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

Dan Cojoc; Javier Garcia; Carlos Ferreira; Eugene O. Curatu

doi:10.1117/12.203464

8 March 1995 Shift and scale-invariant correlator using a radially stretched phase-only filter

Dan Cojoc, Javier Garcia, Carlos Ferreira, Eugene O. Curatu

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203464
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

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.

Citation Download Citation

Dan Cojoc, Javier Garcia, Carlos Ferreira, and Eugene O. Curatu "Shift and scale-invariant correlator using a radially stretched phase-only filter", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203464

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