Abstract

Optical pattern recognition of targets immersed in noise requires a filter that has a robust response to target distortions as well as one that can be updated in real time using a spatial light modulator (SLM). The phase-with-quantized-magnitude filter (PQMF) retains sufficient magnitude information in addition to phase information to be more resistant to target distortions than phase-only filters. The PQMF algorithm exploits the 2π modularity of phase to select a quantized magnitude value that is closest to the desired magnitude given a SLM with a phase range in excess of 4 πrad.

© 1989 Optical Society of America