将xml文件转成txt的方法（从xml文件中提取需要的标签信息到txt文件）

- 日理万妓 2023-02-25 02:27 27阅读 0赞

import os
    import xml.etree.ElementTree as ET
    from decimal import Decimal
     
    dirpath = 'F:\\NJtech2\\robomaster\\DJI\\robomasterFinalTournament\\image_annotation'  # 原来存放xml文件的目录
    newdir = 'F:\\NJtech2\\robomaster\\DJI\\robomasterFinalTournament\\labels'  # 修改label后形成的txt目录
     
    if not os.path.exists(newdir):
        os.makedirs(newdir)
     
    for fp in os.listdir(dirpath):
     
        root = ET.parse(os.path.join(dirpath, fp)).getroot()
     
        xmin, ymin, xmax, ymax = 0, 0, 0, 0
        sz = root.find('size')
        width = float(sz[0].text)
        height = float(sz[1].text)
        filename = root.find('filename').text
        print(fp)
        with open(os.path.join(newdir, fp.split('.')[0] + '.txt'), 'a+') as f:
            for child in root.findall('object'):  # 找到图片中的所有框
     
                sub = child.find('bndbox')  # 找到框的标注值并进行读取
                sub_label = child.find('name')
                xmin = float(sub[0].text)
                ymin = float(sub[1].text)
                xmax = float(sub[2].text)
                ymax = float(sub[3].text)
                try:  # 转换成yolov的标签格式，需要归一化到（0-1）的范围内
                    x_center = Decimal(str(round(float((xmin + xmax) / (2 * width)),6))).quantize(Decimal('0.000000'))
                    y_center = Decimal(str(round(float((ymin + ymax) / (2 * height)),6))).quantize(Decimal('0.000000'))
                    w = Decimal(str(round(float((xmax - xmin) / width),6))).quantize(Decimal('0.000000'))
                    h = Decimal(str(round(float((ymax - ymin) / height),6))).quantize(Decimal('0.000000'))
                    print(str(x_center) + ' ' + str(y_center)+ ' '+str(w)+ ' '+str(h))
                    #读取需要的标签
                    if sub_label.text == 'armor':
                        f.write(' '.join([str(0), str(x_center), str(y_center), str(w), str(h) + '\n']))
    ''' 有其他标签选用 if sub_label.text == 'xxx': f.write(' '.join([str(1), str(x_center), str(y_center), str(w), str(h) + '\n'])) if sub_label.text == 'xxx': f.write(' '.join([str(2), str(x_center), str(y_center), str(w), str(h) + '\n'])) '''
                except ZeroDivisionError:
                    print(filename, '的 width有问题')
     
                # with open(os.path.join(newdir, fp.split('.')[0] + '.txt'), 'a+') as f:
                # f.write(' '.join([str(2), str(x_center), str(y_center), str(w), str(h) + '\n']))