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2012 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA)最新文献

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A unified approach for the estimation of instantaneous frequency and its derivatives for non-stationary signals analysis 非平稳信号分析中瞬时频率及其导数估计的统一方法
I. Orović, A. Draganic, S. Stankovic, E. Sejdić
A unified approach for the estimation of the first three phase derivatives of non-stationary signals is proposed in this paper. The possibility to accurately estimate phase derivatives is important in many applications dealing with objects velocity, acceleration and acceleration rate, such as the radar applications and mechanics. The estimation approach is based on definition of the complex-lag distribution. The proposed distribution is inspired by the concepts of complex analysis theory. The general form of distribution for the estimation of the first, second and third derivative of the phase is derived from the specific individual cases. The theoretical considerations are illustrated in the example with fast varying signal phase function.
本文提出了一种估计非平稳信号前三相导数的统一方法。准确估计相位导数的可能性在许多处理物体速度、加速度和加速度率的应用中是重要的,例如雷达应用和力学。该估计方法基于复滞后分布的定义。所提出的分布受到复分析理论概念的启发。相位一阶导数、二阶导数和三阶导数估计的一般分布形式是由具体的个别情况推导出来的。以快速变化的信号相位函数为例说明了理论考虑。
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引用次数: 5
A new framework based on signature patches, micro registration, and sparse representation for optical text recognition 基于签名补丁、微配准和稀疏表示的光学文本识别新框架
R. F. Moghaddam, F. F. Moghaddam, M. Cheriet
A framework for development of segmentation-free optical recognizers of ancient manuscripts, which work free from line, word, and character segmentation, is proposed. The framework introduces a new representation of visual text using the concept of signature patches. These patches which are free from traditional guidelines of text, such as the baseline, are registered to each other using a microscale registration method based on the estimation of the active regions using a multilevel classifier, the directional map. Then, an one-dimensional feature vector is extracted from the registered signature patches, named spiral features. The incremental learning process is performed using a sparse representation using a dictionary of spiral feature atoms. The framework is applied to the George Washington database with promising results.
提出了一种不需要行、字、字分割的古代手抄本无分割光学识别器的开发框架。该框架使用签名补丁的概念引入了一种新的视觉文本表示。这些不受传统文本指南(如基线)约束的补丁,使用基于多级分类器(方向图)估计活动区域的微尺度配准方法相互配准。然后,从注册的特征补丁中提取一维特征向量,称为螺旋特征;增量学习过程使用使用螺旋特征原子字典的稀疏表示来执行。将该框架应用于乔治华盛顿数据库,取得了令人满意的结果。
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引用次数: 6
Chaos-based image assessment for THz imagery 基于混沌的太赫兹图像评估
Erik Blasch, Jianbo Gao, W. Tung
Multiscale image processing is a powerful technique that can determine image characteristics (e.g. clutter), provide denoising, and determine object features. Imagery is highly nonstationary (i.e. mean and variance change with location and time) and multiscaled (i.e. dependent on the spatial or temporal interval lengths). In this paper, we utilize the scale-dependent Lyapunov exponent (SDLE), which unifies the principles of fractal and chaos theory, to characterize the different signal behaviors on a wide range of scales simultaneously. Commonly used complexity measures, including those from information theory, chaos theory, and random fractal theory, can all be related to the values of the SDLE at specific scales, and therefore, SDLE can act as the basis for a unified theory of multiscale analysis of complex imagery data. We describe the power-law and singular-value decomposition (SVD) for image processing and demonstrate a SDLE example using TeraHertz (THz) imagery for concealed target image fusion.
多尺度图像处理是一种强大的技术,可以确定图像特征(如杂波),提供去噪和确定目标特征。图像是非平稳的(即平均值和方差随位置和时间变化)和多尺度的(即依赖于空间或时间间隔长度)。结合分形理论和混沌理论的原理,利用尺度相关的李雅普诺夫指数(SDLE)来同时表征信号在大尺度上的不同行为。常用的复杂性度量,包括信息论、混沌理论和随机分形理论,都可以与特定尺度下SDLE的值相关联,因此SDLE可以作为复杂图像数据多尺度分析的统一理论基础。我们描述了幂律和奇异值分解(SVD)用于图像处理,并演示了一个使用太赫兹(THz)图像进行隐藏目标图像融合的SDLE示例。
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引用次数: 9
Probability density function estimators applied to non-stationary signals 应用于非平稳信号的概率密度函数估计
A. Mansour
This manuscript deals with the estimation of probability density functions. This topic is very important in applied mathematics due to its various applications: Blind identification, blind Separation of Sources, risk theory, game theory, statistical modeling, etc. Since the mid of the 20th century, various solutions have been proposed in order to estimate probability density functions of latent variables and random variables. Hereinafter, a brief survey of major approaches is presented. Meanwhile, we prove that most of proposed methods could be considered as kernel density estimation methods. Theoretical proof for a previously used simulation model is also presented. The application of classic estimators to non-stationary signals is also considered. Finally, simulations are presented and discussed.
本文讨论概率密度函数的估计。该主题在应用数学中非常重要,因为它的各种应用:盲识别,盲源分离,风险理论,博弈论,统计建模等。自20世纪中期以来,为了估计潜在变量和随机变量的概率密度函数,人们提出了各种各样的解决方案。以下简要介绍了主要方法。同时,我们证明了所提出的大多数方法都可以看作是核密度估计方法。对先前使用的仿真模型也给出了理论证明。讨论了经典估计量在非平稳信号中的应用。最后给出了仿真结果并进行了讨论。
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引用次数: 0
Analysis of scoliosis trunk deformities using ICA 应用ICA分析脊柱侧凸躯干畸形
Mathias M. Adankon, J. Dansereau, H. Labelle, F. Cheriet
This paper describes a method for analyzing scoliosis trunk deformities using Independent Component Analysis (ICA). Our hypothesis is that ICA can capture the scoliosis deformities visible on the trunk. Unlike Principal Component Analysis (PCA), ICA gives local shape variation and assumes that the data distribution is not normal. 3D torso images of 56 subjects including 28 patients with adolescent idiopathic scoliosis and 28 healthy subjects are analyzed using ICA. First, we remark that the independent components capture the local scoliosis deformities as the shoulder variation, the scapula asymmetry and the waist deformation. Second, we note that the different scoliosis curve types are characterized by different combinations of specific independent components.
本文介绍了一种利用独立分量分析(ICA)分析脊柱侧凸躯干畸形的方法。我们的假设是ICA可以捕捉到躯干上可见的脊柱侧凸畸形。与主成分分析(PCA)不同,ICA给出局部形状变化,并假设数据分布不是正态分布。采用ICA对28例青少年特发性脊柱侧凸患者和28例健康受试者的56例三维躯干图像进行分析。首先,我们注意到独立分量捕获局部脊柱侧凸畸形,如肩部变异,肩胛骨不对称和腰部变形。其次,我们注意到不同的脊柱侧凸曲线类型具有特定独立成分的不同组合特征。
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引用次数: 2
Efficient implementation of tap delay line filter using high speed Digital Signal Processor 利用高速数字信号处理器高效实现分接延迟线滤波器
M. I. Akram, A. Sheikh
An efficient implementation of the linear Finite Impulse Response (FIR) Filter has been performed over the Texas Instrument (TI) TMS320C6416 fixed point Digital Signal Processor (DSP) platform. The implementation fully exploits the pipelined architecture of the processor along with the circular buffering to gain the speed factor of 7 times than the reference approach hence making this more suitable for high speed real-time signal processing applications involving tap delay line (TDL) model.
在德州仪器(TI) TMS320C6416定点数字信号处理器(DSP)平台上进行了线性有限脉冲响应(FIR)滤波器的高效实现。该实现充分利用了处理器的流水线架构和循环缓冲,比参考方法的速度系数提高了7倍,因此更适合涉及分接延迟线(TDL)模型的高速实时信号处理应用。
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引用次数: 0
New versions of the propagator method 传播器方法的新版本
M. Bouri
In this paper, we introduce new technique for localization of narrowband signals. We propose two new versions of the propagator method. Using its algebraic properties, the cross-spectral matrix (CSM) is replaced by the upper triangular matrix (UTM) obtained from the LU or QR factorization of the CSM. The upper triangular matrices are partitioned to estimate the propagator. The LU factorization and Householder QR factorization algorithms need N3/3 and 2N3/3 floating point operations, respectively. The triangular factorization technique can reduce the complexity when compared to eigen subspace method such as MUSIC algorithm requires N3. Simulation results are presented to verify the effectiveness of the proposed methods.
本文介绍了一种新的窄带信号定位技术。我们提出了两个新版本的传播子方法。利用交谱矩阵的代数性质,将交谱矩阵替换为由交谱矩阵的LU分解或QR分解得到的上三角矩阵。对上三角矩阵进行分区以估计传播算子。LU分解和Householder QR分解算法分别需要N3/3和2N3/3个浮点运算。与特征子空间方法(如MUSIC算法)相比,三角分解技术可以降低复杂度。仿真结果验证了所提方法的有效性。
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引用次数: 1
A flexible multi-resolution time-frequency analysis framework for audio signals 一个灵活的音频信号多分辨率时频分析框架
T. Fillon, J. Prado
In this article, a new Constant-Q transform implementation is proposed together with a generalization of both the Short-Term Fourier Transform and the Constant-Q transform. The purpose of this generalization is to provide a discrete time-frequency analysis tool with arbitrary center frequency and frequency resolution for each bin of the transform. This new analysis framework is very flexible and can be related to many common time-frequency transforms. Furthermore, new interesting transforms with specific time-frequency resolutions can be defined. To illustrate and validate the corresponding approach, experimental results and examples are provided for different configurations.
本文提出了一种新的常q变换实现方法,并对短时傅里叶变换和常q变换进行了推广。这种推广的目的是提供一个离散时频分析工具,具有任意中心频率和频率分辨率的每个bin的变换。这种新的分析框架非常灵活,可以与许多常见的时频变换相关联。此外,还可以定义具有特定时频分辨率的新变换。为了说明和验证相应的方法,给出了不同配置下的实验结果和实例。
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引用次数: 6
Statistical and intuitive nonlinear signal processing designs for multiuser interference mitigation in UWB systems 超宽带系统中多用户干扰抑制的统计和直观非线性信号处理设计
N. Beaulieu, D. J. Young
Ultra-wideband (UWB) wireless technologies have the potential to greatly improve the quality of short-range communications between unlicensed wireless devices. By exploiting huge bandwidth, UWB devices can overcome the spectral congestion and performance impairments experienced by narrowband devices operating in common unlicensed frequency bands. On the other hand, strict constraints on the signal power spectral density must be enforced to limit spectral emissions, so while UWB is unlicensed, the properties of transmitted signals must be regulated. In the impulse radio (IR) class of UWB systems, a number of pulses are used to transmit one information symbol and the pulses are randomly time-shifted within a frame structure to avoid collisions with other users. Low power spectral density is maintained by transmitting many pulses and the receiver integrates the pulses to achieve sufficient energy for low error rates. Impulse radio systems employing such time-hopping (TH) and repetition code designs are characterized by low duty cycle transmission, with transmitted signal energy occupying only a small fraction of the available transmission time. Although the TH scheme is intended to prevent catastrophic interference between multiuser TH-UWB transmissions, multiple-user interference (MUI) can impair uncoordinated transmissions in applications where several UWB devices are located at close range. In this talk, we show that the signal processing adopted in conventional UWB receivers does not fully exploit the TH code and has poor performance in the presence of significant MUI. Statistical signal processing based on the properties of MUI in TH-UWB is discussed, and two classes of techniques for mitigation of MUI are presented. The first class uses statistical characterizations of the MUI-plus-AWGN disturbance in the received THUWB signals as a basis for statistical receiver processing structures. The second class uses intuitive interference-sensing techniques specifically developed for the low duty cycle TH-UWB signal format, which control the processing of pulse replicas at the receiver. Both methods lead to greatly improved bit error rate performance compared to the conventional receiver processing. Both types of interference mitigation can be powerfully and efficiently used in a single receiver, and composite receiver designs that provide superior performance are discussed.
超宽带(UWB)无线技术有潜力极大地改善无授权无线设备之间的短距离通信质量。通过利用巨大的带宽,超宽带设备可以克服频谱拥塞和在普通无许可频带中运行的窄带设备所经历的性能损害。另一方面,必须严格限制信号功率谱密度以限制频谱发射,因此在UWB未获许可的情况下,必须对发射信号的特性进行调节。在脉冲无线电(IR)类超宽带系统中,使用多个脉冲来传输一个信息符号,这些脉冲在一个帧结构内随机时移,以避免与其他用户发生碰撞。通过发射多个脉冲来保持低功率谱密度,接收机对脉冲进行集成以获得足够的能量以实现低错误率。脉冲无线电系统采用这种跳时(TH)和重复码设计的特点是低占空比传输,传输的信号能量仅占可用传输时间的一小部分。虽然TH方案旨在防止多用户TH-UWB传输之间的灾难性干扰,但在多个UWB设备位于近距离的应用中,多用户干扰(MUI)会损害不协调传输。在本次演讲中,我们展示了传统UWB接收机中采用的信号处理不能充分利用TH码,并且在存在显著MUI的情况下性能较差。讨论了TH-UWB中基于MUI特性的统计信号处理,并提出了两类缓解MUI的技术。第一类使用接收到的THUWB信号中mui + awgn干扰的统计特征作为统计接收器处理结构的基础。第二类使用直观的干扰传感技术,专门为低占空比TH-UWB信号格式开发,控制接收器脉冲副本的处理。与传统的接收机处理相比,这两种方法都大大提高了误码率性能。这两种类型的干扰缓解都可以在单个接收器中有效地使用,并且讨论了提供优越性能的复合接收器设计。
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引用次数: 4
Superimposed training synchronization for Widely Linear systems 广义线性系统的叠加训练同步
I. A. Arriaga-Trejo, A. Orozco-Lugo, Arturo Veloz-Guerrero, Manuel E. Guzman-Renteria
In this paper, the training sequence synchronization (TSS) problem for Widely Linear (WL) system estimation is addressed. This problem appears when superimposed training (ST) is considered as the methodology to perform the identification of WL systems. The proposed method exploits the ciclostationarity induced in the process at the output of the WL system when training sequences generating circulant augmented matrices are employed. Unlike strictly linear (SL) systems, where the delay required to achieve synchronization is unique, for WL systems two possible solutions appear. It is here shown that the correct synchronization delay can be distinguished if further characteristics of the WL system are known in advance.
研究了广义线性(WL)系统估计中的训练序列同步问题。当将叠加训练(ST)作为识别WL系统的方法时,就会出现这个问题。该方法利用了生成循环增广矩阵的训练序列在WL系统输出过程中产生的循环平稳性。与严格线性(SL)系统不同,实现同步所需的延迟是唯一的,对于WL系统有两种可能的解决方案。本文表明,如果提前知道WL系统的进一步特性,可以区分正确的同步延迟。
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引用次数: 2
期刊
2012 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA)
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