基于SVM的SAR图像分类研究

支持向量机（SVM）是一种卓越的分类方法,灰度共生矩阵（GLCM）则是一种很好的纹理分析方法,而纹理是合成孔径雷达（SAR）图像分类的一个重要特征,故而提出了一种使用灰度共生矩阵进行特征提取的应用支持向量的SAR图像分类法。实验结果证明了支持向量机算法的可行性和有效性。     

基于支持向量机技术的粮虫图像分类技术研究

介绍了支持向量机的基本思想,提出了一个基于支持向量机的粮虫模式识别系统。该系统先对粮虫图像进行小波边缘提取,根据灰度共生矩阵和局部统计方法提取小波分割后的图像纹理特征。最后利用支持向量机对粮虫图像进行分类。     

基于小波灰度共生矩阵的植物分类研究

为了解决塔式小波分解中丢失高频信息的问题,提出了将塔式小波分解和灰度共生矩阵融合的方法,生成小波灰度共生矩阵特征来描述植物叶子纹理,结合具有尺度、平移和旋转不变性的形状特征,生成一组有效的分类特征向量来对植物种类进行分类预测。用支持向量机(support vector machine,SVM)等分类器对两组实验数据进行分类测试,分类准确率分别达到了97.2426%和96.7972%。实验结果表明,小波灰度共生矩阵特征能够有效地描述植物叶子纹理特征,具有很强的分类能力。     

基于多特征融合的织物瑕疵检测研究

织物瑕疵纹理特征复杂,单一特征不能很好地反映纹理信息。为此,本文提出一种基于局部二进制模式(Local Binary Pattern,LBP)算子和灰度共生矩阵(Gray Level Co-occurrence Matrix,GLCM)的多特征融合算法。首先,对LBP算子进行了改进,提出一种基于邻域像素中值的中心对称LBP算子;然后,将其提取出的纹理特征和灰度共生矩阵提取的纹理特征进行融合;最后,通过极速学习机和支持向量机做分类实验,验证融合特征描述织物瑕疵纹理特征的能力。实验表明,本文方法提高了织物物疵点检测率,并且具有很好的抗干扰能力。     

基于K型支持向量机的遥感图像分类新算法

为了提高遥感图像的分类精度和识别速度,提出了一种基于K型支持向量机（SVM）的遥感图像分类新算法,该算法将灰度共生矩阵提取的纹理特征与光谱特征相结合进行分类。对两组Landsat ETM+数据进行分类仿真实验,结果表明,在多光谱遥感图像的分类中,新算法提高了分类效率、分类精度和泛化能力,K型SVM是一种优于径向基函数SVM的分类器。     

基于改进的CNN多级分类的行人检测算法研究

针对监控场景的行人检测应用,提出一种结合改进的支持向量机和卷积神经网络的行人检测方法。首先,通过运动检测初步定位感兴趣的可疑目标区域;然后,计算这些区域图像块的灰度共生矩阵,并采用主成分分析方法提取纹理特征向量,采用支持向量机进行纹理分类,滤除干扰区域;最后,对余下区域构建多尺度图像子块,采用LeNet5卷积神经网络架构进行行人分类。在Caltech数据集上的测试结果表明,该方法的真正率指标高,假正率指标低。     

基手小波变换和支持向量机的遥感图像目标检测

探讨基于支持向量机的高分辨率遥感图像中某型号飞机的检测识别问题.提出将小波变换结合灰度共生矩阵法提取目标样本信息特征的一种新方法,通过对Brodatz纹理进行测试,实验表明该方法有效提高了纹理分类识别率.此外,将支持向量机方法运用于遥感图像目标识别中,用分块区域搜索的方法检测到目标所在区域,实现对目标的检测识别.试验表明,该方法快速、高效且具备一定的鲁棒性.     

基于SVM和纹理的煤和煤矸石自动识别

为提高煤矸石的自动识别和分选效率,提出了基于支持向量机(SVM)和纹理识别煤矸石的方法.选取两种煤和一种煤矸石的图像作为样本,经过图像预处理及图像灰度和纹理特征分析后,发现灰度均值、灰度共生矩阵最大值、二阶矩、对比度、相关、熵为有效特征.在此基础上,采用了支持向量机来完成图像的自动识别过程,选取上述6个参数作为支持向量机的训练特征,实验结果表明,该支持向量机识别煤和煤矸石的成功率较高.     

基于支持向量机的条烟包装外观缺陷检测

针对卷烟生产过程中条烟包装外观缺陷问题,提出一种基于支持向量机(SVM)的条烟包装缺陷图像检测方法。该方法首先采用模板匹配法定位条烟检测区域;然后利用Haar小波变换进行频域分解,并通过灰度共生矩阵算法对频域图提取纹理特征;最后结合纹理特征建立条烟支持向量机分类模型,对待测样本进行分类识别。结果表明:基于SVM分类模型的识别率为96.1%,该方法通用性强,实时性好,满足条烟异常情况检测要求。与BP神经网络测试性能相比,分类性能优于BP神经网络。     

面向河长制的河湖“乱占”现象遥感监测技术研究

为服务于河湖"清四乱"行动,加强河长对"乱占"问题的管理,以围湖造田和坑塘养殖2种"乱占"现象为研究对象,提出基于综合指数法、灰度共生矩阵及支持向量机等多种方法的"乱占"目标识别机制。运用高分辨率遥感影像,分别使用指数法和灰度共生矩阵提取"乱占"目标的光谱和纹理特征,并在融合光谱与纹理特征的基础上,利用支持向量机进行监督分类,输出混淆矩阵分析分类精度。研究结果表明:该方法应用于围湖造田和坑塘养殖2类"乱占"目标识别效果良好,能够有效减少实地调研工作量,为各级河长监督整改河湖"四乱"问题提供技术支撑。     

结合多特征和SVM的SAR图像分割

为实现灰度共生矩阵(GLCM)多尺度、多方向的纹理特征提取, 提出了一种结合非下采样轮廓变换(NSCT)和GLCM的纹理特征提取方法。先用NSCT对合成孔径雷达(SAR)图像进行多尺度、多方向分解; 再对得到的子带图像使用GLCM提取灰度共生量; 然后对提取的灰度共生量进行相关性分析, 去除冗余特征量, 并将其与灰度特征构成多特征矢量; 最后, 充分利用支持向量机(SVM)在小样本数据库和泛化能力方面的优势, 由SVM完成多特征矢量的划分, 实现SAR图像分割。实验结果表明, 基于NSCT域的GLCM纹理提取方法和多特征融合用于SAR图像分割, 可以提高分割准确率, 获得较好的边缘保持效果。     

A spectral–textural kernel-based classification method of remotely sensed images

Most studies have been based on the original computation mode of semivariogram and discrete semivariance values. In this paper, a set of texture features are described to improve the accuracy of object-oriented classification in remotely sensed images. So, we proposed a classification method support vector machine (SVM) with spectral information and texture features (ST-SVM), which incorporates texture features in remotely sensed images into SVM. Using kernel methods, the spectral information and texture features are jointly used for the classification by a SVM formulation. Then, the texture features were calculated based on segmented block matrix image objects using the panchromatic band. A comparison of classification results on real-world data sets demonstrates that the texture features in this paper are useful supplement information for the spectral object-oriented classification, and proposed ST-SVM classification accuracy than the traditional SVM method with only spectral information.     

综合灰度与纹理特征的高分辨率星载SAR图像建筑区提取方法研究

高分辨率SAR图像的纹理特性对于图像的解译及地物分类等具有重要的意义。根据高分辨率星载SAR图像上建筑区的纹理有别于其他地物的特点,提出了一种综合利用灰度和纹理特征的高分辨率星载SAR图像建筑区提取方法。首先对SAR图像进行斑点噪声的抑制,然后利用灰度共生矩阵计算出星载SAR图像上建筑区与非建筑区的8种纹理特征统计量,根据巴氏距离进行特征选择,并通过主成分分析去除纹理特征之间的相关性,得到了最佳纹理特征分量,将所选的特征影像与原始图像进行波段组合,利用K均值聚类算法对组合后的图像进行非监督分类;最后通过对分类图像进行后处理并提取外部轮廓,提取了建筑区。以COSMO-SkyMed SAR影像为数据源进行了实验。结果表明该方法能够有效提取高分辨率星载SAR图像中的建筑区,提取效果明显优于未利用纹理特征的方法。     

Three robust features extraction approaches for facial gender classification

This research paper introduces three robust approaches for features extraction for gender classification. The first approach is based on using Discrete Cosine Transform (DCT) and consists of two different methods for calculating features values. The second approach is based on the extraction of texture features using the gray-level cooccurrence matrix (GLCM). The third approach is based on 2D-wavelet transform. The extracted features vectors are classified using SVM. For precise evaluation, the databases used for gender evaluation are based on images from the AT@T, Faces94, UMIST, and color FERET databases. K-fold cross validation is used in training the SVM. The accuracies of gender classification when using one of the two proposed DCT methods for features extraction are 98.6 %, 99.97 %, 99.90 %, and 93.3 % with 2-fold cross validation, and 98.93 %, 100 %, 99.9 %, and 92.18 % with 5-fold cross validation. The accuracies of GLCM texture features approach for facial gender classification are 98.8 %, 99.6 %, 100 %, and 93.11 %, for AT@T, Faces94, UMIST, and FERET, databases. The accuracies for all databases when using 2D-WT are ranging between 96.18 % and 99.6 % except FERET and its accuracy is 92 %.     

Study of urban spatial patterns from SPOT panchromatic imagery using textural analysis

The long-time historical evolution and recent rapid development of Beijing, China, present before us a unique urban structure. A 10-metre spatial resolution SPOT panchromatic image of Beijing has been studied to capture the spatial patterns of the city. Supervised image classifications were performed using statistical and structural texture features produced from the image. Textural features, including eight texture features from the Grey-Level Co-occurrence Matrix (GLCM) method; a computationally efficient texture feature, the Number of Different Grey-levels (NDG); and a structural texture feature, Edge Density (ED), were evaluated. It was found that generally single texture features performed poorly. Classification accuracy increased with increasing number of texture features until three or four texture features were combined. The more texture features in the combination, the smaller difference between different combinations. The results also show that a lower number of texture features were needed for more homogeneous areas. NDG and ED combined with GLCM texture features produced similar results as the same number of GLCM texture features. Two classification schemes were adopted, stratified classification and non-stratified classification. The best stratified classification result was better than the best non-stratified classification result.     

Liver fibrosis staging using CT image texture analysis and soft computing

Liver biopsy is considered to be the gold standard for analyzing chronic hepatitis and fibrosis; however, it is an invasive and expensive approach, which is also difficult to standardize. Medical imaging techniques such as ultrasonography, computed tomography (CT), and magnetic resonance imaging are non-invasive and helpful methods to interpret liver texture, and may be good alternatives to needle biopsy. Recently, instead of visual inspection of these images, computer-aided image analysis based approaches have become more popular. In this study, a non-invasive, low-cost and relatively accurate method was developed to determine liver fibrosis stage by analyzing some texture features of liver CT images. In this approach, some suitable regions of interests were selected on CT images and a comprehensive set of texture features were obtained from these regions using different methods, such as Gray Level Co-occurrence matrix (GLCM), Laws’ method, Discrete Wavelet Transform (DWT), and Gabor filters. Afterwards, sequential floating forward selection and exhaustive search methods were used in various combinations for the selection of most discriminating features. Finally, those selected texture features were classified using two methods, namely, Support Vector Machines (SVM) and k-nearest neighbors (k-NN). The mean classification accuracy in pairwise group comparisons was approximately 95% for both classification methods using only 5 features. Also, performance of our approach in classifying liver fibrosis stage of subjects in the test set into 7 possible stages was investigated. In this case, both SVM and k-NN methods have returned relatively low classification accuracies. Our pairwise group classification results showed that DWT, Gabor, GLCM, and Laws’ texture features were more successful than the others; as such features extracted from these methods were used in the feature fusion process. Fusing features from these better performing families further improved the classification performance. The results show that our approach can be used as a decision support system in especially pairwise fibrosis stage comparisons.     

融合LBP和GLCM的纹理特征提取方法

为提取有效的特征用于纹理描述和分类,提出一种融合局部二进制模式(LBP)和灰度共生矩阵(GLCM)的纹理特征提取方法。利用旋转不变的LBP算子处理纹理图像,得到LBP图像及其GLCM,采用对比度、相关性、能量和逆差矩描述图像的纹理特征。实验结果表明,与其他方法相比,该方法提取的纹理特征具有更强的纹理鉴别能力,平均分类正确率达到93%。     

Improvement of classification in urban areas by the use of textural features: The case study of Lucknow city,Uttar Pradesh

Investigations have been carried out for digital spectral and textural classification of an Indian urban environment using SPOT images with grey level co-occurrence matrix (GLCM), grey level difference histogram (GLDH), and sum and difference histogram (SADH) approaches. The results indicate that a combination of texture and spectral features significantly improves the classification accuracy compared with classification with pure spectral features only. This improvement is about 9% and 17% for an addition of one and two texture features, respectively. GLDH and SADH give statistically similar results to GLCM, and take less computing time than GLCM. Conventional separability measures like transformed divergence, Bhattacharya distance, etc. are not effective in feature selection when classification is carried out with spectral and texture features. An alternative approach using simple statistics such as average coefficient of variation, skewness, and kurtosis and correlation amongst feature sets has shown greater feature selection potential when a combination of spectral and texture features is used.