Image geometric correction method for space camera with 45-degree rotary scanning mode

Abstract

The invention provides an image geometric correction method for a space camera with a 45-degree rotary scanning mode. According to the image geometric correction method, a theory and an imaging process of the space camera with the 45-degree rotary scanning mode are analyzed, a reasonable positional correspondence model is established between a position in a remote sensing image and a corresponding ground position, and a coordinate conversion relationship between an original image and a corrected image is constructed; according to the coordinate conversion relationship, space coordinate projection is performed on the original remote sensing image; and a discrete point after projection is subjected to re-sampling by utilizing a Delaunay triangulation algorithm. For ground remote sensing devices sharing a main optical system, a plurality of wavebands can share a coordinate projection relationship and a Delaunay triangular mesh, thereby easily and conveniently correcting data of all the wavebands. The method is reasonable, easy to implement and obvious in effect of improving image distortion.

Description

technical field [0001] The invention relates to the field of optical remote sensing applications, in particular to an image geometry correction method for a space camera in a 45° rotation scanning mode. Background technique [0002] Scanning imaging is the most common imaging mode of space cameras, and the 45°rotational scanning method is widely used in space cameras due to its small size of scanning mirror, wide width, good stability, and ability to observe cold spaces. Such as medium resolution spectral imager, scanning radiometer and so on. The 45°rotating scanning mirror is combined with multi-element concurrent scanning for imaging, and the image rotation caused by the 45°scanning mirror can be eliminated by the K-mirror derotation system or software derotation method. However, during the push-broom process of the 45° rotating scanning mirror, its large width in the direction perpendicular to the track of the sub-satellite point will bring geometric distortion in the i...

AI Technical Summary

Problems solved by technology

Many parameters in strict geometric correction are actually difficult to obtain, while the accuracy and stability of approximate geometric correction are limited by the ability of the model to describe the distortion

For the image geometric distortion of the 45°rotation scanning space camera, there is no ready-made correction method to deal with it

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