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CME detection and tracking method based on machine learning

A machine learning and image technology, applied in the direction of neural learning methods, instruments, computer components, etc., can solve the problem of consuming a lot of manpower

Active Publication Date: 2019-12-03
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the sun is close to its maximum activity, the detection and tracking of CMEs will consume a lot of manpower. The above shortcomings of manual CME catalogs have prompted the development of automatic catalogs.

Method used

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  • CME detection and tracking method based on machine learning
  • CME detection and tracking method based on machine learning
  • CME detection and tracking method based on machine learning

Examples

Experimental program
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Embodiment

[0082] Each step of the present invention is described below according to an embodiment.

[0083] Step (1), image preprocessing stage. The 1024×1024 resolution input image LASCO C2 is down-sampled and denoised, and the difference image is calculated.

[0084] Step (11), use the lasco_readfits.pro in the solar physics software package (SSW) to read and download the 0.5-level LASCO C2 file, and then use the reduce_level_1.pro in the SSW to process the 1-level data, which includes dark current, stray light, and distortion , vignetting, metering, time and position correction calibration. After processing, the North Pole direction of the sun is consistent with the North Pole direction of the image. All input LASCO C2 images with 1024 × 1024 resolution are first downsampled to 512 × 512 resolution and aligned according to the coordinates of the center of the sun. All downsampled images are then passed through a noise filter to suppress some sharp noise features. A normalized box...

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Abstract

The invention discloses a method for detecting and tracking CME based on machine learning, and the method achieves the detection and tracking of CME (coronal mass ejection) through four stages of preprocessing, classification, detection and tracking on the basis of a white light coronagraph image. In the preprocessing stage, down-sampling and differential image calculation are carried out on an image. In the classification stage, a supervised image classification method is used to classify a given white-light coronagraph image into a CME type and a CME-free type, and then middle-layer featuresextracted from a trained CNN are used to detect the area of the CME. In the detection stage, a CME area is mined by using an unsupervised image cooperative positioning method. In the tracking stage,an image is converted into a polar coordinate system, CMEs at different positions are divided, some rules are defined to clean and filter the CMEs, and basic parameters of all the detected CMEs are calculated.

Description

technical field [0001] The invention belongs to the fields of computer image processing and computer vision, and in particular relates to a method for detecting and tracking CME based on machine learning. Background technique [0002] Space missions to observe coronal mass ejections (CMEs) date back to the 1970s. The coronagraph on the SOHO satellite has made a great contribution to the CME observation, for example, the Large Angle and Spectrometric Coronagraph Experiment (LASCO) can track the CME from 1.1 to about 30Rs. Since the launch of the Solar TErrestrial RElations Observatory (STEREO), CMEs can be observed from two different telescopes COR1 and COR2 in the instrument package of the Solar Terrestrial RElations Observatory (STEREO). With the massive accumulation of coronal image data, the ability to automatically detect, track different features and construct corresponding event catalogs (especially CMEs) becomes more and more important. On the one hand, this can pro...

Claims

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Application Information

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IPC IPC(8): G06K9/62G06K9/46G06K9/44G06N3/04G06N3/08
CPCG06N3/08G06V10/34G06V10/40G06V10/44G06N3/045G06F18/241G06F18/214
Inventor 张岩封莉王鹏宇袁汉青卢磊甘渊李舒婷黎辉潘云逸
Owner NANJING UNIV
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