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对枪弹头痕迹自动比对方法问题进行建模分析,结论如下:1)提出了姿态标识线的概念,将姿态标识线的斜率和截距作为标识弹头位置和姿态的两个指标以此来消除由人工测量造成的误差.2)通过对原始信息进行去噪、变化坐标等预处理,绘制等高线图,提取弹痕几何对比特征;通过显著性检验确定相关系数大于0.4038的具有显著相关关系区域作为一个稳定且相关度高的弹痕测量数据区域;3)对任意两个弹头分别计算不同比对偏移量时各个次棱所各自对应的相关系数和误差矩阵,寻找最佳次棱对比,然后对比对过的两个弹头计算两者之间的整体相似程度,列表给出两两之间的相似程度.
The paper analyzes the method of automatically comparing the bullet marks, and concludes as follows: 1) The concept of pose marking line is proposed, and the slope and intercept of the pose marking line are used as two indicators to identify the position and attitude of the warhead so as to eliminate The error caused by manual measurement.2) The original contour information is denoised, change coordinates and other pretreatment, draw the contour map, extract the geometric characteristics of the bullet tracing; Through significant test to determine the correlation coefficient greater than 0.4038 with significant correlation area As a stable and highly correlated bullet measurement data area; 3) For any two warheads, calculate the correlation coefficient and error matrix corresponding to each secondary prism when different alignment offset, respectively, to find the optimal secondary edge contrast, and then Comparing the two warheads against each other to calculate the overall similarity between the two, the list gives the degree of similarity between the two.