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Method and device for realizing extraction of star target under high dynamic condition

A target extraction and high dynamic technology, applied in the direction of integrated navigator, etc., can solve the problems of segmentation error, unfavorable star target extraction, etc., achieve the effect of removing large area noise and improving positioning accuracy

Active Publication Date: 2010-10-06
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Although the connected domain algorithm has the advantages of simple algorithm, easy hardware implementation, and fast processing speed, but this method is based on the principle of connectivity, which will divide a star from its broken part into different stars, resulting in segmentation errors, which is not conducive to the smooth realization of star target extraction.

Method used

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  • Method and device for realizing extraction of star target under high dynamic condition
  • Method and device for realizing extraction of star target under high dynamic condition
  • Method and device for realizing extraction of star target under high dynamic condition

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Embodiment Construction

[0073] Under high dynamic conditions, the size and direction of the adaptive window can be selected for stars. In the selected window, the breakpoint of the star is judged first, and the structural elements of the broken star are selected according to the relative position of the breakpoint, and the method of active growth is used to repair it, so as to improve the positioning accuracy of the star image. Finally, the center of mass is calculated to realize the star segmentation. The specific implementation process is as figure 2 shown.

[0074] see figure 2 , figure 2 It is a flow chart of realizing astral object extraction according to an embodiment of the present invention, and the process includes the following steps:

[0075] Step 201: Scan the starry sky image from top to bottom and from left to right.

[0076] Step 202: Determine whether the current pixel grayscale is greater than a preset threshold, if so, go to step 203; otherwise, go to step 209.

[0077] Ste...

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Abstract

The invention discloses a method and a device for realizing the extraction of a star target under a high dynamic condition, which can both select a self-adaption window aiming at a star, judge the breaking point of the star in the selected self-adaption window, carry out active growth based on a structural element on the broken star according to the judgment result of the breaking point and carry out centroid calculation used for supporting the extraction of the star target aiming at the window finishing the active growth of the star. Because of applying the self-adaption window to carry out the extraction of the star target and utilizing an active growth method to repair the broken star, the method and the device can adapt to different motion states of a star sensor and extract the star target effectively; the method and the device can carry out effective extraction under the condition that a star image is broken, can carry out growth repair on the broken star and enhance the positioning accuracy effectively, and can effectively remove large-area noise caused by moonlight and the like.

Description

technical field [0001] The invention relates to astral data processing technology, in particular to a method and device for realizing astral target extraction under high dynamic conditions. Background technique [0002] The star sensor is a high-precision and high-reliability attitude measurement component widely used in today's aerospace vehicles. The accuracy indicators of star sensors at home and abroad have reached a very high level. Since the operation of the high dynamic carrier puts forward very high requirements on the dynamic performance of the attitude measurement device of the star sensor, how to improve the dynamic performance of the star sensor has become a new research hotspot. [0003] Under high dynamic conditions, how to extract the star position coordinates for star map recognition from the original star map image output by the image sensor—that is, star image positioning is a key and basic work in the design of star sensors . Before extracting the star p...

Claims

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Application Information

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IPC IPC(8): G01C21/24
Inventor 张广军金雁江洁魏新国樊巧云
Owner BEIHANG UNIV
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