xml转换成txt （VOC转换为YOLO)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import copy
from lxml.etree import Element, SubElement, tostring, ElementTree

import xml.etree.ElementTree as ET
import pickle
import os
from os import listdir, getcwd
from os.path import join

def convet(size,box):
    x_center = (box[0] + box[1]) / 2.0
    y_center = (box[2] + box[3]) / 2.0
    x = x_center / size[0]
    y = y_center / size[1]
    w = (box[1] - box[0]) / size[0]
    h = (box[3] - box[2]) / size[1]
    return (x,y,w,h)

def convert_annotation(xml_path, save_txt_path, classes):
    xml_files = os.listdir(xml_path)
    print(xml_path)
    for xml_name in xml_files:
        print(xml_name)
        xml_file = os.path.join(xml_path,xml_name)
        out_txt_path = os.path.join(save_txt_path,xml_name.split('.')[0]+'.txt')
        out_txt_f = open(out_txt_path,'w')
        tree = ET.parse(xml_file)
        root = tree.getroot()
        size = root.find('size')
        w = int(size.find('width').text)
        h=  int(size.find('height').text)

        for obj in root.iter('object'):
            difficult = obj.find('difficult').text
            cls = obj.find('name').text
            if cls not in classes or int(difficult) == 1:
                continue
            cls_id = classes.index(cls)
            xmlbox = obj.find('bndbox')
            b = (float(xmlbox.find('xmin').text), float(xmlbox.find('xmax').text), float(xmlbox.find('ymin').text),
                 float(xmlbox.find('ymax').text))
            print(w,h,b)

            bb = convet((w,h),b)
            out_txt_f.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n')

if __name__ == '__main__':
    classes = ['rolled-in_scale', 'patches', 'crazing', 'pitted_surface', 'inclusion', 'scratches']
    #要抓换的voc文件路径
    xml_files = r'D:\Code\YOLO\datasets\NEU\NEU-DEF\Annotations'

    #保存的txt路径
    save_txt_files = r'D:\Code\YOLO\datasets\NEU\NEU-DEF\labels'
    convert_annotation(xml_files, save_txt_files, classes)
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