Demonstration of a super-parallel holographic correlator for ultrfast database search

Shahriar, M. S.; Kleinschmit, M.; Donoghue, John; Weathers, Wesley W.; Tripathi, Renu

doi:10.1109/cleo.2002.1034476

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…As discussed in section 2, the convolution terms can be washed out by scanning continuously (Ψ1 + Ψ2) over a range of 2π at a certain frequency ωs, while keeping (Ψ1-Ψ2) zero. This can be verified through some simulation results shown in fig 5. Two identical but shifted images (as shown in fig.…”

Section: Results Of Numerical Simulationssupporting

confidence: 59%

“…Optical correlators provide a simple technique for fast verification and identification of data. Over recent years, we have been investigating the feasibility of realizing an all-optical highspeed automatic target recognition (ATR) correlator system using the inherent parallelism of optical techniques [1][2][3][4][5][6][7]. Other groups have also pursued the development of such correlators [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid optoelectronic correlator architecture for shift-invariant target recognition

et al. 2013

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In this paper, we present theoretical details and the underlying architecture of a hybrid optoelectronic correlator that correlates images using Spatial Light Modulators (SLM), detector arrays and Field Programmable Gate Array (FPGA). The proposed architecture bypasses the need for nonlinear materials such as photorefractive polymer films by using detectors instead, and the phase information is yet conserved by the interference of plane waves with the images. However, the output of such a Hybrid Opto-electronic Correlator (HOC) has four terms: two convolution signals and two cross-correlation signals. By implementing a phase stabilization and scanning circuit, the convolution terms can be eliminated, so that the behavior of an HOC becomes essentially identical to that of a conventional holographic correlator (CHC). To achieve the ultimate speed of such a correlator, we also propose an Integrated Graphic Processing Unit which would perform all the electrical processes in a parallel manner. The HOC architecture along with the phase stabilization technique would thus be as good as a CHC, capable of high speed image recognition in a translation invariant manner.

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Section: Results Of Numerical Simulationssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

et al. 2013

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“…Over recent years, our group has been investigating the feasibility of realizing a high-speed automatic target recognition system using the Translation Invariant Spatial Holographic Correlation technique (TI-SHC) 22,23,24,25,26 . Using images pre-processed via so-called polar Mellin transforms, it is also possible to make the system invariant with respect to scale and rotation 27,28,29 , while retaining the shift invariance.…”

Section: Automatic Event Recognition (Aer) Via Translation-invariant mentioning

confidence: 99%

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

Monjur

Fouda

Shahriar

2016

Optics Communications

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We describe an automatic event recognition (AER) system based on a three-dimensional spatio-temporal correlator (STC) that combines the techniques of holographic correlation and photon echo based temporal pattern recognition. The STC is shift invariant in space and time. It can be used to recognize rapidly an event (e.g., a short video clip) that may be present in a large video file, and determine the temporal location of the event. Using polar Mellin transform, it is possible to realize an STC that is also scale and rotation invariant spatially. Numerical simulation results of such a system are presented using quantum mechanical equations of evolution. For this simulation we have used the model of an idealized, decay-free two level system of atoms with an inhomogeneous broadening that is larger than the inverse of the temporal resolution of the data stream. We show how such a system can be realized by using a lambda-type three level system in atomic vapor, via adiabatic elimination of the intermediate state. We have also developed analytically a three dimensional transfer function of the system, and shown that it agrees closely with the results obtained via explicit simulation of the atomic response. The analytical transfer function can be used to determine the response of an STC very rapidly. In addition to the correlation signal, other nonlinear terms appear in the explicit numerical model. These terms are also verified by the analytical model. We describe how the AER can be operated in a manner such that the correlation signal remains unaffected by the additional nonlinear terms. We also show how such a practical STC can be realized using a combination of a porous-glass based Rb vapor cell, a holographic video disc, and a lithium niobate crystal.

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Demonstration of a super-parallel holographic correlator for ultrfast database search

Cited by 2 publications

References 3 publications

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

All optical three dimensional spatio-temporal correlator for automatic event recognition using a multiphoton atomic system

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