title: Resizing and Padding Image with specific height and width in python OpenCV gives errors and inaccurate results
body: <p>So basically I have a directory with 180 images with different width and height and I would like to resize all images to 1280 by 720 here is the script which I am running</p>
  
  <pre><code>import sys
  import os
  import numpy as np
  from os import walk
  import cv2
  
  # width to resize
  width = int(sys.argv[1])
  # height to resize
  height = int(sys.argv[2])
  # location of the input dataset
  input_dir = sys.argv[3]
  # location of the output dataset
  out_dir = sys.argv[4]
  
  if len(sys.argv) != 5:
      print("Please specify width, height, input directory and output directory.")
      sys.exit(0)
  
  print("Working...")
  
  # get all the pictures in directory
  images = []
  ext = (".jpeg", ".jpg", ".png")
  
  for (dirpath, dirnames, filenames) in walk(input_dir):
    for filename in filenames:
          if filename.endswith(ext):
              images.append(os.path.join(dirpath, filename))
  
  for image in images:
      img = cv2.imread(image, cv2.IMREAD_UNCHANGED)
  
      h, w = img.shape[:2]
      pad_bottom, pad_right = 0, 0
      ratio = w / h
  
  if h &gt; height or w &gt; width:
          # shrinking image algorithm
    interp = cv2.INTER_AREA
  else:
          # stretching image algorithm
          interp = cv2.INTER_CUBIC
  
  w = width
  h = round(w / ratio)
  if h &gt; height:
          h = height
          w = round(h * ratio)
  pad_bottom = abs(height - h)
  pad_right = abs(width - w)
  
  scaled_img = cv2.resize(img, (w, h), interpolation=interp)
  padded_img = cv2.copyMakeBorder(
          scaled_img,0,pad_bottom,0,pad_right,borderType=cv2.BORDER_CONSTANT,value=[0,0,0])
  
  cv2.imwrite(os.path.join(out_dir, os.path.basename(image)), padded_img)
  
  
  print("Completed!")
  </code></pre>
  
  <p>here is the command python2.7 <code>$python resize_images.py 1280 720 '/home/train/images/bottle_1/' '/home/train/images/bottle_resize/'</code>
  which gives me error Working...
  Traceback (most recent call last):
    File "resize_images.py", line 46, in 
      h = round(w / ratio)
  ZeroDivisionError: integer division or modulo by zero</p>
  
  <p>Command for python3 <code>$python3 resize_images.py 1280 720 '/home/train/images/bottle_1/' '/home/train/images/bottle_resize/'</code> in result to this command it only resizes one image without giving any errors or warnings. So what could be the reason its not resizing and padding the images if anyone can help me thanks</p>