InSAR rapid image registration method based on quadtree segmentation

Abstract

The invention discloses an InSAR rapid image registration method based on quadtree segmentation. The method is characterized in that through the combination of an image quadtree segmentation criterionand an FFT maximum correlation coefficient registration principle, rough registration and rough segmentation are carried out on the InSAR main and auxiliary complex images, and then the quadtree treestructure image block segmentation and sub-block FFT maximum correlation coefficient sub-pixel registration are carried out, the sub-block quadtree segmentation and the sub-block sub-pixel registration are carried out on the InSAR complex image one by one, and the global image interpolation of the traditional FFT maximum correlation coefficient registration is avoided, and the rapid sub-pixel registration of the large-scene InSAR complex image is achieved. The global image interpolation of the traditional FFT maximum correlation coefficient registration is avoided, the operation efficiency ofthe large-scene InSAR complex image registration is effectively reduced, and the good registration precision and operation efficiency in the InSAR main and auxiliary complex images with large pixel offset change can be achieved.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar (SAR), in particular to the technical field of interferometric SAR (InSAR) imaging. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is an extension of Synthetic Aperture Radar (SAR) imaging technology, which mainly uses more than two SAR images obtained by observing the same observation scene at different angles or at different time periods by using more than two antennas or multiple passes. Extract the interferometric phase information of SAR images, and then combine the imaging geometric relationship to invert the terrain elevation information, so as to realize the remote sensing technology of high-precision terrain three-dimensional surveying and mapping. For details, see the literature "Li Hongyu. Research on key technologies of interferometric synthetic aperture radar elevation measurement [D]. University, 2016". Interferometric SAR has the adv...

AI Technical Summary

Problems solved by technology

However, most of the existing high-precision registration algorithms often register the InSAR complex images as a whole or fixed blocks. For the large number of complex images in a large scene, large changes in sub-region offsets, etc., there may be a decrease in local registration accuracy. , large amount of computation, etc.

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