code: def input(self, img):
          
          img_width, img_height = img.size
  
          if self.resize:
              width, height = self.resize
              scale = min(width / img_width, height / img_height)
              img = img.resize((floor(img_width * scale),
                                floor(img_height * scale)))
              img_width, img_height = img.size
  
          if img_width < self.min_size or img_height < self.min_size:
              raise ValueError('input image is too small: {0} x {1} < {2} x {2}'
                               .format(img_width, img_height, self.min_size))
  
          return img
docs: Resize input image if necessary.
  
          Parameters
          ----------
          img : `PIL.Image`
              Input image.
  
          Raises
          ------
          ValueError
              If input image is too small.
  
          Returns
          -------
          `PIL.Image`
              Resized image or input image.