Automatic SAR image registration based on geometric topological relationship of feature points

Abstract

The invention discloses a SAR image automatic registration method based on the geometrical topological relationship of feature points, belonging to the field of remote sensing image processing and application. Through five steps of extracting the fixed region and center of mass of the image, determining the geometric topological relationship between pairs of non-collinear matching points, findinga complete set of matching points based on geometric topological relations, screening the set of points with the same name, and image registration, Automatic registration of SAR images under affine transformation is completed, which solves the problems of image gray and noise sensitivity in common SAR image registration methods, and has the advantages of strong anti-noise ability, high registration accuracy and low algorithm complexity, and has a wide application prospect in geographic remote sensing and military reconnaissance.

Description

technical field [0001] The invention relates to an image automatic registration method, in particular to a SAR image automatic registration method with an affine transformation relationship. Background technique [0002] Image registration is a process of linearly or non-linearly transforming two or more images of the same region or object obtained from different periods, different viewpoints, or different sensors, so that the two images can match geometrically. Its working principle is to use the feature point pairs with the same name in the reference image and the image to be registered to obtain the transformation relationship between the two images, so as to transform the coordinate system of the image to be registered into the coordinate system of the reference image. [0003] The parameter estimation of transformation relation is the key technology of automatic image registration. At present, there are mainly two approaches for automatic image registration: (1) method...

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Problems solved by technology

[0005] Aiming at the shortcomings of the existing SAR image automatic registration technology, such as low anti-noise ability of feature points and high computational complexity of points with the same name, a SAR image automatic registration method based on the geometric topological relationship of feature points is proposed.

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