叠加文件夹内所有png文件 python

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import os
import cv2
import matplotlib.pyplot as plt

PATH = "./1" #文件路径
i = 0
#子文件夹路径
img1=0
for parent, dirs, files in os.walk(PATH):
    for file in files:
            if not file.endswith('.png'):
                 continue
            img= cv2.imread(os.path.join(parent, file))
            if i==0:
                img1=img
                imgadd1=img
                i = i + 1
                continue
            # img = cv2.resize(img, (img1.shape[1], img1.shape[0]))
            imgadd1 = img1+img # cv2.add(img, img1)
            img1=imgadd1
            i = i + 1
            print(i)
plt.imshow(imgadd1)