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Fully-polarized synthetic aperture radar image speckle noise filtering method

A synthetic aperture radar, speckle noise technology, used in radio wave measurement systems, reflection/re-radiation of radio waves, utilization of re-radiation, etc.

Active Publication Date: 2017-03-08
NAT SPACE SCI CENT CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a noise reduction method that can maintain the polarization scattering mechanism and accurately maintain the edge information for the above-mentioned problems existing in the speckle noise filtering method of the current full-polarization synthetic aperture radar image

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  • Fully-polarized synthetic aperture radar image speckle noise filtering method
  • Fully-polarized synthetic aperture radar image speckle noise filtering method
  • Fully-polarized synthetic aperture radar image speckle noise filtering method

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and actual full-polarization synthetic aperture radar data.

[0041] The full polarization SAR image speckle noise filtering method of the present invention uses the polarization scattering similarity parameter and the power similarity parameter respectively to ensure that the polarization scattering mechanism and edge information of the filtered point are not destroyed.

[0042] Such as figure 1 Shown, a kind of filtering method of the speckle noise of full polarization synthetic aperture radar image, described method comprises:

[0043] Step 1) obtain the autocorrelation matrix T of each point of the fully polarized SAR image;

[0044] If the original data is in the form of the scattering matrix S, it needs to be transformed into the scattering vector under the Pauli basis first, and then the data in the form of the autocorrelation matrix T is obtained. The scattering...

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Abstract

The invention discloses a fully-polarized synthetic aperture radar image speckle noise filtering method. The method comprises the following steps: (1) getting an autocorrelation matrix T of each point of a fully-polarized synthetic aperture radar image; (2) setting a sliding window for the image; (3) respectively calculating the polarization scattering similarity parameter and power similarity parameter of the center point of the image and the other points in the sliding window; (4) respectively determining thresholds alpha 1 and alpha 2 corresponding to the two parameters, and selecting points which meet the condition that the polarization scattering similarity parameter r1 is greater than the threshold alpha 1 and the condition that the power similarity parameter r2 is greater than the threshold alpha 2 from the sliding window; and (5) performing filtering with a minimum mean square error filter based on the points selected in step (4) to get an autocorrelation matrix T-hat of the center point after filtering. The method of the invention can ensure that the polarization scattering property of the center point after filtering is not damaged and edge information can be retained.

Description

technical field [0001] The invention relates to the field of full polarization synthetic aperture radar image processing, in particular to a full polarization synthetic aperture radar image speckle noise filtering method. Background technique [0002] The image of full polarization SAR has strong multiplicative noise. If no noise reduction filtering is performed, it will adversely affect the subsequent polarization target decomposition, object classification and physical parameter estimation. The commonly used boxcar filter can achieve a great noise reduction effect in uniform areas, but it will blur edge information and eliminate small features in non-uniform areas. The improved Lee filter proposed by Lee uses 8 non-square windows to match the edge shape information in the filter window, and then uses the points in the selected non-square window to filter together with the center point (see literature [1]: J.S.Lee, M.R.Grunes, and G.De Grandi, “Polarimetric SAR speckle fi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9076
Inventor 朱飞亚张云华李东
Owner NAT SPACE SCI CENT CAS