Two-Step Sparse Decomposition for SAR Image Despeckling
Two-Step Sparse Decomposition for SAR Image Despeckling
复制标题
SAR 图像去斑的两步稀疏分解
DOI:
10.1109/lgrs.2017.2705030
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发表时间:
2017-06
影响因子:
4.8
通讯作者:
Hong Sun
中科院分区:
文献类型:
--
作者:
Cheng-Wei Sang;Hong Sun
In this letter, we propose a new despeckling method based on two-step sparse decomposition. First, the grouping by block matching method identifies similar image patches and stacks them into a group, so that the group of similar patches are mostly homogeneous, which is suitable for the followed sparse decomposition method. And then, the proposed two-step sparse decompositions are applied to each group. The first sparse decomposition is a classical sparse representation to obtain an overcomplete dictionary and the sparse coefficients. The second sparse decomposition is a subspace decomposition over the dictionary. We proposed a measurement from the sparse coefficients as the criterion to identify a principal signal subdictionary. Finally, the image is reconstructed by the linear combination of the atoms of the principal subdictionary. The proposed method takes benefits from learned overcomplete dictionary, which fully explores details and from the principal subdictionary, which reduces strong noises. Experimental results demonstrate the efficiency of the proposed method to denoise synthetic aperture radar images. Our method can achieve high performances in terms of both structure details preservation and speckle noise reduction.
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DOI:
10.1109/tgrs.2011.2161586
发表时间:
2012-02-01
影响因子:
8.2
作者:
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DOI:
10.1016/j.sigpro.2011.12.015
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Signal Process.
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发表时间:
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影响因子:
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影响因子:
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DOI:
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发表时间:
2008-07
期刊:
IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium
影响因子:
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作者:
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