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Star extraction method based on energy distribution

A technology for star point extraction and energy distribution, which is applied in measurement devices, instruments, surveying and navigation, etc., can solve the problems of marking conflict, complexity, and large amount of data, and achieve the effect of improving accuracy and real-time performance.

Inactive Publication Date: 2014-07-09
HARBIN ENG UNIV
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Problems solved by technology

Among them, the multi-threshold clustering method is to cluster and identify pixels whose grayscale is greater than the global background threshold. This method involves sorting operations and is relatively complicated. The star map preprocessing is characterized by a large amount of data, so the algorithm is complex. Sex has higher requirements
The connected domain notation method has the problem of label conflicts and requires backtracking scanning, so the calculation time is relatively long

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  • Star extraction method based on energy distribution
  • Star extraction method based on energy distribution
  • Star extraction method based on energy distribution

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Embodiment Construction

[0019] The present invention will be further described in detail in conjunction with the accompanying drawings and implementation examples.

[0020] A star point extraction method based on energy distribution, comprising the following steps:

[0021] Step 1: Scan the image sequentially, and compare the gray value of the image with the threshold S;

[0022] Step 2: If the gray value of a certain pixel is greater than S, search for a 3×3 pixel area around it;

[0023] Step 3: Determine whether there are p pixels whose gray value is greater than T in the 3×3 pixel area around the pixel;

[0024] Step 4: If the judgment of step 3 is successful, use the centroid method to extract the centroid of the star point in the 5×5 area around the pixel, otherwise continue scanning;

[0025] The present invention is a method for extracting star points based on energy distribution, comprising the following steps:

[0026] Step 1: Scan the image sequentially, and compare the gray value of th...

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Abstract

The invention belongs to the technical field of star extraction, and specifically relates to a star extraction method based on energy distribution. The star extraction method comprises following steps: images are scanned successively, and grey values of the imagines are compared with threshold value S; if the grey value of an image element is larger than S, then a nearby 3X3 image element area is searched; it is determined that in the 3X3 image element area whether the grey values of p image elements are larger than T; if it is determined that in the 3X3 image element area the grey values of p image elements are larger than T, then a star centroid is extracted from a nearby 5X5 area via centroid algorithm, otherwise scanning is carried out continuously. The star extraction method is capable of increasing accuracy of star centroid extraction; simultaneous performing of the two star map dividing stages and centroid algorithm can be realized; and real-time performance of star map processing is improved.

Description

technical field [0001] The invention belongs to the technical field of star point extraction, and in particular relates to a star point extraction method based on energy distribution. Background technique [0002] Star sensors can provide high-precision attitude measurement information and are indispensable equipment for most space vehicles. The star sensor has two working modes: initial attitude acquisition mode and tracking mode. Under normal circumstances, the star sensor works in the tracking mode, and only turns to the initial attitude acquisition mode at the initial moment or when the tracking fails. The working process of tracking mode can be divided into: star point extraction, star map matching and attitude calculation. Among them, the preprocessing of the star map in star point extraction is related to the accuracy of the centroid extraction, and the accuracy of the centroid extraction will seriously affect the accuracy of the attitude measurement, so the preproc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 钱华明孙龙蔡佳楠钱林琛黄蔚
Owner HARBIN ENG UNIV
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