python opencv 에서 그림 의 크기 를 대량으로 바 꾸 는 방법

import cv2
import os
#            
def resize_image(image, height = 640, width = 480):
  top, bottom, left, right = (0,0,0,0)
  
  #       
  h, w, _ = image.shape
  
  #          ，       
  longest_edge = max(h,w)
  
  #                      (   padding，   padding 0，     padding)
  if h < longest_edge:
    dh = longest_edge - h
    top = dh // 2
    bottom = dh - top
  elif w < longest_edge:
    dw = longest_edge - w
    left = dw // 2
    right = dw - left
  else:
    pass # pass    ，             。pass      ，        。
  
  # RGB  
  BLACK = [0,0,0]
  #      padding，    、   
  # top, bottom, left, right          ，cv2.BORDER_CONSTANT   border type，          
  constant = cv2.copyMakeBorder(image, top, bottom, left, right, cv2.BORDER_CONSTANT, value = BLACK)
  #            ，             ，      
  return cv2.resize(constant, (height, width))

def read__image(path_name):
  num = 0 
  for dir_image in os.listdir(path_name): # os.listdir()                            
    full_path = os.path.abspath(os.path.join(path_name,dir_image)) 
    
    if os.path.isdir(full_path): #      ，      
      read_training_data(full_path)
    else: #      
      if dir_image.endswith('.JPG'):
        image = cv2.imread(full_path)
        image = resize_image(image)
        #             
        image_name = '%s%d.jpg' % ('resize_image',num) #                ，    imwrite       
        cv2.imwrite(image_name, image)
        num = num + 1

if __name__=='__main__':
  read__image('C:/Users/baideguo/dataset/JPEGImages/')