Desenvolvimento de um sistema automatizado para captura e comparação de estriamentos de projéteis de armas de fogo

Abstract

The increasing use of guns in crimes has been a constant worrying to the law enforcemen and the need of capable information in order to get a solution for those crimes is evident. The detection of correlative previous crimes becomes a powerful tool that can be decisive to the solution of a criminal action. The creation of a proper system that is able to detect the use of the same gun on diferent crimes becomes a huge need for the techno-scientific policy institutes and it opens a wide range of information that wasn't possible before due to de complexity in ballistic comparishion processes, that envolves the ballistics examiner to indivualy analyze each speciment. This work introduces a beginning in the development of equipment with national technology for automatic ballistic projects comparison. It is introduced the mechanism of image acquisition of the projectile, a methodology of the set up of this image and the comparisons among the micro striation marks, and determining the similarity level among picked samples using Cross Correlation Function (CCF)The most important results were the capture and the set up of the lateralarea image of a three-dimensional object as well the comparison of acquired sample images. These comparisons allowed to determine what samples were produced by the same gun. It is expected, with the future development of the present work, it can be produced national solutions for the automatic ballistic comparisons, by searching related facts in appropriated databases.