Synchronous Fingerprint Acquisition System Based on Total Internal Reflection and Optical Coherence Tomography
Synchronous Fingerprint Acquisition System Based on Total Internal Reflection and Optical Coherence Tomography
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基于全内反射和光学相干断层扫描的同步指纹采集系统
DOI：
10.1109/tim.2020.2988988
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发表时间：
2020-10-01
影响因子：
5.6
通讯作者：
Liang, Ronghua
中科院分区：
文献类型：
--
作者：
Sun, Haohao;Zhang, Yilong;Liang, Ronghua
全内反射（TIR）采集外部指纹的研究已经进行了几十年，光学相干层析成像（OCT）采集内部指纹的研究才刚刚开始。内部指纹几乎不受手指表面状态的影响，具有较强的抗干扰和抗欺骗能力，可以作为外部指纹的有力补充。然而，由于指纹质量、失真程度和检测区域的差异，不同方式获取的指纹匹配会导致指纹识别精度的下降。由于缺乏比较工具来研究内部指纹与外部指纹之间潜在的相关性，因此内部指纹能否代替外部指纹直接进行识别一直受到阻碍。为了研究内部指纹和外部指纹之间的联系，需要一种同时实现相同指纹面积测量的同步采集系统。TIR和OCT不同光路的集成以及两种完全不同成像方式的畸变校正是两个具有挑战性的问题。本文介绍了一种利用TIR和OCT分别同步采集外部指纹和内部指纹的指纹采集系统。采用自行设计的梯形棱镜，集成了TIR和OCT光路。在此基础上，提出了一种基于栅格定标板的畸变校正方法，消除了两种成像方法造成的畸变。在264组指纹数据集中说明了指纹质量统计。辨识结果表明，该系统的同步采集和畸变校正是有效的。
The research of external fingerprint collected by total internal reflection (TIR) has been carried out for decades and the research of internal fingerprint collected by optical coherence tomography (OCT) has just begun. The internal fingerprint can be hardly affected by the finger surface status, due to its strong antiinterference and antispoofing ability, which can serve as a powerful supplement to external fingerprint. However, matching fingerprints acquired in different ways can lead to a drop in fingerprint recognition accuracy due to the differences in fingerprint quality, distortions, and detection areas. Whether the internal fingerprint can be used to replace the external fingerprint for direct identification has been hampered by lacking comparison tools to study potential correlation with each other. To study the connection between internal and external fingerprints, a synchronous acquisition system that achieves the same fingerprint area measurement at the same time is necessary. The integration of different optical paths of TIR and OCT as well as the consequent distortion correction of two totally different imaging ways are two challenging problems. This article presents a fingerprint acquisition system that synchronously acquires the external fingerprint and internal fingerprint with TIR and OCT, respectively. By using a self-designed trapezoidal prism, optical paths of TIR and OCT were integrated. Furthermore, a distortion correction method based on a grid calibration plate is used to remove distortions caused by two imaging methods. The fingerprint quality statistics are illustrated in 264 sets of fingerprint data sets. Identification results show synchronous acquisition and distortion correction of the proposed system are efficient.