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# scipy.ndimage.interpolation.spline_filter1d

`scipy.ndimage.interpolation.``spline_filter1d`(input, order=3, axis=-1, output=<type 'numpy.float64'>)

  Calculates a one-dimensional spline filter along the given axis.

  The lines of the array along the given axis are filtered by a spline filter. The order of the spline must be >= 2 and <= 5.

  Parameters: | input : array_like The input array. order : int, optional The order of the spline, default is 3. axis : int, optional The axis along which the spline filter is applied. Default is the last axis. output : ndarray or dtype, optional The array in which to place the output, or the dtype of the returned array. Default is `numpy.float64`.
  Returns: | spline_filter1d : ndarray or None The filtered input. If output is given as a parameter, None is returned.