title: Python OpenCV Error: "TypeError: Image data cannot be converted to float"
body: <p>
  So I am trying to create a Python Program to detect similar details in two images using Python's OpenCV.  I have the two images and they are in my current directory, and they exist (see the code in lines 6-17).  But I am getting the following error when I try running it.</p>
  
  
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  import cv2
  import os
  
  path1 = "WIN_20171207_13_51_33_Pro.jpg"
  path2 = "WIN_20171207_13_51_43_Pro.jpg"
  
  if os.path.isfile(path1):
      img1 = cv2.imread('WIN_20171207_13_51_33_Pro.jpeg',0)
  else:
      print ("The file " + path1 + " does not exist.")
  
  if os.path.isfile(path2):
      img2 = cv2.imread('WIN_20171207_13_51_43_Pro.jpeg',0)
  else:
      print ("The file " + path2 + " does not exist.")
  
  orb = cv2.ORB_create()
  
  kpl1, des1 = orb.detectAndCompute(img1,None)
  kpl2, des2 = orb.detectAndCompute(img2,None)
  
  bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
  
  matches = bf.match(des1, des2)
  matches = sorted(matches, key=lambda x:x.distance)
  
  img3 = cv2.drawMatches(img1,kpl1,img2,kpl2,matches[:10],None, flags=2)
  
  plt.imshow (img3)
  plt.show()
  </code></pre>
  
  
  
  <p>
  Here is the error I keep on getting...</p>
  
  <pre><code>Traceback (most recent call last):
  
  
  File "C:\Users\jweir\source\repos\BruteForceFeatureDetection\BruteForceFeatureDetection\BruteForceFeatureDetection.py", line 31, in &lt;module&gt;
      plt.imshow (img3)
    File "C:\Program Files\Python36\lib\site-packages\matplotlib\pyplot.py", line 3080, in imshow
      **kwargs)
    File "C:\Program Files\Python36\lib\site-packages\matplotlib\__init__.py", line 1710, in inner
      return func(ax, *args, **kwargs)
    File "C:\Program Files\Python36\lib\site-packages\matplotlib\axes\_axes.py", line 5194, in imshow
      im.set_data(X)
    File "C:\Program Files\Python36\lib\site-packages\matplotlib\image.py", line 600, in set_data
      raise TypeError("Image data cannot be converted to float")
  TypeError: Image data cannot be converted to float
  </code></pre>
  
  <p>Can someone please explpain to me why I am getting this error, what it means, and how to fix it.</p>