An Improved Algorithm of Congruent Matching Cells (CMC) Method for Firearm Evidence Identifications

作者：Tong Mingsi^*; Song John; Chu Wei

来源：Journal of Research of the National Institute of Standards and Technology, 2015, 120: 102-112.

DOI：10.6028/jres.120.008

• ballistics identification
• cartridge case
• Congruent Matching Cells (CMC)
• correlation cells
• forensic science
• image processing

The Congruent Matching Cells (CMC) method was invented at the National Institute of Standards and Technology (NIST) for firearm evidence identifications. The CMC method divides the measured image of a surface area, such as a breech face impression from a fired cartridge case, into small correlation cells and uses four identification parameters to identify correlated cell pairs originating from the same firearm. The CMC method was validated by identification tests using both 3D topography images and optical images captured from breech face impressions of 40 cartridge cases fired from a pistol with 10 consecutively manufactured slides. In this paper, we discuss the processing of the cell correlations and propose an improved algorithm of the CMC method which takes advantage of the cell correlations at a common initial phase angle and combines the forward and backward correlations to improve the identification capability. The improved algorithm is tested by 780 pairwise correlations using the same optical images and 3D topography images as the initial validation.

• 出版日期2015-4-29
• 单位哈尔滨工业大学