单个文件处理

import cv2
import os
import xml.etree.ElementTree as ET

def resize_image_and_xml(image_path, xml_path, target_size):    
    # 读取图像
    image = cv2.imread(image_path)
    
    # 获取图像原始尺寸
    original_height, original_width = image.shape[:2]
    
    # 计算缩放比例
    scale_x = target_size / original_width
    scale_y = target_size / original_height
    
    # 缩放图像
    resized_image = cv2.resize(image, (target_size, target_size))
    
    # 保存缩放后的图像
    cv2.imwrite('resized_image.jpg', resized_image)
    
    # 修改XML文件中的尺寸信息
    tree = ET.parse(xml_path)
    root = tree.getroot()
    
    # 修改尺寸信息
    size_tag = root.find('size')
    size_tag.find('width').text = str(target_size)
    size_tag.find('height').text = str(target_size)
    
    # 修改bounding box的坐标信息
    for obj in root.findall('object'):
        bbox = obj.find('bndbox')
        bbox.find('xmin').text = str(int(float(bbox.find('xmin').text) * scale_x))
        bbox.find('xmax').text = str(int(float(bbox.find('xmax').text) * scale_x))
        bbox.find('ymin').text = str(int(float(bbox.find('ymin').text) * scale_y))
        bbox.find('ymax').text = str(int(float(bbox.find('ymax').text) * scale_y))
    
    # 保存修改后的XML文件
    tree.write('resized_annotation.xml')

# 用法示例
image_path = r'C:\Users\GuoQingru\Downloads\pp_fall\temp\fall_0.jpg'
xml_path = r'C:\Users\GuoQingru\Downloads\pp_fall\temp\fall_0.xml'
target_size = 640

resize_image_and_xml(image_path, xml_path, target_size)

批处理脚本

import cv2
import os
import xml.etree.ElementTree as ET

def resize_image_and_xml(images_root_old,xml_root_old,image_root_new,xml_root_new,image_name, target_size):    
    # 读取图像
    image_path=os.path.join(images_root_old,image_name)
    image = cv2.imread(image_path)
    
    # 获取图像原始尺寸
    original_height, original_width = image.shape[:2]
    
    # 计算缩放比例
    scale_x = target_size / original_width
    scale_y = target_size / original_height
    
    # 缩放图像
    resized_image = cv2.resize(image, (target_size, target_size))
    
    # 保存缩放后的图像
    cv2.imwrite(os.path.join(image_root_new,image_name), resized_image)
    
    # 修改XML文件中的尺寸信息
    tree = ET.parse(os.path.join(xml_root_old,os.path.splitext(image_name)[0]+'.xml'))
    root = tree.getroot()
    
    # 修改尺寸信息
    size_tag = root.find('size')
    size_tag.find('width').text = str(target_size)
    size_tag.find('height').text = str(target_size)
    
    # 修改bounding box的坐标信息
    for obj in root.findall('object'):
        bbox = obj.find('bndbox')
        bbox.find('xmin').text = str(int(float(bbox.find('xmin').text) * scale_x))
        bbox.find('xmax').text = str(int(float(bbox.find('xmax').text) * scale_x))
        bbox.find('ymin').text = str(int(float(bbox.find('ymin').text) * scale_y))
        bbox.find('ymax').text = str(int(float(bbox.find('ymax').text) * scale_y))
    
    # 保存修改后的XML文件
    tree.write(os.path.join(xml_root_new,os.path.splitext(image_name)[0]+'.xml'))



# 用法示例
target_size = 640

# 原先的图像存放路径
images_root_old=r'C:\Users\GuoQingru\Downloads\pp_fall\JEPGImages'
# 原先的xml文件存放路径
xml_root_old=r'C:\Users\GuoQingru\Downloads\pp_fall\Annotations'


# 生成的图像存放路径
image_root_new=r'C:\Users\GuoQingru\Downloads\pp_fall\JEPGImages_640'
# 生成的xml存放路径
xml_root_new=r'C:\Users\GuoQingru\Downloads\pp_fall\Annotations_640'

images_list=[]
for image_name in os.listdir(images_root_old):
    images_list.append(image_name)


for image_name in images_list:

    resize_image_and_xml(images_root_old,xml_root_old,image_root_new,xml_root_new,image_name, target_size)