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Full-polarization SAR image speckle suppression method

A coherent speckle suppression and full polarization technology is applied in the field of image processing to achieve the effect of reducing the filtering effect and improving the operating efficiency

Active Publication Date: 2019-10-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Gregory Faragc et al. proposed to use full polarization information to perform feature detection on information such as edges and point targets in the wavelet domain to ensure the boundary and detail information of the image, and then perform speckle reduction operation, which can better eliminate coherent speckles in homogeneous regions. However, since the polarization scattering information of the sample in the image has been decomposed, it is difficult to reuse it for subsequent image manipulation

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  • Full-polarization SAR image speckle suppression method
  • Full-polarization SAR image speckle suppression method
  • Full-polarization SAR image speckle suppression method

Examples

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Embodiment

[0052] figure 1 It is a flow chart of a method for suppressing coherent speckle in a full-polarization SAR image of the present invention.

[0053] In this example, if figure 1 Shown, a kind of fully polarized SAR image speckle suppression method of the present invention comprises the following steps:

[0054] S1. Obtain the full-polarization synthetic aperture radar SAR image in the observation area; in this embodiment, select the full-polarization SAR image of a certain area acquired by the C-band RadarSat-2 in November 2013, and the size of the image is . The obtained SAR image is as figure 2 shown.

[0055] S2. Polarization decomposition of SAR images

[0056] Calculate the coherence matrix of each pixel in the SAR image, and then use the hybrid four-component (HPD) algorithm to decompose the coherence matrix to obtain the scattering feature vector V of each pixel HPD =[P s P d P v +P c ] T , where P s is the surface scattered power, P d is the secondary sca...

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Abstract

The invention discloses a full-polarization SAR image speckle suppression method. Polarization decomposition is carried out on a target by combining a polarization SAR scattering model on the basis ofnon-local Lee filtering, a more accurate similar set is obtained according to polarization similarity among pixels, and scene target polarization scattering characteristics and texture detail information are better kept while noise is filtered, so that a visualization result of coherent speckle suppression is obtained; in this way, the problems that an existing algorithm is high in complexity andtoo long in consumed time are solved through the improved weight acceleration algorithm, then, an image accumulation matrix is introduced to eliminate redundant calculation, the calculation complexity is greatly reduced on the basis that the filtering effect of the algorithm is kept, and the operation efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and more specifically relates to a method for suppressing coherent speckle in a full-polarization SAR image. Background technique [0002] As an active microwave imaging technology, Synthetic Aperture Radar (SAR) can truly realize all-day and all-weather imaging, and obtain ground object scattering information that cannot be obtained by passive remote sensing. At present, as an important means of geospatial information acquisition, SAR imaging technology has been widely used and developed in scientific research, military defense, environmental assessment, resource exploration, and national economy. [0003] But also because of the unique imaging mechanism of SAR, there are a large number of coherent spots in its image. Speckle noise spreads all over the image, which seriously affects the image quality and causes great difficulties in the recognition and extraction of targets. Therefore...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T5/00
CPCG06T2207/10044G06V20/13G06T5/70
Inventor 陈彦陈云坪冉崇敬
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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