Multi-variate optimal speckle reduction in SAR imagery

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Abstract. This paper addresses a speckle reduction method of coregistered SAR images based on pixel-to-pixel summation. The sample intensity summation technique (incoherent summation) is well known and is successfully applied to obtain multi-look data. It is shown that the speckle reduction obtained by such a summation depends on the speckle correlation across all the channels. On the contrary, a coherent summation performed by the Whitening Filter leads to an optimal speckle reduction. A comprehensive review of multi-channel summations is presented, followed by practical results obtained from multi-temporal SAR ERS-1 images.

Document Type: Research Article


Publication date: February 1, 1997

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