A Novel Method to Realize Optical Correlation Recognition Based on Neural Network

Xu, Peng; Yang, Tao; Liang, Kai; Li, Xiongchao; Long, Siwei; Huang, Haixuan

doi:10.1109/jphot.2018.2858568

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…The period of the fabricated terahertz wideband filter was 127.19 (53.00 + 74. 19) μm, which is close to the design value of 127.90 μm and is within the error tolerance. The duty ratio of the fabricated terahertz wideband filter was 0.417 (53.00/127.…”

Section: Production and Performance Testingsupporting

confidence: 78%

“…The duty ratio of the fabricated terahertz wideband filter was 0.417 (53.00/127. 19) and the design value is 0.414, which is within the error tolerance.…”

Section: Production and Performance Testingmentioning

confidence: 68%

“…Based on the research on sub-wavelength optical design and application accumulated by our research group [10][11][12][13][14][15][16][17][18][19], this paper proposes a method based on a simple periodic binary sub-wavelength structure [12,13] to design a terahertz broadband filter. A silicon-based terahertz wideband filter with a center frequency of 4.07 THz was designed.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Wideband Filter Based on Sub-Wavelength Binary Simple Periodic Structure

et al. 2019

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In this paper, a silicon-based terahertz wideband filter was designed using rigorous couple wave theory to achieve high diffraction efficiency and wideband filtering performance. The optimal parameters, such as filter period, duty ratio, and groove depth, are given. The design value and tolerance analysis were carried out to obtain the allowable deviation range of each structural parameter of the filter. The device was fabricated and tested for performance. The experimental results were consistent with the design results, proving the feasibility of the design method and can be applied in terahertz, communication, imaging, and other fields.

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Section: Production and Performance Testingsupporting

confidence: 78%

“…The duty ratio of the fabricated terahertz wideband filter was 0.417 (53.00/127. 19) and the design value is 0.414, which is within the error tolerance.…”

Section: Production and Performance Testingmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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Terahertz Wideband Filter Based on Sub-Wavelength Binary Simple Periodic Structure

et al. 2019

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“…As compared to a traditional OTSDF (optimized trade-off synthetic discriminant function) filter, an up to 1402.4% increase of the correlation peak index was observed. As compared to the NNCRF (neural network correlation recognition filter), proposed more recently by [ 113 ] (which in turn had obtained a 306.7% increase as compared to the OTSDF filter), the NNRRF achieved better performance in terms of the recognition ability invariant to distortions. The proposed filter was used in a planar integrated 2f optical correlator and was validated by experiments in a real setup.…”

Section: Recent Applications and Implementations Of Optical Correlatorsmentioning

confidence: 97%

Optical Correlators for Cryptosystems and Image Recognition: A Review

Drăgulinescu

2023

Sensors

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Optical correlators are efficient optical systems that have gained a wide range of applications both in image recognition and encryption, due to their special properties that benefit from the optoelectronic setup instead of an all-electronic one. This paper presents, to the best of our knowledge, the most extensive review of optical correlators to date. The main types are overviewed, together with their most frequent applications in the newest contributions, ranging from security uses in cryptosystems, to medical and space applications, femtosecond pulse detection and various other image recognition proposals. The paper also includes a comparison between various optical correlators developed recently, highlighting their advantages and weaknesses, to gain a better perspective towards finding the best solutions in any specific domain where these devices might prove highly efficient and useful.

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“…It enables the optical correlator to easily recognize the distortion target, and each index is greatly improved, but in terms of rotational distortion, it can only recognize the left and right rotations distortion of 50 degrees according to the existing reports. [16] In conclusion, optical correlators applying existing filters still have difficulty in recognizing large rotational angle distortion targets An optical filter is a phase-type device consisting of multiple phase points. The key to the design is to solve the optimal combination of phase points.…”

Section: Introductionmentioning

confidence: 99%

Research on 2F Optical Correlator Based on Neural Network Filter for Recognizing Large-Angle Rotation Distortion Target

et al. 2020

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It is difficult for optical correlator to recognize the target with large rotation distortion by using existing filters. To solve this problem, a new neural network model is constructed based on the physical recognition process of planar integrated 2F optical correlator. The new optical filter is optimized by training the neural network. The planar integrated 2F optical correlator can output sharp correlation peaks by using the new filter to recognize targets with arbitrary rotation distortion. Compared with the traditional OTSDF filter, the average increase of correlation peak index is up to 1402.4%, while the recognition performance of distortion invariant is also better than the new NNCRF filter. The simulation and experimental results show that the optical filter designed in this paper can effectively solve the problem of weak recognition ability of optical correlator for rotating distortion targets, especially for large angle rotating distortion targets.

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A Novel Method to Realize Optical Correlation Recognition Based on Neural Network

Cited by 6 publications

References 24 publications

Terahertz Wideband Filter Based on Sub-Wavelength Binary Simple Periodic Structure

Terahertz Wideband Filter Based on Sub-Wavelength Binary Simple Periodic Structure

Optical Correlators for Cryptosystems and Image Recognition: A Review

Research on 2F Optical Correlator Based on Neural Network Filter for Recognizing Large-Angle Rotation Distortion Target

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