Nonlinear Joint Transform Correlator

Abstract

Experiments are provided to investigate the nonlinear joint transform correlator (JTC). Experiments are used to determine the correlation peak intensity, signal to noise ratio (SNR), peak to sidelobe ratio (PSR), and correlation width for various degrees of the nonlinearity used at the Fourier plane. The system is implemented using an optically addressed spatial light modulator in the Fourier plane. The experiments show that for the images used here, nonlinear compression of the joint power spectrum is necessary to pull the signal out of scene noise and produce a peak to sidelobe ratio of larger than unity. In addition the sensitivity of the nonlinear JTC to the scaling and rotational changes of the input objects for various degrees of the nonlinearity applied to the joint power spectrum is investigated. The effect of the modulation transfer function of the spatial light modulator on the nonlinear JTC performance in the presence of multiple input targets is discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1992
Accession Number
ADA258329

Entities

People

  • Bahram Javidi

Organizations

  • University of Connecticut

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carrier Frequencies
  • Electrical Engineering
  • Electro-Optics
  • Gray Scale
  • Images
  • Information Processing
  • Information Systems
  • Lasers
  • Modulators
  • Optical Modulators
  • Optics
  • Pattern Recognition
  • Photographs
  • Power Spectra
  • Recognition
  • Signal Processing
  • Transfer Functions

Fields of Study

  • Engineering
  • Physics

Readers

  • Computer Vision.
  • Radar Systems Engineering.
  • Wave Propagation and Nonlinear Chaotic Dynamics.