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IEEE International Conference on Robotics and Biomimetics

作者： Zhun Fan Yibiao Rong Xinye Cai Wenji Li Huibiao Lin Zefeng Yu Jiewei Lu Key Laboratory of Digital Signal and Image Processing of Guangdong Provincial College of Engineering Shantou University. 515063 Shantou China College of Engineering Shantou University. 515063 Shantou China school of computer science and technology Nanjing University of Aeronautics and Astronautics Jiangsu China

ISBN: (纸本)9781467396769

Optic Disk (OD) detection plays an important role for fundus image analysis. In this paper, we propose an algorithm for detecting OD mainly based on a classifier model trained by structured learning. Then we use the model to achieve the edge map of OD. Thresholding is performed on the edge map to obtain a binary image. Finally, circle Hough transform is carried out to approximate the boundary of OD by a circle. The proposed algorithm has been evaluated on the public database and obtained promising results. The results (an area overlap and Dices coefficients of 0.8636 and 0.9196, respectively, an accuracy of 0.9770, and a true positive and false positive fraction of 0.9212 and 0.0106) show that the proposed method is a robust tool for the segmentation of OD and is very competitive with the stage-of-the-art methods.

关键词： algorithm detecting method

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Investigation of DCT/PCA combined with Kohonen classifier for human identification

Investigation of DCT/PCA combined with Kohonen classifier fo...

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International Conference on Electrical Engineering

作者： Fatma zohra CHELALI A. DJERADI N. CHERABIT Speech communication and signal processing laboratory LCPTS Faculty of Electronicas and Computing University of Science and Technology Houari Boumediene USTHB National School of Technology ENST

ISBN: (纸本)9781467366748

In this work, we use DCT transform and eigenfaces method to describe our facial dataset and to build a face recognition system using Kohonen self organizing map neural network classifier. Ascendant hierarchical classification is used to describe the efficiency of DCT transform. A Kohonen SOM neural network classifier is used to classify an individual from three face databases: The ORL, computer vision and Caltech databases. These data sets are used to illustrate the effect of variation of illumination, background and facial rotation. Our study demonstrates the efficiency of DCT without PCA reduction especially in controlled environment.

关键词： DCT SOM PCA Face recognition

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Zernike moments and histogram of oriented gradient descriptors for face recognition from video sequence 2

Zernike moments and histogram of oriented gradient descripto...

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2nd World Conference on Complex Systems, WCCS 2014

作者： Chelali, Fatma Zohra Djeradi, Amar Speech communication and signal processing Laboratory Faculty of electronics and computer science University of science and technology Houari Boumedienne USTHB Box No 32 Algiers16111 Algeria

ISBN: (纸本)9781479946471

The aim of our work is to investigate the use of two powerful feature descriptor known as Zernike moments and histogram of oriented gradient (HOG) for facial images extracted from a video sequence uttered ten times by four speakers where MLP neural network classifier is used to identify the correct speaker. We've demonstrated good recognition rate obtained for both Zernike moments and HOG descriptors. © 2014 IEEE.

关键词： Face recognition

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Secure transmission in multi-antenna hybrid satellite-terrestrial relay networks in the presence of eavesdropper

Secure transmission in multi-antenna hybrid satellite-terres...

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International Conference on Wireless Communications and signal processing (WCSP)

作者： Kang An Min Lin Tao Liang Jian Ouyang Can Yuan Yinbin Li College of Communications Engineering PLA University of Science and Technology Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Nanjing Telecommunication Technology Institute Nanjing China Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing China Unit 95982 of PLA Kaifeng China

ISBN: (纸本)9781467376884

This paper investigates the secrecy capacity of a multi-antenna amplify-and-forward (AF) hybrid satellite-terrestrial relay netwrok (HSTRN), which consists of a satellite, a relay, a terrestrial destination and a terrestrial eavesdropper. Specifically, by employing a two-stage beamforming (BF) scheme, where the relay first adopts the maximal ratio combining (MRC) to receive the signal from satellite and then performs zero-forcing (ZF) to completely null the eavesdropper's signal, the achievable secrecy capacity of the considered hybrid network is derived in closed-from. Eventually, simulation results are provided to demonstrate the superiority of the proposed BF scheme as well as the validity of the theoretical results, and show the effect of various channel parameters on the system performance.

关键词： Relays Satellites Satellite broadcasting Security System performance signal to noise ratio Array signal processing

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An Improved Algorithm Based On Reference Selection for Time Difference of Arrival Location

An Improved Algorithm Based On Reference Selection for Time ...

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International Congress on Image and signal processing

作者： Qiang Xu Yang Lei Jingmin Cao Hewen Wei Science and Technology On Blind Signal Processing Laboratory

ISBN: (纸本)9781479958368

Least Square (LS) estimation is a simple but not good enough for localization method which is widely used for target position estimation. The time difference of arrival (TDOA) location based on LS method needs to select a reference sensor to obtain a series of equations. Thus, the measured error of the selected first sensor will certainly influence the location accuracy. In our article, an algorithm based on select the primary sensor is proposed, which selects the primary station according the residual. New algorithm improves performs better than conventional method in harsh environment. Simulation shows that the location precise of new algorithm is much better than the other NLOS mitigation methods.

关键词： Reference selection LLS TDOA

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A Bandwidth Broadened Pattern-Reconfigurable Antenna Based on Graphene

A Bandwidth Broadened Pattern-Reconfigurable Antenna Based o...

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IEEE International Conference on Communication Problem-Solving

作者： R. Yuan Y. N. Jiang S. M. Li W. P. Cao X. Gao X. H. Yu Y. Wang Guangxi Key Laboratory of Wireless Wideband Communication & Signal Processing Guilin University of Electronic Technology School of Electrical and Information Engineering Guangxi University of Science and Technology

ISBN: (纸本)9781467365451

Based on graphene, this paper proposes a configuration of a bandwidth broadened pattern-reconfigurable antenna. The antenna is a monopole surrounded by a cylindrical graphene-based impedance surface coating, and the radiation pattern is dynamically controlled via graphene's field effect by applying adequate bias voltages. This antenna can work in the directional mode over the entire azimuth plane or omnidirectional mode;correspondingly, its relative bandwidth can reach 67% and 50% respectively by the coupling of graphene-based impedance surface coating.

关键词： Graphene Pattern-reconfigurable antenna Impedance surface

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Design of Ultra-Wideband Dual Polarization Bowtie Antenna Arrays with Backed Cavity

Design of Ultra-Wideband Dual Polarization Bowtie Antenna Ar...

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IEEE International Conference on Communication Problem-Solving

作者： Zhao Yang Wei ping Cao Si min Li Yannan Jiang Xinhua Yu Guangxi Key Laboratory of Wireless Wideband Communication & Signal Processing Guilin University of Electronic Technology School of Electrical and Information Engineering Guangxi University of Science and Technology

ISBN: (纸本)9781467365451

The design and results of Ultra-wideband dual polarization bowtie antenna arrays with backed cavity is presented in this paper. A single-pole of the Array element is composed of ellipse mixed structure with triangle. Placing two cross dipole, the whole unit can realize the function of dual polarization. Adding a reflector and a director can increase bandwidth, the gain, also can improve high-frequency pattern. Antenna array consists of 12 elements. Elements layout according to the rectangular grid and the advantage of this structure is simple, easy to adjustment and also can realize the function of multiple-input multiple-output. The design of ultra-wideband dual polarization bowtie antenna arrays with backed cavity can achieve the function of dual-polarization, wide bandwidth, high gain, light weight, low cost and low profile.

关键词： dual polarization bow-tie antennas Ultra wideband technologies LOW-PROFILE reflectors cavity

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Congestion control strategy based on probability selection in delay tolerant mobile sensor network

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Journal of Information and Computational science 2014年第14期11卷 5121-5130页

作者： Wang, Bingting Hu, Yanjun Liang, Hui Lin, Qibin Shi, Yonghua Wang, Xianbing School of Electronic and Electrical Engineering Chuzhou University Chuzhou China Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei China School of Information Science & Technology Southwest Jiaotong University Chengdu China

We analyzed the relationship between packet validity and encounter probability as well as the relationship between packet validity and remaining lifetime. Then we proposed the congestion control strategy based on probability selection, which implements the operations of congestion detection and congestion avoidance. When node buffer is fully occupied and needs to store a new packet, it will look for the packets whose remaining lifetime is lower than the threshold T, and then drop the packet with minimum encounter probability. If there is no packet whose remaining lifetime is lower than T, the packet with the shortest remaining lifetime will be dropped. Simulation results show that this congestion control strategy improves the performances of delivery probability, average delay and overhead ratio compared with four kinds of congestion control strategies. 1548-7741/Copyright © 2014 Binary Information Press

关键词： Probability

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A new type of IGBT device with electronic enhance collector

A new type of IGBT device with electronic enhance collector

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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Lai, Yu Shu Xiong, Yan Zhong, Shen Grong Xiong, Jian Key Laboratory of Signal and Information Processing Chongqing Three Gorges University Chongqing China School of Control Science and Engineering Dalian University of Technology Dalian China

ISBN: (纸本)9783038352464

A new type of substrate structure Electronic Enhance Collector IGBT (EEC-IGBT) was proposed, and the working principle was introduced in this paper. Compared with conventional IGBT, the substrate of EEC-IGBT was divided by the groove structure composed of oxide and aluminum. Finally, simulation analysis about the EEC-IGBT performance influence by structural parameters was given. The simulation results showed that the turn-off loss of EEC-IGBT was reduced 30% compared with CS-IGBT in the same condition voltage. © (2014) Trans Tech Publications, Switzerland.

关键词： Insulated gate bipolar transistors (IGBT)

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INTERSPEECH 2014 special session: Phase importance in speech processing applications 15

INTERSPEECH 2014 special session: Phase importance in speech...

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15th Annual Conference of the International Speech Communication Association: Celebrating the Diversity of Spoken Languages, INTERSPEECH 2014

作者： Mowlaee, Pejman Saeidi, Rahim Stylianou, Yannis Signal Processing and Speech Communication Laboratory Graz University of Technology Austria Speech and Image Processing Unit School of Computing University of Eastern Finland Finland Computer Science Dept. University of Crete Greece

many speech processing applications, the spectral amplitude is the dominant information while the use of phase spectrum is not so widely spread. In this paper, we present an overview on why speech phase spectrum has been neglected in the conventional techniques used in different applications including: Speech separation/enhancement, automatic speech and speaker recognition and speech synthesis. We proceed with giving highlights on the recent progress carried out in demonstrating the importance of phase in different applications and how it impacts on the overall performance. The paper is an introduction to the Interspeech 2014 special session phase importance in speech processing applications. Copyright © 2014 ISCA.

关键词： Speech synthesis

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