xml2txt标签转换程序

电脑上的程序太多了，要逐步转移上传上来，以防丢失。

一、程序

import xml.etree.ElementTree as ET
import os

sets = []
classes = ["plaque"]  ##修改为自己的类别


def convert(size, box):
    dw = 1. / (size[0])
    dh = 1. / (size[1])
    x = (box[0] + box[1]) / 2.0
    y = (box[2] + box[3]) / 2.0
    w = box[1] - box[0]
    h = box[3] - box[2]
    x = x * dw
    w = w * dw
    y = y * dh
    h = h * dh
    return (x, y, w, h)


def convert_annotation(path, outpath):
    in_file = open(path, encoding='utf-8')
    out_file = open(outpath, 'w', encoding='utf-8')    # 最后写入的文件,必须要执行这句,不然会报错
    tree = ET.parse(in_file)
    root = tree.getroot()
    if root.find('size'):
        size = root.find('size')
        w = int(size.find('width').text)    # 偶尔xml标记出错，width或height设置为0了
        h = int(size.find('height').text)    # 需要标记出来，便于单独处理
        # 遍历目标obj
        for obj in root.iter('object'):
            # iter()方法可以递归遍历元素/树的所有子元素
            difficult = obj.find('difficult').text
            cls = obj.find('name').text
            # 如果训练标签中的品种不在程序预定品种，或者difficult = 1，跳过此object
            if cls not in classes or int(difficult) == 1:
                continue
            # 通过类别名称找到id
            cls_id = classes.index(cls)
            xmlbox = obj.find('bndbox')
            # 获取对应的bndbox的数组 = ['xmin', 'xmax', 'ymin', 'ymax']
            b = (float(xmlbox.find('xmin').text), float(xmlbox.find('xmax').text), float(xmlbox.find('ymin').text),
                 float(xmlbox.find('ymax').text))
            # 进行归一化操作
            bb = convert((w, h), b)
            # bb对应的是归一化后的(x,y,w,h)
            out_file.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n')


rootdir = 'C:/Users/CNXIGAO13/Desktop/CPR_labels'    # xml文件目录
txtdir = 'C:/Users/CNXIGAO13/Desktop/txt'    # 输出的txt文件目录
list = os.listdir(rootdir)    # 列出文件夹下所有的目录与文件
for i in range(0, len(list)):
    path = os.path.join(rootdir, list[i])
    stem = list[i].split(".")[0]
    # print(stem)
    out_path = os.path.join(txtdir, stem + '.txt')
    # print(out_path)
    convert_annotation(path, out_path)