How to use the kraken.lib.morph.select_regions function in kraken

def compute_separators_morph(binary: np.array, scale: float,
                             sepwiden: int = 10, maxcolseps: int = 2) -> np.array:
    """Finds vertical black lines corresponding to column separators."""
    logger.debug('Finding vertical black column lines')
    d0 = int(max(5, scale/4))
    d1 = int(max(5, scale)) + sepwiden
    thick = morph.r_dilation(binary, (d0, d1))
    vert = morph.rb_opening(thick, (10*scale, 1))
    vert = morph.r_erosion(vert, (d0//2, sepwiden))
    vert = morph.select_regions(vert, sl.dim1, min=3, nbest=2*maxcolseps)
    vert = morph.select_regions(vert, sl.dim0, min=20*scale, nbest=maxcolseps)
    return vert

def compute_separators_morph(binary: np.array, scale: float,
                             sepwiden: int = 10, maxcolseps: int = 2) -> np.array:
    """Finds vertical black lines corresponding to column separators."""
    logger.debug('Finding vertical black column lines')
    d0 = int(max(5, scale/4))
    d1 = int(max(5, scale)) + sepwiden
    thick = morph.r_dilation(binary, (d0, d1))
    vert = morph.rb_opening(thick, (10*scale, 1))
    vert = morph.r_erosion(vert, (d0//2, sepwiden))
    vert = morph.select_regions(vert, sl.dim1, min=3, nbest=2*maxcolseps)
    vert = morph.select_regions(vert, sl.dim0, min=20*scale, nbest=maxcolseps)
    return vert