太阳射电频谱图的自动轮廓检测与信息提取

Automatic Contour Detection and Information Extraction of Solar Radio Frequency Spectrogram

射电精细结构是太阳爆发动态频谱图中一个重要的观测现象。为了达到更好提取精细结构轮廓，解读物理信息的目的。基于国家天文台怀柔观测站的2．6～3．8GHz频谱仪于2002年4月21日观测到的爆发现象，采用Levelset方法并加以改进，对原始图像进行轮廓提取，克服了以往此方法中存在遗漏检测的问题。此外对图像进行循环检测，取得了良好地检测结果。此后又对图像进行二值化提取，得到了二值化精细结构图像。最终统计出精细结构漂移率这一重要物理信息，为更好的理解太阳爆发机制提供了依据。

Radio spectral fine structure is an important observation phenomenon in the dynamic frequency spectrogram of solar radio burst. The data are applied with 2, 6-3, 8 GHz spectrum analyzer at the Huairou observatory on 21, Aprial 2002. The contour of radio spectral fine structure is detected by Level set. The level set is improved, and the missing of detection is solved. And then, the original image is changed into the binary image. The drift rates of radio spectral fine structure can be counted. The drift rates are very important, which provide valuable evidences to understand solar radio burst.