Nonlinear joint transform optical correlator having varying degr

Details Nonlinear joint transform optical correlator having varying degr Nonlinear joint transform optical correlator having varying degr

1990-06-14

1992-06-02

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

364822, 359561, G06K 964

Patent

active

051194430

ABSTRACT:
In a nonlinear joint transform image correlator, the Fourier transform interference intensity is nonlinearly transformed to provide higher correlation peak intensity and a better defined correlation spot. The correlation signals are determined, for example, in terms of nonlinear characteristics of a spatial light modulator (SLM) at the Fourier plane. The correct phase information of the correlation signal is recovered from the first-order harmonic of the nonlinearly transformed interference intensity, and various types of autocorrelation signals can be produced simply by varying the severity of the nonlinearity and without the need to synthesize specific matched filters. For example, the autocorrelation signal produced by a phase-only matched filter can be obtained by selecting the appropriate nonlinearity.

REFERENCES:
patent: 4357676 (1982-11-01), Brown
patent: 4539651 (1985-09-01), Ludman
patent: 4695973 (1987-09-01), Yu
patent: 4765714 (1988-08-01), Horner et al.
patent: 4832447 (1989-05-01), Javidi

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