how to apply a variable thresholding after using sobel filter?

I want to detect rain drops from images, for that I have detected edges using Sobel filter and after that to get binary image I wanted to threshold the edge detected image. Same threshold values can't be applied to all the images.Follwing to this I have to calculate area or pixels occupied by that drops. Could someone help me?

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2016 年 11 月 19 日

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