title: TypeError: src is not a numpy array
body: <p><strong>Error Displayed</strong> </p>
  
  <p>Traceback (most recent call last):</p>
  
  <pre><code>  File "C:\Python27\sample\sample1.py", line 47, in &lt;module&gt;
     morphOps([threshold])
    File "C:\Python27\sample\sample1.py", line 20, in morphOps
     cv2.erode(thresh,thresh,erodeElement);
  TypeError: src is not a numpy array
  </code></pre>
  
  <p><strong>Code</strong></p>
  
  <pre><code>import cv2 
  
  import numpy as np
  
  H_MIN = 0;
  H_MAX = 256; 
  S_MIN = 0;
  S_MAX = 256;  
  V_MIN = 0;  
  V_MAX = 256;
  
  def morphOps(thresh):     
      #create structuring element that will be used to "dilate" and "erode" image.
      #the element chosen here is a 3px by 3px rectangle
  
      erodeElement = cv2.getStructuringElement( cv2.MORPH_RECT, (3,3));
      #dilate with larger element so make sure object is nicely visible
      dilateElement = cv2.getStructuringElement( cv2.MORPH_RECT,(8,8));
  
      cv2.erode(thresh,thresh,erodeElement);
      cv2.erode(thresh,thresh,erodeElement);
  
      cv2.dilate(thresh,thresh,dilateElement);
      cv2.dilate(thresh,thresh,dilateElement);
  
  videoCapture = cv2.VideoCapture('E:/Intern MNIT(gait motions)/Sample video.mp4')
  fps = videoCapture.get(cv2.cv.CV_CAP_PROP_FPS)
  print 'Frame per seconds :'; print fps
  while 1 :
       _,cameraFeed = videoCapture.read()    
       HSV = cv2.cvtColor(cameraFeed,cv2.COLOR_BGR2HSV);  
  
       # define range of color in HSV 
       lower = np.array([0,0,0])
       upper = np.array([256,256,256])
  
       #thresholding image
       threshold = cv2.inRange(HSV,lower,upper)
  
       morphOps([threshold])
  </code></pre>