中国塑料 ›› 2021, Vol. 35 ›› Issue (3): 124-129.DOI: 10.19491/j.issn.1001-9278.2021.03.017

• 标准与测试 • 上一篇    下一篇

基于Fisher判别⁃支持向量机的汽车灯罩显微激光拉曼光谱研究

颜文杰, 卫辰洁, 范琳媛, 王继芬()   

  1. 中国人民公安大学侦查学院,北京 102600
  • 收稿日期:2020-09-18 出版日期:2021-03-26 发布日期:2021-03-22

Study on Microscopic Laser Raman Spectroscopy of Automobile Lampshade Based on Fisher Discriminant⁃Support Vector Machine

YAN Wenjie, WEI Chenjie, FAN Linyuan, WANG Jifen()   

  1. School of Investigation,People’s Public Security University of China,Beijing 102600,China
  • Received:2020-09-18 Online:2021-03-26 Published:2021-03-22
  • Contact: WANG Jifen E-mail:wangjifen58@126.com

摘要:

为实现对司法鉴定工作中经常遇到的汽车灯罩类物证进行数据化、可视化的无损高效率鉴别,采用PCA主成分分析前处理结合FDA-SVM(RBF)组合分析鉴别物证的方法,对获取的“奥迪”“别克”等18个品牌的173组拉曼红外光谱数据进行了实验和理论分析。借助Pearson相关性分析和PCA主成分分析的结果选择特征位移,分别建立基于Fisher判别分析和SVM支持向量机的数据分类模型。结果表明,FDA模型和SVM(RBF)模型对灯罩样本的综合区分准确率分别为97 %和51.85 %,SVM模型对“奔驰”“别克”等8个品牌的区分准确率达到了100 %,FDA与SVM模型互相补充的FDA-SVM(RBF)模型可对不同品牌灯罩拉曼红外光谱进行准确区分,分类效果较好。该方法高效、准确,对侦查破案中借助灯罩物证鉴定缩小侦察范围有一定的参考意义。

关键词: 拉曼光谱, 灯罩物证, 支持向量机, Fisher判别分析

Abstract:

To realize the data?based, visualized, non-destructive and high-efficiency identification of automobile lampshades as physical evidence frequently appearing in the judicial appraisal work, the PCA principal component analysis pre?processing method combined with a FDA-SVM (RBF) combination analysis was adopted to identify the physical evidence. An experiment and theoretical analysis was conducted for 173 sets of the Raman infrared spectroscopy data obtained from 18 brands “Aodi” and “Bieke” cars. With the help of Pearson correlation analysis and PCA principal component analysis, the characteristic Raman shift was selected, and the data classification models based on the Fisher discriminant analysis and SVM support vector machine were established. The results indicated that the FDA and SVM (RBF) models had a comprehensive discrimination accuracy of 97 % and 51.85 % for lampshade samples, respectively. The SVM model had an accuracy of 100 % for 8 brands of “Benchi” and “Bieke” cars. The FDA-SVM (RBF) model obtained from the complement of the FDA and SVM models can accurately distinguish the Raman infrared spectra of different brands of lampshades. This method is efficient and accurate, and it can provide some references for reducing the scope of investigation when using the lampshade material evidence identification in case investigations.

Key words: Raman spectroscopy, lampshade material evidence, support vector machine, fisher discriminant analysis

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