Overlapping area correction method suitable for multiple remote sensing images of large region

Abstract

The invention relates to an overlapping area correction method suitable for multiple remote sensing images of a large region. The method comprises the steps of (1) performing automatic adjacent area homonymy point matching on all images to obtain homonymy points; (2) constructing a triangular net by utilizing existing homonymy points; (3) for each homonymy point, calculating coordinates of a homonymy point reference object space; (4) calculating an affine transformation parameter of each image; (5) for each homonymy point, according to image space coordinates and corresponding affine transformation parameters on different images, resolving new observation object space coordinates of the homonymy point on the corresponding image; (6) repeating the steps (3) to (5) until the coordinate change of the reference object space is smaller than a certain threshold or the reference object space is no longer changed; and (7) correcting the corresponding image by utilizing the affine transformation parameter iterated last time. According to the method provided by the invention, the multiple images of the large region can be subjected to overlapping area correction at the same time; the correction precision is higher; and the problems of deformation unevenness and image over-twisting in a conventional correction method are avoided.

Description

technical field The invention relates to a border correction method suitable for multiple remote sensing images in a large area, belongs to the technical field of earth observation, and is a remote sensing image processing technology. Background technique In the application process of remote sensing images, according to the application scenarios and scope requirements, it is often necessary to use multiple remote sensing image products from different sources that have been processed and only have coordinate information to cover a certain range of target areas for work. At this time, these remote sensing image products that already have coordinate information often have poor mutual edge accuracy, which has a considerable impact on the application of data. To solve this problem, the traditional image edge correction algorithm adopts 1) using one of them as a reference to perform polynomial correction on the other image as a whole; 2) using energy The reference image covering...

AI Technical Summary

Problems solved by technology

1. The traditional method can only deal with the edge correction between two images, and cannot process the edge correction of multiple remote sensing images in a large area;

2. When one image is used as a reference to correct the other image as a whole, the part of the corrected image outside the overlapping area will have a large position shift, which will affect the relative accuracy;

3. The secondary correction using the reference image is limited by whether the reference image can be completely covered, and the result of the secondary correction cannot guarantee that the edge accuracy between the two images meets the use requirements;

4. Use the polynomial correction method to correct the overlapping area of ​​the two images. When the error is large, the use of low-order polynomials cannot guarantee the effect of edge correction, and the use of high-order polynomials will often cause excessive stretching of the corrected image ;

5. When using the thin plate spline method to correct the edges between images with large errors, if the geometric deviation exceeds the specified tolerance, the correction result will often be deformed unevenly, and the excessive distortion of the image will affect the use of the situation

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