基于光学相干层析技术显现多层胶带粘面重叠指印的方法  

Optical Coherence Tomography Based Method for Developing Overlapped Fingermarks on Multi-Layer Adhesive Tape

作　　者：吴迪 陆一帆 曾浩然 谢菲 王成铭[3] 高树辉[1] 张宁[2] Wu Di;Lu Yifan;Zeng Haoran;Xie Fei;Wang Chengming;Gao Shuhui;Zhang Ning(School of Investigation,People’s Public Security University of China,Beijing 100038,China;Institute of Forensic Science,Ministry of Public Security,Beijing 100038,China;State Key Laboratory of LowDimensional Quantum Physics,Tsinghua University,Beijing 100038,China)

机构地区：[1]中国人民公安大学侦查学院,北京100038 [2]公安部物证鉴定中心,北京100038 [3]清华大学低维量子物理国家重点实验室,北京100038

出　　处：《激光与光电子学进展》2023年第6期175-181,共7页Laser & Optoelectronics Progress

摘　　要：胶带是犯罪现场常见的作案工具,胶带上留有的指印等物证有重要意义,然而现场发现的胶带通常会相互重叠粘连或者粘附在其他客体上,因此胶带粘面上指印的无损提取一直是刑事技术领域的难题之一.基于此,提出了一种基于光学相干层析(OCT)技术显现胶带粘面潜在指印和分离多层胶带重叠指印的方法.采用自主搭建的频域OCT系统对3种情形下隐藏在胶带粘面的潜在指印进行检测,通过可视化处理获取指印的二维截面图像、en face横截面图像、三维渲染图像并分析其产生机理.结果表明,OCT技术不但可以实现对单层胶带粘面上潜在指印的快速无损显现,而且可对多层胶带上重叠指印进行分离,同时能够消除多色背景图案的干扰,指印细节特征的质量清晰、数量充足.通过3D渲染可以观察到汗孔等三级特征的分布信息,为指印显现提供了新的技术和方法.Adhesive tapes are common criminal tools used at crime scenes,and fingermarks and other physical evidence on tapes are crucial.However,the adhesive tapes found at crime scenes are usually overlapped,stuck to each other,or adhered to other objects;thus,the nondestructive extraction approach of fingermarks on the surface of the adhesive tapes has always been one of the most challenging problems in the field of forensic science.In this study,a new approach based on optical coherence tomography(OCT)is proposed to develop the latent fingermarks on the surface of the adhesive tapes and separate the overlapped fingermarks of many layers of adhesive tapes.A selfbuilt OCT system in the frequency domain was used to detect the latent fingermarks hidden on the adhesive tape’s surface under three conditions.Twodimensional crosssection images,en face transversal images,and threedimensional(3D)rendering images of fingermarks were obtained using the visual processing approach,which was used to examine their mechanisms.The results revealed that OCT technology could not only quickly and nondestructively develop latent fingermarks on the singlelayer adhesive tape surface and separate the overlapped fingermarks on multilayer adhesive tapes but also eliminate the interference of multicolor background patterns at the same time.The quality of the images was high and the details were clear;the distributed information of the third level characteristic,such as sweat pores,can be observed through 3D rendering as well.This offers a new technique and approach for developing fingermarks.

关 键 词：成像系统 光学相干层析技术 指印显现 胶带粘面 潜在指印 重叠指印 无损检验 

分 类 号：O436[机械工程—光学工程]