message: Remove divide by 1000
  because t = (time.time() - t) will return seconds,  dividing by 1000 to obtain seconds will be incorrect.
diff: @@ -69,7 +69,7 @@ def main(argv):
  dst0 = sharpen(src)
  - t = (time.time() - t) / 1000
  + t = (time.time() - t)
  print("Hand written function time passed in seconds: %s" % t)
  cv.imshow("Output", dst0)
  @@ -86,7 +86,7 @@ def main(argv):
  # ddepth = -1, means destination image has depth same as input image
  ## [filter2D]
  - t = (time.time() - t) / 1000
  + t = (time.time() - t)
  print("Built-in filter2D time passed in seconds: %s" % t)
  cv.imshow("Output", dst1)
  