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Optical Engineering

Nonlinear joint transform correlator using one-dimensional Fourier transformation
Author(s): Ben Rodriguez; Alfredo Dubra; Carlos Martinez; Gonzalo Escuder; Jose A. Ferrari
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Paper Abstract

We present a new method for processing the data in a nonlinear joint transform correlator (NJTC). The output of the NJTC is obtained after two steps. The first step consists of the acquisition of the joint power spectrum (JPS) of the images to be correlated. The JPS is in principle a bidimensional image. The second step is the calculation of the cross-correlation function. To do this, the JPS image is compressed to one dimension and a 1-D Fourier transform is performed. This significantly reduces the number of operations required to evaluate the crosscorrelation. To improve the cross-correlation sensitivity, a degree of nonlinearity is introduced using an illumination level above the saturation threshold of the camera used to acquire the JPS.

Paper Details

Date Published: 1 October 1998
PDF: 6 pages
Opt. Eng. 37(10) doi: 10.1117/1.601809
Published in: Optical Engineering Volume 37, Issue 10
Show Author Affiliations
Ben Rodriguez, Instituto de Fisica (Belgium)
Alfredo Dubra, Instituto de Fisica (Uruguay)
Carlos Martinez, Instituto de Fisica (Uruguay)
Gonzalo Escuder, Instituto de Fisica (Uruguay)
Jose A. Ferrari, Instituto de Fisica (Uruguay)


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