title: Unable to send plot to http://127.0.0.1:63342
body: <p>I am facing an error ie to send plot to a particular IP address using python, numpy and matplotlob. I am attaching snippet which I have tried till now.</p>
  <p><strong>Python</strong></p>
  <pre><code>     import numpy as np
       import cv2
       from matplotlib import pyplot as plt
       img = cv2.imread('ml.png', 1)
       gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
  
  
  
      img2 = cv2.imshow('img', img)
      cv2.waitKey(0)
      corners = cv2.goodFeaturesToTrack(gray, 30, 0.01, 10)
       corners = np.int0(corners)
  
      for i in corners:
      x, y = i.ravel()
      cv2.circle(img, (x, y), 10, 50, 0)
      plt.imshow(img), plt.show()
      MIN_MATCHES = 15
      cap = cv2.imread('mario.png', 0)
       model = cv2.imread('mario 3d.jpg', 0)
  
      # create brute force  matcher object
      bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
      # Compute model keypoints and its descriptors
      kp_model = cv2.goodFeaturesToTrack(model, 20, 0.01, 15)
      des_model = cv2.goodFeaturesToTrack(model, 20, 0.01, 15)
      # Compute scene keypoints and its descriptors
      kp_frame = cv2.goodFeaturesToTrack(cap, 20, 0.01, 15)
      des_frame = cv2.goodFeaturesToTrack(cap, 20, 0.01, 15)
      # Match frame descriptors with model descriptors
      matches = bf.match(des_model, des_frame)
      # Sort them in the order of their distance
      matches = sorted(matches, key=lambda x: x.distance)
  
      if len(matches) &gt; MIN_MATCHES:
          # draw first 15 matches.
          cap = cv2.drawMatches(model, kp_model, cap, kp_frame,
                                matches[:MIN_MATCHES], 0, flags=2)
          # show result
          cv2.imshow('frame', cap)
          cv2.waitKey(0)
      else:
          print
  </code></pre>
  <p><strong>Errors:</strong></p>
  <pre><code>Error: failed to send plot to http://127.0.0.1:63342
  
  urlopen(url, buffer)    
  return opener.open(url, data, timeout)    
  response = self._open(req, data)    
  result = self._call_chain(self.handle_open, protocol, protocol +    
  result = func(*args)    
  return self.do_open(http.client.HTTPConnection, req)    
  r = h.getresponse()    
  response.begin()    
  version, status, reason = self._read_status()    
  line = str(self.fp.readline(_MAXLINE + 1), &quot;iso-8859-1&quot;)    
  return self._sock.recv_into(b)    
  ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
  Traceback (most recent call last):    
  matches = bf.match(des_model, des_frame)    
  cv2.error: OpenCV(4.3.0) C:\projects\opencv-python\opencv\modules\core\src\batch_distance.cpp:275: error: (-215:Assertion failed) type == src2.type() &amp;&amp; src1.cols == src2.cols &amp;&amp; (type == CV_32F || type == CV_8U) in function 'cv::batchDistance'
  </code></pre>