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Get the average color of image inside the circle:Hough Transform

Hi, I am a newbie in opencv. I am trying to detect some cells(circular objects) in an image. I have used cv2.HoughCircles to detect multiple circles. Now I need to extract some features of the extracted circles. For that I need to find the average color of my image inside each circle. I am thinking of using the detected circles as a mask and then trying to pull out the average of all the pixels from my corresponding image. Unfortunately, I am unable to accomplish. Is it is correct way of finding the average color of my image inside each circle? Could some one help me out in this?