OPERATING-CURVE SELECTION FOR OPTICAL AND DIGITAL CORRELATION OF FINGERPRINTS

We present a new method for selecting the optimal spatial light modula tor operating curve on which to encode an ideal complex-valued filter function. The method is an extension of the optimization procedure tha t was used to derive the ideal complex-valued filter. To illustrate th e method we consider the selection of a typical operating curve of a c ommercially available LCD and use this operating curve to encode a fil ter that was optimized for the task of fingerprint verification. We th en extend the method to include the selection of the optimal operating curve from a series of synthetic operating curves. (C) 1998 Optical S ociety of America.