code: def blurring_kernel(shape=None):
      
      # TODO: Store data in some ODL controlled url
      name = 'motionblur.mat'
      url = URL_CAM + name
      dct = get_data(name, subset=DATA_SUBSET, url=url)
  
      return convert(255 - dct['im'], shape, normalize='sum')
docs: Blurring kernel for convolution simulations.
  
      The kernel is scaled to sum to one.
  
      Returns
      -------
      An image with the following properties:
          image type: gray scales
          size: [100, 100] (if not specified by `size`)
          scale: [0, 1]
          type: float64