Firearm Identification Based on Microscopic Image Analysis of Striated Marks on Fired Bullets.

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  • IGARASHI Naoaki
    Second Machinery Section, National Research Institute of Police Science
  • TSUMURA Norimichi
    Department of Information and Computer Sciences, Faculty of Engineering, Chiba University
  • HANEISHI Hideaki
    Department of Information and Computer Sciences, Faculty of Engineering, Chiba University
  • MIYAKE Yoichi
    Department of Information and Computer Sciences, Faculty of Engineering, Chiba University

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Other Title
  • 線条痕画像解析による発射銃器の同定
  • セン ジョウコン ガゾウ カイセキ ニヨル ハッシャ ジュウキ ノ ドウテイ

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Individual characteristics of a firearm are printed as striated marks on the fired bullets. These characteristics have been observed and analyzed by experts for identifying the firearm. In this paper, a method of computer-aided firearm identification based on signal analysis is presented. One dimensional wave forms are extracted from striated mark images of two bullets under the test and compared each other. Similarity between the two wave forms is numerically evaluated and used for identification based on a probability model. Results of the comparison experiment with two bullets fired from the same gun showed that the identification can be achieved under a significance level of 10-6.

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