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Exploiting Local and Global Characteristics for Contrast Based Visual Saliency Detection

Journal of Shanghai Jiaotong university(Science) 2015年第1期20卷 14-20页

作者：徐新王英林张晓龙 School of Computer Science and Technology Wuhan University of Science and Technology Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan University of Science and Technology School of Information Management and Engineering Shanghai University of Finance and Economics

Visual saliency is an important cue in human visual system to identify salient region in the image;it can be useful in many applications including image retrieval,object recognition,image segmentation,*** contrast has been used as an effective feature to detect visual salient ***,the conventional contrast measures either in spectral domain or in spatial domain fail to give sufficient consideration towards the local and global characteristics of the *** paper presents a visual saliency detection algorithm based on a novel contrast *** measurement extracts the spectral information of image block using the 2D discrete Fourier transform(DFT),and combines with the total variation(TV)of image block in spatial *** proposed algorithm is used to perform salient region detection in the image,and compared with state-of-the-art *** experimental results from the MSRA dataset validate the effectiveness of the proposed algorithm.

关键词： visual saliency contrast measure multi-scale local contrast global contrast

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A MPPT algorithm based on membrane system for photovoltaic systems under partially shaded conditions

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Journal of Computational and Theoretical Nanoscience 2016年第6期13卷 3878-3886页

作者： He, Juanjuan Fu, Jiao Liu, Jun Xiao, Jianhua School of Computer Science Wuhan University of Science and Technology Wuhan430081 China Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Wuhan430081 China Department of Computer Science Xiamen University Xiamen Fujian361005 China

The algorithm based on membrane system, also called membrane-inspired algorithm, has been shown to be powerful for solving combinatorial optimization problems, and it is increasingly used in practical engineering. With integrating membrane structures, evolution rules and computational mechanisms of membrane systems, membrane-inspired algorithms perform well in searching the global optimum. However, this technique can be computationally expensive because of complicated rules and communication mechanism, so that most of membrane-inspired algorithms solved problems off-line. In this work, we propose a novel membrane-inspired algorithm for tracking the global point (GP) online. The ring structure with memory mechanism is adopted to maintain diversity and the convergence that is speeded up by the fast making rules. We verify our method by solving four benchmark functions, and a numerical example of tracking the GP of photovoltaic (PV) system. The experimental results show that our methodology performs well on these four benchmark functions compared with the genetic algorithm and quantum-inspired algorithm. In practice, our method quickly tracks the GP of a PV system. Copyright © 2016 American Scientific Publishers. All rights reserved.

关键词： Membranes

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Interface conversion and extension based on FPGA in high-speed real-time signal processing system

Interface conversion and extension based on FPGA in high-spe...

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IET International Radar Conference 2015

作者： Sun, Hao Chen, Fang Hu, Shanqing Li, Xingming Sun, Yujie State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology China Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology China Robfly Research Center Electromechanical College Beijing Institute of Technology China

ISBN: (纸本)9781849199940

The radar systems have been so significant for both civil use and national defense, and adopting localized processor has become critical for a country, especially for the area related to the national defense. In this paper, we utilize localized BWDSP100 as the main processor, and implement a high-speed and real-time signal processing system by using BWDSP100 + FPGA framework. We use FPGA to realize the interface conversions and extensions, which enhance the reading bandwidth of the DDR2 interface from 235MB/s to 562MB/s. Besides that, we also integrate highspeed serial buses, such as PCIe interface of 243MB/s and SRIO interface of 344MB/s, for communications in or between boards. The system has been used in several projects, and works well.

关键词： Field programmable gate arrays (FPGA)

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TOA estimation for unkonwn signal under low SNR condition based on accumulation

TOA estimation for unkonwn signal under low SNR condition ba...

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IET International Radar Conference 2015

作者： J. C. Xu L. X. Ren Z. Y. Jiang E. K. Mao Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing

ISBN: (纸本)9781510822023

This paper presents a novel low complexity TOA estimation method for unknown signal under low SNR condition, especially for inner-pulse modulated signal. In this new method, received signal is firstly pre-processed by multiplying its delayed conjugation to reduce intra-pulse modulation. Then a refined coherent accumulation is applied to achieve a precise TOA estimation result. Simulation results show that this new method can achieve an accurate TOA estimation for unknown signal under low SNR condition.

关键词： TOA estimation coherent accumulation multiplication with delayed conjugation

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A modified SPECAN algorithm based on Chirp Scaling principle

A modified SPECAN algorithm based on Chirp Scaling principle

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IET International Radar Conference 2015

作者： Zhou, Zhichao Yang, Wenfu Feng, Dongbo Ding, Zegang Zeng, Tao Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing100081 China China Academy of Launch Vehicle Technology Beijing100076 China

ISBN: (纸本)9781849199940

When synthetic aperture radar (SAR) works at the squint mode with a large grazing angle, the range walk varies obviously with the slant range. The traditional SPECAN algorithm corrects the range walk only based on the central slant range. Thus there are residual range walks at range edges of the swath, which finally leads to the defocus of the image. In order to solve this problem, a modified SPECAN algorithm based on the Chirp Scaling principle is proposed in this paper. First, the received data is multiplied by Chirp Scaling factor in the two-dimension time domain to eliminate the range variation of the range walk. Then the traditional SPECAN algorithm is applied to accomplish the two-dimension focus of the image. Simulation results confirm the validity of the proposed algorithm.

关键词： Synthetic aperture radar

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Semantic Representation of Evidence-Based Medical Guidelines and Its Use Cases

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Wuhan University Journal of Natural Sciences 2015年第5期20卷 397-404页

作者： HU Qing HUANG Zhisheng GU Jinguang College of Computer Science and Technology Wuhan University of Science and Technology Hubei Province Key Laboratory of Intelligent Information Processing and Real-Time Industrial System Department of Computer Science Vrije University Amsterdam

Semantic representation of evidence-based medical guidelines provides the support for the data inter-operability and has been found many applications in the medical domain. In this paper, we describe a semantic representation approach of evidence-based medical guidelines, which is based on the Semantic Web technology standards. We discuss several use cases of that semantic representation of evidence-based medical guideline, and show that they are potentially useful for medical applications.

关键词： evidence-based medical guidelines semantic repre- sentation semantic technology use cases

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An improved dem reconstruction method based on shortest sub-interval in MF-InSAR

An improved dem reconstruction method based on shortest sub-...

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IET International Radar Conference 2015

作者： Liu, Tiandong Ge, Shiqi Ding, Zegang Zhang, Qi Long, Teng Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Radar Research Lab. School of Information and Electronics Beijing Institute of Technology Beijing100081 China Nanjing Research Institute of Electronics Technology Nanjing210039 China

ISBN: (纸本)9781849199940

Interferometric synthetic aperture radar (InSAR) can realize the elevation extraction of the target. Through increasing the degree of freedom (DOF) during the topography calculation, multi-frequency InSAR technology can further achieve high-accuracy elevation reconstruction in steep terrain. Although the maximum likelihood estimation (MLE) method is widely used in the signal processing of multi-frequency InSAR, its performance can be influenced by phase noise. This paper proposes a creative algorithm which combines the maximum likelihood elevation estimation with the shortest sub-interval seeking operator (SSIS-MLE). It statistically averages the elevation estimation results of the MLE with class histogram, so that efficiently excludes the error estimation. Simulation results verify that this method not only maintains the high calculation efficiency of traditional MLE method, but also guarantees the high accuracy of elevation estimation.

关键词： Maximum likelihood estimation

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The squinted-looking SAR real-time imaging based on multi-core DSP

The squinted-looking SAR real-time imaging based on multi-co...

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IET International Radar Conference 2015

作者： Li, Congxin Jie, Long Cui, Lei Yao, Di Department of Electronic Engineering Beijing Institute of Technology Beijing100081 China Science and Technology on Information System Engineering Laboratory Beijing100038 China Beijing Key Laboratory of Embedded Real-Time Information Processing Beijing100081 China Key Laboratory of Electronic and Information Technology in Satellite Navigation Beijing100081 China

ISBN: (纸本)9781849199940

This paper presents a use of multi-core DSP TMS320C6678 for the squinted-looking synthetic aperture radars (SARs) real-time signal processing method. This paper first briefly introduces the squinted-looking SAR algorithm and analyzes the signal processing by use of spectral analysis (SPECAN). Then, according to the requirement of squinted-looking SAR real-time imaging system, the high performance TI multi-core DSP TMS320C6678 is used for realizing the imaging algorithm through the virtual single-node technology for data transmission and interaction and the parallel approach to data processing. Finally, the flight experiment is carried out and the results show that the virtual processing method meets the requirements of the real-time imaging based on the multi-core DSP hardware platform effectively.

关键词： Synthetic aperture radar

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Design of a configurable fixed-point FFT processor

Design of a configurable fixed-point FFT processor

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IET International Radar Conference 2015

作者： Yang, Chen Xie, Yi-Zhuang Chen, Liang Chen, He Deng, Yi Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Beijing China Department of Electrical and Computer Engineering Virginia Polytechnic Institute State University ArlingtonVA United States

ISBN: (纸本)9781849199940

In this paper, we focus on the widely-used radix-22 Decimation-In-Frequency (DIF) Fast Fourier Transform (FFT) algorithm. A variable-length, controllable-precision FFT processor is proposed. The processor can perform 16, 64, 256 and 1024 point FFT/IFFT and provide flexible wordlength scaling modes for different FFT stages. Thus, the processor is suitable for different precision and FFT length requirements in various applications. Aiming at high throughput performance, single-path delay feedback (SDF) pipeline architecture is adopted. The design is testified on Xilinx Virtex6 xc6vcx240t FPGA. Accordingly, we make a clear comparison between the proposed design and Xilinx FFT v7.1. Our design achieves better signal-to-quantizationnoise ratio (SQNR) property and shorter pipeline latency. Meanwhile, the occupied resource is approximately the same. Moreover, SQNR performance of different FFT length and wordlength scaling modes is analysed.

关键词： Field programmable gate arrays (FPGA)

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Research on BP imaging algorithm parallelization using C6678 DSPs

Research on BP imaging algorithm parallelization using C6678...

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IET International Radar Conference 2015

作者： Zhao, Jiayun Yuan, Yuan Wang, Jinghua Jin, Ye Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing China North China Institute of Computing Technology Beijing China Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

ISBN: (纸本)9781849199940

Compared to the traditional SAR imaging algorithm, Back Projection(BP) algorithm is an accurate point-by-point imaging radar algorithm based on time-domain, with simple principle and without any approximation error in the imaging process. However, because of intensive computation and low efficiency, it's a new challengetostorage to capacity, throughput and processing ability of DSPs, a single DSP is not enough to meet these demands. So a parallel implementation method of BP algorithm based on TMS320C6678 DSP is proposed in this *** put forward a large point FFT multi-core parallel processing method on 2/4/8 cores what is frequently used in BP algorithm, and a multi-core synchronization method based on distributed memory. Finally using the measured data, we verify the parallel method can greatly enhance the multi-core parallelism, and the real-time performance of BP algorithm has been significantly improved.

关键词： Fast Fourier transforms

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