基于小波包变换和蚁群算法的纹理分类

提出了一种小波包变换和蚁群算法相结合的纹理分类新方法。首先采用小波包变换提取纹理图像的纹理特征向量,然后用蚁群算法进行训练和分类。实验表明小波包变换和蚁群算法应用到纹理分类领域,是一次有效的尝试。     

纺织品检测中的模式识别应用

将模式识别方法用于毛巾和纺织面料生产过程中的瑕点检测, 研究了模糊小波模式识别方法, 对毛巾生产过程的多种瑕点监测进行了算法分析和简要论述, 这种算法具有更强的实用性和鲁棒性. 又由于系统采用DSP实现, 使识别速度大大提高, 完全能满足实时性的要求.     

复杂系统的递阶模糊辨识

针对Takagi_Sugeno模糊模型 (T_S模型 )严重的维数灾问题, 借鉴GMDH算法, 提出了一种新的复杂系统递阶模糊辨识方法. 本文首先详细描述了由两输入变量的特殊T_S模型所组成的递阶模糊模型 ;然后提出了具体的辨识该递阶模糊模型的方法. 该方法的特点是 :a)在结构辨识阶段, 用FCM模糊聚类方法评价系统中每个输入变量的重要性, 以便构造合理的递阶模糊模型 ;b)预先合理地确定了所要辨识的参数的初始值, 用扩展卡尔曼滤波方法可很快地得到这些参数. 最后, 给出的仿真实例说明了本文辨识方法的有     

基于小波分析和分层决策的模拟电路故障识别方法*

针对模拟电路存在较多故障模式的诊断中易出现分类混叠的问题,提出一种小波分析和分层决策的故障识别方法。首先用小波变换方法提取电路的两种故障特征,模糊C均值算法分析故障特征数据的分布特性,以决策树的形式分割各故障子类。通过对决策树节点特征的优化选择,使各故障子类的区分得以最大化。最后按照决策树结构建立分级诊断的故障决策系统,分别以支持向量机和神经网络作为树节点分类器,有效地提高了故障的识别率。该方法应用于高通滤波器电路的故障识别,正确率高于99%,比经典支持向量机多分类方法具有更好的诊断性能。     

粗糙集与模糊系统集成的化学模式分类方法及其应用

模糊方法是一种有效的化学模式分类方法,但模糊规则的获取和相关参数的确定较为困难。对此,本文采用粗糙集方法,无需任何先验知识,约简系统,获取最简规则集,在此基础上构建结构合理．适用于分类的模糊-神经网络系统,并根据规则的统计性质和离散化结果初始化网络参数,采用LM方法训练网络;在橄榄油模式分类建模的应用中,该方法训练收敛速度快,所建模型预测性能良好,要优于现代统计方法和前馈神经网络。     

Comparison of wavelet families for texture classification by using wavelet packet entropy adaptive network based fuzzy inference system

Recently, significant of the robust texture image classification has increased. The texture image classification is used for many areas such as medicine image processing, radar image processing, etc. In this study, a new method for invariant pixel regions texture image classification is presented. Wavelet packet entropy adaptive network based fuzzy inference system (WPEANFIS) was developed for classification of the twenty 512 × 512 texture images obtained from Brodatz image album. There, sixty 32 × 32 image regions were randomly selected (overlapping or non-overlapping) from each of these 20 images. Thirty of these image regions and other 30 of these image regions are used for training and testing processing of the WPEANFIS, respectively. In this application study, Daubechies, biorthogonal, coiflets, and symlets wavelet families were used for wavelet packet transform part of the WPEANFIS algorithm, respectively. In this way, effects to correct texture classification performance of these wavelet families were compared. Efficiency of WPEANFIS developed method was tested and a mean %93.12 recognition success was obtained.     

基于小波包与模糊聚类算法的声波法检测流化床内颗粒的平均粒度

平均粒径是气固流化床反应器运行时需要监控的重要参数之一,利用声波信号检测床内颗粒平均粒度的方法能克服传统方法不能实时在线测量的缺陷,安全环保不侵入流场.先用Db5小波包将声发射信号3尺度分解,求出各细节信号小波系数的绝对值加和,构成声信号的能量模式,标准化之后经主成分分析得出主成分,再用模糊均值聚类方法分类.由于不同粒度的声波信号经小波包分解后,其小波系数绝对值加和具有特定的模式,因而,这种方法分类准确性达98%以上.     

基于小波隶属函数的模糊推理规则优化

隶属函数决定着模糊集的特征,建立小波基函数与隶属函数之间的联系,从而利用小波分析探讨模糊推理的实质,以一种非对称Haar小波基与三角型、梯型隶属函数的对应关系为基础,将小波分析、遗传算法与模糊系统结合,利用遗传算法实现小波隶属函数的训练学习,进而实现模糊推理规则的优化。     

基于小波隶属函数的模糊推理规则优化

隶属函数决定着模糊集的特征，建立小波基函数与隶属函数之间的联系，从而利用小波分析探讨模糊推理的实质，以一种非对称Haar小波基与三角型、梯型隶属函数的对应关系为基础，将小波分析、遗传算法与模糊系统结合，利用遗传算法实现小波隶属函数的训练学习，进而实现模糊推理规则的优化。     

基于T S模型的模糊系统辨识方法综述*

模糊模型设计方法归结为两种,即语义驱动和数据驱动。数据驱动模型具有更好的性能,是目前研究的热点。模糊系统辨识是数据驱动下模糊系统建模的重要手段,辨识的优良直接影响系统建模的精度。模糊系统辨识可以分为两部分进行认识,即模糊系统结构辨识和参数辨识。回顾了近年来模糊系统辨识的理论和方法,如subtractive聚类、多分辨率自适应空间分解、SVM、核函数法、粒子群算法和并行遗传算法等。对各种算法原理、特点进行了介绍,对模糊系统辨识的发展进行了展望。     

基于T S模型的模糊系统辨识方法综述*

模糊模型设计方法归结为两种,即语义驱动和数据驱动。数据驱动模型具有更好的性能,是目前研究的热点。模糊系统辨识是数据驱动下模糊系统建模的重要手段,辨识的优良直接影响系统建模的精度。模糊系统辨识可以分为两部分进行认识,即模糊系统结构辨识和参数辨识。回顾了近年来模糊系统辨识的理论和方法,如subtractive聚类、多分辨率自适应空间分解、SVM、核函数法、粒子群算法和并行遗传算法等。对各种算法原理、特点进行了介绍,对模糊系统辨识的发展进行了展望。     

Stability analysis in identification of interval type‐2 adaptive neuro‐fuzzy inference system: Contribution to a novel Lyapunov function

In recent years, control research has strongly highlighted the issue of training stability in the identification of non‐linear systems. This paper investigates the stability analysis of an interval type‐2 adaptive neuro‐fuzzy inference system (IT2ANFIS) as an identifier through a novel Lyapunov function. In so doing, stability analysis is initially conducted on the IT2ANFIS identifier, while performing the online training of both the antecedent and the consequent parameters by the gradient descent (GD) algorithm. In addition, the same stability analysis is carried out when the antecedent and the consequent parameters are trained by GD and forgetting factor recursive least square (FRLS) algorithms, respectively (GD + FRLS). A novel Lyapunov function is proposed in this study in order for the identifier stability to attain the required conditions. These conditions determine the permissible boundaries for the covariance matrix and the learning rates at every iteration of the identification procedure. Stability analysis reveals that wide range of learning rates is obtained. Furthermore, simulation results indicate that when the permissible boundaries are selected according to the proposed stability analysis, a stable identification process with appropriate performance is achieved.     

Non-singleton genetic fuzzy logic system for arrhythmias classification

This paper aims at analyzing a non-singleton fuzzy logic classifier (NSFLC) and assessing its ability to cope with uncertainties in pattern classification problems. The analysis demonstrate that the NSFLC has fuzzy classification boundary and noise suppression capability. These characteristics means that the NSFLC is particulary suitable for problems where the boundaries between classes is non-distinct. To further demonstrate the benefits offered by a NSFLC, a non-singleton fuzzy logic classifier evolved using Genetic Algorithm (GA) is assessed using a benchmark cardiac arrhythmias classification problem. Results indicate that a NSFLC achieved good classification accuracy using features that are easier to extract, but contain more uncertainties.     

PCA与移动窗小波变换的高光谱决策融合分类

目的 高光谱数据具有较高的谱间分辨率和相关性,给分类处理带来了一定的困难.为了提高分类精度,提出一种结合PCA与移动窗小波变换的高光谱决策融合分类算法.方法 首先,利用相关系数矩阵对原始高光谱数据进行波段分组;然后,利用主成分分析对每组数据进行谱间降维;再根据提出的移动窗小波变换法进行空间特征提取;最后,采用线性意见池(LOP)决策融合规则对多分类器的分类结果进行融合.结果 采用两组来自不同传感器的数据进行实验,所提算法的分类精度和Kappa系数均高于已有的5种分类算法.与SVM-RBF算法相比,本文算法的分类精度高出了8％左右.结论 实验结果表明,本文算法充分挖掘了高光谱图像的谱间-空间信息,能有效提高分类正确率,在小样本情况下和噪声环境中也具有良好的分类性能.     

On-line tool condition monitoring system with wavelet fuzzy neural network

In manufacturing systems such as flexible manufacturing systems (FMS), one of the most important issues is accurate detection of the tool conditions under given cutting conditions. An investigation is presented of a tool condition monitoring system (TCMS), which consists of a wavelet transform preprocessor for generating features from acoustic emission (AE) signals, followed by a high speed neural network with fuzzy inference for associating the preprocessor outputs with the appropriate decisions. A wavelet transform can decompose AE signals into different frequency bands in the time domain. The root mean square (RMS) values extracted from the decomposed signal for each frequency band were used as the monitoring feature. A fuzzy neural network (FNN) is proposed to describe the relationship between the tool conditions and the monitoring features; this requires less computation than a back propagation neural network (BPNN). The experimental results indicate the monitoring features have a low sensitivity to changes of the cutting conditions and FNN has a high monitoring success rate in a wide range of cutting conditions; TCMS with a wavelet fuzzy neural network is feasible.     

模糊神经网络的混沌优化算法设计

提出了一种基于混沌变量的多层模糊神经网络优化算法设计.离线优化部分采用混沌算法,将混沌变量引入到模糊神经网络结构和参数的优化搜索中,使整个网络处于动态混沌状态,根据性能指标在动态模糊神经网络中寻找较优的网络结构和参数.在线优化部分采用梯度下降法,把混沌搜索后得到的参数全局次优值作为梯度下降搜索的初始值,进一步调整模糊神经网络的参数,实现混沌粗搜索和梯度下降细搜索相结合的优化目的,能较快地找到全局最优解.最后对二阶延迟系统进行仿真,结果表明混沌优化方法控制精度高、超调小、响应快和鲁棒性强.     

模糊分类系统的邻域原理设计算法

使用支持向量机算法直接求海量数据的模糊分类系统是相当困难的.为了解决这个问题,提出了基于邻域原理设计模糊分类系统的方法.将支持向量机的理论建立在距离空间上,设计出了计算支持向量的邻域算法;利用所求的支持向量,基于平分最近点方法设计出了求分类超平面的算法,求出模糊分类系统,该算法优于基于支持向量机直接求模糊分类系统的方法.实验结果说明,该方法可有效地解决对海量数据的模糊分类系统的设计问题.     

Gradient‐based back‐propagation dynamical iterative learning scheme for the neuro‐fuzzy inference system

In this paper, a gradient‐based back propagation dynamical iterative learning algorithm is proposed for structure optimization and parameter tuning of the neuro‐fuzzy system. Premise and consequent parameters of the neuro‐fuzzy model are initialized randomly and then tuned by the proposed iterative algorithm. The learning algorithm is based on the first order partial derivative of the output with respect to the structure parameters. The first order derivative of the model output with respect to the structure parameters determines the sensitivity of the model to structure parameters. The sensitivity values are then used to set the tuning factors and parameters updating step sizes. Therefore, an adaptive dynamical iterative scheme is achieved which adapts the learning procedure to the current state of the performance during the optimization process. Larger tuning step sizes make the convergence speed higher and vice versa. In this regard, this parameter is treated according to the calculated sensitivity of the model to the parameter. The proposed learning algorithm is compared with the least square back propagation method, genetic algorithm and chaotic genetic algorithm in the neuro‐fuzzy model structure optimization. Smaller mean square error and shorter learning time are sought in this paper, and the performance of the proposed learning algorithm is versified regarding these criteria.     

小波神经网络在飞控系统辨识中的应用研究

选择以sigmoid函数为基础的小波基波函数构造了一个小波神经网络,利用小波网络对复杂的飞控系统对象进行在线辨识研究,仿真结果表明小波神经网络基本满足某型飞机飞控系统在线辨识的要求。     

New dynamic fuzzy structure and dynamic system identification

In this study, a new fuzzy system structure that reduces the number of inputs is proposed for dynamic system identification applications. Algebraic fuzzy systems have some disadvantages due to many inputs. As the number of inputs increase, the number of parameters in the training process increase and hence the classical fuzzy system becomes more complex. In the conventional fuzzy system structure, the past information of both inputs and outputs are also regarded as inputs for dynamic systems, therefore the number of inputs may not be manageable even for single input and single output systems. The new dynamic fuzzy system module (DFM) proposed here has only a single input and a single output. We have carried out identification simulations to test the proposed approach and shown that the DFM can successfully identify non-linear dynamic systems and it performs better than the classical fuzzy system.