基于反射变换成像技术探究姊妹线笔痕特征  

The characteristics of sister lines pen marks were studied based on Reflectance Transformation Imaging

作　　者：孙林杰 陈维娜[1] 郑宇 刘宁[3] SUN Linjie;CHEN Weina;ZHENG Yu;LIU Ning(School of Investigation,People’s Public Security University of China,Beijing 100038,China;Criminal police detachment,Weifang City Public Security Bureau,Weifang,Shandong 261041,China;Jiangsu Police College,Nanjing,Jiangsu 210031,China)

机构地区：[1]中国人民公安大学侦查学院,北京10038 [2]潍坊市公安局刑警支队,山东潍坊261041 [3]江苏警官学院,江苏南京210031

出　　处：《光散射学报》2024年第4期479-488,共10页The Journal of Light Scattering

基　　金：中国人民公安大学刑事科学技术双一流创新研究专项(2023SYL06)。

摘　　要：为解决法庭科学文件检验领域中的笔迹鉴定问题,我们首次采用反向变换成像技术观察姊妹线的三维特征并进行量化分析。本次实验利用写字机器人控制写字力度、书写角度、方位角、笔纸夹角,统一在笔纸夹角30°、45°、60°、90°,方位角0°、30°、45°、60°的条件下利用21种国内常见的笔制作“林”字样本,共计336组实验样本,在法线可视化模式下对样本进行成像分析,分析各组样本的姊妹线特征从而得出姊妹线出现的最佳条件。随后,在最佳条件下基于RTI技术的三维重建和量化分析探究影响姊妹线的因素。最后对不同笔纸夹角下样本姊妹线的出现概率进行方差分析。初步实验结果表明,滚珠类的笔在以纸张为衬垫物方位角为45°、笔纸夹角为45°时姊妹线特征最为明显,重复实验时姊妹线的出现概率高达99%;笔纸夹角对姊妹线的形成具有决定性的影响,方位角则只会影响姊妹线的显现效果,RTI技术与姊妹线的结合为笔迹检验方法体系的补充和丰富提供了新的可能性,在文件检验领域具有广阔的发展前景。In order to solve the problem of handwriting identification in the field of scientific document examination in court,we usedreflectance transformation imaging to observe the three-dimensional characteristics of sister lines and quantitatively analyze them for the first time.In this experiment,the writing robot was employed to regulate the writing strength,writing angle,azimuth angle,and pen and paper clamp angle.A total of 21 common domestic pens were utilized to create“Lin”samples under the pen and paper clamp angles of 30°,45°,and 60°.The experimental samples were produced at azimuth angles of 0°,30°,45°,and 60°,and at 0°,30°,and 45°with respect to the line of sight.In total,336 sets of samples were produced and imaged under the normal line visualization mode.The sister line characteristics and quantitative analysis were then conducted.A total of 336 sets of experimental samples were imaged and analyzed in the normal visualization mode,and the sister line characteristics of each set of samples were analyzed to derive the optimal conditions for the appearance of sister lines.Subsequently,under the optimal conditions,the factors affecting the sister lines were investigated by 3D reconstruction and quantitative analysis based on RTI technology.Finally,the probability of sister line appearance of the samples under different pen and paper clip angles was analyzed by ANOVA.Preliminary experimental results show that the sister line feature is most obvious when the azimuth angle is 45°and the pen and paper clamp angle is 45°,and the probability of the sister line appearing is as high as 99%when the experiment is repeated;the pen and paper clamp angle has a decisive influence on the formation of the sister line.The combination of RTI technology and sister lines provides new possibilities for the supplementation and enrichment of the handwriting inspection method system,and has a broad development prospect in the field of document inspection.

关 键 词：反射变换成像技术 姊妹线 笔迹鉴定 文件检验 

分 类 号：O436[机械工程—光学工程]