Abstract

Horner and Gianino¹ suggested a phase-only filter of unit modulus as a correlation filter for pattern recognition. This filter consists of the phase of the classical matched filter and Is commonly referred to as “the” phase-only filter (POF). The POF has the potential of 100% light throughput efficiency, and it has been demonstrated to yield sharp correlation peaks in pattern recognition applications. Kumar and Bahri² have shown that the POF is the optimum unit modulus filter with respect to the SNR. The peak-to-sldelobe ratio for a filter is a measure of performance with respect to false targets and dynamic range. The authors suggest that the optimal bandlimited unit modulus filter should maximize

© 1988 Optical Society of America