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Proceedings Paper

Limited phase modulation and its effect on phase-only correlation
Author(s): Robert W. Cohn; Joseph L. Horner
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Paper Abstract

Phase-modulating devices, especially spatial light modulators, are often incapable of producing a full 360 degrees of phase modulation. Other limitations due to calibration errors, signal distortion, and quantization can cause the actual phase modulation to differ from the desired modulation. Such limitations on the filter plane modulator can reduce the performance of phase-only correlators. We quantify these performance losses for various phase limitations, both through simulation and through the development of an approximate model of performance. In one case we quantitatively compare the performance of phase-only filters that are optimized for limited-range phase modulation (as prescribed by Juday's `minimum Euclidean distance' principle) with the performance of nonoptimal filters. In another case we analyze the effect of not compensating a quadratic dependence of phase on signal voltage which is anticipated for some spatial modulators, e.g. deformable mirror devices.

Paper Details

Date Published: 1 March 1994
PDF: 5 pages
Proc. SPIE 2237, Optical Pattern Recognition V, (1 March 1994); doi: 10.1117/12.169417
Show Author Affiliations
Robert W. Cohn, Univ. of Louisville (United States)
Joseph L. Horner, Rome Lab. (United States)


Published in SPIE Proceedings Vol. 2237:
Optical Pattern Recognition V
David P. Casasent; Tien-Hsin Chao, Editor(s)

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