Method for positioning mass center of spatial object star image

A technology of centroid positioning and space target, which is applied in the field of space target star positioning and can solve problems such as low accuracy

Inactive Publication Date: 2012-11-21
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the existing space object star image centroid location method with low precision, the present invention provides a space object star image center of mass location method

Method used

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  • Method for positioning mass center of spatial object star image
  • Method for positioning mass center of spatial object star image
  • Method for positioning mass center of spatial object star image

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Embodiment Construction

[0036] 1. Rough positioning of the target area.

[0037] According to the formula (1-3), calculate the judgment threshold Ths of the target area coarse positioning.

[0038] mean = 1 m × n Σ i = 1 m Σ j = 1 n I ( i , j ) - - - ( 1 )

[0039] var 2 = 1 m × n Σ i = 1 m Σ j ...

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Abstract

The invention discloses a method for positioning the mass center of a spatial object star image, which is used for solving the technical problem of low accuracy of the conventional method for positioning the mass center of the spatial object star image. The technical scheme is that: by using a defocused spot imaging mechanism of the spatial object star image and accurately extracting a target area through the energy distribution concentration of the spatial object star image, dependence on a threshold when the target area is extracted by binarization segmentation of a fixed threshold is avoided, and the method has universal applicability; a positioning error which is to be introduced into image background noise is considered, and effective image elements in a target accurate light spot area extracted by concentrated energy distribution are used for gray scale correction, so that mass center positioning accuracy is improved; therefore, the mass center positioning error is improved to 0.08 image element from 0.5 image element in the prior art.

Description

technical field [0001] The invention relates to a method for locating a star image of a space object, in particular to a method for locating the center of mass of a star image of a space object. Background technique [0002] The purpose of extracting the astronomical center of mass of a space target is to perform precise astronomical positioning on the target, and the accuracy of the centroid extraction directly determines the accuracy of the astronomical positioning of the target. Usually, in a space imaging system, the space target is generally regarded as an ideal point light source, and a defocused optical system is designed to disperse the star point image on several CCD pixels, and then the subdivision positioning algorithm is used to obtain The center position of the star point enables the positioning of the star point to achieve sub-pixel or higher precision. Therefore, it is very important to locate the center of mass of the target star image with low signal-to-noi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46
Inventor 孙瑾秋周军朱宇张臻黄建余惠建江
Owner NORTHWESTERN POLYTECHNICAL UNIV
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