一种遥感图象的混合多尺度Hurst参数分类模型  

A Mixed Multiscale Hurst Parameter Classification Model of Remote Sensing Image

作　　者：李艳[1] 彭嘉雄[1] 

机构地区：[1]华中理工大学图象识别与人工智能研究所图象信息处理与智能控制教育部重点实验室,武汉430074

出　　处：《中国图象图形学报（A辑）》2001年第6期537-541,共5页Journal of Image and Graphics

基　　金：<测绘遥感信息工程>国家重点实验室资助课题 (WKL (99) 0 10 3)

摘　　要：针对遥感图象分类较困难的问题 ,提出了一个遥感图象的分类模型——扩展的自相似模型 (ESS) ,该模型是一种广义的分形布朗模型 (f Bm ) ,它的多尺度 Hurst参数与粗糙度之间是对应的 ,同时不必像分形维数那样要求粗糙度的尺度不变性 ,因而比 f Bm更接近于实际情况 .另外 ,由于它的参数可以作为很好的分类特征 ,而且特征维数低、计算快 ,其方向性 Hurst参数还描述了纹理在 4个方向上的粗糙度 ,因此可将它们与灰度的均值和标准差一起作为一组特征 ,来构造一个混合多尺度 Hurst参数分类模型 ,将其用于卫星遥感图象分类 。A classification model for remote sensing imaging is presented. The Extended self similar model(ESS)is a general fractional Brownian motion(fBm) model. Its multiscale Hurst parameters have relations with roughness. At the meantime, it doesn't require the roughness to be scale\|invariant as fractal dimensions do. The ESS is closer to the realities than fBm. Moreover, ESS gives multiscale parameters to provide more accurate interpretation of textures while the fBH gives only one. The multiscale Hurst parameters can discriminate a large number of natural textures and are suitable to be the features for texture classification. These features' dimension is lower compared with many other texture features, so that the computation intensity is less. Directed Hurst parameters describe the roughness at four orientations and multiscales. In this study they are mixed with the mean and standard deviation of gray level to be the feature vector. A new classification model of mixed multiscale Hurst parameters is constructed based on Bayes theorem. In this model we suppose that the conditional possibility distribution function of each feature is Gaussian, and the features are independent with each other. The a priori possibilities are decided by the highest rate of correct classification of the training set. For remote sensing texture classification, the performance of the new model is compared to other features, such as co occurrence matrix features and Kaplan's features, etc. These classification algorithms are all based on Bayes theorem and the assumption that the a priori possibilities of all the classes are equal. Our experiments show that higher rate of correct classification to SPOT image is obtained by this new model.

关 键 词：纹理分类 HURST参数 自相似模型 分形布朗运动 遥感图象 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]