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How to recognize the image that have a circle ?

Hi everyone, After using InrangeS() function to seperate the green area from an image, I get a binary image contain white and black area. In white area, I don't know how to recognize that they're not circle or they're circle. I'm very grateful if everyone help me to solve this problem. I'll enclose the image I get after using Hough transform for everyone :) Thanks a lotC:\fakepath\image.png