Phase-only joint-transform correlator: analysis and experimental results

Erbach, Peter S.; Gregory, Don A.; Hammock, Jeffery B.

doi:10.1364/ao.35.003091

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…They studied the advantages in pattern discriminability, detection efficiency and noise robustness compared to conventional JTC. Analogously a study was done also by Erbach et al 16 . The differences between Ref.…”

Section: Introductionmentioning

confidence: 64%

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Nonlinear optical time sequential correlations using phase input encoding

et al. 2004

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The presentation of nonlinear optical correlations using a joint transform correlator operating in phase-only spatial light modulation at input joint transform plane is studied here. Amplitude input nonlinear optical time sequential correlations have better discrimination and noise robustness than conventional linear correlations. These nonlinear correlations are based on decomposing reference and target into binary slices and adding the contribution of all linear correlations between them. Those correlations are implemented using a conventional joint transform correlator. However as the system has poor efficiency and low cross-correlation peak intensity working in amplitude mode, we use a phasetransformed input joint transform correlator in order to increase that efficiency and discrimination. We implement optically the phase morphological correlation and the phase sliced orthogonal nonlinear generalized correlation. We have applied the method to images degraded with high levels of substitutive noise and nonoverlapping background noise. The obtained results show how those nonlinear phase input encoded correlations have high discrimination capability detecting the target in cases where other well-known methods fail.

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Section: Introductionmentioning

confidence: 64%

“…[15] and Ref. [16] is that in the last reference the JPS was encoded as a phase distribution. Moreover Ledesma et al 17 proposed other methods for pattern recognition using phase configuration in joint transform correlator.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical time sequential correlations using phase input encoding

et al. 2004

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“…To obtain the crosscorrelation between I(x, y) and W(x, y), they are centered at x = d in the input plane to give, f(x,y)=I(x+d,y)+W(x-d,y). (9) The input plane joint image is Fourier transformed by a Fourier lens and then converted by a square-law device such as a liquid crystal light valve in the Fourier plane. The corresponding joint Fourier transform spectrum is written as…”

Section: Optical Implementationmentioning

confidence: 99%

<title>Optical implementation of hit-miss transform based on phase encoding</title>

Shuqun

Karim

1999

SPIE Proceedings

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“…The use of phase spatial light modulators has been applied to JTC implementations [11][12][13][14] to convert amplitude distributions to phase distributions in both the JPS 11 and the joint input plane. 12,13 It should be noted that, since the present spatial light modulators are capable, under certain conditions, of performing either a phase modulation or an amplitude modulation, JTC systems based only on phase modulation (phase-only systems) that can be found in the entrance or its conjugate planes have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Joint transform correlator with spatial code division multiplexing

et al. 2006

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A joint transform correlator may suffer from overlapping of the zero diffraction order of the output, which does not contain relevant information, and the correlation peaks that appear in the first diffraction orders if objects are not sufficiently separated. Such overlapping significantly reduces the signal-to-noise ratio of the identification process. We propose a novel approach based on code division multiplexing technique in which the contrast of the identification peaks is significantly enhanced. The approach does not include placing the two objects side by side but rather includes code multiplexing them. Moreover, the code division multiplexing technique allows the space-bandwidth product to be improved. Optical implementation results are given.

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Phase-only joint-transform correlator: analysis and experimental results

Cited by 15 publications

References 5 publications

Nonlinear optical time sequential correlations using phase input encoding

Nonlinear optical time sequential correlations using phase input encoding

<title>Optical implementation of hit-miss transform based on phase encoding</title>

Joint transform correlator with spatial code division multiplexing

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