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Proceedings Paper

Shift and scale-invariant correlator using a radially stretched phase-only filter
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Paper Abstract

A radial stretching of the phase only filter depending on the energy angular distribution of the target spectrum is used to perform shift and scale invariant pattern recognition. The complex conjugate of a basic size target Fourier transform and the cumulative energy angular distribution are calculated. Then the radially stretched filter providing the same energy contribution to the correlation peak independent on the target size is prepared and used in a conventional correlator, with spherical-wave illumination. The maximum scale ratio of recognizable objects equals 1:1.5. Computer simulations and experimental results, showing the performance of the filter are presented.

Paper Details

Date Published: 8 March 1995
PDF: 3 pages
Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); doi: 10.1117/12.203464
Show Author Affiliations
Dan Cojoc, Politehnica Univ. of Bucharest (Romania)
Javier Garcia, Univ. of Valencia (Spain)
Carlos Ferreira, Univ. of Valencia (Spain)
Eugene O. Curatu, Politehnica Univ. of Bucharest (Romania)

Published in SPIE Proceedings Vol. 2461:
ROMOPTO '94: Fourth Conference in Optics
Valentin I. Vlad, Editor(s)

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