Automatic extraction method for sun outline

An automatic extraction and sun technology, applied in the field of solar physics, can solve problems such as limited resolution, high resolution, and poor application, achieving high precision and processing efficiency, low data quality requirements, and high algorithm processing efficiency Effect

Inactive Publication Date: 2015-07-15
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The automatic extraction method of the sun profile has been proposed in the world (reference [9]), however, this method mainly uses the data obtained by the space telescope for processing, because the resolution of this data is relatively high due to the fact that it is not interfered by the eart

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  • Automatic extraction method for sun outline
  • Automatic extraction method for sun outline
  • Automatic extraction method for sun outline

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Embodiment Construction

[0043] Embodiments of the present invention are described as follows in conjunction with accompanying drawings:

[0044] The specific implementation steps of the sun profile automatic extraction method of the present invention are as follows:

[0045] 1) to the original figure 1 Carry out the morphological closing operation, in which the structural element is set as a circle with a radius of 30 pixels, and the obtained figure 2 ;

[0046] 2 pairs figure 2 Carry out the erosion operation, where the structural element of the operation is calculated as a circle with a radius of 1 pixel, and get image 3 ,in image 3 radius ratio figure 2 be 1 pixel smaller;

[0047] 3) figure 2 minus image 3 ,get Figure 4 ;

[0048] 4) Using the adaptive threshold method to Figure 4 Segmentation is performed to obtain binarization Figure 5 ;

[0049] 5) extract Figure 5 For the coordinate information of the white area in the middle, store the values ​​of the abscissa and or...

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Abstract

The invention belongs to the solar physics of the field of astronomy in China and provides an automatic extraction method for the sun outline. The method comprises the following steps: aiming at the full-disk monochromatic image of the Huairou Solar Observing Station of the National Astronomical Observatories of China, obtaining the gray scale information of the solar limb by using morphological close operation and erosion operation; then, extracting a limb coordinate by using a self-adaptive threshold method; finally, fitting the limb coordinate by combining a least square fitting method, and thus obtaining a connected solar limb binary image. Compared with other international algorithms, the method can process lower-quality solar observation data with instrument noise and fills the blank of domestic related fields. The method has important significance and practical value on determining the solar disk radius and the earth-sun distance, calculating the position of solar activity in the solar disk and researching the evolution law of the sun outline.

Description

technical field [0001] The invention belongs to the image processing technology in the field of solar physics, in particular to a method suitable for automatic extraction of solar contours. Background technique [0002] The sun is a typical star, which is inseparable from human life and production activities. The sun's light and heat warm the earth and maintain the proper environment necessary for human survival and all life activities on the earth. The changes of the four seasons, the alternation of day and night, the wind, cloud, rain and snow, and the growth of plants that we see are all the result of the action of the sun (references [1-3]). However, intense solar activity will also disturb the solar-terrestrial space and the upper atmosphere of the earth, causing a series of important phenomena, and affecting the safety of space flight, life estimation of artificial satellites, radio communication, polar power system, geophysical prospecting, Meteorological and hydrolo...

Claims

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Application Information

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IPC IPC(8): G06K9/46G06T7/00
Inventor 赵翠林钢华邓元勇
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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