How to use the imgviz.color.get_fg_color function in imgviz

for label_i in unique_labels:
            mask = label == label_i
            if 1.0 * mask.sum() / mask.size < thresh_suppress:
                continue
            y, x = np.array(_center_of_mass(mask), dtype=int)

            if label[y, x] != label_i:
                Y, X = np.where(mask)
                point_index = np.random.randint(0, len(Y))
                y, x = Y[point_index], X[point_index]

            text = label_names[label_i]
            height, width = draw_module.text_size(
                text, size=font_size, font_path=font_path
            )
            color = color_module.get_fg_color(res[y, x])
            res = draw_module.text(
                res,
                yx=(y - height // 2, x - width // 2),
                text=text,
                color=color,
                size=font_size,
                font_path=font_path,
            )
    elif loc in ["rb", "lt"]:
        text_sizes = np.array(
            [
                draw_module.text_size(
                    label_names[l], font_size, font_path=font_path
                )
                for l in unique_labels
            ]

color: (3,) array-like
        Text RGB color in uint8.
        If None, the color is determined by background color.
        (default: None)
    aabb1, aabb2: (2,) array-like
        Coordinate of the rectangle (y_min, x_min), (y_max, x_max).
        Default is (0, 0), (height, width).

    Returns
    -------
    dst: numpy.ndarray
        Output image.

    """
    if color is None:
        color = color_module.get_fg_color(background)

    height, width = src.shape[:2]
    y1, x1, y2, x2 = text_in_rectangle_aabb(
        src=src,
        loc=loc,
        text=text,
        size=size,
        aabb1=aabb1,
        aabb2=aabb2,
        font_path=font_path,
    )

    constant_values = (
        (background[0],),
        (background[1],),
        (background[2],),