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2013 8th International Workshop on Systems, Signal Processing and their Applications (WoSSPA)最新文献

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Automatic identification of electrical appliances using smart plugs 使用智能插头自动识别电器
A. Ridi, Christophe Gisler, J. Hennebert
We report on the evaluation of signal processing and classification algorithms to automatically recognize electric appliances. The system is based on low-cost smart-plugs measuring periodically the electricity values and producing time series of measurements that are specific to the appliance consumptions. In a similar way as for biometric applications, such electric signatures can be used to identify the type of appliance in use. In this paper, we propose to use dynamic features based on time derivative and time second derivative features and we compare different classification algorithms including K-Nearest Neighbor and Gaussian Mixture Models. We use the recently recorded electric signature database ACS-Fl and its intersession protocol to evaluate our algorithm propositions. The best combination of features and classifiers shows 93.6% accuracy.
我们报告了对自动识别电器的信号处理和分类算法的评估。该系统基于低成本的智能插头,定期测量电值,并产生特定于电器消耗的时间序列测量值。与生物识别应用类似,这种电子签名可以用来识别使用中的器具的类型。在本文中,我们提出使用基于时间导数和时间二阶导数特征的动态特征,并比较了不同的分类算法,包括k -最近邻和高斯混合模型。我们使用最近记录的电子签名数据库ACS-Fl及其会话间协议来评估我们的算法命题。特征与分类器的最佳组合准确率为93.6%。
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引用次数: 47
An effective segmentation of moving objects by a novel local regions-based level set 一种新的基于局部区域的水平集对运动目标的有效分割
M. Boumehed, B. Alshaqaqi, A. Ouamri, M. Keche, Mohamed El Amine Ouis
This paper presents new local regions based level set model for segmenting multiple moving objects in video sequences captured by a stationary camera. The main idea evolves around the reformulation of well-known global energy in local way, by utilizing little squared windows centered on each point over a thin band surrounding the zero level set, hence the object contour can be reshaped into small local interior and exterior regions that lead to compute a family of adaptive local energies. Moreover, we propose to adapt the smoothness of the contours with an automatic stopping criterion. The proposed method has been tested on different real videos, and the experiment results demonstrate that our algorithm can segment effectively and accurately the moving objects.
本文提出了一种新的基于局部区域的水平集模型,用于分割静止摄像机拍摄的视频序列中的多个运动目标。其主要思想是围绕着众所周知的全局能量在局部的重新制定,通过在零水平集周围的薄带上利用以每个点为中心的小正方形窗口,从而将物体轮廓重塑为小的局部内部和外部区域,从而计算一系列自适应的局部能量。此外,我们还提出了一种自动停止准则来适应轮廓的平滑度。在不同的真实视频中对该方法进行了测试,实验结果表明,该算法可以有效、准确地分割运动目标。
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引用次数: 0
Relay self interference minimisation using tapped filter 继电器自干扰最小化使用抽头滤波器
S. Al-Jazzar, T. Al-Naffouri
In this paper we introduce a self interference (SI) estimation and minimisation technique for amplify and forward relays. Relays are used to help forward signals between a transmitter and a receiver. This helps increase the signal coverage and reduce the required transmitted signal power. One problem that faces relays communications is the leaked signal from the relay's output to its input. This will cause an SI problem where the new received signal at the relay's input will be added with the unwanted leaked signal from the relay's output. A Solution is proposed in this paper to estimate and minimise this SI which is based upon using a tapped filter at the destination. To get the optimum weights for this tapped filter, some channel parameters must be estimated first. This is performed blindly at the destination without the need of any training. This channel parameter estimation method is named the blind-self-interference-channel-estimation (BSICE) method. The next step in the proposed solution is to estimate the tapped filter's weights. This is performed by minimising the mean squared error (MSE) at the destination. This proposed method is named the MSE-Optimum Weight (MSE-OW) method. Simulation results are provided in this paper to verify the performance of BSICE and MSE-OW methods.
本文介绍了一种用于放大和正向继电器的自干扰估计和最小化技术。继电器用来帮助在发射机和接收机之间转发信号。这有助于增加信号覆盖范围并降低所需的传输信号功率。继电器通信面临的一个问题是从继电器的输出到其输入的泄漏信号。这将导致SI问题,其中继电器输入端的新接收信号将与继电器输出端的不需要的泄漏信号一起添加。本文提出了一种基于在目的地使用抽头滤波器来估计和最小化SI的解决方案。为了得到该抽头滤波器的最优权值,必须首先估计一些信道参数。这是在目的地盲目进行的,不需要任何培训。这种信道参数估计方法被称为盲自干扰信道估计(BSICE)方法。该解决方案的下一步是估计抽头滤波器的权重。这是通过最小化目的地的均方误差(MSE)来实现的。该方法被命名为mse -最优权值法(MSE-OW)。仿真结果验证了BSICE和MSE-OW方法的性能。
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引用次数: 2
BEMD-Unsharp Masking for retinal angiography image sharpening 用于视网膜血管造影图像锐化的bemd -非锐化掩蔽
B. Bouledjfane, L. Bennacer, M. Kahli
Image sharpening is the essential preprocessing step when improving the angiographies retinal image quality. It is helpful for the vessel retinal analysis and for improving the quality of their. For this reason, we propose a new technique for image sharpening based on Unsharp Masking (UM), and Bidimensional Empirical Mode Decomposition (BEMD). Firstly, the image is decomposed into a set of bidimensional intrinsic mode functions (BIMFs) and the residual image. Afterward, a weighting mask is achieved from an edge map multiplied by a compensation factor. Then, we apply the weighting mask to the first mode. Finally, we perform the reconstruction of the sharpened image by summing the compensated BIMF1 with the rest of the other modes and the residual image. The proposed scheme is enhanced by means of deringing's step to overcome the overshooting introduced during image sharpening. The obtained results proved that the proposed approach is effective to sharpen retinal images.
图像锐化是提高血管造影视网膜图像质量必不可少的预处理步骤。这有助于血管视网膜分析,提高血管视网膜分析的质量。为此,我们提出了一种基于非锐化掩蔽(UM)和二维经验模态分解(BEMD)的图像锐化新技术。首先将图像分解为一组二维本征模态函数(bimf)和残差图像;然后,从边缘映射乘以补偿因子获得加权掩码。然后,我们将权重蒙版应用于第一模式。最后,我们通过将补偿后的BIMF1与剩余的其他模式和残差图像相加来重建锐化后的图像。该方案通过dering的步骤来克服图像锐化过程中引入的过调。实验结果表明,该方法能有效地锐化视网膜图像。
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引用次数: 2
Mathematical models for machine learning and pattern recognition 机器学习和模式识别的数学模型
D. Bouchoffra, F. Ykhlef
In this tutorial, we provide an in depth analysis of some important issues within the field of Machine Learning and Pattern Recognition. We intend to reflect recent developments and provide a comprehensive introduction to some fundamental issues pertaining to the field of machine learning and pattern recognition. We target advanced undergraduates or first year Ph.D. students as well as researchers and practitioners. The mathematical models covered during this tutorial include Machine Learning for Pattern Recognition, Hidden Markov Models and feature space Dimensionality Reduction. MATLAB projects are provided as experiments to the theory covered.
在本教程中,我们对机器学习和模式识别领域的一些重要问题进行了深入分析。我们打算反映最近的发展,并提供有关机器学习和模式识别领域的一些基本问题的全面介绍。我们的目标是高级本科生或一年级博士生以及研究人员和从业人员。本教程中涉及的数学模型包括模式识别的机器学习、隐马尔可夫模型和特征空间降维。提供了MATLAB项目作为所涵盖理论的实验。
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引用次数: 2
Flexible OFDM system for peak power reduction in OFDM-based Cognitive Radio context 基于认知无线电环境下OFDM峰值功率降低的柔性OFDM系统
B. Koussa, S. Bachir, C. Perrine, C. Duvanaud, R. Vauzelle
Systems based on Orthogonal Frequency Division Multiplexing (OFDM) take advantages of multicarrier modulations. Properties in term of dynamic spectrum adjustment make OFDM a promising technology for Cognitive Radio systems. An OFDM modulation suffers from high power peaks, which significantly degrade the power efficiency and the linearity of the transmitter. In this paper, the Tone Reservation method is used to reduce the Peak-To-Average Power-Ratio (PAPR) in OFDM systems. We intend to consider an adaptive algorithm to improve speed convergence and PAPR reduction gain, taking into account the complexity of the algorithm. The proposed approach is based on the Conjugate-gradient method which is a powerful gradient descent algorithm, reliable and efficient on a wide range of optimization problems. The radio-frequency Power Amplifier (PA) being the most sensitive element to envelope fluctuations, a class AB 2.4 GHz-2 W InGaP PA is used to evaluate the performance of the proposed method in terms of Bit Error Rate and Error Vector Magnitude.
基于正交频分复用(OFDM)的系统充分利用了多载波调制的优势。OFDM的动态频谱调整特性使其成为认知无线电系统中一种很有前途的技术。OFDM调制受到高功率峰值的影响,这会显著降低发射机的功率效率和线性度。本文采用音调保留方法降低OFDM系统的峰均功率比(PAPR)。考虑到算法的复杂性,我们打算考虑一种自适应算法来提高速度收敛和PAPR降低增益。该方法基于共轭梯度法,它是一种强大的梯度下降算法,在广泛的优化问题上具有可靠和高效的特点。射频功率放大器(PA)是对包络波动最敏感的元件,使用AB类2.4 ghz - 2w InGaP PA从误码率和误差矢量幅度方面评估了所提方法的性能。
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引用次数: 2
Premature ventricular contraction arrhythmia detection using wavelet coefficients 利用小波系数检测室性早搏心律失常
M. Adnane, A. Belouchrani
Premature ventricular contraction (PVC) detection is an important task in critical care medicine. However, making this task automatic is not that simple. In this paper, we are describing a method for PVC arrhythmia detection. This method is based on the use of wavelet detail coefficients to discriminate between normal beats and abnormal beats (PVCs). The proposed method was tested against selected records of the MIT-BIH Arrhythmia Database (MITDB). Results are very satisfactory and show that it is possible to detect PVC arrhythmia using wavelet detail coefficients applied to QRS complexes.
室性早搏(PVC)的检测是危重医学的一项重要任务。然而,使这项任务自动化并不是那么简单。在本文中,我们描述了一种检测PVC心律失常的方法。该方法基于小波细节系数来区分正常心跳和异常心跳。采用MIT-BIH心律失常数据库(MITDB)的选定记录对所提出的方法进行了测试。结果令人满意,表明将小波细节系数应用于QRS复合体检测室性心律失常是可行的。
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引用次数: 9
Design of a multiblock general regression neural network for wind speed prediction in Algeria 阿尔及利亚风速预测的多块广义回归神经网络设计
F. Douak, N. Benoudjit, F. Melgani
In this work, we investigate a new design of a multiblock general regression neural network applied to wind speed prediction in Algeria. The idea in our proposed method is to minimize the error of the prediction for wind speed in such a way as to minimize the quantity of training samples used, and thus to reduce the costs related to the training sample collection. For this reason, we propose to select the most significant sample among a large number of training samples by using multiblock general regression neural network (MBGRNN). This paper presents experimental results on six different real wind speed measurement stations in Algeria namely, Alger, Djelfa, Bechar, Oran, Sétif and In Aménas. The wind speed data covers a period of ten years between 2001 and 2010.
在这项工作中,我们研究了一种应用于阿尔及利亚风速预测的多块通用回归神经网络的新设计。我们提出的方法的思想是通过最小化训练样本的数量来最小化风速预测的误差,从而减少与训练样本收集相关的成本。为此,我们提出使用多块广义回归神经网络(multiblock general regression neural network, MBGRNN)从大量训练样本中选择最显著的样本。本文介绍了阿尔及利亚Alger、Djelfa、Bechar、Oran、ssamtif和in amsamims六个不同实际风速测量站的实验结果。风速数据涵盖了从2001年到2010年的十年间。
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引用次数: 3
Bayesian inference with hierarchical prior models for inverse problems in imaging systems 成像系统反问题的层次先验贝叶斯推理
A. Mohammad-Djafari
Bayesian approach is nowadays commonly used for inverse problems. Simple prior laws (Gaussian, Generalized Gaussian, Gauss-Markov and more general Markovian priors) are common in modeling and in their use in Bayesian inference methods. But, we need still more appropriate prior models which can account for non station-narities in signals and for the presence of the contours and homogeneous regions in images. Recently, we proposed a family of hierarchical prior models, called Gauss-Markov-Potts, which seems to be more appropriate for many applications in Imaging systems such as X ray Computed Tomography (CT) or Microwave imaging in Non Destructive Testing (NDT). In this tutorial paper, first some backgrounds on the Bayesian inference and the tools for assignment of priors and doing efficiently the Bayesian computation is presented. Then, more specifically hiearachical models and particularly the Gauss-Markov-Potts family of prior models are presented. Finally, their real applications in image restoration, in different practical Computed Tomography (CT) or other imaging systems are presented.
贝叶斯方法是目前常用的求解反问题的方法。简单先验定律(高斯,广义高斯,高斯-马尔可夫和更一般的马尔可夫先验)在建模和贝叶斯推理方法中很常见。但是,我们仍然需要更合适的先验模型来解释信号中的非平稳性以及图像中轮廓和均匀区域的存在。最近,我们提出了一种称为高斯-马尔可夫-波茨的分层先验模型,它似乎更适合于成像系统中的许多应用,例如X射线计算机断层扫描(CT)或无损检测(NDT)中的微波成像。在本教程中,首先介绍了贝叶斯推理的一些背景,以及分配先验和有效地进行贝叶斯计算的工具。然后,给出了更具体的层次模型,特别是先验模型的高斯-马尔可夫-波茨族。最后,介绍了它们在图像恢复、不同的实际计算机断层扫描(CT)或其他成像系统中的实际应用。
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引用次数: 4
Time frequency signal analysis and processing toolbox update 6.2: An enhanced research platform with new advanced high-resolution TFDs 时频信号分析与处理工具箱更新6.2:一个具有新的先进高分辨率tfd的增强研究平台
B. Boashash, M. Ghafoor
This paper describes the advancements, updates and improvements made in the new Time Frequency Signal Analysis TFSAP toolbox as compared with the previous TFSA toolbox version. The updates and improvements done in TFSA toolbox are in-line with the latest research done in recent few years in the field of time-frequency based signal analysis. TFSA Toolbox has proved in the past to be an efficient and popular tool for analyzing non-stationary signals. The new TFSAP Toolbox is an updated Matlab toolbox that extends the functionality of previous TFSA toolboxes. It provides additional options for generating new time-frequency distributions, and synthesizing a signal from its time-frequency distribution. It also includes options for analyzing real-life signals such as biomedical, speech and radar signals. Several demo scripts are also included in the new version to demonstrate the main functionality of the toolbox and to coach new users to use TFSA toolbox for advanced signal processing applications dealing with non-stationarities. The new version is renamed TFSAP 6.2; it can be downloaded for free as a service to the community.
本文介绍了与以前的TFSA工具箱版本相比,新的时频信号分析TFSAP工具箱中的进步、更新和改进。TFSA工具箱的更新和改进符合近年来基于时频的信号分析领域的最新研究成果。TFSA工具箱在过去已被证明是一种分析非平稳信号的有效和流行的工具。新的TFSAP工具箱是一个更新的Matlab工具箱,扩展了以前的TFSA工具箱的功能。它为生成新的时频分布和从时频分布合成信号提供了额外的选项。它还包括分析生物医学、语音和雷达信号等现实信号的选项。新版本中还包含了几个演示脚本,以演示工具箱的主要功能,并指导新用户使用TFSA工具箱进行处理非平稳性的高级信号处理应用。新版本更名为TFSAP 6.2;它可以作为一项服务免费下载给社区。
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引用次数: 5
期刊
2013 8th International Workshop on Systems, Signal Processing and their Applications (WoSSPA)
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