湿地遥感图像分割算法设计及实现

提出了一种结合熵和模糊C均值的聚类分割方法。模糊C均值（FCM）聚类算法广泛用于图像的自动分割,但是传统的FCM算法没有考虑像素的空间信息,因而对噪声十分敏感,基于二维直方图的模糊C均值聚类算法除了考虑像素点的灰度信息外还考虑了像素点邻域的空间信息,可有效地抑制噪声;在目标函数中引入熵项则能更好地抑制噪声和外围点对类中心估计的影响。实验分析结果表明,算法对湿地遥感图像的分割效果优于FCM算法。     

一种基于自适应空间信息改进FCM的图像分割算法

为了更好地改善图像分割效果,提出一种自适应空间信息的模糊聚类算法(adaptive spatial information fuzzy clustering,ASIFC).算法将图像空间信息与FCM算法相结合,改进了FCM算法的目标函数;使用信息最大化识别噪声数据和消除异常值.在合成图像和核磁共振脑部图像数据库Brainweb上的实验结果表明,该算法能自适应地实现图像分割,有效识别噪声数据,解决了FCM的空间信息缺乏问题,增强了算法的鲁棒性,相比其他几种较新的聚类算法,取得了更好的分割效果.     

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.     

基于空间信息的可能性模糊C均值聚类遥感图像分割

可能性模糊C均值(PFCM)聚类算法作为模糊C均值(FCM)聚类算法的一种改进算法,能在一定程度上克服FCM算法对噪声的敏感性;但由于PFCM没有考虑像元间的空间信息,对含有较大噪声的图像分割效果依然不理想。为此,提出一种新的基于空间信息的PFCM算法(SPFCM),克服了PFCM算法对含有较大噪声的图像分割效果不佳的缺点。通过对人工图像和IKONOS遥感图像进行分析,结果表明,SPFCM算法无论是在视觉上还是在分割正确率上都优于传统的FCM算法、PFCM算法及两种加入空间信息的FCM算法;对于含有高斯噪声和盐椒噪声的图像,平均分割正确率高达99.71%,是一种去噪效果较好的图像分割算法。     

基于多目标规划的模糊C均值聚类算法

模糊C均值聚类算法(FCM)是一种非常经典的非监督聚类技术,已被广泛地应用到医学图像分割。由于传统的FCM聚类算法在分割图像时仅利用了图像的灰度信息,未利用图像的空间信息,在分割叠加了噪声的磁共振(MR)图像时分割效果不理想。考虑到脑部MR图像真实的灰度值具有分片为常数的特性,按照合理利用图像空间信息的原则,对传统的FCM聚类算法进行了改进,引入多目标规划的概念,提出了一种新的,更加合理的应用图像空间信息的聚类算法。实验结果表明,应用该算法可以有效地分割含有噪声的图像。     

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。     

基于改进模糊C均值聚类的光伏面板红外图像分割

红外图像具有对比度低和信噪比低等特点,这对红外光伏面板图像的分割始终是一个巨大的挑战.为了解决传统的模糊C均值（FCM）聚类算法易受到初始聚类中心不确定的影响和不考虑空间信息的问题,提出了一种基于模糊C均值改进的聚类分割算法,该算法利用直方图的特点确定初始聚类中心,同时在传统的模糊C均值（FCM）和模糊核C均值算法（KFCM）的基础上,利用像素之间的空间信息和邻域像素之间的关系改进传统FCM聚类目标函数,从而推导出新的目标函数.实验结果表明,该算法在分割质量和效果上与Otsu算法、文献[20]的自适应k-means算法及模糊核C均值算法（KFCM）相比,过分割和错分割率明显降低,且分割效果非常接近手动分割图.     

基于SSCL的模糊C均值图像分类方法

针对传统模糊C均值聚类方法对噪声敏感和过分依赖于初始聚类中心的缺点,提出基于SSCL的模糊C均值图像分类的自适应算法。该算法首先通过SSCL获得初始类别数和类别中心,然后作为模糊C均值聚类的输入,自动对图像进行分割,并对图像分割结果利用空间信息进行后处理。实验结果表明该方法较好地解决了FCM算法中的初始化和噪声敏感问题,具有较好的分类结果。     

基于FCM聚类的图像分割算法

为提高现有模糊C均值聚类算法(FCM)对噪声图像分割的效果和稳定性,提出一种基于FCM的图像分割算法。利用非局部空间信息构建和图像,根据和图像的直方图,自动选择初始化聚类中心,通过求取目标函数极小值完成图像分割。理论分析和实验结果表明,该算法比现有算法更加有效和稳定,对噪声图像有更强的鲁棒性。     

结合改进FCM算法的多相位CV模型

Chan-Vese模型以其能较好地处理图像的模糊边界和复杂拓扑结构而广泛运用于图像分割中。但对于灰度不均匀性和多目标的分割效果较差。模糊聚类（FCM）算法作为一种无监督聚类算法已成功应用到目标识别和图像分割等领域。然而FCM算法没有考虑像素的空间信息对噪声敏感。针对这些问题,提出一种结合改进FCM算法的多相位CV模型。首先,基于直方图统计灰度种类、并利用邻域内计算的空间信息修正隶属度函数,这样克服了灰度不均匀性和噪声的影响。再将改进后的FCM算法应用到CV模型的区域检测项,可较准确地使像素点归类,以此作为曲线的演化依据。在演化时采用一种各项异性的模板来控制轮廓线的及时分裂,在较短时间内分割出更多目标。     

SOM and fuzzy based color image segmentation

Spatial information enhances the quality of clustering which is not utilized in the conventional FCM. Normally fuzzy c-mean (FCM) algorithm is not used for color image segmentation and also it is not robust against noise. In this paper, we presented a modified version of fuzzy c-means (FCM) algorithm that incorporates spatial information into the membership function for clustering of color images A progressive technique based on SOM is used to automatically find the number of optimal clusters. The results show that our technique outperforms state-of-the art methods.     

A multiobjective spatial fuzzy clustering algorithm for image segmentation

This article describes a multiobjective spatial fuzzy clustering algorithm for image segmentation. To obtain satisfactory segmentation performance for noisy images, the proposed method introduces the non-local spatial information derived from the image into fitness functions which respectively consider the global fuzzy compactness and fuzzy separation among the clusters. After producing the set of non-dominated solutions, the final clustering solution is chosen by a cluster validity index utilizing the non-local spatial information. Moreover, to automatically evolve the number of clusters in the proposed method, a real-coded variable string length technique is used to encode the cluster centers in the chromosomes. The proposed method is applied to synthetic and real images contaminated by noise and compared with k-means, fuzzy c-means, two fuzzy c-means clustering algorithms with spatial information and a multiobjective variable string length genetic fuzzy clustering algorithm. The experimental results show that the proposed method behaves well in evolving the number of clusters and obtaining satisfactory performance on noisy image segmentation.     

Optimal-selection-based suppressed fuzzy c-means clustering algorithm with self-tuning non local spatial information for image segmentation

Suppressed fuzzy c-means clustering algorithm (S-FCM) is one of the most effective fuzzy clustering algorithms. Even if S-FCM has some advantages, some problems exist. First, it is unreasonable to compulsively modify the membership degree values for all the data points in each iteration step of S-FCM. Furthermore, duo to only utilizing the spatial information derived from the pixel’s neighborhood window to guide the process of image segmentation, S-FCM cannot obtain satisfactory segmentation results on images heavily corrupted by noise. This paper proposes an optimal-selection-based suppressed fuzzy c-means clustering algorithm with self-tuning non local spatial information for image segmentation to solve the above drawbacks of S-FCM. Firstly, an optimal-selection-based suppressed strategy is presented to modify the membership degree values for data points. In detail, during each iteration step, all the data points are ranked based on their biggest membership degree values, and then the membership degree values of the top r ranked data points are modified while the membership degree values of the other data points are not changed. In this paper, the parameter r is determined by the golden section method. Secondly, a novel gray level histogram is constructed by using the self-tuning non local spatial information for each pixel, and then fuzzy c-means clustering algorithm with the optimal-selection-based suppressed strategy is executed on this histogram. The self-tuning non local spatial information of a pixel is derived from the pixels with a similar neighborhood configuration to the given pixel and can preserve more information of the image than the spatial information derived from the pixel’s neighborhood window. This method is applied to Berkeley and other real images heavily contaminated by noise. The image segmentation experiments demonstrate the superiority of the proposed method over other fuzzy algorithms.     

彩色地图分色算法的改进及实现

在加权模糊c-均值（FCM）聚类算法的基础上,对分色算法进行了改进．首先进行色彩空间模型转换,然后对基于样本加权的FCM算法进行改进,对隶属度进行调整,把二维彩色直方图引入加权系数中．对于模糊c-均值算法,当隶属度接近时,分类会变得模糊,而且对于不同的样本矢量,聚类效果有所不同,本算法兼顾到了这两点．该方法已用Visual C＋＋6．0编程实现,效果比较理想．     

DCT子空间的邻域加权模糊C均值聚类算法

模糊C均值聚类是一种有效的图像分割方法, 但存在因忽略空间上下文信息和结构信息而易为噪声所干扰的现象. 为此提出了DCT子空间的邻域加权模糊C均值聚类方法. 该方法首先结合分块的思想, 对图像块进行离散余弦变换(discrete cosine transform,DCT), 建立了一个基于图像块局部信息的相似性度量模型; 然后定义目标函数中的欧式距离为邻域加权距离; 最后将该方法应用于加噪的人工合成图像、自然图像和MR图像. 实验结果表明, 该方法能够获得较好的分割效果, 同时具有较强的抗噪性.     

基于模糊C均值聚类的比色传感器阵列图像分割算法

结合当前比色传感器阵列多样性、不稳定等特点,并针对当前现有的阵列图像分割算法中或者效率低,或者易受光照环境影响等现状,本文在模糊C均值聚类算法基础上,提出了一种图像分割算法.该算法首先通过HSI颜色空间下I分量在行、列投影实现图像网格划分,并结合局部阵列点图像的平滑直方图信息解决了FCM算法聚类条件初始化的难题.其次,为了提高阵列点图像分割结果的准确度,该算法通过目标函数引入了不同权重系数的H分量和I分量,实现了色彩信息的引入.通过图像分割效果测试,本文所提出的图像分割算法在所有阵列点图像分割中展示了96.54%的总体最优分割精度,可以有效、准确地实现比色传感器阵列图像的目标提取.     

A fast and robust image segmentation using FCM with spatial information

Automated segmentation of images has been considered an important intermediate processing task to extract semantic meaning from pixels. In general, the fuzzy c-means approach (FCM) is highly effective for image segmentation. But for the conventional FCM image segmentation algorithm, cluster assignment is based solely on the distribution of pixel attributes in the feature space, and the spatial distribution of pixels in an image is not taken into consideration. In this paper, we present a novel FCM image segmentation scheme by utilizing local contextual information and the high inter-pixel correlation inherent. Firstly, a local spatial similarity measure model is established, and the initial clustering center and initial membership are determined adaptively based on local spatial similarity measure model. Secondly, the fuzzy membership function is modified according to the high inter-pixel correlation inherent. Finally, the image is segmented by using the modified FCM algorithm. Experimental results showed the proposed method achieves competitive segmentation results compared to other FCM-based methods, and is in general faster.     

结合特定理论工具的彩色图像分割技术

由于彩色图像提供了比灰度图像更为丰富的信息,因此彩色图像处理正受到人们越来越多的关注。彩色图像分割是彩色图像处理的重要问题,目前对彩色图像的分割已提出了许多种算法。对近年来通过结合模糊技术、马尔可夫随机场、神经网络、遗传算法、小波变换等特定理论工具和模型的彩色图像分割方法和策略加以介绍。     

一种稳健的足球机器人目标识别算法

视觉系统是类人足球机器人获取环境信息的主要途径。在比赛中,受场地光照等比赛环境的影响,用传统的分割识别算法难以达到满意的效果。文中提出一种结合目标颜色和形状信息的识别算法。该算法在HSI空间执行基于颜色信息的快速阀值分割,获取目标像素,并且加入了自适应阀值更新,然后利用目标像素和目标形状信息执行优化边缘检测识别目标,最终获得目标在图像中准确的位置信息。实验证明：该算法能长时间在不同光照条件下稳定获取对象在图像中的位置信息,满足实时性的要求。     

Kernel generalized fuzzy c-means clustering with spatial information for image segmentation

The generalized fuzzy c-means clustering algorithm with improved fuzzy partition (GFCM) is a novel modified version of the fuzzy c-means clustering algorithm (FCM). GFCM under appropriate parameters can converge more rapidly than FCM. However, it is found that GFCM is sensitive to noise in gray images. In order to overcome GFCM?s sensitivity to noise in the image, a kernel version of GFCM with spatial information is proposed. In this method, first a term about the spatial constraints derived from the image is introduced into the objective function of GFCM, and then the kernel induced distance is adopted to substitute the Euclidean distance in the new objective function. Experimental results show that the proposed method behaves well in segmentation performance and convergence speed for gray images corrupted by noise.