Computerized system and methods of ballistic analysis for gun identifiability and bullet-to-gun classifications
US6785634B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2003 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Feb 23, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B35/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A computerized system and methods of ballistic analysis involves comparing land impressions on a plurality of control bullets and computing correlation coefficients corresponding to the land-to-land comparisons in all possible relative orientations. A set of matching coefficients is identified for each bullet pair, and the set of matching coefficients is statistically compared to a set of non-matching coefficients. The gun is concluded to be identifiable where the sets of matching coefficients and non-matching coefficients are not statistically undistinguishable. To evaluate whether an evidence bullet was fired by a suspect gun, land impressions on an evidence bullet are compared with land impressions on a plurality of control bullets in all possible relative orientations, and correlation coefficients are computed for each land-to-land comparison to identify a set of questioned coefficients. The evidence bullet is concluded as having been fired by the suspect gun in response to a statistical evaluation that the set of questioned coefficients is statistically equivalent to a set of matching coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.