A Fast Image Registration Method of Insar Based on Quadtree Segmentation

Abstract

The invention discloses a fast registration method for InSAR based on quadtree segmentation. It combines the image quadtree segmentation criterion and the FFT maximum correlation coefficient registration principle, and performs rough registration and rough segmentation on the primary and secondary complex images of InSAR first. , and then carry out the sub-pixel registration of quadtree structure image block and sub-block FFT maximum correlation coefficient, the present invention utilizes InSAR complex image one by one sub-block quadtree segmentation and sub-block sub-pixel registration, avoiding the traditional FFT maximum correlation Global image interpolation for coefficient registration, thus realizing fast sub-pixel registration of large scene InSAR complex images. It avoids the global image interpolation of traditional FFT maximum correlation coefficient registration, effectively reduces the computational efficiency of large-scene InSAR complex image registration, and has good registration accuracy and computational efficiency for InASAR primary and secondary complex images with large pixel offset changes .

Description

Technical field The invention belongs to the technical field of synthetic aperture radar (SAR), and particularly relates to the technical field of interferometric SAR (InSAR) imaging. Background technique Interferometric Synthetic Aperture Radar (InSAR) is an extension of synthetic aperture radar (SAR) imaging technology. It mainly uses more than two antennas or multiple voyages to obtain two or more SAR images of the same observation scene at different angles or at different time periods. Extract the interferometric phase information of the SAR image, and combine the imaging geometric relationship to invert the terrain elevation information, so as to realize the remote sensing technology of high-precision three-dimensional terrain surveying and mapping. For details, please refer to the document "Li Hongyu. Research on Key Technologies of Interferometric Synthetic Aperture Radar Elevation Measurement[D]. University, 2016". Interferometric SAR has the advantages of large imagin...

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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