Image-segmentation-based registration method of polarized InSAR image in repeated passing

Abstract

The invention, which belongs to the technical field of polarized interferometric synthetic aperture radar detection, discloses an image-segmentation-based registration method of a polarized InSAR image in repeated passing. The method comprises: a reference image and a pre-registered image of a polarized interferometric synthetic aperture radar are obtained; an amplitude cross-correlation matrix of the reference image and the a pre-registered image is calculated and common position parts of the reference image and a pre-converted image are obtained and then are used as a main image and an auxiliary image respectively; graded registration is carried out on the main image and the auxiliary image, thereby obtaining offsets of sub images at all levels in the auxiliary image relative to sub images at all levels in the main image; according to the offsets of sub images at all levels in the auxiliary image relative to sub images at all levels in the main image, an overall offset of the auxiliary image relative to the main image is calculated; and on the basis of the overall offset of the auxiliary image relative to the main image, values of all pixel points in the auxiliary image are calculated and then an auxiliary image after registration is obtained.

Description

technical field [0001] The present invention relates to the technical field of polarization interference synthetic aperture radar detection, in particular to a method for registration of polarized InSAR images based on image segmentation, which can be used for airborne radar to detect large differences in speed or baseline of repeated passes in the same scene In the case of image registration, the precise registration of polarization InSAR images with serious azimuth or range spatial variation in the offset. Background technique [0002] The polarization interferometric synthetic aperture radar technology is a cutting-edge technology in modern radar remote sensing measurement. It can make full use of the amplitude information, phase information and polarization scattering information carried by the radar echo. It not only has the sensitivity of the interferometric synthetic aperture radar to the spatial distribution and elevation, but also has the sensitivity of the polariza...

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Problems solved by technology

[0006] The present invention aims at the defects of inaccurate registration of polarized InSAR images due to the serious phenomenon of image rotation and stretching in the case of large differences in the speed or baseline of the carrier aircraft in the two passes of the above-mentioned prior art, and proposes an image-based Segmented repeated flight over polarimetric InSAR image registration method, through the registration process of hierarchical blocks, to ensure that the image can be effectively eliminated when there is a large offset space variation in both the azimuth and range directions. The telescopic rotation problem makes the common parts of the two images accurately registered to obtain better quality registration results

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