Optimizing binary phase and amplitude filters for PCE, SNR, and discrimination

John D. Downie

doi:10.1117/12.138321

1 July 1992 Optimizing binary phase and amplitude filters for PCE, SNR, and discrimination

John D. Downie

Proceedings Volume 1701, Optical Pattern Recognition III; (1992) https://doi.org/10.1117/12.138321
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Binary phase-only filters (BPOFs) have generated much study because of their implementation on currently available spatial light modulator devices. On polarization-rotating devices such as the magneto-optic SLM, it is also possible to encode binary amplitude information into two SLM transmission states, in addition to the binary phase information. This is done by varying the rotation angle of the polarization analyzer following the SLM in the optical train. Through this parameter, a continuum of filters may be designed that span the space of binary phase and amplitude filters (BPAFs) between BPOFs and binary amplitude filters. In this study, we investigate the design of optimal BPAFs for the key correlation characteristics of peak sharpness (through the PCE metric), SNR, and discrimination between in-class and out-of- class images. We present simulation results illustrating improvements obtained over conventional BPOFs, and trade-offs between the different performance criteria in terms of the filter design parameter.

Citation Download Citation

John D. Downie "Optimizing binary phase and amplitude filters for PCE, SNR, and discrimination", Proc. SPIE 1701, Optical Pattern Recognition III, (1 July 1992); https://doi.org/10.1117/12.138321

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