Polarized synthetic aperture radar (SAR) image speckle reduction method based on polarization decomposition and image block similarity

Abstract

The invention discloses a polarized synthetic aperture radar (SAR) image speckle reduction method based on polarization decomposition and image block similarity. The polarized SAR image speckle reduction method mainly solves the problem that in the prior art, after sparkle reduction is conducted on a polarized SAR image, structural information is lost due to the fact that the utilization of polarized information is not enough. The polarized SAR image speckle reduction method includes the achieving steps: (1) reading in a polarized SAR image Z; (2) carrying out polarized decomposition on the image Z; (3) simulating and obtaining an imitating polarized SAR image M; (4) carrying out statistics on measurement of similarity of covariance matrixes among points of the imitating polarized SAR image M; (5) searching and obtaining a local homogeneous area Qi which corresponds to a point I from the first point I of the image Z; (6) carrying out speckle reduction process on the point I in the local homogeneous area Qi; (7) repeating the step (5) and the step (6) to process each point in the image Z, and obtaining a final speckle reduction result. The polarized SAR image speckle reduction method significantly improves speckle inhibiting ability of the polarized SAR image, effectively reduces speckle on homogeneous areas, at the same time, is capable of effectively keeping the structural information in non-homogeneous areas, and can be used for preprocessing polarized SAR data.

Description

technical field [0001] The invention belongs to the technical field of image processing, relates to speckle reduction in polarimetric SAR images, and is a method for speckle reduction in polarimetric SAR images based on polarization decomposition and image block similarity. This method can be used to reduce speckle in lower resolution polarimetric SAR images. Background technique [0002] Polarimetric SAR has become the development trend of SAR technology, and the understanding and application of polarimetric SAR images is a research hotspot among scholars at home and abroad. Polarization Synthetic Aperture Radar (SAR) is a multi-parameter, multi-channel microwave imaging radar system that can simultaneously obtain radar images of ground scenes under different polarization combinations, providing More informative, widely used in oceanography, glaciology and land research. Due to the coherent imaging characteristics of SAR and polarimetric SAR, their inherent coherent speck...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of loss of structural information due to insufficient use of polarization information after despotting of polarimetric SAR images in the prior art, and propose a descaling of polarimetric SAR images based on polarization decomposition and image block similarity method to achieve effective speckle reduction in homogeneous areas while maintaining structural information in non-homogeneous areas, and improve the suppression effect of coherent speckle in polarimetric SAR images

Images