Recognition and positioning of hailstorm based on chain code information
基于链码信息的雹云识别及冰雹落区定位

In this paper, a new method of processing codes was proposed, which enabled the Minimize Sum Statistical Direction Code (MSSDC) based on Freeman chain code to be invariant to the origin and rotating, and also enabled the direction entropy to be invariant to scaling. In addition, a statistical algorithm was also proposed, which can detect the given shape effectively and supply important premise to position hailstorm area. The experiments show that the method can not only acquire high processing speed and high accuracy and robustness of the template matching, but also position the hail area accurately.