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Proceedings Paper

Invariant joint transform correlator
Author(s): David Mendlovic; Emanuel Marom; Naim Konforti
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Paper Abstract

The joint transform correlator operation has been extended to include complex reference images. Such amplitude and phase images are involved when using single harmonic images (circular radial logarithmic etc. ) in correlation setup. The analysis of a rotation invariant pattern recognition system using joint transform correlators principles is described followed by experimental results that can be obtained in real time. The optical joint transform correlator is based on recording the Fourier transform simultaneously displayed by a pair of 2-D functions and then generate the transform of this pattern. Yu and Liu1 applied this technique to real time pattern recognition configurations by using spatial light modulators (SLMs) in the optical system. The joint transform correlator preserves shift invariant pattern recognition property but has high sensitivity to other invariant parameters such as rotation scale projection etc. It has been recently shown25 that the classical correlator configuration can be made invariant to one additional parameter (i. e. angular orientation scale changes projections) by using a matched filter containing only a part of the input data. We will demonstrate in this paper an invariant joint transform correlator by using a single harmonic of the stored pattern as the reference object.

Paper Details

Date Published: 1 July 1990
PDF: 2 pages
Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.34767
Show Author Affiliations
David Mendlovic, Tel Aviv Univ. (Israel)
Emanuel Marom, Tel Aviv Univ. (Israel)
Naim Konforti, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 1319:
Optics in Complex Systems
F. Lanzl; H.-J. Preuss; G. Weigelt, Editor(s)

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