一种综合颜色和纹理特征的图像检索算法

对图像颜色特征和纹理特征进行了研究。在图像颜色特征方面,利用人类的视觉特性,对图像不同分块的主色进行确认和加权处理,获得加权主色颜色特征;在纹理特征方面,利用统计法和结构法构造灰度-差分基元共生矩阵来提取纹理特征。在此基础上,通过高斯归一化方法将颜色特征和纹理特征进行综合,形成最后的图像检索特征,并给出了利用该特征的图像检索算法。实验结果表明,所提出的灰度-差分基元共生矩阵特征提取较传统的灰度共生矩阵特征更加精细,在此基础上综合利用颜色和纹理特征的图像检索方法具有更好的检索精度。     

基于支持向量机的语义图像分类研究

随着多媒体数据库的不断发展,传统的利用关键词进行图像检索已经越来越不能满足图像检索的需要,基于内容的图像检索已成为当前的研究热点。对图像的颜色和纹理特征进行提取,融合图像的颜色和纹理特征作为图像的特征向量,用支持向量机实现图像的低层特征和高级语义间的关联。实验结果表明,多特征的图像检索要比单一的特征检索效果好,在HSV颜色特征的基础上引入灰度共生矩阵纹理特征后可有效提高检索效率,而且采用支持向量机融合多特征可成功用于图像的语义的检索。     

基于支持向量机的语义图像分类研究

随着多媒体数据库的不断发展,传统的利用关键词进行图像检索已经越来越不能满足图像检索的需要,基于内容的图像检索已成为当前的研究热点。对图像的颜色和纹理特征进行提取,融合图像的颜色和纹理特征作为图像的特征向量,用支持向量机实现图像的低层特征和高级语义间的关联。实验结果表明,多特征的图像检索要比单一的特征检索效果好,在HSV颜色特征的基础上引入灰度共生矩阵纹理特征后可有效提高检索效率,而且采用支持向量机融合多特征可成功用于图像的语义的检索。     

主颜色特征与纹理相结合的图像检索

在图像检索中,颜色是各种特征中最直观的视觉特征,两幅布局结构不同的图像形成的颜色直方图却有可能很相似,为了避免该缺陷,文中采用颜色特征与纹理相结合的检索技术进行图像检索,并通过综合实验来验证文中检索方法的优势。     

铜导线断裂痕迹形态的图像特征提取与分析

纹理是断口的重要特征,不同的断裂原因造成断口的纹理特征是不一样的,它提示了图像中亮度值空闻变化的重要信息。图像宏观上表现出来的是二雏特性,可以将其灰度变化看成是图像的第三维特征来进行研究,这个“第三维”的表现可以用图像的能量或者所舍信息量来表示。常用的图像纹理特征提取的方法有：统计法、利用空间自相关函数作纹理测度、频谱法、联合概率矩阵法、纹理的句法结构分析法。本文主要从频谱法和灰度共生矩阵法两个方面对4种不同原因造成的铜导线断口图像做纹理特征的提取与分析。     

基于灰度共生矩阵的火焰图像纹理特征分析

早期火灾是从无到有的发生发展过程,在这一过程中,火焰的纹理特征也会随之产生快速上升或下降,并出现大幅度抖动的现象.本文采用灰度共生矩阵分析法和MATLAB仿真工具,综合分析火焰以及台灯、目光灯、晃动的蜡烛等干扰物在能量、熵、惯性矩和局部平稳性四个主要方面的纹理特征,得到干扰物纹理特征与火焰纹理特征变化规律的异同,为进一步使用神经网络进行火灾图像探测时纹理特征参数判据的确定提供依据.     

基于区域特征分析的快速FCM图像分割改进算法

提出一种基于图像区域特征估计聚类数的快速FCM图像分割算法。在算法的预测分析阶段, 利用由共生矩阵统计值所构成的特征矢量描述图像中区域特征并结合多个聚类有效性判定函数实现准确的聚类数估计和隶属度矩阵值的初始化。在主聚类阶段,采用Gabor滤波器提取的颜色纹理隐式混合特征进行聚类,不但能获得更加合理的区域分割质量,同时也具有较好的抗噪声能力。实验表明改进算法有效克服基于像素点级特征的FCM图像分割算法在聚类数估计和隶属度矩阵初始化方面的不足,加快FCM主聚类阶段的迭代速度,执行效率更高。     

基于共生矩阵的SAR图像村庄识别方法

针对SAR图像中村庄目标的纹理和结构特点,提出了一种纹理特征分析和基于村庄结构知识的后处理方法相结合的识别方法.在共生矩阵提取出图像纹理特征的基础上,通过实验选取三个合适的特征,计算特征矢量和样本中心距离来判决目标,以完成初步提取.然后针对道路,植被等目标造成的干扰状况,提出了一种基于计数滤波器和形态学方法的后处理方法对结果进行归整,消除大量虚警.最后根据村庄的结构知识约束,筛选目标,进一步减小虚警率,完成识别并提取出村庄的边缘轮廓结构.实验表明,该方法具有良好的识别效果.     

基于可分离性判据的自适应加权纹理图像分割*

进行自适应加权,以提高可分离性好的特征在分类中所起的作用,使加权后的特征具有更好的分类效果。实验表明,该方法的分割结果比未加权的效果要好。     

A clustering method based on multidimensional texture analysis

Considering the analogy between image segmentation and cluster analysis, the aim of this paper is to adapt statistical texture measures to describe the spatial distribution of multidimensional observations. The main idea is to consider the cluster cores as domains characterized by their specific textures in the data space. The distribution of the data points is first described as a multidimensional histogram defined on a multidimensional regular array of sampling points. In order to evaluate locally a multidimensional texture, a co-occurrence matrix is introduced, which characterizes the local distribution of the data points in the multidimensional data space. Several local texture features can be computed from this co-occurrence matrix, which accumulates spatial and statistical information on the data distribution in the neighborhoods of the sampling points. Texture features are selected according to their ability to discriminate different distributions of data points. The sampling points where the local underlying texture is evaluated are categorized into different texture classes. The points assigned to these classes tend to form connected components in the data space, which are considered as the cores of the clusters.     

An effective method for color image retrieval based on texture

This paper presents an effective color image retrieval method based on texture, which uses the color co-occurrence matrix to extract the texture feature and measure the similarity of two color images. Due to the color information such as components and distribution is also taken into consideration, the feature obtained not only reflects the texture correlation but also represents the color information. As a result, our proposed method is superior to the gray-level co-occurrence matrix method and color histogram method, and it enhances the retrieval accuracy which is measured in terms of the recall and precision in the meanwhile.     

基于灰度共生矩阵的图像纹理特征提取分析

图像纹理作为一种重要的视觉手段,是图像中普遍存在而又难以描述的特征。目前常用的纹理特征提取的方法主要有统计方法、模型方法、信号处理方法和结构方法。灰度共生矩阵即为灰度级的空间相关矩阵,以其为基础的统计方法通过对矩阵统计量的求取较好地提取到了纹理特征,通过选取关键参数编程并进行仿真实现,分别求取了四个方向的灰度共生矩阵及其特征量来分析图像的纹理特征。     

基于颜色和纹理特征的大理石分类

提出了一种利用颜色和纹理特征进行大理石分类的方法,单一利用一种特征进行分类的效果并不理想,而综合利用和纹理特征进行分类取得了满意效果。     

Study of image retrieval and classification based on adaptive features using genetic algorithm feature selection

This paper proposes a genetic algorithm feature selection (GAFS) for image retrieval systems and image classification. Two texture features of adaptive motifs co-occurrence matrix (AMCOM) and gradient histogram for adaptive motifs (GHAM) and color feature of an adaptive color histogram for K-means (ACH) were used in this paper. In this paper, the feature selections have adopted sequential forward selection (SFS), sequential backward selection (SBS), and genetic algorithms feature selection (GAFS). Image retrieval and classification performance mainly build from three features: ACH, AMCOM and GHAM, where the classification system is used for two-class SVM classification. In the experimental results, we can find that all the methods regarding feature extraction mentioned in this study can contribute to better results with regard to image retrieval and image classification. The GAFS can provide a more robust solution at the expense of increased computational effort. By applying GAFS to image retrieval systems, not only could the number of features be effectively reduced, but higher image retrieval accuracy is elicited.