xml格式转成txt格式以适应yolo喂入数据格式

xml格式转成txt格式以适应yolo喂入数据格式：

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

image_set = 'train'
classes = ['aeroplane', 'bicycle', 'bird', 'boat', 'bottle', 'bus', 'car', 'cat', 'chair', 'cow', 'diningtable', 'dog',
        'horse', 'motorbike', 'person', 'pottedplant', 'sheep', 'sofa', 'train', 'tvmonitor']

def convert(size, box):
    dw = 1./(size[0])
    dh = 1./size[1]
    x = (box[0]+box[1])/2.0 - 1
    y = (box[2]+box[3])/2.0 - 1
    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(image_id):
    in_file = open('Annotations/%s.xml'%image_id)
    out_file = open('labels/%s.txt'%image_id)
    tree = ET.parse(in_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'):
        cls = obj.find('name').text
        if cls not in classes == 1:
            continue
        cls_id = classes.index(cls)
        xmlbox = obj.find('bndbox')
        b = (float(xmlbox.find('xmin').text), float(xmlbox.find('max').text), float(xmlbox.find('ymin').text), float(xmlbox.find('ymax').text))
        bb = convert((w,b), b)
        out_file.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n')

 wd = getcwd()

if not os.path.exists('labels'):
     os.makedirs('labels')
image_ids = open('ImageSets/Main/%s.txt'%image_set).read().strip().split()
list_file = open('%s'%image_set, 'w')
for image_id in image_ids:
    list_file.write('JPEGImages/%s.jpg\n'%image_id)
    print(image_id)
    convert_annotation(image_id)
list_file.close()

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