检索结果-内蒙古大学图书馆

An Experimental Evaluation of Foreground detection algorithms in Real Scenes

EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2010年第1期2010卷 1-11页

作者： Conte, Donatello Foggia, Pasquale Percannella, Gennaro Tufano, Francesco Vento, Mario Univ Salerno Dipartimento Ingn Informaz Ingn Elettr I-84084 Fisciano Italy

Foreground detection is an important preliminary step of many video analysis systems. Many algorithms have been proposed in the last years, but there is not yet a consensus on which approach is the most effective, not even limiting the problem to a single category of videos. This paper aims at constituting a first step towards a reliable assessment of the most commonly used approaches. In particular, four notable algorithms that perform foreground detection have been evaluated using quantitative measures to assess their relative merits and demerits. The evaluation has been carried out using a large, publicly available dataset composed by videos representing different realistic applicative scenarios. The obtained performance is presented and discussed, highlighting the conditions under which algorithm can represent the most effective solution.

关键词： Videotapes algorithms Real number detection algorithms Analysis systems

来源：评论

学校读者我要写书评

暂无评论

Coordinate Descent detection algorithms Using Adaptive Moment Estimation for MDL-Impaired Mode Division Multiplexing Systems

引用

IEEE ACCESS 2024年 12卷 170027-170040页

作者： Mi, Shuchao Zhang, Jianyong Yan, Baorui Shen, Yifan Wang, Muguang Fan, Guofang Zhang, Peiying Beijing Jiaotong Univ Key Lab All Opt Network & Adv Telecommun EMC Beijing 100044 Peoples R China Beijing Jiaotong Univ Inst Lightwave Technol Beijing 100044 Peoples R China China Univ Petr East China Qingdao Inst Software Coll Comp Sci & Technol Qingdao 266580 Peoples R China

The performance of mode division multiplexing (MDM) systems is limited by mode-dependent loss (MDL), which seriously deteriorates the unitarity of the transmission matrix, making the traditional detection algorithms ineffective. In order to mitigate the effect of MDL in MDM transmission and improve the efficiency of digital signal processing at the receiver, a novel coordinate descent (CD)-based box-constrained detection algorithm using adaptive moment estimate (CDbox-Adam) is proposed. In the process of each coordinate update for the CDbox detection algorithm, the adaptive moment estimation (Adam) method adaptively updates the step size for different parameters from the first moment estimate and the second moment estimate of the gradients. To simplify the process of each coordinate updating of the CDbox-Adam algorithm, the CDbox-Adamax detection algorithm is also proposed. The CDbox-Adamax detection algorithm generalizes the 2-norm update rule of weights to the infinite norm. At the same time, an early stop criterion is proposed to efficiently avoid unnecessary iterations. Simulation results show that the early stop criterion reduces the number of iterations of the proposed detection algorithms. For a 12-mode MDM system impaired by MDL, the average number of iterations of the proposed detection algorithms is less than the CDbox detection algorithm. Thus, the proposed detection algorithms present lower computational complexity than the CDbox detection algorithm. Furthermore, compared with the conventional minimum mean square error (MMSE) detection algorithm, the proposed detection algorithms, CDbox-Adam and CDbox-Adamax, gain signal to noise ratio (SNR) improvement of 2.3 dB and 1.6 dB at BER = 10(-5) when MDL = 5 dB with QPSK and 16QAM, respectively. In the presence of MDL = 5 dB and 10 dB, when compared with the proposed detection algorithms with perfect CSI, the proposed detection algorithms with LS channel estimation requires 5.1 dB and 2.5 dB more of SNR to get

关键词： Multiplexing Simulation Channel estimation Estimation Signal processing algorithms Receivers Propagation losses detection algorithms Computational complexity Signal to noise ratio Mode division multiplexing MDL detection algorithm channel estimation BER

来源：评论

学校读者我要写书评

暂无评论

Desgin and comparative study of some sequential jump detection algorithms for digital signals

引用

IEEE Transactions on Acoustics, Speech, and Signal Processing 1983年第3期31卷 521-535页

作者： M. Basseville A. Benveniste IRISA Rennes France

The purpose of this paper is to analyze the behavior of several jump detection algorithms when applied to the same real data (geophysical signals) and to compare these algorithms from different points of view: complexity, efficiency, robustness, and ability to characterize the detected jumps. Three types of algorithms are investigated: "filtered derivatives" detectors, cumulative sum (cusum) tests, and Willsky's generalized likelihood ratio (GLR) algorithm. A modified version of this last test is elaborated, and a new detector, mixing GLR and cusum tests, is presented.

关键词： detection algorithms Signal processing Robustness Testing Signal analysis Algorithm design and analysis Detectors Speech processing Geology Geologic measurements

来源：评论

学校读者我要写书评

暂无评论

AIDDS: A System for Developing and Testing Incident detection algorithms

引用

IFAC Proceedings Volumes 1997年第8期30卷 119-124页

作者： John Hourdakis Research Fellow University of Minnesota

Incident management is a major problem in traffic control. Traffic incidents are the cause for more than half of all traffic delays. The research undertaken by the University of Minnesota has reached a point where good knowledge on different incident detection techniques has been achieved. The computer program presented in this paper is designed to assist researchers in testing incident detection algorithms. The primary gains by using this program are the reduction of time needed for algorithm testing and the flexibility on designing the test site. With this program the user can assign individual threshold sets in every section, and use multiple algorithms simultaneously. The algorithms included in the version presented in this paper are DELOS(3,3), CALIFORNIA, Alg. #7, and Alg. #8. Some of the features that make this program unique are its ability to combine measurements on the field to create “pseudo” detectors, its capability to automatically judge if a detection is valid, and its ability to combine incident detection algorithms to improve detection performance.

关键词： detection algorithms Traffic control Computer aided testing Filtering techniques Pattern recognition

来源：评论

学校读者我要写书评

暂无评论

Low-complexity detection algorithms Based on Matrix Partition for Massive MIMO 9

Low-complexity Detection Algorithms Based on Matrix Partitio...

引用

9th International Conference on Wireless Communication and Signal Processing (WCSP)

作者： Wu, Haijian Lin, Jun Zhang, Chuan Wang, Zhongfeng Nanjing Univ Sch Elect Sci & Engn Nanjing Jiangsu Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781538620625

Massive Multiple-Input Multiple-Output (MIMO) is one of the key technologies in the fifth generation (5G) wireless communication for much higher throughput. However, current detection algorithms for massive MIMO suffer from large computational complexity. The Neumann series based approximated matrix inverse is a good tradeoff between detection performance and computational complexity. In this paper, compared to the traditional Neumann series based method, a matrix partition (MP) method is proposed to significantly reduce the number of required multiplications and additions while maintain comparable or even better detection performance. The presented MP method innovates the construction of pre-conditioner matrix and employs the Neumann series method in an intelligent way. Simulation results from a 128 x 16 massive MIMO system with 16-QAM modulation demonstrate that the proposed MP method can reduce the number of multiplications and additions by 68% and 70%, respectively.

关键词： MIMO Computational complexity Uplink Symmetric matrices Signal detection detection algorithms

来源：评论

学校读者我要写书评

暂无评论

A performance measure of boundary detection algorithms

A performance measure of boundary detection algorithms

引用

International Conference on Pattern Recognition

作者： P.L. Palmer H.S. Dabis J. Kittler Department of Electronics and Electrical Engineering University of Surrey Guildford UK

In this paper we derive a quality measure for analysing the performance of algorithms which seek to find boundaries and boundary models between regions of differing mean grey-level value. The measure can be used to compare different approaches and, more importantly, it can also be used as a first step to building self-optimising vision systems that can automatically optimise important parameters at each level of the system.

关键词： detection algorithms Machine vision Image edge detection System testing Image segmentation Electric variables measurement Performance analysis Algorithm design and analysis Area measurement Kernel

来源：评论

学校读者我要写书评

暂无评论

Content based file type detection algorithms

Content based file type detection algorithms

引用

Annual Hawaii International Conference on System Sciences (HICSS)

作者： M. McDaniel M.H. Heydari Computer Science Department James Madison University Harrisonburg VA USA

Identifying the true type of a computer file can be a difficult problem. Previous methods of file type recognition include fixed file extensions, fixed "magic numbers" stored with the files, and proprietary descriptive file wrappers. All of these methods have significant limitations. This paper proposes algorithms for automatically generating "fingerprints" of file types based on a set of known input files, then using the fingerprints to recognize the true type of unknown files based on their content, rather than metadata associated with them. Recognition is performed by three different algorithms based on: byte frequency analysis, byte frequency cross-correlation analysis, and file header/trailer analysis. Tests were run to measure the accuracy of these algorithms. The accuracy varied from 23% to 96% depending upon which algorithm was used. These algorithms could be used by virus scanning packages, firewalls, intrusion detection systems, forensic analyses of computer hard drives, Web browsers, or any other program that needs to identify the types of files for proper operation. File type detection is also important to the operating systems for correct identification and handling of files regardless of file extension.

关键词： detection algorithms Algorithm design and analysis Fingerprint recognition Performance analysis Frequency Testing Packaging Intrusion detection Forensics Drives

来源：评论

学校读者我要写书评

暂无评论

Demonstration of Sequence detection algorithms for Dynamic Spectrum Access Networks

Demonstration of Sequence Detection Algorithms for Dynamic S...

引用

IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN

作者： Zhanwei Sun Glenn J. Bradford J. Nicholas Laneman Department of Electrical Engineering University of Notre Dame Notre Dame IN USA

Spectrum sensing is a critical requirement for proposed Dynamic Spectrum Access networks both to avoid causing interference to primary users and to maximize the throughput of the secondary network. Traditional sensing algorithms are performance limited by the length of time they can observe the primary user's transmission. We implement for demonstrative purposes a number of sequence detection spectrum sensing algorithms that take into account the transitions in the primary user's channel access, resulting in better sensing performance. The demonstration consists of primary and secondary data links that are both streaming video in the same frequency band, forcing the secondary link to opportunistically access the spectrum. Various sensing algorithms are selectable and configurable at the secondary transmitter, including multiple sequence detection algorithms and energy detection. The superior performance of the sequence detection algorithms is evident at the receivers through a number of metrics, including video quality, plots of the historical data rate, and estimates of the detection and false alarm probabilities.

关键词： detection algorithms Radio transmitters Baseband Interference Streaming media Receivers Radio frequency Degradation Communications Society Sun

来源：评论

学校读者我要写书评

暂无评论

Research on the detection algorithms for the V-BLAST System

Research on the Detection Algorithms for the V-BLAST System

引用

International Conference on Internet Technology and Applications (iTAP)

作者： Xiao-Hua Ma Zi-Wei Zheng Ting-ting Cao College of Information Science and Engineering Ningbo University Ningbo China

Layered space-time code technique is a good scheme to improve the wireless transmission rate and reliability. The paper discusses four detection algorithms for the Vertical-Bell Laboratories Layered Space-Time (V-BLAST) system. Then, it analyzes the process of algorithms in detail and simulates them. The bit error rate (BER) for the four detection algorithms in different channel situations are compared.

关键词： detection algorithms Binary phase shift keying Bit error rate Antennas Space time codes Wireless communication

来源：评论

学校读者我要写书评

暂无评论

Investigating the Performance of Corridor and Door detection algorithms in Different Environments

Investigating the Performance of Corridor and Door Detection...

引用

International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Wenxia Shi Jagath Samarabandu Department of Electrical and Computer Engineering University of Western Ontario London ONT Canada

The capability of identifying physical structures in an unknown environment is important for autonomous mobile robot navigation and scene understanding. A methodology for detecting corridor and door structures in an indoor environment is proposed, and the performances of the corridor detection algorithm and door detection algorithm applied in different environments are evaluated. In the proposed algorithms, we utilize a feedback mechanism based hypothesis generation and verification (HGV) method to detect corridor and door structures using low level line features in video images. The proposed method consists of low, intermediate, and high level processing stages which correspond to the extraction of low-level features, the formation of hypotheses, and the verification of hypotheses using a feedback mechanism, respectively. The system has been tested on a large number of real corridor images captured by a moving robot in a corridor. The experimental results validated the effectiveness and robustness of the proposed methods with respect to different viewpoints, different robot moving speed, under different illumination conditions and reflection variations.

关键词： detection algorithms Feedback Mobile robots Navigation Layout Indoor environments Performance evaluation Feature extraction System testing Robustness

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：