基于模糊C均值聚类的多分量彩色图像分割算法

以模糊C均值(FCM)聚类理论为基础,选用符合人眼视觉特性的HSI颜色空间,提出了一种新的多分量彩色图像分割算法。该算法首先结合数据分布特点确定出H分量与I分量的初始聚类中心;然后利用FCM聚类技术对H分量、I分量进行分类处理,以得到不同分量的像素点隶属度;最后,将所得到的不同分量像素点隶属度组织成2维特征,并以此进行模糊聚类图像分割。实验结果表明,该算法可有效提高图像分割效果,其分割结果优于传统FCM聚类图像分割方案。     

基于改进FCM聚类算法的火灾图像分割

研究火灾识别问题,火灾图像分割是火灾特征提取和识别的前提,其分割效果直接影响火灾识别的准确率.针对现有分割方法中存在的经验阈值难以确定和因彩色信息丢失导致分割不准确等问题,为了准确识别火灾图像,提出一种改进的FCM聚类的火灾图像分割方法.方法选用符合人眼视觉特性的HSI颜色空间,根据数据分布特点确定色度分量H和亮度分量Ⅰ的初始聚类中心,分别在直方图特征空间进行模糊聚类处理,并利用像素的空间信息对模糊隶属度函数做了改进,最后在由两分量的模糊隶属度组成的二维特征空间上进行火灾图像分割.实验结果表明,算法可排除高亮区域的干扰,准确分割出火焰区域,为后续的火灾识别提供重要依据.     

基于颜色空间和核函数的FCM图像分割算法

首先在确定模糊聚类的初始聚类数和初始聚类中心方面,引入颜色直方图应用于FCM聚类算法中。其次再将空间信息引入到FCM中,重建包含邻域信息的新的隶属度迭代函数。最后,用内核诱导距离取代原算法中的欧式距离,对实验图像的特征进行优化,并对算法进行评价对比。实验结果表明,该算法具有良好的分割质量和效果,并且也具有较强大的噪声抑制能力。     

结合SSFCM与随机游走的半监督图像分割算法

针对基于颜色特征空间的半监督聚类分割算法适合分割结果包含多个颜色特征相似目标的应用场合,但对高噪声图像却无法获得理想的分割结果,而基于随机游走理论的半监督图像分割算法需要用户对目标逐一进行标记的问题,提出一种半监督图像分割算法.首先根据用户标记采用半监督模糊C均值聚类(SSFCM)算法对图像颜色特征进行建模;然后引入一个确信度函数,并根据SSFCM算法得到的隶属度数据计算确信度函数值,再将像素分为2类,分别作为随机游走图像分割算法的已标记点和未标记点;最后采用随机游走算法完成最终的分割.实验结果表明,该算法对图像中的噪声具有良好的抑制作用,且无需用户对目标逐一进行标记.     

基于模糊C均值聚类的遥感图像分割方法

在遥感图像分割领域,模糊C均值聚类算法得到了广泛的应用。但存在计算量大、易受噪声干扰等缺点。针对以上缺点对快速模糊C均值聚类算法进行了改进。首先利用一维灰度直方图进行快速模糊C均值聚类降低计算量;然后在此基础上根据像素的邻域特性构造新的隶属度函数;最后根据新的隶属度函数对每个像素进行分类。实验结果表明,该算法能快速有效地分割图像,并具有较强的抗噪能力。     

模糊颜色直方图在基于内容的图像检索中的应用研究

本文提出一种子模糊颜色直方图构造方法,采用模糊C 均值聚类算法对彩色图像进行颜色聚类,利用模糊理论的隶属函数,通过计算每个像素对颜色聚类中心的隶属度构造颜色直方图,将得到的模糊颜色直方图作为表示彩色图像的特征向量进行基于内容的图像检索实验,实验结果表明本文提出的方法具有较高的检索准确率和研究价值。     

一种用于套色检测的图像分割新方法

提出一种基于HSI模型直方图以及颜色聚类的套色标记彩色分割方法.该方法将拍摄的RGB彩色图像转换到HSI颜色空间,并以H分量为主要依据,结合S与1分量进行粗分割,获取颜色初始聚类中心.然后对像素点进行颜色聚类,最后采用区域合并修复误分割的区域.实验表明,该方法能在较大范围内准确分割套色标记.     

一种融合聚类与区域生长的彩色图像分割方法

论文提出了一种将聚类和区域生长有机融合的彩色图像分割方法。为了捕获图像的纹理特征,首先将图像划分成16×16子块,然后在块中按照视觉一致性准则进行颜色聚类,对于聚类后的子块,提取其颜色与纹理特征,然后采用符合人类视觉特征的生长规则,进行基于子块的区域生长。该方法充分利用了聚类算法和区域生长算法的各自优点,并符合人类视觉特征的分割策略。利用提出的算法对多幅自然图像进行了分割实验,实验结果证明了算法的有效性。     

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。     

基于模糊隶属度函数的脑图像分割方法

为提高医学图像在组织边界不清晰以及灰度不均匀下的分割性能，提出一种基于多类样本间模糊距离的隶属度函数分割方法。通过磁共振序列测量确定反映磁共振图像脑部组织特性的映射图，经预处理后得到样本模糊标签；设计基于多样本类间模糊距离的隶属度函数确定各样本的隶属度，该隶属度的确定综合考虑了同类样本与不同类样本之间的空间距离，降低了同类样本之间的隶属度依赖；训练模糊支持向量机对三种主要脑组织进行分割。在脑图像公开数据集上的分割实验表明，改进算法可有效提高分割精度。     

Core zone scatterplots: A new approach to feature extraction for visual displays

This paper presents a new scheme for mapping high dimensional data onto two-dimensional viewing spaces. The mapping procedure is carried out in two stages. In the first stage, the fuzzy c-means (FCM) algorithm is applied to the N-dimensional data to find membership functions of clusters in the data. Core subsets are then selected from the original data based upon threshold values applied to the membership functions found by FCM. In the second stage feature vectors in the selected “core” subsets are submitted to various feature extraction mappings, which yield scatterplots of the image points in 2D space. The proposed approach has two significant advantages over many previous schemes. First, changes in the core structure imposed on the original data under feature extraction can be used to gauge the relative quality of competing extraction techniques. And second, the cores provide a way to generalize almost any known method, resulting in new extraction algorithms. We also discuss various ways to color the selected data that enhance the 2D display. Our approach incorporates a means for assessing the “quality” of the 2D display via parameters which provide an evaluation of (i) the validity of clusters in the original data set and (ii) the relative ability of various extraction mappings to preserve certain well-defined structural properties of the original data. The feasibility of our approach is illustrated using two sets of data: the well known Iris data; and a set of flow cytometric data. Color displays are used to visually assess scatterplot configurations in 2-space.     

Granular type-2 membership functions: A new approach to formation of footprint of uncertainty in type-2 fuzzy sets

In this study, a new approach for the formation of type-2 membership functions is introduced. The footprint of uncertainty is formed by using rectangular type-2 fuzzy granules and the resulting membership function is named as granular type-2 membership function. This new approach provides more degrees of freedom and design flexibility in type-2 fuzzy logic systems. Uncertainties on the grades of membership functions can be represented independently for any region in the universe of discourse and free of any functional form. So, the designer could produce nonlinear, discontinuous or hybrid membership functions in granular formation and therefore could model any desired discontinuity and nonlinearity. The effectiveness of the proposed granular type-2 membership functions is firstly demonstrated by simulations done on noise corrupted Mackey–Glass time series prediction. Secondly, flexible design feature of granular type-2 membership functions is illustrated by modeling a nonlinear system having dead zone with uncertain system parameters. The simulation results show that type-2 fuzzy logic systems formed by granular type-2 membership functions have more modeling capabilities than the systems using conventional type-2 membership functions and they are more robust to system parameter changes and noisy inputs.     

基于优化分块颜色直方图及模糊C聚类的彩色图像检索方法

将数据挖掘的聚类算法应用到基于内容的图像检索中可以有效提高检索的速度和效果。模糊聚类算法更符合图像检索本身所具有的模糊性,但这种方法存在聚类分析时间过久影响检索性能的问题,因此本文提出了一种基于优化分块颜色直方图及模糊C聚类的彩色图像检索方法。首先对图像库中的每幅图像进行分块,并提取出每一块的优化颜色特征信息;然后采用模糊C均值聚类算法对得到的颜色特征向量进行聚类,得到每个图像类的聚类中心;最后计算查询示例图像和对应图像类的图像之间的相似度,按照相似度的大小返回检索结果。实验表明,本文提出的方法不仅具有较高的查全率和查准率,而且提取的特征维数较少,聚类时间短,检索速度快。     

Adaptive fuzzy color segmentation with neural network for road detections

In this paper a new color space, called the RGB color ratio space, is proposed and defined according to a reference color such that an image can be transformed from a conventional color space to the RGB color ratio space. Because a color in the RGB color ratio space is represented as three color ratios and intensity, the chrominance can be completely reserved (three color ratios) and the luminance can be de-correlated with the chrominance. Different from traditional distance measurement, a road color model is determined by an ellipse area in the RGB ratio space enclosed by the estimated boundaries. A proposed adaptive fuzzy logic in which fuzzy membership functions are defined according to estimated boundaries is introduced to implement clustering rules. Therefore, each pixel will have its own fuzzy membership function corresponding to its intensity. A basic neural network is trained and used to achieve parameters optimization. The low computation cost of the proposed segmentation method shows the feasibility for real time application. Experimental results for road detection demonstrate the robustness to intensity variation of the proposed approach.     

Fuzzy system reliability evaluation using time-dependent intuitionistic fuzzy set

In general, fuzzy sets are used to analyse the system reliability. In this article, the concept of fuzzy set is extended by the idea of intuitionistic fuzzy set (IFS) and a new general procedure is proposed to construct the membership and non-membership functions of the fuzzy reliability using time-dependent IFS. Here, failure rate function of the system is represented by a triangular intuitionistic fuzzy number (IFN). Also, using proposed approach, membership and non-membership functions of fuzzy reliability of series and parallel systems are constructed, where the failure rate of each component is taken as a time-dependent triangular IFN. The major advantage of using IFS over fuzzy sets is that IFS separate the positive and negative evidences for membership of an element in the set. Numerical examples are given to illustrate the proposed approach.     

Construction of a neuron-fuzzy classification model based on feature-extraction approach

In this paper, a Feature-Extraction Neuron-Fuzzy Classification Model (FENFCM) is proposed that enables the extraction of feature variables and provides the classification results. The proposed classification model synergistically integrates a standard fuzzy inference system and a neural network with supervised learning. The FENFCM automatically generates the fuzzy rules from the numerical data and triangular functions that are used as membership functions both in the feature extraction unit and in the inference unit. To adapt the proposed FENFCM, two modificatory algorithms are applied. First, we utilize Evolutionary Programming (EP) to determine the distribution of fuzzy sets for each feature variable of the feature extraction unit. Second, the Weight Revised Algorithm (WRA) is used to regulate the weight grade of the principal output node of the inference unit. Finally, the proposed FENFCM is validated using two benchmark data sets: the Wine database and the Iris database. Computer simulation results demonstrate that the proposed classification model can provide a sufficiently high classification rate in comparison with that of other models proposed in the literature.     

空间圆几何参数视觉测量方法研究

对空间圆几何参数的非接触在线测量方法进行了研究。通过在区域划分中引入模糊化思想,基于模糊隶属度构建一种神经网络的拓扑结构,采用立体标靶进行摄像机标定。面向局部检测区域小的空间尺寸测量问题,利用图像的梯度相关作为匹配特性,开发一种高效的基于梯度图像的立体匹配算法。在实验研究中,对某车身翼子板安装孔进行了检测,结果显示当空间圆所在平面与图像平面约50°角时,测量空间圆的相对误差优于±0.6%。研究结果表明,提出的方法测量精度高,并适用于在线测量。     

一种新的文物图像检索方法

针对大学数字博物馆数据库中文物图像的特点,提出了一种新的文物图像检索方法。特征提取采用基于分块图像建立模糊颜色直方图;模糊颜色直方图的建立不仅考虑了不同颜色索引像素之间的差异,也考虑了同一颜色索引像素间的差异;图像分块策略结合了文物图像的颜色特征与形状特征。一种新的图像相似性度量方法---交互信息距离(MID)用来进行相似性匹配。参数AVRR/IAVRR用来进行检索性能评价,评价结果表明,本文的方法在文物图像检索中具有较高的检索准确率。     

Quadratic-Stability Analysis of Fuzzy-Model-Based Control Systems Using Staircase Membership Functions

This paper presents the stability analysis of fuzzy-model-based (FMB) control systems. Staircase membership functions are introduced to facilitate the stability analysis. Through the staircase membership functions approximating those of the fuzzy model and fuzzy controller, the information of the membership functions can be brought into the stability analysis. Based on the Lyapunov-stability theory, stability conditions in terms of linear-matrix inequalities (LMIs) are derived in a simple and easy-to-understand manner to guarantee the system stability. The proposed stability-analysis approach offers a nice property that includes the membership functions of both fuzzy model and fuzzy controller in the LMI-based stability conditions for a dedicated FMB control system. Furthermore, the proposed stability-analysis approach can be applied to the FMB control systems of which the membership functions of both fuzzy model and fuzzy controller are not necessarily the same. Greater design flexibility is allowed to choose the membership functions during the design of fuzzy controllers. By employing membership functions with simple structure, it is possible to lower the structural complexity and the implementation cost. Simulation examples are given to illustrate the merits of the proposed approach.      

RGB空间下基于C-means颜色聚类的印花布图像分割方法研究

针对印花瑕疵检测的关键技术问题,主要围绕颜色度量和彩色图像分割两个方面展开研究工作。提出一种新的颜色度量公式,实现直接利用聚类分析算法在RGB颜色空间中对图像进行分割。同时还提出一种基于距离修正的模糊C均值聚类算法,提高了算法的抗噪声性能。实验研究结果表明,所提出的算法能成功有效地对印花图像的颜色特征进行提取与分割,并且抗噪声性能也比较强。