一种基于混合核函数的SOM网络流量分类方法

由于传统的自组织映射SOM方法对高维、非线性的网络流量数据的分类性能效果不佳,本文引入核方法,提出一种基于混合核函数的SOM(MIX-KSOM)网络流量分类方法。该方法结合了全局性和局部性核函数的优点,采用径向基函数和多项式函数线性组合构成的混合核函数代替内积作为距离度量,使输入空间中复杂的流量样本在特征空间得以简化。实验结果表明,采用MIX-KSOM方法能较好地对网络流量进行分类,较传统的SOM、采用单一核函数的SOM(KSOM)分类方法性能更好,分类准确率也高于NB方法。     

基于自组织神经网络的遥感图像分类应用研究

在地形复杂地区,采用传统的遥感分类方法进行土地利用遥感分类很难获得理想的精度。针对遥感图像分类的特点,根据自组织竞争神经网络的生物学基础、基本结构和学习算法,利用Matlab平台构建自组织神经网络,对地形复杂区的ETM 遥感图像通过500次训练使网络收敛后,仿真输出分类图。结果表明,基于自组织神经网络的分类器经过训练后,可用于遥感图像的分类,其分类精度明显高于传统的最大似然法。     

基于自组织神经网络的多传感器遥感图像融合技术

多传感器遥感图像融合是一种遥感信息综合分析与处理的技术,其研究正成为遥感学科领域的热门课题之一。利用自组织特征映射神经网络具有较好的聚类特性,对多源遥感图像进行高水平的分类与融合。通过对GMS 5卫星图像融合前后性质的比较和融合质量的评估,不难发现:融合后的图像不论在视觉效果上还是在噪声特性上都有了很大的改善。     

基于核函数的SOM网络流量分类方法

由于网络流量数据高度非线性,传统的自组织映射(self-organizing maps,SOM)网络对此分类的鲁棒性和可靠性较差,提出了一种基于核函数的SOM(kernel SOM,KSOM)网络流量分类方法。该方法用核函数代替原始数据在特征空间中映射值的内积,使输入空间中复杂的流量样本结构在特征空间中得到简化,实现对有多个统计特征属性的网络流量在应用层的分类。实验结果表明,KSOM能识别新应用类型的流量,较传统的SOM更适合对网络流量进行分类,其分类准确率高于NB方法。     

基于PSO-混合核函数的SOM网络流量分类研究

针对基于核函数的自组织特征映射SOM(Self-organizing feature Map)算法中核函数的单一性选取和核函数参数的不确定性,提出一种基于PSO-混合核函数的SOM算法。用两种核函数混合构造新的核函数,采用改进的粒子群算法PSO对核函数中的参数以及两种核函数的混合参数进行优化确定,并应用于网络流量数据。实验结果表明,基于PSO-混合核函数的SOM算法,相对于传统的SOM算法以及单一核函数SOM算法,分类的可靠性和稳定性有明显的提高。     

改进的波段选择混合核函数遥感图像分类算法

针对遥感图像多波段不易成像、其图像信息冗余不适合图像分类以及传统LMBP算法迭代次数多且分类不够精确的问题,改进了OIF指数和可分性距离公式,分组并选出遥感图像最佳波段组合,并运用改进的LMBP混合核函数算法进行分类。仿真实验表明,改进算法对各波段信息分析更加全面客观,波段选择更加优化;与传统算法相比,网络训练迭代次数有明显减少,分类精度及Kappa系数分别提高了5%和6.625%,遥感图像分类更有效。     

基于自组织特征映射神经网络的土壤分类

人工神经网络中的自组织特征映射网络具有较强的聚类功能,将自组织特征映射神经网络模型应用于土壤分类,提取影响土壤分类的七个理化因子,根据19个土壤样本建立神经网络,最后验证10个土壤样本的分类结果是否正确。分析结果表明,这种方法是十分有效和方便的。同时,本文对分类结果进行分析和讨论,指出利用该模型强大的学习功功能及很好的自适应性、自组织性和鲁棒性可以为土壤分类提供一种快速、准确的信息处理手段。     

基于模糊高斯基函数神经网络的遥感图像分类

针对遥感图像分类的特点,提出了一种基于模糊高斯基函数神经网络的遥感图像分类器。该分类器将模糊技术与神经网络相结合,采用神经网络来实现模糊推理,利用神经网络的学习能力来达到调整模糊隶属函数和模型规则的目的,从而使系统具备了自适应的特性,实验结果表明,这种基于模糊高斯基孙数神经网络的分类器经过训练后,可应用于遥感图像的分类,其分类精度明显高于传统的最大似然分类法。     

基于自组织特征映射神经网络的医学图像分割技术

采用一维自组织特征映射神经网络对医学图像进行聚类分析,实现对不同组织的自动分割.避免了直接使用灰度门限分割方法由于门限值选择不当所导致的分割结果有失准确性的缺点.试验结果表明,利用该方法能够较好地保证分割结果的准确性和完整性.     

遥感图像分类的LMBP核函数改进算法

在核函数的基础上采用向量扩展的方法改进传统的LMBP算法,将输入向量由低维转换到高维,充分利用误差函数的一二阶导数信息,同时结合传统LMBP算法的优点提高网络训练的收敛速度。仿真实验结果表明,改进方法网络训练的迭代次数更少,分类精度更高,对遥感图像分类更有效。     

A central-point-enhanced convolutional neural network for high-resolution remote-sensing image classification

As one of the most important algorithms in the field of deep learning technology, the convolutional neural network (CNN) has been successfully applied in many fields. CNNs can recognize objects in an image by considering morphology and structure rather than simply individual pixels. One advantage of CNNs is that they exhibit translational invariance; when an image contains a certain degree of distortion or shift, a CNN can still recognize the object in the image. However, this advantage becomes a disadvantage when CNNs are applied to pixel-based classification of remote-sensing images, because their translational invariance characteristics causes distortions in land-cover boundaries and outlines in the classification result image. This problem severely limits the application of CNNs in remote-sensing classification. To solve this problem, we propose a central-point-enhanced convolutional neural network (CE-CNN) to classify high-resolution remote-sensing images. By introducing the central-point-enhanced layer when classifying a sample, the CE-CNN increases the weight of the central point in feather maps while preserving the original textures and characteristics. In our experiment, we selected four representative positions on a high-resolution remote-sensing image to test the classification ability of the proposed method and compared the CE-CNN with the traditional multi-layer perceptron (MLP) and a traditional CNN. The results show that the proposed method can not only achieves a higher classification accuracy but also less distortion and fewer incorrect results at the boundaries of land covers. We further compared the CE-CNN with six state-of-the-art methods: k-NN, maximum likelihood, classification and regression tree (CART), MLP, support vector machine, and CNN. The results show that the CE-CNN’s classification accuracy is better than the other methods.     

一种自适应停止的SOM神经网络及其应用

RFID采集的车辆信息可以识别营运车辆的运行规律,采用这种方法能找出运行规律类似营运车辆的私家车,并判定为疑似非法营运车辆。应用SOM神经网络聚类时,初始化网络需要设置各种参数。为此,提出一种自适应确定网络训练次数的方法,利用权值导数来判断是否停止训练。利用UCI数据集对传统的和改进后的网络进行测试并对比,发现改进后的网络优于传统网络。最后,将改进后的网络用在车辆运行规律识别中,得到预期的效果。     

基于卷积神经网络的遥感图像分类研究

遥感图像分类是模式识别技术在遥感领域的具体应用,针对遥感图像处理中的分类问题,提出了一种基于卷积神经网络(convolutional neural networks,CNN)的遥感图像分类方法,并针对单源特征无法提供有效信息的问题,设计了一种多源多特征融合的方法,将遥感图像的光谱特征、纹理特征、空间结构特征等按空间维度以向量或矩阵的形式进行有效融合,以此训练CNN模型。实验表明,多源多特征相融合能够加快模型收敛速度,有效提高遥感图像的分类精度;与其他分类方法相比,CNN能够取得更高的分类精度,获得更优的分类效果。     

SOM神经网络改进及在遥感图像分类中的应用*

针对自组织特征神经网络自身算法的特点和缺陷,采用遗传算法对网络进行改进,形成了基于遗传算法的自组织特征神经网络,并从输入向量、竞争层神经元数量设置和初始权向量设定三方面,结合遥感图像的特性对自组织特征映射网络遥感图像分类的方法进行了改进。将该方法应用于择西安地区的ETM+卫星遥感图像进行分类试验,结果表明,基于遗传算法的自组织特征映射网络使得遥感图像的分类精度更高,且该算法实现简单,具有一定的工程应用价值。     

An incremental-learning neural network for the classification of remote-sensing images

A novel classifier for the analysis of remote-sensing images is proposed. Such a classifier is based on Radial Basis Function (RBF) neural networks and relies on an incremental-learning technique. This technique allows the periodical acquisition of new information whenever a new training set becomes available, while preserving the knowledge learnt by the network on previous training sets. In addition, in each retraining phase, the network architecture is automatically updated so that new classes may be considered. These characteristics make the proposed neural classifier a promising tool for several remote-sensing applications.     

Convolutional neural network based heterogeneous transfer learning for remote-sensing scene classification

ABSTRACT

Deep convolutional neural network (CNN) transfer has recently shown strong performance in scene classification of high-resolution remote-sensing images. However, the majority of transfer learning solutions are categorized as homogeneous transfer learning, which ignores differences between target and source domains. In this paper, we propose a heterogeneous model to transfer CNNs to remote-sensing scene classification to correct input feature differences between target and source datasets. First, we extract filters from source images using the principal component analysis (PCA) method. Next, we convolute the target images with the extracted PCA filters to obtain an adopted target dataset. Then, a pretrained CNN is transferred to the adopted target dataset as a feature extractor. Finally, a classifier is used to accomplish remote-sensing scene classification. We conducted extensive experiments on the UC Merced dataset, the Brazilian coffee scene dataset and the Aerial Images Dataset to verify the effectiveness of the proposed heterogeneous model. The experimental results show that the proposed heterogeneous model outperforms the homogeneous model that uses pretrained CNNs as feature extractors by a wide margin and gains similar accuracies by fine-tuning a homogeneous transfer learning model with few training iterations.     

基于MM分词算法与SOM神经网络的分类方法研究

针对文本信息的分类问题,提出正向最大匹配分词算法与自组织映射神经网络融合算法(MMSOM)。利用正向最大匹配分词算法对文本信息进行自动提取,设定关键词信息规范框架,将规范化后的文本信息量化结果作为神经网络输入,结合文本分词结果,实现分类对象信息提取与分类的自动化。将该算法应用于藻类水华领域专家分类问题,分类结果表明了算法的可行性和有效性。     

Quantum convolutional neural network for image classification

Pattern Analysis and Applications - In this paper we propose two scale-inspired local feature extraction methods based on Quantum Convolutional Neural Network (QCNN) in the Tensorflow quantum...     

A modified object-oriented classification algorithm and its application in high-resolution remote-sensing imagery

High-resolution satellite images offer abundant information on the Earth's surface for remote-sensing applications. The traditional pixel-based image classification method only used by spectral information has been proved to have several drawbacks. To satisfactorily interpret high-resolution imagery, other important information such as geometry, texture and semantics must be used, which are represented not only in single pixels but in meaningful image objects. So, a modified high-resolution image classification algorithm with multi-characteristics based on objects is presented in this article. First, image objects are extracted by multi-scale multi-characteristic segmentation. Second, characteristics such as spectral information, geometry, texture and semantics are extracted by the corresponding extraction algorithm. Finally, the image objects are classified by means of fuzzy-logic classification with a weighted average calculation method. Preliminary results show promise in terms of classification quality and accuracy.     

小波神经网络在图像配准中的应用

提出了一种基于小波网络的图像配准方法。将特征点定义进行了推广,提出了一种以特征区域定义和提取方法。使用Zernike矩表征区域的特征并进行特征区域的对应。因图像配准变换是复杂且难以预知的,利用小波神经网络具有良好的函数逼近性能,提出了具有局域特性的小波神经网络模型逼近图像的配准变换。实验表明这是一种有效的图像配准方法。