How to crop circles (found with Hough Transform) in OpenCV?

Question

I\'m using the code from the page. It works very well and I get a circle that I am looking for. All my image have only 1 circle and I have modified parameters of HoughCirc

Answer 1

To crop circle after circles=HoughCircles(...)

if len(circles) == 1:
    x, y, r = circles[0][0]
    print x, y, r
    mask = np.zeros((w0,h0),dtype=np.uint8)
    cv2.circle(mask,(x,y),r,(255,255,255),-1,8,0)
    #cv2.imwrite(argv[2],mask)
    out = img*mask
    white = 255-mask
    cv2.imwrite(argv[2],out+white)