Effects Of Background Noise On The Design Of Binary Phase-Only Filters

Jeffrey A. Davis; Don M. Cottrell; Timothy O. Fleck; Roger A. Lilly

doi:10.1117/12.951535

29 June 1989 Effects Of Background Noise On The Design Of Binary Phase-Only Filters

Jeffrey A. Davis, Don M. Cottrell, Timothy O. Fleck, Roger A. Lilly

Proceedings Volume 1053, Optical Pattern Recognition; (1989) https://doi.org/10.1117/12.951535
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Optical correlator systems using the binary phase-only filter (BPOF) have shown excellent performance in a variety of both theoretical and experimental studies. The output of the system represents the correlation of the input function g(x,y) with the impulse response function of the BPOF designed for a given target pattern f(x,y). Unfortunately since this impulse response function contains both the desired pattern f(x,y) and and its inverted image f(-x,-y), the correlator output contains two signals representing the correlation of g(x,y) with both f(x,y) and f(-x,-y). The phase relationship between these two contributions can be varied depending on the algorithm used to make the BPOF. This paper discusses factors which influence the performance of the BPOF when the input pattern is degraded with background noise including the location of the object used to make the filter, the extent of the background noise, the algorithm used to make the BPOF, and object features which affect the filter response. In addition we will present a Fresnel lens-encoded BPOF which very greatly reduces the correlation with the f(-x,-y) term.

Citation Download Citation

Jeffrey A. Davis, Don M. Cottrell, Timothy O. Fleck, and Roger A. Lilly "Effects Of Background Noise On The Design Of Binary Phase-Only Filters", Proc. SPIE 1053, Optical Pattern Recognition, (29 June 1989); https://doi.org/10.1117/12.951535

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