title: error: C:\projects\opencv-python\opencv\modules\imgproc\src\imgwarp.cpp:3483: error: (-215) ssize.width > 0 && ssize.height > 0 in function cv::resize
body: <p>I have a error as mentioned in the question in the below code for resize function of cv2. I have referred here
  <a href="https://stackoverflow.com/questions/47172770/error-215-ssize-width-0-ssize-height-0-in-function-resize">error: (-215) ssize.width &gt; 0 &amp;&amp; ssize.height &gt; 0 in function resize</a></p>
  
  <p>But I think the image is correctly loaded. So I would appreciate some help. </p>
  
  <pre><code>for rect in rects:
          # Draw the rectangles
          cv2.rectangle(im, (rect[0], rect[1]), (rect[0] + rect[2], rect[1] + rect[3]), (0, 255, 0), 3) 
          # Make the rectangular region around the digit
          leng = int(rect[3] * 1.6)
          pt1 = int(rect[1] + rect[3] // 2 - leng // 2)
          pt2 = int(rect[0] + rect[2] // 2 - leng // 2)
          roi = im_th[pt1:pt1+leng, pt2:pt2+leng]
          print(roi.shape)
          # Resize the image
          roi = cv2.resize(roi, None, fx=28, fy=28, interpolation=cv2.INTER_LINEAR)
          roi = cv2.dilate(roi, (3, 3))
          # Calculate the HOG features
          roi_hog_fd = hog(roi, orientations=9, pixels_per_cell=(14, 14), cells_per_block=(1, 1), visualise=False)
          roi_hog_fd = pp.transform(np.array([roi_hog_fd], 'float64'))
          nbr = clf.predict(roi_hog_fd)
          cv2.putText(im, str(int(nbr[0])), (rect[0], rect[1]),cv2.FONT_HERSHEY_DUPLEX, 2, (0, 255, 255), 3)
  </code></pre>