Automatic Contour Detection and Information Extraction of Solar Radio Frequency Spectrogram

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.