采用图像法处理滤纸色斑测量雨滴直径。应用距离变换生成分水岭，以分水岭对滤纸色斑进行分割，获取滤纸上色斑面积，计算色斑等效直径 D ，率定自然雨滴直径 d =1.1～4.1 mm，与色斑直径关系d=0.3561× D0.7233。图像法不受色斑毛刺影响，色斑等效直径测量准确，工作效率高。%Mainly introduces a kind of measuring methods for raindrop size. On the basis of the theory of distance transformation and image segmentation ,the raindrop can be mapped to stain pixel ,and its diameter is calculated easily. According to the experiments ,the relation between the raindrop diameter (d) and the stain diameter (D) is d=0. 356 1× D 0.723 3. This image processing method is highly accurate and efficient because it is not affected by splash burr.
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