Research on defect fingerprint compensation method based on optical coherence tomography

In view of the problem that traditional fingerprint devices are prone to incomplete fingerprint information due to surface noise pollution (such as scratches and peeling) when collecting fingerprints on the tip of the finger, a method using Optical Coherence Tomography (OCT) to collect subcutaneous internal fingerprints to compensate the external fingerprint information is proposed. In the experiment, a traditional fingerprint device is used to obtain the external fingerprint of the fingertip, and defective fingerprint information was obtained by erasing some information of the fingerprint with image processing technology. Then, OCT is used to collect the subcutaneous internal fingerprint, and the features are compared with the external fingerprints. The subcutaneous internal fingerprint is rotated to align with the external fingerprint. Finally, image fusion is used to complete the information of the external fingerprint on the fingertip. The experimental results show that the missing external fingerprint information can be completely replaced by the subcutaneous internal fingerprint information at the same location.