opencv识别封闭区域 并标记该区域

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Author  : zhibo.wang
# E-mail  : d_1206@qq.com
# Time    : 2018/8/21 17:24
# Des     :

# import imutils
# import numpy as np
import cv2
from PIL import Image, ImageDraw, ImageFont
from skimage.measure import regionprops
# from shapely.geometry import Point, Polygon


img = cv2.imread('1.png', 0)
ret, labels = cv2.connectedComponents(img)
props = regionprops(labels)
im = Image.open("1.png")
draw = ImageDraw.Draw(im)
for i in props:
    # print(i.coords)
    # print(props.index(i), i.centroid)
    draw.text((i.centroid[-1], i.centroid[0]), "{0}".format(props.index(i)), fill=(255,25,0))#,font=ttfont)
im.show()