Geometric pretreatment method for vertical rail swing images of satellite-borne linear array sensor

A linear array sensor, preprocessing technology, applied in image data processing, instrumentation, image enhancement and other directions, can solve problems such as large geometric distortion

Inactive Publication Date: 2014-05-07
WUHAN UNIV
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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a high-precision geometric preprocessing method for the swing-sweep imaging method of the spaceborne linear array sensor to solve the problem of lar

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  • Geometric pretreatment method for vertical rail swing images of satellite-borne linear array sensor
  • Geometric pretreatment method for vertical rail swing images of satellite-borne linear array sensor
  • Geometric pretreatment method for vertical rail swing images of satellite-borne linear array sensor

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Embodiment Construction

[0061] The present invention proposes a geometric preprocessing of the vertical orbit sweep image of a space-borne linear array sensor. The problem to be solved is to realize the vertical High-precision geometric preprocessing of orbital sweep images. The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0062] Embodiment Aiming at the vertical orbit swing image of the spaceborne linear array sensor, the reference ellipsoid adopts the WGS84 ellipsoid (involving the earth-centered Cartesian coordinate system and the geographic coordinate system), and the earth-centered inertial coordinate system adopts the J2000 inertial coordinate system as an example, and the steps are executed As follows, computer software technology can be used to realize the automatic operation process:

[0063] Step 1. According to the imaging geometry of the original single-frame image, the collinear equation model of the or...

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Abstract

The invention discloses a geometric pretreatment method for vertical rail swing images of a satellite-borne linear array sensor. The geometric pretreatment method comprises steps of establishing a collinearity equation model of original single-frame images according to the imaging geometry of the original single-frame images; performing geometric correction treatment on all the original single-frame images, dividing all the original single-frame images into virtual three-dimensional grids, resolving rational polynomial model coefficients corresponding to the original single-frame images, establishing a positive and negative calculation relation of each original single-frame image coordinate and a tangent plane image coordinate, and performing geometric correction on all the original single-frame images on the basis of a rational polynomial model to obtain frame images under an object space tangent plane coordinate, wherein the geometric correction treatment comprises constructing a mutual conversion relation of an object space local coordinate and a geocentric rectangular coordinate and constructing a mutual conversion relation of the tangent plane image coordinate and the object space local coordinate; splicing all the frame images under the object space tangent plane coordinate on the basis of the coordinate to obtain the spliced images; resolving the rational polynomial model coefficients corresponding to the spliced images.

Description

technical field [0001] The invention belongs to the field of aerospace and aerial photogrammetry, and relates to a high-precision geometric preprocessing method of a space-borne linear array sensor in a pendulum-sweep imaging mode. Background technique [0002] Linear array CCD (charge-coupled device image sensor) is currently the main sensor for obtaining high-resolution optical satellite images. In the process of high-resolution optical imaging, the CCD observation field is narrow due to the long focal length of the lens. Using vertical orbit swing-broom imaging instead of along-track push-broom imaging can effectively increase the observation field of view. However, in the vertical orbit sweep imaging method, the imaging relationship is more complicated due to the mirror sweep movement, and the geometric distortion of the obtained image is large, which needs to be solved urgently in high-precision geometric applications. [0003] Conventional line scan images realize sy...

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Application Information

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IPC IPC(8): G06T5/00G06T5/50
Inventor 金淑英王密
Owner WUHAN UNIV
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