<title>Extended optical correlator system: properties and applications</title>
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Abstract:
The extended optical correlator system is a three-lens coherent correlator with the three separated planes available for spatial filtering of signals. The preprocessing of signals in two separated planes is also separated from the matched filtering. A typical preprocessing procedure is presented. Usefulness of a special type of matched filter referred to as the quasi phase-only filter is also discussed.Keywords:
Optical correlator
Matched filter
Spatial filter
In this paper, we compare the performance of the bipolar joint transform correlator to the continuous phase-only matched filter correlator, the binary phase-only matched filter correlator, and the classical correlator. The pattern recognition systems will be compared in the areas of correlation peak, autocorrelation peak to sidelobe ratio, autocorrelation bandwidth, and discrimination sensitivity.
Optical correlator
Matched filter
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A new type of matched spatial filter referred to as the quasi phase-only filter (QPOF) has been recently introduced as an optical solution for the phase-only filtering concept. The high-efficiency attribute has been found to link the QPOFs and phase-only filters (POFs). Using computer simulation experiments, the properties of QPOFs are discussed in terms of a signal-to-noise ratio, a peak-to-sidelobe ratio, ability to discriminate, and also the general behavior of the output correlation signals.
Optical correlator
Spatial filter
Matched filter
SIGNAL (programming language)
Optical engineering
Linear filter
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The extended optical correlator system is a three-lens coherent correlator with the three separated planes available for spatial filtering of signals. The preprocessing of signals in two separated planes is also separated from the matched filtering. A typical preprocessing procedure is presented. Usefulness of a special type of matched filter referred to as the quasi phase-only filter is also discussed.
Optical correlator
Matched filter
Spatial filter
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Citations (0)
We compare the performance of the nonlinear joint transform correlator, the nonlinearly transformed filter based correlator, and the conventional linear correlator. The pattern recognition systems are compared in the areas of correlation peak, peak to sidelobe ratio, and correlation width. We show that for some noisy input scenes, the linear correlator produces an autocorrelation peak that is smaller than the maximum cross-correlation signal, resulting in false signal detection. On the other hand, compared to the linear correlator, both types of nonlinear correlators produce better correlation performance.
Optical correlator
Matched filter
SIGNAL (programming language)
Linear filter
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The techniques used for storing matched filters in image processing units of the optical matched filter image correlator (OMFIC) type determine to a large extent the capacity and discrimination of the complete system. Coherent and non-coherent addition of images for overlayed matched filter recording are investigated and reported upon. Results are related by performance in the areas of diffraction efficiency and signal-to-clutter measurements. Dichromated gelatins are used as matched filter recording media and the results compared with silver salt photographic materials. Finally, a formula is derived for matched filter capacity and the analysis extended to the case where the medium sets the resolution for matched filter recording.
Matched filter
Optical correlator
SIGNAL (programming language)
Composite image filter
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Optical correlator
Spatial filter
Matched filter
Spatial frequency
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Citations (3)
In this paper, we compare the performance of the bipolar joint transform correlator to the continuous phase-only matched filter correlator, the binary phase-only matched filter correlator, and the classical correlator. The pattern recognition systems will be compared in the areas of correlation peak, autocorrelation peak to sidelobe ratio, autocorrelation bandwidth, and discrimination sensitivity.
Optical correlator
Matched filter
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Citations (8)
A technique for optical pattern recognition using an amplitude-compensated matched filter is presented. With the synthetic discriminant function in a matched spatial filtering application an iterative technique is employed to first obtain the synthetic discriminant functions for the phase-only matched filter and then is extended to the amplitude-compensated matched filter. Computer simulation shows that the suggested spatial filter has a high signal-to-noise ratio and good Horner efficiency, and it is more sensitive to changes in the input image.
Matched filter
Spatial filter
Optical correlator
Spatial frequency
SIGNAL (programming language)
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A simple optoelectronic system for high-speed determination of binary phase-only filters for use in an optical correlator is described. Filters determined using the system were implemented using a liquid crystal spatial light modulator in the Fourier plane of an optical correlator. Results demonstrating the operation of the system are presented.
Optical correlator
Spatial light modulator
Optical engineering
Binary data
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We compare the performances of the binary joint transform correlator, the continuous phase-only matched filter correlator, the binary phase-only matched filter correlator, and the classic correlator for a limited set of patterns. Areas of comparison are the correlation peak, autocorrelation peak to sidelobe ratio, autocorrelation width, and discrimination sensitivity. In these areas, it is shown that the performance of the binary joint transform correlator is similar to the phase-only matched filter correlator.
Optical correlator
Matched filter
Binary data
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Citations (19)