code: def n3_bias_field_correction(image, downsample_factor=3):
      
      outimage = image.clone()
      args = [image.dimension, image, outimage, downsample_factor]
      processed_args = pargs._int_antsProcessArguments(args)
      libfn = utils.get_lib_fn('N3BiasFieldCorrection')
      libfn(processed_args)
      return outimage
docs: N3 Bias Field Correction
  
      ANTsR function: `n3BiasFieldCorrection`
  
      Arguments
      ---------
      image : ANTsImage
          image to be bias corrected
  
      downsample_factor : scalar
          how much to downsample image before performing bias correction
  
      Returns
      -------
      ANTsImage
  
      Example
      -------
      >>> import ants
      >>> image = ants.image_read( ants.get_ants_data('r16') )
      >>> image_n3 = ants.n3_bias_field_correction(image)