Unsupervised Change Detection in Multitemporal SAR Images Using MRF Models     

JIANG Liming LIAO Mingsheng ZHANG Lu LIN Hui 《地球空间信息科学学报》2007,10(2):111-116

An unsupervised change-detection method that considers the spatial contextual information in a log-ratio difference image generated from multitemporal SAR images is proposed. A Markov random filed (MRF) model is particularly employed to exploit statistical spatial correlation of intensity levels among neighboring pixels. Under the assumption of the independency of pixels and mixed Gaussian distribution in the log-ratio difference image, a stochastic and iterative EM-MPM change-detection algorithm based on an MRF model is developed. The EM-MPM algorithm is based on a maximiser of posterior marginals (MPM) algorithm for image segmentation and an expectation-maximum (EM) algorithm for parameter estimation in a completely automatic way. The experiment results obtained on multitemporal ERS-2 SAR images show the effectiveness of the proposed method.  相似文献   

WorldView-1卫星图像在康定县地质灾害中的应用     

刘小霞 《四川地质学报》2012,32(1):110-111

利用worldview-1遥感数据对康定县城周边地质灾害进行了解译调查、分析新旧县城周边地质灾害的分布,应用成果为地质灾害的防治提供了基础资料。  相似文献