python给图像加上mask,并提取mask区域实例

#coding:utf-8
import os
import cv2
import numpy as np

def add_mask2image_binary(images_path, masks_path, masked_path):
# Add binary masks to images
  for img_item in os.listdir(images_path):
    print(img_item)
    img_path = os.path.join(images_path, img_item)
    img = cv2.imread(img_path)
    mask_path = os.path.join(masks_path, img_item[:-4]+'.png') # mask是.png格式的，image是.jpg格式的
    mask = cv2.imread(mask_path, cv2.IMREAD_GRAYSCALE) # 将彩色mask以二值图像形式读取
    masked = cv2.add(img, np.zeros(np.shape(img), dtype=np.uint8), mask=mask) #将image的相素值和mask像素值相加得到结果
    cv2.imwrite(os.path.join(masked_path, img_item), masked)
images_path = '/home/xinan/cat_test/image/'
masks_path = '/home/xinan/cat_test/catmask/'
masked_path = '/home/xinan/cat_test/masked/'
add_mask2image_binary(images_path, masks_path, masked_path)