Image matching method with large edge distortion

Abstract

The present invention provides an edge large distortion image matching method. The method comprises the steps of: establishing each-level pyramid image for an image to be matched and a reference image, and performing rough matching; employing an integrated radiation transformation model to perform model construction according to a rough matching result so as to eliminate parallax; employing a multi-level and multi-feature mode, performing segmentation and blocking processing of the image to be matched and the reference image according to a multi-level and multi-feature matching rule grid, andperforming multi-level and multi-feature matching for each block obtained after segmentation and blocking processing; performing segmentation and blocking processing of the image to be matched according to a gross error elimination rule grid, and employing the radiation transformation model to perform loop iteration for each grid in the gross error elimination rule grid for gross error elimination; and employing one control point of each grid after gross error elimination, employing an integrated cubic polynomial iteration model for gross error elimination again according to a camera objectivelens radial directional and tangential distortion for theory to obtain high-precision matching points and perform output according to a predetermined format.

Description

technical field [0001] The invention belongs to the field of photogrammetry and computer vision, and relates to a high-precision registration scheme for large edge distortion images based on image segmentation and multi-level multi-features, in particular to a matching method for large edge distortion images, which is used for image segmentation and block segmentation And multi-level multi-feature mode, high-precision automatic matching of control points is performed on large edge distortion images. Background technique [0002] At present, domestic high-resolution optical satellites all use three-mirror coaxial or triple-mirror off-axis optical systems. Due to the influence of radial and tangential distortion of the optical system, the geometric distortion of the edge of the image before the camera’s in-orbit geometric calibration is very large, and the middle The distortion is small. For example, the distortion of the panchromatic / multispectral camera image of the Gaofen-1...

AI Technical Summary

Problems solved by technology

[0004] 1) If large edge distortions are taken into account, too many mismatch points will be caused due to the large search range, and it is impossible to construct a strict geometric constraint model for gross error elimination;

[0005] 2) If the small distortion in the middle is taken into account, due to the small search range, it will cause the problem that points cannot be matched except the central area

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