Merge pull request #1 from shreedhar-sde/shreedhar-sde-patch-1

Update py_houghlines.rst

Author: shreedhar-sde

source/py_tutorials/py_imgproc/py_houghlines/py_houghlines.rst

@@ -51,12 +51,13 @@ Everything explained above is encapsulated in the OpenCV function, **cv2.HoughLi
     import cv2
     import numpy as np
 
-    img = cv2.imread('dave.jpg')
+    img = cv2.imread('dave.png')
     gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
     edges = cv2.Canny(gray,50,150,apertureSize = 3)
 
     lines = cv2.HoughLines(edges,1,np.pi/180,200)
-    for rho,theta in lines[0]:
+    for line in lines:
+        rho,theta= line[0]
         a = np.cos(theta)
         b = np.sin(theta)
         x0 = a*rho