Selection method for counting identical distribution space pixel based on time sequence SAR (Synthetic Aperture Radar) image

Abstract

The invention discloses a selection method for counting an identical distribution space pixel based on a time sequence SAR (Synthetic Aperture Radar) image. The selection method comprises the following steps: firstly, carrying out pre-processing on an original SAR image data sequence to obtain a single-visual SAR strength image sequence; carrying out registration on the SAR strength image sequence; acquiring a rejection region of a likelihood ratio test under the assumption that a single-visual SAR strength image subjected to the registration complies with index statistical distribution; comparing the counting similarity of a time sample of each space pixel in a rectangular sliding window and a time sample of a central reference pixel; traversing each space pixel in a whole image and acquiring an identical statistical distribution sample of each space pixel; filtering the SAR image by adopting Lee filtering and the identical distribution sample of each space pixel. According to the selection method disclosed by the invention, samples with the same attribute of the reference pixel are selected through a likelihood ratio assumption test, so that a spatial distribution law and a backward scattering property of pixel points in a radar image are met better and a filtering image with the full resolution ratio which is closer to a real ground surface is obtained.

Description

technical field [0001] The invention belongs to the technical field of SAR data processing, and in particular relates to a statistically identically distributed space pixel selection method based on time-series SAR images. Background technique [0002] In recent years, with the continuous launch of new spaceborne SAR (Synthetic Aperture Radar, synthetic aperture radar) sensors, time-series SAR technology occupies an increasingly important position in radar remote sensing applications. Since the SAR echo signal is the accumulation of the backscattering contributions of scatterers in the ground resolution unit, these scatterers exhibit random phases, leading to the formation of coherent speckles in the SAR data signal. How to effectively remove the coherent speckle noise in SAR data and restore the true SAR reflection value has always been a difficult point in SAR research. SAR coherent speckle filtering has been proposed since the 1980s, such as multi-view filtering, Lee fil...

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Problems solved by technology

[0004] The purpose of the present invention is to make the SAR filtering result reflect the real radar backscatter coefficient, propose a method based on time-series SAR image statistical same distribution space pixel selection method, realize SAR same distribution sample selection, solve the likelihood ratio test in comparing space pixel similarity Technical problems of boundary blur and image distortion caused by heterogeneous pixels participating in filtering in traditional SAR image coherence speckle filtering with limited degree

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