3D High-resolution Subsurface Fingerprint Imaging using Superresolution Optical Coherence Tomography

摘要

We report a multi-frame superresolution enhanced spectral domain optical coherence tomography (SD-OCT) forfast and high quality in vivo 3D imaging of subsurface fingerprint. After acquiring several sets of low resolutionC-scans 3D fingerprint images with lateral sub-spot-spacing shifts, a high lateral resolution and high quality 3Dimage is reconstructed by multi-frame superresolution processing. In experiment, about 3 times lateral resolutionimprovement has been achieved from 25 to 7.81 μm with sample arm optics of 0.015 numerical aperture, as wellas doubling the image quality. For in vivo 3D SD-OCT imaging, high quality 3D subsurface live fingerprintimages have been obtained within a short scan time, showing beautiful and clear distribution of eccrine sweatglands that could be an effective indictor to SD-OCT lateral resolution. Without using any complex segmentalgorithm, our high quality 3D fingerprint image could be easily separated into three layers: the externalfingerprint patterns, the distribution of eccrine sweat glands, and the internal fingerprint pattern. The latter twosubsurface layers will benefit high security biometry applications against spoofing attacks.