弹头痕迹图像分形动力学研究  

Kinetic Analysis of Bullet Engraving Based on Fractal Geometry

作　　者：杨敏[1] 王纬东[1] 牟丽[2] 景畅[1] 

机构地区：[1]广东警官学院刑事技术系,广东广州510232 [2]广东警官学院计算机科学与技术系,广东广州510232

出　　处：《兵工学报》2009年第4期398-402,共5页Acta Armamentarii

基　　金：公安部科技应用创新项目(2007YYCXGDST077)

摘　　要：弹头痕迹的分析与比对是破获涉枪案件的关键,目前国内外在这方面主要采用对弹头痕迹的几何形态、位置及线条进行比对的方法。在分析弹头膛线痕迹区域形成特点的基础上,结合分形能够描述复杂自然物体表面的特点,提出了使用分形理论分析弹头痕迹的新方法,将弹头痕迹的图像映射到一维目标信号,通过对目标信号进行频率域分形维数分析,发现弹头痕迹频率域具有多度域分形特征,且其分形结构与枪膛对应部位的磨损状况有对应关系,得到一些有意义的结论。研究结论表明,所提出的方法为枪弹痕迹的司法分析与鉴定提供了新的思路,扩展了司法弹道学的研究方法。Analysis and comparison of bullet engraving are important for criminal investigation and the discovery of evidence in gun related case. So far, the theory and method in use are mainly based on comparisons of Euclid geometry size, position and striations. On the basis of analyzing the shaping theory of bullet engraving, a novel method which uses a fractal theory to analyze the bullet engraving was proposed. ＇First of all, the proposed method reduces the dimensionality by mapping a two-dimensional gray-level image into a one-dimensional object signal. Then the fractal analysis approach is utilized in frequency domain for the one-dimensional signal. We found the multi-fraetal features of bullet engraving in frequency domain and its multi-dimension fractal structures were related to the wear of corresponding position of gun chamber. This is a very interesting result and can be successfully used in analyzing and identifying bullet engraving. The researched result shows the proposed method provides a new thinking for judicial analysis and appraisement of bullet engraving, and spreads the research idea of judicial ballistics.

关 键 词：刑法学 弹头痕迹 分形维数 多重分形 分形动力学 磨损 司法弹道学 

分 类 号：D918[政治法律—法学]