Method for quickly extracting star points from star images

A star point extraction and star map technology, applied in the field of navigation, can solve the problems of high complexity and low star point extraction efficiency
CN104899892AActive Publication Date: 2015-09-09XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2015-09-09

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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.
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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...

Claims

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