VOC标签转化为YOLO标签

参考darknet自带的voc_label.py

import xml.etree.ElementTree as ET
import pickle
import os
from os import listdir, getcwd
from os.path import join classes = ["dog", "cat"] 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(rootpath,xmlname):
xmlpath = rootpath + '/labels'
xmlfile = os.path.join(xmlpath,xmlname)
with open(xmlfile, "r") as in_file:
txtname = xmlname[:-4]+'.txt'
txtpath = rootpath + '/labelYOLOs'
if not os.path.exists(txtpath):
os.makedirs(txtpath)
txtfile = os.path.join(txtpath,txtname)
with open(txtfile, "w+") as out_file:
tree=ET.parse(in_file)
root = tree.getroot()
size = root.find('size')
w = int(size.find('width').text)
h = int(size.find('height').text)
out_file.truncate()
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))
bb = convert((w,h), b)
out_file.write(str(cls_id) + " " + " ".join([str(a) for a in bb]) + '\n') if __name__ == "__main__":
rootpath='/home/aimhabo/YOLOv3SMP/data'
xmlpath=rootpath+'/labels'
list=os.listdir(xmlpath)
for i in range(0,len(list)) :
path = os.path.join(xmlpath,list[i])
if ('.xml' in path)or('.XML' in path):
convert_annotation(rootpath,list[i])
print('done', i)
else:
print('not xml file',i)
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