汗潜指纹紫外偏振反射特性研究(特约)

汗潜指纹是犯罪现场最常见的指印类型，具有特征消失快且不易被检测等特点。根据其特点，使用紫外偏振成像探测技术进行目标检测，相比传统强度图像，偏振参量图像可以提高目标对比度，有助于辨别不同背景中的目标。但紫外偏振成像探测技术对角度、波段及客体材料等较为敏感，所以通过设计合理的实验，分析了汗潜指纹紫外偏振反射特性随角度、波段及客体材料的变化特点。结果表明:汗潜指纹在不同角度下表现出规律的偏振特性；在系统提供的四个光谱偏振通道中，近紫外波段相比之下有很好的可重复性和区分性；不同客体材料偏振特性差异变化较大，对比分析样本的紫外偏振反射特性能有效提高潜指纹的探测和识别性能，为汗潜指纹紫外偏振成像探测技术提供依据。

Study on UV polarization reflection characteristics of sweat latent fingerprints(Invited)

Sweat latent fingerprint was the most common type of fingerprint on crime scenes, featuring features that disappeared quickly and were not easily detected. According to its characteristics, the UV polarization imaging detection technology was used for target detection. Compared with the traditional intensity image, the polarization parameter image could improve the target contrast and help to distinguish the targets in different backgrounds. However, the UV polarization imaging detection technology was sensitive to angles, bands and guest materials. Therefore, through the design of reasonable experiments, the characteristics of the UV polarization reflection characteristics of the sweat latent fingerprints with angle, band and guest materials were analyzed. The results show that the sweat latent fingerprints exhibited regular polarization characteristics at different angles; among the four spectral polarization channels provided by the system, the near-ultraviolet bands are well reproducible and distinguishable; the polarization characteristics of different guest materials varied greatly. The UV-polarized reflection characteristics of the comparative analysis samples effectively improved the detection and recognition performance of latent fingerprints, and provided a basis for the UV-polarized imaging detection technology of sweat latent fingerprints.