old_contents: #!/usr/bin/python
  from sys import argv
  import numpy as np
  import cv2
  import cv2.cv as cv
  
  def detectCircle(imagePath):
      image = cv2.imread(imagePath)
      gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
      gray = cv2.Canny(gray, 32, 2)
      cv2.imwrite("canny.jpg", gray)
      circles = cv2.HoughCircles(gray, cv.CV_HOUGH_GRADIENT, 1, 50, 10, 50, 6, 10)
  
      if circles is not None:
          circles = np.uint16(np.around(circles)) 
          gray = cv2.cvtColor(gray, cv2.COLOR_GRAY2BGR)
          for i in circles[0,:]:
              # draw the outer circle
              cv2.circle(gray,(i[0],i[1]),i[2],(0,255,0),2)
              # draw the center of the circle
              cv2.circle(gray,(i[0],i[1]),2,(0,0,255),3)
          cv2.imwrite('circled.jpg', gray)
           
          return len(circles[0])
  
  
  if __name__ == '__main__':
      if len(argv) < 2:
          exit(1)
  
      print  detectCircle(argv[1])
  
new_contents: #!/usr/bin/python
  from sys import argv
  import numpy as np
  import cv2
  import cv2.cv as cv
  
  def detectCircle(imagePath):
      image = cv2.imread(imagePath)
      gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
      gray = cv2.Canny(gray, 32, 2)
      cv2.imwrite("canny.jpg", gray)
      circles = cv2.HoughCircles(gray, cv.CV_HOUGH_GRADIENT, 1, 10, np.array([]), 10, 20, 6, 20)
  
      if circles is not None:
          circles = np.uint16(np.around(circles)) 
          gray = cv2.cvtColor(gray, cv2.COLOR_GRAY2BGR)
          for i in circles[0,:]:
              # draw the outer circle
              cv2.circle(gray,(i[0],i[1]),i[2],(0,255,0),2)
              # draw the center of the circle
              cv2.circle(gray,(i[0],i[1]),2,(0,0,255),3)
          cv2.imwrite('circled.jpg', gray)
           
          return len(circles[0])
  
  
  if __name__ == '__main__':
      if len(argv) < 2:
          exit(1)
  
      print  detectCircle(argv[1])
  
subject: Fix error in RaspberryPi environment <numpy type error>.