Implement edge detector.

ex1/code/Skeleton/main.py

@@ -108,7 +108,9 @@ def harrisEdges(input, response, edge_threshold=-0.01):
     ##
     ## Don't generate edges at the image border.
     result = input.copy()
-
+    edges_idx = np.argwhere(response < edge_threshold)
+    for each_pixel in edges_idx:
+        result[each_pixel[0], each_pixel[1]] = (0,0, 255)
 
     return result