中国激光, 2018, 45 (7): 0704003, 网络出版: 2018-09-11   

渗透性纸张上潜在指印检测技术研究 下载: 705次

Detection of Latent Fingerprints on Porous Paper
作者单位
1 中国科学院上海光学精密机械研究所信息光学与光电技术实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 上海海潮新技术研究所, 上海 200070
摘要
潜在指印的检测是物证检测中关键的一步。针对多种渗透性纸张上遗留的潜在指印,基于潜在指印残留物中有机物成分在紫外光激发下会产生荧光的特性,采用266 nm紫外激光器作为激发光源,通过二维激光扫描系统对潜在指印区域进行快速扫描,采用窄带滤光片滤除干扰光,以指印条纹对比度作为依据优化实验参数,采用剔除奇异亮点和提高对比度的方法复原指印荧光图像。通过对复印纸、书写纸、学生作业纸、便利贴和报纸这5种渗透性纸张上的汗指印和油指印进行检测,获得了汗指印和油指印的清晰图像。该方法可实现渗透性纸张上潜在指印的无损检测,在刑事侦查、痕迹检测等多个领域具有重要应用。
Abstract
Detection of latent fingerprints is one of the key steps in material evidence detection. On the basis of the characteristic that the organic components of latent fingerprints will produce fluorescence under ultraviolet excitation, the two-dimensional laser scanning system is adopted to scan the latent fingerprints left on the surface of porous paper with high speed (the 266 nm ultraviolet laser is used as excitation light source). Interference light is filtered by narrow band filter. The experimental parameters are optimized according to the fingerprint stripe contrast, the latent fingerprint fluorescence images is reconstructed by the methods of removing the singular highlights and enhancing the fingerprint stripe contrast. By above methods, clear images of the sweat fingerprints and sebaceous fingerprints left on the surface of five types of porous paper (copy paper, writing paper, student work paper, sticky note and newspaper) can be obtained. The method can realize the non-destructive detection of latent fingerprints on the porous paper. It has important applications in many fields such as criminal investigation and trace detection.

赵成, 黄立华, 凌丽青, 郭凯, 屈建峰, 张善华, 李红霞, 庄锡峰, 黄惠杰. 渗透性纸张上潜在指印检测技术研究[J]. 中国激光, 2018, 45(7): 0704003. Cheng Zhao, Lihua Huang, Liqing Ling, Kai Guo, Jianfeng Qu, Shanhua Zhang, Hongxia Li, Xifeng Zhuang, Huijie Huang. Detection of Latent Fingerprints on Porous Paper[J]. Chinese Journal of Lasers, 2018, 45(7): 0704003.

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