python+opencv 读取文件夹下的所有图像并批量保存ROI的方法

import cv2
import os
 
import numpy as np
 
root_path = "I:/Images/2017_08_03/"
dir = root_path+"images"+"/"
count = 0
for root,dir,files in os.walk(dir):
 for file in files:
  srcImg = cv2.imread(root_path+"images"+"/"+str(file))
  roiImg = srcImg[36:521, 180:745]
  cv2.imwrite(root_path+"Image"+"/"+str(file),roiImg)
  count +=1
  if count%400==0:
   print count