基于改进YOLOv8的太阳黑子自动识别

    Automatic recognition of sunspots based on improved YOLOv8

    • 摘要: 随着众多地面和空间太阳望远镜的投入使用,产生了大量的太阳图像数据。基于光球图像的太阳活动区实测研究是一个重要话题,例如,太阳黑子的形成与演化问题、黑子旋转以及动力传输问题等,这些都需要对太阳黑子进行大量的统计分析。因此,黑子的自动识别是开展研究的关键步骤。本文依据太阳黑子形态特征及其在日面上的位置,将其分为规则黑子、不规则黑子、小黑子、黑子群、边缘黑子以及边缘黑子群6大类,并提出一种太阳黑子识别模型——VanillaNet-MBConv-YOLOv8,实现对全日面光球图像中这6类黑子的自动识别。所提网络以VanillaNet替换YOLOv8的原有主干网络Darknet53,以MBConv模块优化原C2f模块,从而增强模型对太阳黑子特征提取的能力,改善网络模型错减、漏检现象,提升检测精度。在SDO/HMI(solar dynamics observatory/helioseismic and magnetic imager)的全日面太阳光球图像上的实验结果表明,所提网络模型相较于原YOLOv8模型以及其他主流网络模型,在网络性能、识别准确率以及漏检现象上均有显著提升。平均识别准确率达到91.0%,召回率达到71.5%,F1-score达到0.80。

       

      Abstract: With the use of many ground-based and space-based solar telescopes, a large amount of solar image data has been generated. The study of solar active region measurement based on photosphere image is an important topic. For example, the problems of sunspot formation and evolution, sunspot rotation and power transmission require a lot of statistical analysis of sunspots. Therefore, the automatic identification of sunspots is a key step to carry out research. In this paper, according to the morphological characteristics of sunspots and their positions on the solar plane, sunspots were divided into 6 categories: regular sunspots, irregular sunspots, small sunspots, sunspot groups, edge sunspots and edge sunspot groups and a sunspot recognition model,VanillaNet-MBConv-YOLOv8 was proposed. The automatic recognition of these 6 types of sunspots in full-day photosphere image was realized. The network proposed replaced the original Darknet53 backbone network of YOLOv8 with VanillaNet, optimized the original C2f module with MBConv module, thereby enhancing the model's ability to extract sunspot features, improving the phenomenon of error reduction and missing detection of the network model, and increasing the detection accuracy. The experimental results on SDO/HMI(solar dynamics observatory/helioseismic and magnetic imager) full-day photospheric images show that compared with the original YOLOv8 model and other mainstream network models, the proposed network model has significantly improved network performance, recognition accuracy and missing detection phenomena. The precision could reach 91.0%, recall could reach 71.5%, and F1-score could reach 0.80.

       

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