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pascal_voc.py
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pascal_voc.py
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import argparse
import os.path as osp
import xml.etree.ElementTree as ET
import mmcv
import numpy as np
from mmdet.core import voc_classes
label_ids = {name: i + 1 for i, name in enumerate(voc_classes())}
def parse_xml(args):
xml_path, img_path = args
tree = ET.parse(xml_path)
root = tree.getroot()
size = root.find('size')
w = int(size.find('width').text)
h = int(size.find('height').text)
bboxes = []
labels = []
bboxes_ignore = []
labels_ignore = []
for obj in root.findall('object'):
name = obj.find('name').text
label = label_ids[name]
difficult = int(obj.find('difficult').text)
bnd_box = obj.find('bndbox')
bbox = [
int(bnd_box.find('xmin').text),
int(bnd_box.find('ymin').text),
int(bnd_box.find('xmax').text),
int(bnd_box.find('ymax').text)
]
if difficult:
bboxes_ignore.append(bbox)
labels_ignore.append(label)
else:
bboxes.append(bbox)
labels.append(label)
if not bboxes:
bboxes = np.zeros((0, 4))
labels = np.zeros((0, ))
else:
bboxes = np.array(bboxes, ndmin=2) - 1
labels = np.array(labels)
if not bboxes_ignore:
bboxes_ignore = np.zeros((0, 4))
labels_ignore = np.zeros((0, ))
else:
bboxes_ignore = np.array(bboxes_ignore, ndmin=2) - 1
labels_ignore = np.array(labels_ignore)
annotation = {
'filename': img_path,
'width': w,
'height': h,
'ann': {
'bboxes': bboxes.astype(np.float32),
'labels': labels.astype(np.int64),
'bboxes_ignore': bboxes_ignore.astype(np.float32),
'labels_ignore': labels_ignore.astype(np.int64)
}
}
return annotation
def cvt_annotations(devkit_path, years, split, out_file):
if not isinstance(years, list):
years = [years]
annotations = []
for year in years:
filelist = osp.join(devkit_path,
'VOC{}/ImageSets/Main/{}.txt'.format(year, split))
if not osp.isfile(filelist):
print('filelist does not exist: {}, skip voc{} {}'.format(
filelist, year, split))
return
img_names = mmcv.list_from_file(filelist)
xml_paths = [
osp.join(devkit_path,
'VOC{}/Annotations/{}.xml'.format(year, img_name))
for img_name in img_names
]
img_paths = [
'VOC{}/JPEGImages/{}.jpg'.format(year, img_name)
for img_name in img_names
]
part_annotations = mmcv.track_progress(parse_xml,
list(zip(xml_paths, img_paths)))
annotations.extend(part_annotations)
mmcv.dump(annotations, out_file)
return annotations
def parse_args():
parser = argparse.ArgumentParser(
description='Convert PASCAL VOC annotations to mmdetection format')
parser.add_argument('devkit_path', help='pascal voc devkit path')
parser.add_argument('-o', '--out-dir', help='output path')
args = parser.parse_args()
return args
def main():
args = parse_args()
devkit_path = args.devkit_path
out_dir = args.out_dir if args.out_dir else devkit_path
mmcv.mkdir_or_exist(out_dir)
years = []
if osp.isdir(osp.join(devkit_path, 'VOC2007')):
years.append('2007')
if osp.isdir(osp.join(devkit_path, 'VOC2012')):
years.append('2012')
if '2007' in years and '2012' in years:
years.append(['2007', '2012'])
if not years:
raise IOError('The devkit path {} contains neither "VOC2007" nor '
'"VOC2012" subfolder'.format(devkit_path))
for year in years:
if year == '2007':
prefix = 'voc07'
elif year == '2012':
prefix = 'voc12'
elif year == ['2007', '2012']:
prefix = 'voc0712'
for split in ['train', 'val', 'trainval']:
dataset_name = prefix + '_' + split
print('processing {} ...'.format(dataset_name))
cvt_annotations(devkit_path, year, split,
osp.join(out_dir, dataset_name + '.pkl'))
if not isinstance(year, list):
dataset_name = prefix + '_test'
print('processing {} ...'.format(dataset_name))
cvt_annotations(devkit_path, year, 'test',
osp.join(out_dir, dataset_name + '.pkl'))
print('Done!')
if __name__ == '__main__':
main()