Correlation of Firing Pin Impressions Based on Congruent Matching Cross-sections (CMX) Method
Hao H. Zhang, Jun-Feng Song, D Ott, Wei Chu
Comparison of firing pin impressions of cartridge cases is an important part of firearms evidence identification. However, compared with breach face impressions, there is only a limited surface area over which firing pin impressions can be compared. Furthermore, the curvature of firing pin impressions makes it difficult to perform automatic correlations of the surfaces. In this study, a new method and related algorithm named congruent matching cross- sections (CMX) are proposed. Each firing pin impression is sliced into layers and the resulting circular cross-sections are converted to two dimensional profiles by a polar coordinate transformation. The differential profile extraction method is used for extracting the high frequency micro-features, or the individual characteristics, for accurate correlation. Three parameters are proposed for determining whether these pairwise firing pin impressions are fired from the same firearm. The cross-correlation function (CCF) is used for quantifying similarity of the pair-wise profiles which represent the two correlated firing pin images. If the correlated cartridge pair is fired from the same firearm, the maximum CCF value between each of the profiles from the reference firing pin impression and those of the correlated firing pin impression will be high. The other two parameters relate to the range of relative shifts that the profiles undergo to obtain the maximum CCF. These shifts are the phase angle θ which corresponds to a horizontal shift of the 2D profiles and the vertical shift distance of slice location, i.e. where the profiles match in the depth of the impression. These shift parameters are used to determine the congruency of the pair-wise correlated profiles. When these parameter values and their statistical distributions are collected for analysis, the CMX number is derived as a key parameter for a conclusive identification or exclusion. Validation tests using 40 cartridge cases of three different brands fired from 10
, Song, J.
, Ott, D.
and Chu, W.
Correlation of Firing Pin Impressions Based on Congruent Matching Cross-sections (CMX) Method, Forensic Science International, [online], https://doi.org/10.1016/j.forsciint.2016.04.015
(Accessed December 11, 2023)