基于區(qū)域劃分的極化SAR圖像分類方法研究
[Abstract]:Polarimetric synthetic Aperture Radar (Polarimetric Synthetic Aperture Radar,POLSAR) polarization has attracted much attention due to its ability to obtain data from multiple polarimetric channels, which is more abundant than that of ordinary SAR. Polarized SAR has important prospects in both military and civil fields. The identification of targets by polarized SAR can effectively help the troops to focus on the important positions of the enemy in the war. Moreover, polarized SAR data provide data basis for geological hazard detection and assessment, sea ice thickness detection, forest fire detection and so on. At present, the research on the application of polarized SAR is a hot spot. It is of great significance to make full use of polarized SAR data to obtain information. As an important part of polarimetric SAR image interpretation, polarimetric SAR image classification has also been paid attention to in the field of international remote sensing, and has become an important research direction. 1. A polarimetric SAR image classification method based on nearest neighbor propagation clustering and regional growth is proposed in this paper. The algorithm is mainly based on feature extraction and watershed algorithm to get the results of region over-segmentation, and then the region based K-means algorithm is used to divide the initial region to reduce the number of over-segmented regions. Then the region based nearest neighbor propagation clustering is used to classify the image, and the spatial correlation of the image is fully considered, and the region growth method is used to improve the classification accuracy. Finally, the classification results are obtained by the Wishart classification of the boundary points. By using the homogeneous region obtained by over-segmentation as the classification unit, the effect of speckle in polarimetric data is effectively reduced and the classification accuracy is improved by 2.2. In this paper, an improved watershed based region division method is proposed. The over-segmented region obtained from the watershed is taken as the analysis unit, the spatial information of the region is fully utilized, the adjacent information of each region is obtained, and the combined evaluation value of the adjacent region is calculated by combining with the edge punishment. Merging each other is the most suitable adjacent region for merging, and obtains the result of regional division, which greatly reduces the number of over-segmented regions and effectively combines the adjacent regions with the same features in homogeneous regions. And the edge of the region remains good. 3. In this paper, an unsupervised polarimetric SAR image classification method based on region partition is proposed. Through a new method of polarization feature extraction and edge strength calculation, the watershed algorithm is used to obtain the over-segmentation results, and then the improved watershed based region partition method is used to divide the over-segmented small area into larger regions. Finally, the region based nearest neighbor propagation clustering and a Wishart classifier considering spatial correlation are used to classify, and the final classification results are obtained. The classification method can get better classification results.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN957.52
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