Application of position encoding to a complex joint transform correlator

Yu, Francis T. S.; Lu, Guoqiang; Lü, Mingzhe; Zhao, Dazun

doi:10.1364/ao.34.001386

Cited by 26 publications

(5 citation statements)

References 13 publications

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“…For instance, electrically-small electric dipole and magnetic loop antennas radiating, respectively, in the presence of an electricallysmall isotropic, homogenous, and dispersive (lossless and lossy) -negative (ENG) and a -negative (MNG) spherical shell(s) have been proposed. They have been shown both theoretically and numerically to produce efficient electrically-small antenna systems [2,3].…”

Section: Two-dimensional Efficient Metamaterial-inspired Electricallymentioning

confidence: 99%

“…The desired cross-correlation peaks were almost overshadowed and the output detector was often saturated by the zero order. Accordingly, several research groups have investigated to improve the performance of JTC [3][4][5]. To reduce or to eliminate the zero order diffraction and to enhance the recognition ability, Lu et al [6] applied a phaseshifting technique to the CJTC and Li et al [7] proposed the JTPS subtraction strategy to accomplish the nonzero order JTC (NOJTC).…”

Section: Introductionmentioning

confidence: 99%

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Color pattern recognition using image encoding joint transform correlator

Lee

Chen

2007

Micro & Optical Tech Letters

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A color pattern recognition scheme with encoding technique based on the nonzero order joint transform correlator is proposed. Each color target image is organized as a new grayscale encoded image. A Lagrange multipliers approach is also used to design an optimized synthetic reference function. A joint transform power spectrum subtraction method is applied to remove the zero order terms in addition. Simulation results verify the performance of the proposed technique. This correlator can reduce the channel number in the input and still maintain good ability in color image recognition. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1665–1669, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22554

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Section: Two-dimensional Efficient Metamaterial-inspired Electricallymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Color pattern recognition using image encoding joint transform correlator

Lee

Chen

2007

Micro & Optical Tech Letters

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“…15 Figure 3 shows an example of the position-encoded input JTC, where a 17-quantized-level ͑nϭ17͒ QCRF had been used. The corresponding output correlation peak intensity to the sidelobe ratios are calculated, by which the detectability as a function of quantized level is plotted in Fig.…”

Section: Detectabilitymentioning

confidence: 99%

Performance of quantized composite filters in a joint transform correlator

Lü

Yin

et al. 1996

Opt. Eng

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The use of a simulated annealing algorithm to design quantized composite reference function (QCRF) filters is presented. Since the QCRF filters are spatial domain filters using finite quantization levels, they can be implemented at the output spatial light modulator of a joint transform correlator. The performance of the QCRF filters has been tested, in which we have shown that the detectability, accuracy, discriminability, and reliability improve as the quantization of the filter increases.

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“…Pixelated spatial light modulators (SLMs) can be employed to encode complex modulation by means of appropriate computer-generated holograms (CGHs) [1][2][3][4][5] . SLMs employed in this context must provide either phase-only [6][7][8][9] , real-only 10 or amplitude-only [11][12][13] modulation. Electrically addressable SLMs can provide precise, repeatable, and reconfigurable optical modulation patterns.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of commercial amplitude spatial light modulator for synthesis of general complex fields

2007

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In this work we present the numerical analysis of fully complex fields employing computer generated holograms, implemented with a commercial amplitude liquid-crystal spatial light modulator (SLM). The hologram transmittance is obtained by adding an appropriate bias function to the real cosine computer hologram of the encoded signal. For the purpose of this work, we consider an appropriated bias function for a modulator in which the amplitude transmittance is coupled with a phase modulation. This type of coupled phase appears in a commercial Twisted Nematic Liquid Crystal Display (TNLCD), configured to provide amplitude modulation, with only two polarizers as external components. This modulation curve was experimentally obtained and adjusted to a mathematical function. The numerical evaluation is done by calculating the signal to noise ratio of the reconstructed complex fields for the real modulation curve. Results show that for a good behavior for complex fields a constant bias function should be implemented. As a particular interesting case we generate propagation invariant complex beams with high accuracy and simplicity.

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Application of position encoding to a complex joint transform correlator

Cited by 26 publications

References 13 publications

Color pattern recognition using image encoding joint transform correlator

Color pattern recognition using image encoding joint transform correlator

Performance of quantized composite filters in a joint transform correlator

Numerical evaluation of commercial amplitude spatial light modulator for synthesis of general complex fields

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