基于局部與非局部策略的極化SAR相干斑抑制研究
[Abstract]:Polarimetric synthetic Aperture Radar (POLSAR) is a kind of multi-parameter, multi-channel microwave imaging radar, which can project objects to a certain extent, and can obtain scattering echo of the target in different polarization state, and describe the information contained in the target better. It has become a new technology in the field of remote sensing and a new trend in the development of synthetic Aperture Radar (SAR), which has been widely used in military, national defense, environment, agriculture and other fields. However, due to the principle defects of coherent imaging, there is a certain deviation between the target information obtained by polarized SAR system and the actual information, which leads to speckle noise in polarized SAR data, which seriously affects the interpretation and subsequent application of the data. Therefore, the suppression of speckle noise becomes the most important problem in the application of polarimetric SAR data. In this paper, the statistical distribution and speckle noise model of SAR data and polarized SAR data are introduced, and three speckle suppression algorithms are proposed. The main contents are as follows: 1. Based on the bilateral filtering of polarimetric SAR data and the relative total variation, an edge detection algorithm based on edge detection and two-sided filtering is proposed for polarimetric SAR speckle suppression. The homogeneous region and the edge texture detail area of the image are detected, and different values of the brightness information smoothing parameters of the bilateral filtering are set in different regions to make it more suitable for the processed pixels. The algorithm is simple and fast and can directly process the polarization covariance matrix C or the polarized coherence matrix T. Experimental results show that the proposed algorithm not only has relatively good performance for speckle noise suppression, but also maintains the edge texture details relatively well. 2. A polarimetric SAR speckle suppression algorithm based on non-local two-sided filtering and non-local mean filtering is proposed, which selects as many similar image blocks as possible. These similar image blocks are filtered by two sides. Finally, the results of the similar image blocks are weighted by non-local weighted averaging. The structural similarity of the image blocks and the pixel similarity of the single pixel are taken into account in both the structural similarity of the image blocks and the pixel similarity of the single pixel. This algorithm combines local and non-local strategies, not only considering the advantages of bilateral filtering, but also considering the advantages of non-local mean filtering. The experimental results show that the proposed algorithm has better speckle suppression effect on polarized SAR images both in homogeneous region and in edge texture detail region. The SVD algorithm with additive Gao Si white noise image is applied to speckle suppression of SAR data. Aiming at the statistical distribution of SAR data and the speckle noise model, In obtaining the SVD sample matrix, the Euclidean distance is replaced by the similarity distance suitable for SAR data, and a formula for calculating the threshold parameters of SVD for speckle noise of SAR data is proposed. In addition, considering the characteristics of polarized SAR data, the SVD method applied to speckle suppression of SAR data is extended to polarimetric SAR data to obtain similar image blocks and SVD threshold parameters on Span data. In maintaining polarization information has a certain role. Experimental results show that the proposed algorithm can achieve better performance in both SAR data and polarimetric SAR data, and its greater advantage lies in its effectiveness in single-view polarimetric SAR data processing. This paper is supported by the National Natural Science Foundation (No.61173092), the New Century Talent support Program (No.66ZY110) and the Shaanxi Province Scientific and technological Research and Development Program (No.2013KJXX-64).
【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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