3D high-resolution subsurface fingerprint imaging using superresolution optical coherence tomography

Multi-Frame Superresolution Optical Coherence Tomography for High Lateral Resolution 3D Imaging

“…The motion effect can be generally ignored when imaging non-biomedical samples such as microstructures [19,37] since both the sample arm and the samples are stable. The motion effect should be considered for imaging of in vivo tissue such as fingerprint [31,38] due to potential live body vibrations. According to the superresolution principle [52][53][54], the resolution improvement comes from the effective sub-pixel information differences among multi-frame low resolution images, as illustrated in Figure 6.…”

“…Also, the near infrared light source in OCT usually has no photo reactions with most materials, very safe for quality testing of damage in silica [16], glass-fiber reinforced polymer samples [17], strained polymer samples [18], microstructures [19][20][21][22][23], papers [24], oil paintings [25], film coatings [26], fastener flushness [27], and so on. Besides, the successful detection of embedded and hidden structures is another potential of OCT for security applications, such as 3D fingerprint identification defending against spoofing attack with fake fingerprints [28][29][30][31]. However, compared with other imaging techniques such as microscopy and confocal microscopy, the low lateral resolution and high speckle noise restrict the OCT becoming a competitive imaging tool in some non-biomedical areas highly relying on en-face lateral image quality.…”