枪弹头痕迹自动比对方法的研究

研究了枪弹头痕迹自动比对方法,用最优化的方法消除测量误差,通过中值滤波去除随机噪声,并根据数据的相似性度量理论确定了以横向相关性为基础的比对方案.

Research on Automatic Comparision Method of Bullet Mark

The automatic matching methods of bullet marks are modeled mathematically in this essay.The results are as follows:1) the concept of pose marking line is brought forward, and the slope and intercept of the pose marking line was used as two indexes marking the pose and position of the bullet to reduce the errors of the manual measuring;2) by removing the noise and changing coordinates on the original information,the contour map was plotted, and the comparing characteristics of the bullet marks geometry was extracted;by testing the significance correlation coefficients of the region in which the coefficients is greater than 0.4038 is thought as a stable and high relevant bullet-ridden measurement data region;3) by calculating the correlation coefficients and error matrix according to each sub edge in different offsets of the matching for two random warheads,the best sub edge contrast was found,then the degree of similarity between the two was listed by comparing the overall similarity of the contrasted warheads.