代码使用说明
下图中只有 train_annotation(保存xml) 、train_labels(保存txt) 两个文件夹在代码中调用,这里只是对训练集的 xml 进行 txt 转换的示例,如果想要对测试集也进行转换,那么就还需要 test_annotation、test_labels 两个文件夹
完整代码
import xml.etree.ElementTree as ET
import os
from os import getcwd
from os.path import join
import glob
sets = ['train','test']#分别保存训练集和测试集的文件夹名称
classes = ['1','2','3','4','5','6']#标注时的标签
''' xml中框的左上角坐标和右下角坐标(x1,y1,x2,y2) 》》txt中的中心点坐标和宽和高(x,y,w,h),并且归一化 '''
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(data_dir,imageset,image_id):
in_file = open(data_dir+'/%s_annotations/%s.xml' % (imageset,image_id)) #读取xml
out_file = open(data_dir+'/%s_labels/%s.txt' % (imageset,image_id), 'w') #保存txt
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'):
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)#获取类别索引
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('%.6f'%a) for a in bb]) + '\n')
wd = getcwd()
print(wd)#当前路径
data_dir='F:/Postgraduate_time/label_fish'
for image_set in sets:
image_ids=[]
for x in glob.glob(data_dir+'/%s_annotations'%image_set+'/*.xml'):
print(x)
image_ids.append(os.path.basename(x)[:-4])
print('\n%s数量:'%image_set,len(image_ids))#确认数量
i=0
for image_id in image_ids:
i=i+1
convert_annotation(data_dir,image_set,image_id)
print("%s 数据:%s/%s文件完成!"% (image_set,i,len(image_ids)))
print("Done!!!")