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

A technology of space camera and rotation scanning, which is applied in the field of optical remote sensing, can solve the problems of approximate geometric correction accuracy and stability description ability limitation, difficult to obtain, etc., and achieve the effect of convenient correction processing, simple implementation and reasonable method

Active Publication Date: 2015-11-11
SHANGHAI SATELLITE ENG INST
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  • Application Information

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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

Method used

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

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0028] The invention relates to the field of remote sensing image processing. The object of the present invention is to provide a geometric correction method for space camera images suitable for 45°rotational scanning mode, so as to solve the problem of image mismatch. The main improvement of the present invention is that: by analyzing the principle of the space camera and the imaging process of the 45°rotational scanning mode, a reasonable position correspondence model is established between the positi...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 郭玲玲赵其昌马文佳杨勇吴泽鹏薛伶玲李叶飞
Owner SHANGHAI SATELLITE ENG INST
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