def binary_dilation(x, radius=<NUM_LIT:3>):
mask = disk(radius)<EOL>x = _binary_dilation(x, selem=mask)<EOL>return x<EOL>
Return fast binary morphological dilation of an image.
    see `skimage.morphology.binary_dilation <http://scikit-image.org/docs/dev/api/skimage.morphology.html#skimage.morphology.binary_dilation>`__.

    Parameters
    -----------
    x : 2D array
        A binary image.
    radius : int
        For the radius of mask.

    Returns
    -------
    numpy.array
        A processed binary image.