import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(1):
    ret, frame = cap.read()
    img = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    img = cv2.medianBlur(img,5)
    cimg = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)

    circles = cv2.HoughCircles(img,cv2.cv.CV_HOUGH_GRADIENT,1,20,param1=50,param2=30,minRadius=30,maxRadius=70)
    print type( circles)
    if circles is not None:
      circles = np.uint16(np.around(circles))
      for i in circles[0,:]:
    	# draw the outer circle
    	cv2.circle(cimg,(i[0],i[1]),i[2],(0,255,0),2)
    	# draw the center of the circle
    	cv2.circle(cimg,(i[0],i[1]),2,(0,0,255),3)

    cv2.imshow('frame o',cimg)
    cv2.imshow('frame',frame)
    k = cv2.waitKey(30) & 0xff
    if k == 27:
        break

cap.release()
cv2.destroyAllWindows()