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12th Chinese conference on Advances in Image and Graphics Technologies, IGTA 2017

作者： Hu, Gensheng Li, Min Liang, Dong Bao, Wenxia School of Electronics and Information Engineering Anhui University Hefei230601 China Anhui Key Laboratory of Polarization Imaging Detection Technology Hefei230031 China

ISBN: (纸本)9789811073885

A group activities recognition algorithm is proposed by combining M-DTCWT (multi directional dual tree complex wavelet transform) with elliptic Mahalanobis metric. M-DTCWT is composed of directional filter bank in cascade with dual tree complex wavelet transform. By using the M-DTCWT to decompose the human images in videos for multi-scale and multi-direction, the high and low frequency coefficients can be obtained. The texture features of the high and low frequency coefficients are extracted by using improved local binary pattern and gray level co-occurrence matrix and classified by using elliptic Mahalanobis metric. According to the results of classification, group activities are recognized. Experimental results on Group activity video set and self built video set show that the proposed algorithm has higher recognition accuracy than the existing algorithms and Euclidean metric algorithm. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Security systems

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Enhanced Two Dimensional Turntable Radar imaging Using Minimal Sparse Nonconvex Optimization 8

Enhanced Two Dimensional Turntable Radar Imaging Using Minim...

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8th Symposium on Novel Photoelectronic detection technology and Applications

作者： Wang, Shuo Lu, Xinfei Wu, Lingxia Key Laboratory of Polarization Imaging Detection Technology Anhui Province Hefei230031 China The Chinese Academy of Sciences Key Laboratory of Electromagnetic Space Information University of Science and Technology of China Hefei230027 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Compressed sensing (CS) techniques have shown promise for radar imaging applications due to the excellent images they can produce. In this paper, a two dimensional (2D) sparse signal model for turntable radar imaging is developed, and a 2D CS based image reconstruction algorithm with a hyperbolic tangent constraint is proposed to improve the imaging performance and avoid the huge computational burden of 1D CS based methods, which require a tremendous amount of memory and computational resources. The augmented Lagrange multiplier and a 2D iterative soft thresholding function are used for solving the minimally sparse nonconvex optimization problem with parameter adjustment. Moreover, its convergence can be proved. Experimental results are presented to demonstrate the validity of the proposed approach. © 2022 SPIE

关键词： Radar imaging

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A Novel Design of Dual-Band Microstrip Filter Antenna

A Novel Design of Dual-Band Microstrip Filter Antenna

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2016 IEEE Advanced Information Management,Communicates,Electronic and Automation Control Conference(IMCEC 2016)

作者： Qi Liu Chuansong Yu Xianliang Wu Shuo Wang Zhongxiang Zhang Department of Electronic and Information Engineering Anhui University Key Laboratory of Polarization Imaging Detection Technology Anhui Province Department of Electronic and Information Engineering Hefei Normal University

ISBN: (纸本)9781509001668

This paper introduces the design of a novel planar ultra-wideband filtering *** new filter antenna has dual band notched characteristics in 5.5GHz and *** consists of an ultra-wideband（UWB） filter and an *** the filter,the E-shaped mode is used to realize the two transmission zeros and the double notch characteristics of the ultra-wideband pass *** stopband characteristics are achieved through the two U-shaped slot in the E-shaped *** frequencies in 5.5GHz and 7.5GHz of the two notching points can be adjusted *** is proved by simulation software HFSS that different sizes of U-shaped slots will affect notched characteristics of the *** simulation and measurement results show that the antenna can not only achieve impedance matching ranging from 3.5GHz to 10.6GHz,but also can effectively avoid the wireless Interference of WLAN（WLAN） frequency band（5.2 ~ 5.8 GHz）,and X band satellite communication system（7.25 ~ 7.75 GHz）.

关键词： ultra-wideband antenna(UWB) band-notched characteristics U-shaped slot filter antenna

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Recognition of Group Activities Using Complex Wavelet Domain Based Cayley-Klein Metric Learning

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Journal of Beijing Institute of technology 2018年第4期27卷 592-603页

作者： Gensheng Hu Min Li Dong Liang Mingzhu Wan Wenxia Bao Key Laboratory of Intelligent Computing and Signal Processing Ministry of EducationAnhui University Hefei 230039China School of Electronics and Information Engineering Anhui UniversityHefei 230601 China School of Information Science and Technology Fudan UniversityShanghai 200433China Anhui Key Laboratory of Polarization Imaging Detection Technology Hefei 230031China

A group activity recognition algorithm is proposed to improve the recognition accuracy in video surveillance by using complex wavelet domain based Cayley-Klein metric ***-sampled dual-tree complex wavelet packet transform(NS-DTCWPT)is used to decompose the human images in videos into multi-scale and *** improved local binary pattern(ILBP)and an inner-distance shape context(IDSC)combined with bag-of-words model is adopted to extract the decomposed high and low frequency coefficient *** extracted coefficient features of the training samples are used to optimize Cayley-Klein metric matrix by solving a nonlinear optimization *** group activities in videos are recognized by using the method of feature extraction and Cayley-Klein metric *** results on behave video set,group activity video set,and self-built video set show that the proposed algorithm has higher recognition accuracy than the existing algorithms.

关键词： video surveillance group activity recognition non-sampled dual-tree complex wavelet packet transform(NS-DTCWPT) Cayley-Klein metric learning

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A high accuracy image registration method research of polarization 3

A high accuracy image registration method research of polari...

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3rd International Symposium on Monitoring, Early Warning, Removal technology of Space Targets and Debris, the 4th International Conference on Frontiers in Optical imaging technology and Applications, and the 2nd International Symposium on Photoelectric Defense Technologies

作者： Wang, Xiaolong Zeng, Xianfang Yuan, Hongwu Wang, Feng Key Laboratory of Polarization Imaging Detection Technology Anhui Province Hefei230031 China Anhui Water Conservancy Technical College Anhui Province Hefei231603 China

ISBN: (数字)9781510607286

ISBN: (纸本)9781510607279

The difficult point that impacting the traditional polarization image registration based on Fourier-Mellin transform is calculating rotation angle of the image α and shrinkage variable coefficient τ of polarization image *** on Fourier-Mellin transform method, this paper proposes a improved algorithm that on account of improving resolution in the Î coordinate direction in the Log-polar coordinate system, improve the calculation accuracy of rotation angle of the image α and shrinkage variable coefficient τ.Through the experiment and simulation results show that the improved algorithm than the traditional has higher registration precision. © 2016 SPIE.

关键词： Image registration

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Research on Infrared polarization Noise Suppression and Target detection Methods in Cloud Background 6

Research on Infrared Polarization Noise Suppression and Targ...

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6th Conference on Frontiers in Optical imaging and technology: imaging detection and Target Recognition

作者： Fan, Yang Qiheng, Huang Beiyao, Cui Army Academy of Artillery and Air Defense of PLA Hefei Anhui230031 China Anhui Provincial Key Laboratory of Polarization Imaging Detection Technology Hefei230031 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

In order to reduce the impact of cloud clutter on target detection in infrared polarization images under sky background, a target detection method based on maximally stable external regions (MSER) is proposed. Firstly, subtract each pixel of the infrared polarization image from the mean of the vertical and horizontal directions of the image. The non positive pixel is the cloud background, and the grayscale value is set to 0 to obtain the cloud clutter background suppression polarization image. Then, using geometric feature constraints, the final aircraft target detection result is obtained by setting a reasonable aspect ratio threshold and the contrast threshold between the target and the background, removing non target areas such as cloud edge clutter and ripples. Two indicators, accuracy and recall, were used to evaluate the detection performance. The experimental results showed that the clutter suppression and target detection methods studied in this paper can effectively suppress the adverse effects of cloud clutter on detecting aircraft targets in infrared polarized images under different thickness cloud sky scenes, and the detection effect is significantly improved. © 2024 SPIE. All rights reserved.

关键词： Aspect ratio

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A blind element detection and correction method for pixel coupled infrared polarization imaging system 9

A blind element detection and correction method for pixel co...

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9th Symposium on Novel Photoelectronic detection technology and Applications

作者： Fan, Yang Juan, Zhao Army Academy of Artillery and Air Defense of PLA Anhui Hefei230031 China Anhui Provincial Key Laboratory of Polarization Imaging Detection Technology Hefei230031 China

ISBN: (纸本)9781510664432

In order to improve the accuracy of pixel coupled infrared polarization imaging system, based on the analysis of the characteristics of blind elements, a blind element detection and correction method based on the nearest neighbor parameter is proposed. Blind elements are detected by two-way derivative operation in Stokes vector, the concepts of nearest neighbor and reference polarization pixel are introduced, and the identification methods of fixed blind elements, random blind elements and point targets are classified, According to the polarization parameter distribution in the neighborhood of the blind element, the blind element correction is realized. The experimental results show that this method can effectively improve the acquisition ability of polarization information of incident light, reduce the system error, and improve the detection accuracy of the pixel coupled polarization imaging system. © 2023 SPIE.

关键词： Pixels

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Numerical Validation of A Simple Dynamic Beam Filtration Strategy in Cone Beam CT

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集成技术 2025年第2期14卷 71-85页

作者： WANG Heran XIE Jixiong ZHU Jiongtao ZHANG Xin TAN Yuhang SU Ting GE Yongshuai Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Research Center for Advanced Detection Materials and Medical Imaging Devices Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Paul C.Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of SciencesShenzhen 518055China

For cone beam computed tomography(CBCT),there has long been a desire to modulate the intensity and distribution of the X-rays to accommodate the patient’s anatomy as the gantry rotates from one projection to *** would reduce both image artifacts and radiation ***,the current beam modulation setups,such as dynamic bowtie filters,may be too complex for practical use in clinical *** study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation *** this study,the beam filtration was designed to vary dynamically as the CBCT gantry rotates around the ***,two distinct components were integrated:the sheet filter part and the bowtie filter *** dynamic beam filtration setup has two working schemes,one is a combination of dynamic sheet filter and dynamic bowtie filter,denoted as dynamic filterdynamic bowtie(DFDB);the other is a combination of dynamic sheet filter and static bowtie filter,denoted as dynamic filter-static bowtie(DFSB).Numerical imaging experiments were performed for three human body parts:the shoulder,chest,and *** addition,the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution *** showed that the proposed DFDB and DFSB beam filtration schemes can significantly reduce the image artifacts and thus improve the CBCT image *** on the scanned object,the total radiation dose could be reduced by 30%.The proposed simple dynamic beam filtration strategy,especially the DFSB approach,could be beneficial in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

关键词： dynamic filtration radiation dose reduction artifacts reduction cone beam computed tomography

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Structural Damage detection and Localization Using Response Difference Transmissibility

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Journal of Shanghai Jiaotong university(Science) 2024年第6期29卷 1126-1138页

作者： WANG Zengwei DING Lei Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detection and Imaging TechnologyChinese Academy of SciencesShanghai 200083China

In this paper,a novel method is proposed for structural damage detection and *** key of the proposed method is the use of the response difference transmissibility(RDT)for damage *** RDT is defined to relate response differences of the system to be evaluated and those of the original *** invariance properties of RDT are also *** on this,a damage indicator is proposed,and the benefits are verified by a numerical ***,the proposed method is illustrated and validated by finite element simulations and experimental case studies.

关键词： damage detection damage localization transmissibility mechanical vibrations

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Research on the novel concentration sensor based on multi-longitudinal mode laser interference 9

Research on the novel concentration sensor based on multi-lo...

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9th Symposium on Novel Photoelectronic detection technology and Applications

作者： Wang, Chenchen Xu, Yao Zu, Hongyu Gu, Kang Huang, Qiheng Huang, Qinchao Wang, Yong Anhui Provincial Key Laboratory of Polarization Imaging Detection Technology He Fei230031 China Army Academy of Artillery and Air Defense PLA Anhui Hefei230031 China

ISBN: (纸本)9781510664432

In this paper, a novel non-contact optical measurement method based on the principle of laser self mixing interference for measuring liquid concentration is proposed. The optical path difference caused by changing the concentration of the solution, we found the phenomenon of waveform separation in the laser self-mixing vibration signal. In this system, simulation results of different solution concentrations are obtained based on the feature that each longitudinal mode is independent and do not interfere with each other in the multi-longitudinal mode laser, which successfully verified the corresponding relationship between the degree of waveform separation and the concentration of the solution. © 2023 SPIE.

关键词： Optical data processing

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