubes in the accident area, so that individual cubes would provide local photogrammetry calibration to objects near a cube.

This work was done by John Lane of ASRC Aerospace for Kennedy Space Center. KSC-12975

This Brief includes a Technical Support Package (TSP).

Photogrammetry Tool for Forensic Analysis (reference KSC-12975) is currently available for download from the TSP library.

Please Login at the top of the page to download.


White Papers

Liquid Silicone Rubber Takes the Heat
Sponsored by Proto Labs
How to Select an Analog Signal Generator
Sponsored by rohde and schwarz a and d
3D Printing of Aerospace Parts: A Real Solution with Real Benefits
Sponsored by stratasys
Making Waste History: 3D Measurement Technology Bumps Bottom-line Growth
Sponsored by FARO
Remediation and Prevention of Moisture in Electronics
Sponsored by multisorb technologies
External Power Supply Efficiency Regulation Introduction
Sponsored by mega electronics

White Papers Sponsored By: