def bounding_box(img):
    r"""
    Return the bounding box incorporating all non-zero values in the image.
    
    Parameters
    ----------
    img : array_like
        An array containing non-zero objects.
        
    Returns
    -------
    bbox : a list of slicer objects defining the bounding box
    """
    locations = numpy.argwhere(img)
    mins = locations.min(0)
    maxs = locations.max(0) + 1
    return [slice(x, y) for x, y in zip(mins, maxs)]