import cv2
import os
def cutimage(dir,suffix):
 for root,dirs,files in os.walk(dir):
  for file in files:
   filepath = os.path.join(root, file)
   filesuffix = os.path.splitext(filepath)[1][1:]
   if filesuffix in suffix:  #遍历找到指定后缀的文件名["jpg",png]等
    image = cv2.imread(file) #opencv剪切图片  
    #cv2.imshow(file,image) 
    dim =(242,200)      #指定尺寸w*h
    resized =cv2.resize(image,dim,interpolation = cv2.INTER_AREA) #这里采用的插值法是INTER_LINEAR
    #cv2.imshow("resize:%s"%file,resized)
    cv2.imwrite("../cv/%s"%file,resized) #保存文件 
 cv2.waitKey(0)     #退出

suffix = ["jpg"]
dir = '.'
cutimage(dir,suffix)