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A fast method for extracting star points from star map images

A technology of star point extraction and star map, which is applied in the field of navigation, can solve the problems of low efficiency and high complexity of star point extraction, and achieve the effects of cost saving, high star point positioning accuracy, and improved resolution

Active Publication Date: 2017-11-24
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the present invention aims to provide a fast method for extracting star points from star map images, which solves the problems of high complexity and low efficiency of star point extraction in existing star point extraction algorithms

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  • A fast method for extracting star points from star map images
  • A fast method for extracting star points from star map images
  • A fast method for extracting star points from star map images

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution, and provides detailed implementation and specific operation process, but the protection scope of the present invention is not limited to the present invention. Example.

[0059] Such as figure 1 As shown, a kind of fast star map image star point extraction method of the embodiment of the present invention comprises the following steps:

[0060] S101: Segment the star map image: use a multi-window sampling method to determine the threshold in the star map image threshold segmentation method, and separate the star point pixels from the background pixels according to the idea of ​​image segmentation;

[0061] S102: Coarsely locate the observed star points: learn from the idea of ​​clustering algorithm, first classify some star point pixels, regard the pixels belonging to the same star point as a ca...

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Abstract

The invention discloses a method for quickly extracting star points from star images. The method includes: according to a clustering concept, adopting part of star point pixels for coarse positioning of star points so as to realize rough estimation on center coordinates of star point dispersion regions; taking the center coordinates of the star point dispersion regions as seed points to automatically screen star point pixels according to a seed point area region growing method; according to characteristics of star point energy distribution, correcting gray values of the star point pixels; adopting a centroid calculation formula for precision positioning of the star points. Since star point extraction operations are centered in local ranges of the star point dispersion regions by means of coarse positioning of the star points, start point extraction speed can be increased; correction of the gray values of the start point pixels is simple and feasible, and image filtering effects can be achieved while more algorithm time and cost are saved as compared with those of image filtering.

Description

technical field [0001] The invention belongs to the technical field of navigation, and in particular relates to a fast method for extracting star points from star map images. Background technique [0002] As an autonomous astronomical navigation system, star sensors play an important role in automatic sky survey systems and deep space exploration. In the star sensor system, a series of operations must be processed in real time, such as centroid extraction of star image, star recognition and aircraft attitude calculation. Centroid extraction of star map images plays an important role in star sensors. The positioning accuracy of the centroid of the star map image directly affects the accuracy of star recognition and the performance of aircraft attitude calculation. Therefore, a fast and high-precision centroid extraction algorithm is indispensable to improve the performance of the system. [0003] In the past few decades, many scholars have devoted themselves to the researc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/136
CPCG06T7/10
Inventor 许录平罗丽燕张华孙景荣程鹏飞赵闻博王光敏简阅
Owner XIDIAN UNIV
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