基于偏振成像-空间滤波的相位物体上指纹检测  

Fingerprint detection on phase objects based on polarization imaging and spatial filtering

作　　者：余有平 刘碧旺 何梓熙 钟俊平 曾亚光[1] YU Youping;LIU Biwang;HE Zixi;ZHONG Junping;ZENG Yaguang(Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology,School of Physics and Optoelectronic Engineering,Foshan University,Foshan Guangdong 528000,China)

机构地区：[1]佛山科学技术学院物理与光电工程学院粤港澳智能维纳光电技术联合实验室,广东佛山528000

出　　处：《激光杂志》2024年第8期76-80,共5页Laser Journal

基　　金：国家自然科学基金(No.61705036、61771139、61805038、62075042);广东省重点领域研究与发展计划(No.2020B1111040001);粤港澳智能微纳光电技术联合实验室研究基金(No.2020B1212030010)。

摘　　要：提出了一种结合偏振成像与空间滤波的指纹检测系统,该系统能有效提取淹没在干扰背景中的指纹信息,实现了在相位物体上指纹目标的高质量成像。通过使用聚焦透镜和通孔反射镜,滤除夫琅禾费衍射图样的低频背景,仅采集高频细节信息,结合偏振成像技术,得到指纹图像的偏振参量和偏振度(P_(DOLP))图像,实现清晰的指纹成像。结果显示,添加空间滤波模块和偏振成像技术得到的指纹图像在指纹图像清晰度上提高了约6.8倍,使得细节和纹路更为突出;相较于指纹强度图像,指纹偏振度P_(DOLP)图像能够很大程度上消除相位物体上其他干扰物质的影响,获取完整、丰富的指纹细节信息。这种技术在指纹验证和刑事侦查等领域具有潜在应用价值。This paper proposes a fingerprint detection system that integrates polarized imaging with spatial filtering.The system effectively extracts fingerprint information submerged in background noise,achieving high-quality imaging of fingerprint targets on phase objects.By using a focusing lens and a pinhole reflector,low-frequency background patterns of Fraunhofer diffraction are filtered out,capturing only high-frequency detail information.With the integration of polarized imaging technology,the polarization parameters and Polarization Degree of Linear Polarization(PDOLP)images of fingerprint images are obtained,resulting in clear fingerprint imaging.The results show that the addition of spatial filtering and polarized imaging technology improves the clarity of fingerprint images by approximately 6.8 times,highlighting details and ridges of fingerprint.Compared to intensity images,PDOLP images of fingerprint can significantly eliminate the influence of other interfering substances on phase objects,obtaining more complete and rich fingerprint detail information.This technology holds potential applications in fingerprint verification and criminal investigation fields.

关 键 词：偏振成像 指纹检测 空间滤波 相位物体 

分 类 号：O439[机械工程—光学工程]