关键词: 配准, SURF, 特征点

Abstract: Synthetic aperture radar (SAR) image coregistration is a key step in synthetic aperture radar interferometric(InSAR) data processing. It is a necessary condition for generating good interferograms. However, due to various factors, accurate coregistration is very difficult. Aiming at the problems of large amount of calculation, high mismatch rate and poor coregistration accuracy of conventional coregistration methods, we propose a coregistration method using feature points. First, Speeded Up Robust Feature (SURF) operator is used to extract the feature points from the master amplitude map, and then combined with external geographic data to remove improper feature points and turn them into the remaining feature points for cross-correlation processing, and finally calculating the coregistration of the main and slave images through multiple formulas through the SAR image in the Pearl River Delta and Chile earthquake. The experimental results show that, compared with the standard coregistration method, the method proposed here has the advantages of high coregistration efficiency and strong reliability.

Key words: coregistration, Speeded Up Robust Feature, Feature Points