def find_lines(canny):
  lines = cv2.HoughLines(canny,1,np.pi/180,200)
  for rho,theta in lines[0]:
      a = np.cos(theta)
      b = np.sin(theta)
      x0 = a*rho
      y0 = b*rho
      x1 = int(x0 + 1000*(-b))
      y1 = int(y0 + 1000*(a))
      x2 = int(x0 - 1000*(-b))
      y2 = int(y0 - 1000*(a))

      cv2.line(img,(x1,y1),(x2,y2),(0,0,255),2)

  return img