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Images recorded below the surface of a finger can have more details and be ofhigher quality than the conventional surface fingerprint images. This isparticularly true when the quality of the surface fingerprints is compromisedby, for example, moisture or surface damage. However, there is an unmet needfor an inexpensive fingerprint sensor that is able to acquire high-qualityimages deep below the surface in short time. To this end, we report on acost-effective full-field optical coherent tomography (FF-OCT) system comprisedof a silicon camera and a powerful near-infrared LED light source. The system,for example, is able to record 1.7 cm x 1.7 cm en face images in 0.12 s withthe spatial sampling rate of 2116 dots per inch and the sensitivity of 93 dB.We show that the system can be used to image internal fingerprints and sweatducts with a good contrast. Finally, to demonstrate its biometric performance,we acquired subsurface fingerprint images from 240 individual fingers andestimated the equal-error-rate to be ~0.8 %. The developed instrument couldalso be used in other en face deep-tissue imaging applications because of itshigh sensitivity, such as in vivo skin imaging.

Fast subsurface fingerprint imaging with full-field optical coherence tomography system equipped with a silicon camera