FINGERPRINT VERIFICATION USING OPTICAL SHIFTED PHASE ENCODED JOINT TRANSFORM CORRELATION

Automatic fingerprint verification is an important tool of any security and monitoring systems. An optical joint transform correlation technique is proposed for efficient real-time recognition of fingerprints. The proposed technique employs optical lenses and spatial light modulators to process the given images and hence it can yield the verification decision almost instantaneously. The optical correlator is modified by incorporating phase shifting and phase encoding of the reference fingerprint to avoid unnecessary correlation signals and hence make the best utilization of the space and bandwidth resources. The given input image of fingerprint is correlated directly with the reference fingerprint and a highly distinctive correlation signal is produced if the given fingerprint is of an authorized person, while a negligible correlation signal is produced for all unauthorized fingerprints. The proposed technique is capable of recognizing multiple authorized fingerprints simultaneously in a given input scene containing more than one fingerprint. Performance of the proposed techniques is investigated through computer simulation involving real-life fingerprint images.