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turn_ezlabel_xml_to_yolo_txt.py
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turn_ezlabel_xml_to_yolo_txt.py
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# Adapted by LiaoSteve on 2020/10/18
import xml.etree.ElementTree as ET
import pickle
import os
from os import listdir, getcwd
from os.path import join
sets=[('2007', 'train_all')]
classes = ["trash"]
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(year, image_id):
# convert pascal-voc(.xml) labels to YOLO(.txt) labels
in_file = open('VOCdevkit/VOC%s/Annotations/%s.xml'%(year, image_id))
out_file = open('VOCdevkit/VOC%s/labels/%s.txt'%(year, image_id), 'w')
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('attribute').text
if cls not in classes:
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')
wd = getcwd()
num = 0
image_ids = list()
xml_ids = list()
for year, image_set in sets:
if not os.path.exists('VOCdevkit/VOC%s/labels/'%(year)):
os.makedirs('VOCdevkit/VOC%s/labels/'%(year))
image_ids = os.listdir('./VOCdevkit/VOC%s/JPEGImages/'%(year))
xml_ids = os.listdir('./VOCdevkit/VOC%s/Annotations/'%(year))
image_ids.sort()
xml_ids.sort()
if not len(image_ids) ==len(xml_ids):
raise RuntimeError(f'number of images and .xml files not equal.')
for image_id in image_ids:
convert_annotation(year, os.path.splitext(image_id)[0])
num += 1
print(f'JPEGImages: {len(image_ids)} images')
print(f'turn {len(xml_ids)} .xml files to {num} .txt files')
print('DONE')