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1_voc2txt.py
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#! /usr/bin/env python
# coding=utf-8
# ================================================================
#
# Author : miemie2013
# Created date: 2020-05-20 15:35:27
# Description : Convert annotation files (voc format) into txt format.
# 将voc注解格式数据集的注解转换成txt注解格式。生成的txt注解文件在annotation目录下。
#
# ================================================================
import os
import shutil
'''
将 dataset_dir 改为你的数据集的路径。
生成的txt注解文件格式为：
图片名 物体1左上角x坐标,物体1左上角y坐标,物体1右下角x坐标,物体1右下角y坐标,物体1类别id 物体2左上角x坐标,物体2左上角y坐标,物体2右下角x坐标,物体2右下角y坐标,物体2类别id ...
train_difficult控制是否训练难例。use_default_label控制是否使用默认的类别文件。
'''
# 是否训练难例。
train_difficult = True
# train_difficult = False
# 是否使用默认的类别文件。
use_default_label = True
# use_default_label = False
dataset_dir = '../VOCdevkit/VOC2012/'
train_path = dataset_dir + 'ImageSets/Main/train.txt'
val_path = dataset_dir + 'ImageSets/Main/val.txt'
# test_path = dataset_dir + 'ImageSets/Main/test.txt'
test_path = None
annos_dir = dataset_dir + 'Annotations/'
# 保存的txt注解文件的文件名
train_txt_name = 'voc2012_train.txt'
val_txt_name = 'voc2012_val.txt'
test_txt_name = 'voc2012_test.txt'
class_names = []
class_names_ids = {}
cid_index = 0
if use_default_label:
# class_txt_name指向已有的类别文件，一行一个类别名。类别id根据这个类别文件中类别名在第几行确定。
# 如果只训练该数据集的部分类别，那么编辑该类别文件，只留下所需类别的类别名即可。
class_txt_name = 'data/voc_classes.txt'
if not os.path.exists(class_txt_name):
raise FileNotFoundError("%s does not exist!" % class_txt_name)
with open(class_txt_name, 'r', encoding='utf-8') as f:
for line in f:
cname = line.strip()
class_names.append(cname)
class_names_ids[cname] = cid_index
cid_index += 1
else: # 如果不使用默认的类别文件。则会分析出有几个类别，生成一个类别文件。
# 保存的类别文件名
class_txt_name = 'data/class_names.txt'
train_names = []
val_names = []
test_names = []
with open(train_path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
train_names.append(line)
with open(val_path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
val_names.append(line)
if test_path is not None:
with open(test_path, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
test_names.append(line)
# 创建txt注解目录
if os.path.exists('annotation/'): shutil.rmtree('annotation/')
os.mkdir('annotation/')
def write_txt(xml_names, annos_dir, txt_name, use_default_label, train_difficult, class_names, class_names_ids, cid_index):
content = ''
for xml_name in xml_names:
xml_file = '%s%s.xml'%(annos_dir, xml_name)
enter_gt = False
enter_part = False
x0, y0, x1, y1, cid = '', '', '', '', -10
difficult = 0
img_name = ''
bboxes = ''
with open(xml_file, 'r', encoding='utf-8') as f:
for line in f:
line = line.strip()
if '<filename>' in line:
if '</filename>' in line:
ss = line.split('name>')
sss = ss[1].split('</file')
img_name = sss[0]
else:
print('Error 1.')
if '<object>' in line:
if '</object>' in line:
print('Error 2.')
else:
enter_gt = True
if '</object>' in line:
if cid > -5:
if train_difficult:
bboxes += ' %s,%s,%s,%s,%d'%(x0, y0, x1, y1, cid)
else:
if difficult == 0:
bboxes += ' %s,%s,%s,%s,%d'%(x0, y0, x1, y1, cid)
x0, y0, x1, y1, cid = '', '', '', '', -10
difficult = 0
enter_gt = False
enter_part = False
if enter_gt:
if '<part>' in line: # <object>里会有<part>节点，我们要忽略<part>节点。
if '</part>' in line:
print('Error part.')
else:
enter_part = True
if '</part>' in line:
enter_part = False
if not enter_part:
if '<name>' in line:
if '</name>' in line:
ss = line.split('name>')
sss = ss[1].split('</')
cname = sss[0]
if use_default_label:
if cname not in class_names:
cid = -10
else:
cid = class_names_ids[cname]
else:
if cname not in class_names:
class_names.append(cname)
class_names_ids[cname] = cid_index
cid_index += 1
cid = class_names_ids[cname]
else:
print('Error 3.')
if '<xmin>' in line:
if '</xmin>' in line:
ss = line.split('xmin>')
sss = ss[1].split('</')
x0 = sss[0]
else:
print('Error 4.')
if '<ymin>' in line:
if '</ymin>' in line:
ss = line.split('ymin>')
sss = ss[1].split('</')
y0 = sss[0]
else:
print('Error 5.')
if '<xmax>' in line:
if '</xmax>' in line:
ss = line.split('xmax>')
sss = ss[1].split('</')
x1 = sss[0]
else:
print('Error 6.')
if '<ymax>' in line:
if '</ymax>' in line:
ss = line.split('ymax>')
sss = ss[1].split('</')
y1 = sss[0]
else:
print('Error 7.')
if '<difficult>' in line:
if '</difficult>' in line:
ss = line.split('difficult>')
sss = ss[1].split('</')
difficult = int(sss[0])
else:
print('Error 8.')
content += img_name + bboxes + '\n'
with open('annotation/%s' % txt_name, 'w', encoding='utf-8') as f:
f.write(content)
f.close()
return class_names, class_names_ids, cid_index
# train set
class_names, class_names_ids, cid_index = write_txt(train_names, annos_dir, train_txt_name,
use_default_label, train_difficult, class_names, class_names_ids, cid_index)
# val set
class_names, class_names_ids, cid_index = write_txt(val_names, annos_dir, val_txt_name,
use_default_label, train_difficult, class_names, class_names_ids, cid_index)
# test set
if test_path is not None:
class_names, class_names_ids, cid_index = write_txt(test_names, annos_dir, test_txt_name,
use_default_label, train_difficult, class_names, class_names_ids, cid_index)
if not use_default_label:
num_classes = len(class_names)
content = ''
for cid in range(num_classes):
for cname in class_names_ids.keys():
if cid == class_names_ids[cname]:
content += cname + '\n'
break
if not os.path.exists('data/'): os.mkdir('data/')
with open(class_txt_name, 'w', encoding='utf-8') as f:
f.write(content)
f.close()
print('Done.')