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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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CMOS amplifier for neural signal recording applications

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key Engineering Materials 2015年 645卷 1279-1284页

作者： Zhang, Zhang Cheng, Zhengxi Zhuang, Yiwei Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China State Key Laboratory of ASIC and System Fudan University Shanghai200433 China School of Electronic Science and Applied Physics Hefei University of Technology Hefei Anhui230009 China

A low power low noise CMOS amplifier with integrated filter for neural signal recording is designed and fabricated with CSMC 0.5 μm CMOS process. DC offsets introduced by electrode-tissue interface are rejected through a feedback low-pass filter. The bandwidth of the amplifier is in 3.5Hz-5.5KHz range, and the gain is about 48dB in the midband. AC input differential mode voltage range is 10mV, and DC input differential mode voltage range is 180mV. The amplifier can accommodate 180mV DC offsets drift and 10mV neural spikes. The neural probe array is integrated directly on the surface of the amplifier array chip, and is tested in saline solution, and also is implanted in rats in vivo, the results of the experiments show that the amplifier is suitable for neural signal recording. The power dissipation is about 14μW while consuming 0.16 mm2 of chip area, which satisfies implantable devices requirements. © 2015 Trans Tech Publications, Switzerland.

关键词： Low pass filters

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Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression

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Chinese Optics Letters 2017年第11期15卷 41-45页

作者：肖锡晟于清华朱振涛胡凯陈桂林 Shanghai Institute of Technical Physics of the Chinese Academy of Sciences Shanghai 200083 China Key Laboratory of Infrared System Detection and Imaging technology Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China

The use of a computer-generated hologram（CGH） in interferometric testing provides new methods for highly accurate optical *** fabricate a CGH,polygons are used to approximate the smooth CGH *** the data size supported by CGH writing machines is limited,the number of polygon vertices must be ***,the CGH-encoding method determines the encoding *** realize a highly accurate optical measurement using CGHs,we propose a CGH-pattern-encoding method based on non-maxima suppression.A self-aligned CGH is designed to verify the *** experimental result shows that a highly accurate CGH can be fabricated using this method.

关键词： maxima suppression encoding aligned polygon fabricate deviation fabrication verify approximate

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An improvement method of a lossless compression scheme for the datacube from Geostationary Interferometric infrared Sounder (GIIRS) and its FPGA implementation 9

An improvement method of a lossless compression scheme for t...

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9th IEEE Joint International Information technology and Artificial Intelligence Conference, ITAIC 2020

作者： Yang, Minzhu Hernandez, Raul Guerra Han, Changpei Feliciano, Jose Francisco Lopez China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering Hangzhou China Instituto Universitario de Microelectrónica Aplicada Universidad de Las Palmas de Gran Ganaria Las Palmas Spain Chinese Academy of Science Key Laboratory of Infrared System Detection and Imaging Technology Shanghai China

This paper briefly described an improved method for the original proposed scheme based on Vector Quantization and Linear Prediction to further enhance the compression ratio while reduce the time cost. Given the fact that the interferograms belong to the same datacube are similar to each other, there are two obvious modifications in this paper: predict only once to get the general predicted coefficients for the same datacube;along with treat datacube rather than sequence as the encoded unit. The time consumption spent by Linear Prediction part will shrink about 35.55% by predicting just once. Moreover, the change of the encoded object makes the final compression ratio get a further rise range from 2.62% to 3.711%. © 2020 IEEE.

关键词： Field programmable gate arrays (FPGA)

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A Novel Adaptive Graph Transformer For Point Cloud Object detection 7

A Novel Adaptive Graph Transformer For Point Cloud Object De...

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7th International Conference on Communication and Information Systems, ICCIS 2023

作者： Sun, Shaoyu Shi, Chunhao Wang, Chunyang Liu, Xuelian School of Electronic and Information Engineering Changchun University of Science and Technology Changchun China Xi'an Technological University Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an China

ISBN: (纸本)9798350330540

With the advancement of autonomous driving technology, Lidar-driven 3D object detection has become a focal point of research. However, many existing point-driven approaches face challenges due to rigid local dependencies and entangled foreground-background points. The direct utilization of point clouds for 3D object detection is also complicated by the inherent sparsity and irregularities of Lidar data. To counter these challenges, we propose AGT-SSD a single-stage graph-based 3D detector to improve object performance especially for small objects. Which comprises two critical modules adaptive graph feature convolution module (AGF) and a point cloud transformer layer with self-attention mechanism (TSA). AGF module utilizes an adaptive graph kernel to process graph features, facilitating feature interactions within the feature domain to help detect small objects. Non-local transformer layer incorporates self-attention module, designed to capture long-range dependencies to encode global sematic and spatial feature to improve detection performance. This enhancement is attributed to the geometric structure refinement through graph convolution methods and the use of a self-attention mechanism to grasp long-range dependencies. Both modules employ non-local operations, adapt at discerning long-range correlations. Extensive experiments on the KITTI dataset demonstrated that our detector is not flexible and plug and play for other detectors but also highlight the superior accuracy of our method compared to other state-of-the-art detectors. © 2023 IEEE.

关键词： Adaptive Graph Kernel Object detection Point Cloud Transformer

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Design and performance of a high-speed and low-noise preamplifier for SiPM

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Nuclear Science and Techniques 2023年第11期34卷 93-102页

作者： Xi‑Yang Wang Hong‑Yu Zhang De‑Qing Fang Wan‑Bing He Xiao‑Long Wang Qi‑Bin Zheng Shi‑Ming Zou Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China Laboratory of Radiation Detection and Medical Imaging and School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Considering the R&D for upgrading the K^(0)_(L) andμdetectors in the Belle II experiment using a scintillator and silicon pho-tomultiplier(SiPM),we designed a compact high-speed and low-noise *** preamplifier demonstrated a good gain stability,bandwidth of 426 MHz,baseline noise level ofσ≈0.6 mV,dynamic range of up to170 mV of the input signal amplitude,good time resolution of 20 ps,and it can be comprehensively applied to *** pole-zero-cancelation in the preamplifier reduces both the rise and fall times of the SiPM signal,which can significantly improve the time resolution and reduce the pile-up when using a large SiPM or an array of *** combinations of the preamplifier and several types of SiPMs demonstrated time resolutions better than 50 ps for most cases;when the number of detected photons was larger than 60,a time resolution of approximately 25 ps was achieved.

关键词： Silicon photomultiplier High-speed amplifier Low noise High time resolution

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A polarization image false color fusion method for target against dark background 8

A polarization image false color fusion method for target ag...

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8th Symposium on Novel Photoelectronic detection technology and Applications

作者： Wu, Lingxia Wu, Yunzhi Jia, Rong Huang, Qinchao Army Academy of Artillery and Air Defense of PLA Anhui Hefei230031 China Anhui Key Laboratory of Polarized Light Imaging Detection Technology Hefei230031 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

To overcome the draw back of traditional false color fusion methods for polarization images, a new false color fusion method is proposed in this ***, all of the polarization parameter images are obtained by polarization information *** the robustness of the obtained polarization information is estimated by the spatial distribution characteristics of the polarization angle. Finally, an alternate mapping for the strong polarization characteristic region (the target region) and the noise region (the background region) is *** experimental results show that the proposed method has good quality and is easy to be further segmented and identified. © 2022 SPIE

关键词： Image fusion

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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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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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