High-speed hybrid optical/digital correlator system

Young, Rupert; Chatwin, Christopher R.; Scott, Barbara

doi:10.1117/12.146387

Cited by 23 publications

(7 citation statements)

References 22 publications

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“…It is reported that as pixel size of SLM shrinks to less than 10 mm, environmental perturbations such as mechanical and thermal stability of the correlator becomes even more of an issue, when it may have to operate in highly demanding conditions, may be under high g force loads [5]. Hence the SLM being used in the system of pixel size less than 10 mm is not recommendable for a field employable system.…”

Section: Sbp Of the Correlator Systemmentioning

confidence: 98%

“…The scaling operation has no effect on the SBP [17]. The scaling criteria is governed by the following expression [5]:…”

Section: Sbp Of the Correlator Systemmentioning

confidence: 99%

“…Young and his co-workers in 1993 outlined an opticaldigital hybrid correlator system that allows the potential for a multikilohertz reference template search on data acquired at video rates [5][6][7][8]. In this hybrid digital-optical correlation approach, the input data is digitally Fourier transformed and is multiplied with the digitally presynthesized distortion-invariant filters, and the product function is displayed over an electrically addressed spatial light modulator (SLM).…”

Section: Introductionmentioning

confidence: 99%

“…Pattern recognition using optical techniques, one of the most important and promising applications, has generated considerable amount of interest in the optics community for last few decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. As a result, optical correlator systems have now been started appearing in the market place [15].…”

Section: Introductionmentioning

confidence: 99%

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Influence of perturbations in a hybrid digital-optical correlator

Bhagatji

Nishchal

Beri

et al. 2007

Optics and Lasers in Engineering

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Section: Sbp Of the Correlator Systemmentioning

confidence: 98%

“…The scaling operation has no effect on the SBP [17]. The scaling criteria is governed by the following expression [5]:…”

Section: Sbp Of the Correlator Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of perturbations in a hybrid digital-optical correlator

Bhagatji

Nishchal

Beri

et al. 2007

Optics and Lasers in Engineering

View full text Add to dashboard Cite

“…Young and his co-workers in 1993 outlined an optical-digital hybrid correlator system that allows the potential for a multikilohertz reference template search on data acquired at video rates [24][25][26][27] . In this hybrid approach, the input data is digitally Fourier transformed and multiplied with the digitally pre-synthesized distortion-invariant filters.…”

Section: Introductionmentioning

confidence: 99%

A hybrid digital-optical correlator for automatic target recognition

2007

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Detection of rotationally distorted targets is a challenging task in pattern recognition applications. Recently, we proposed and implemented a wavelet-modified maximum average correlation height (MACH) filter for in-plane and out-of-plane rotation invariance in hybrid digital-optical correlator architecture. Use of wavelet transform improved the performance of the MACH filter by reducing the number of filters required for identifying a rotated target and enhancing the correlation peak intensity significantly. The output of a hybrid digital-optical correlator contains two autocorrelation peaks and a strong dc. To capture a desired single autocorrelation peak a chirp function with the wavelet-modified MACH filter was used. The influence of perturbations in hybrid digital-optical correlator has also been studied. Perturbations include, the effect of occlusion on input target, the effect of additive and multiplicative noise and their combined effect on input target, and the effect of occlusion of product function to be optically processed for obtaining the correlation outputs. The present paper reviews investigations on the hybrid digital-optical correlation scheme with special reference to the work carried out at the Photonics Division, IRDE Dehradun.

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