def generate_pivot_list_tt_inference(p_score,
                                     p_char_maps,
                                     f_direction,
                                     score_thresh=0.5,
                                     is_backbone=False,
                                     is_curved=True,
                                     image_id=0):
    """
    return center point and end point of TCL instance; filter with the char maps;
    """
    p_score = p_score[0]
    f_direction = f_direction.transpose(1, 2, 0)
    p_tcl_map = (p_score > score_thresh) * 1.0
    skeleton_map = thin(p_tcl_map)
    instance_count, instance_label_map = cv2.connectedComponents(
        skeleton_map.astype(np.uint8), connectivity=8)

    # get TCL Instance
    all_pos_yxs = []
    if instance_count > 0:
        for instance_id in range(1, instance_count):
            pos_list = []
            ys, xs = np.where(instance_label_map == instance_id)
            pos_list = list(zip(ys, xs))
            ### FIX-ME, eliminate outlier
            if len(pos_list) < 3:
                continue
            pos_list_sorted = sort_and_expand_with_direction_v2(
                pos_list, f_direction, p_tcl_map)
            pos_list_sorted_with_id = add_id(pos_list_sorted, image_id=image_id)
            all_pos_yxs.append(pos_list_sorted_with_id)
    return all_pos_yxs
return center point and end point of TCL instance; filter with the char maps;
pytorchocr/utils/e2e_utils/extract_textpoint_slow.py