PERFORMANCE OF A PHOTOREFRACTIVE JOINT TRANSFORM CORRELATOR FOR FINGERPRINT IDENTIFICATION

A photorefractive joint transform correlator is connected to a PC-base d image processing board and tested for fingerprint recognition. Disto rtions due to rotation, scale, and partial hiding are considered: +/-4 deg in rotation, +/-7% in scale, and up to 80% hiding can be handled by the correlator. The performance of the correlator operating with a real-time fingerprint acquisition camera is then measured. The capture d fingerprint is generally distorted with respect to its original coun terpart stored in the PC memory. These distortions are mostly due to t he positioning and pressure of the finger on the glass prism of the ca mera. We evaluate the recognition performance qualitatively and statis tically with these distortions on a limited data bank and demonstrate 80% successful recognition rate.