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Optical Engineering

Off-axis phase-only filter for pattern recognition
Author(s): Qing Tang; Erwin Jaeger; Theo T. Tschudi
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Paper Abstract

A new kind of amplitude-encoded phase-only filter (AE POF) is presented. The interference of the Fourier phase value with a tilted plane reference wave encodes the pure Fourier phase information of the object wave and results in an off-axis phase-only filter (OA POF). After the binarization step the filter function is recorded directly into the recording medium in final size using a laser scanner. Comparing them with the conventional matched filter, the conventional phase-only filter, and the AE POF, as well as their binary versions, we discuss the performances of OA POFs (OA BPOFs), present computer simulations, and demonstrate experimental results.

Paper Details

Date Published: 1 November 1990
PDF: 6 pages
Opt. Eng. 29(11) doi: 10.1117/12.55731
Published in: Optical Engineering Volume 29, Issue 11
Show Author Affiliations
Qing Tang, Univ. of Connecticut (United States)
Erwin Jaeger, Technische Hochschule Darmstadt (Germany)
Theo T. Tschudi, Technische Hochschule Darmstadt (Germany)

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