json格式，比如提取轮廓，不想手动打图像分割标签的可以用这个方法。
from labelme import PY2
from labelme import QT4
from labelme.logger import logger
import base64
import io
import numpy as np
from PIL import ExifTags
# import PIL.ExifTags
from PIL import Image
# import PIL.Image
# import PIL.ImageOps
from PIL import ImageOps
import os
import os.path as osp
import jsonclass MyEncoder(json.JSONEncoder):def default(self, obj):"""只要检查到了是bytes类型的数据就把它转为str类型:param obj::return:"""if isinstance(obj, bytes):return str(obj, encoding='utf-8')return json.JSONEncoder.default(self, obj)def apply_exif_orientation(image):try:exif = image._getexif()except AttributeError:exif = Noneif exif is None:return imageexif = {ExifTags.TAGS[k]: vfor k, v in exif.items()if k in ExifTags.TAGS}orientation = exif.get('Orientation', None)if orientation == 1:# do nothingreturn imageelif orientation == 2:# left-to-right mirrorreturn ImageOps.mirror(image)elif orientation == 3:# rotate 180return image.transpose(Image.ROTATE_180)elif orientation == 4:# top-to-bottom mirrorreturn ImageOps.flip(image)elif orientation == 5:# top-to-left mirrorreturn ImageOps.mirror(image.transpose(Image.ROTATE_270))elif orientation == 6:# rotate 270return image.transpose(Image.ROTATE_270)elif orientation == 7:# top-to-right mirrorreturn ImageOps.mirror(image.transpose(Image.ROTATE_90))elif orientation == 8:# rotate 90return image.transpose(Image.ROTATE_90)else:return image#@staticmethod
def load_image_file(filename):try:image_pil = Image.open(filename)except IOError:logger.error('Failed opening image file: {}'.format(filename))return# apply orientation to image according to exifimage_pil = apply_exif_orientation(image_pil)with io.BytesIO() as f:ext = osp.splitext(filename)[1].lower()if PY2 and QT4:format = 'PNG'elif ext in ['.jpg', '.jpeg']:format = 'JPEG'else:format = 'PNG'image_pil.save(f, format=format)f.seek(0)return f.read()data = {}
path = './'
imageList=os.listdir(path)
print(imageList)for imageName in imageList:if imageName.endswith('.jpg'):imageData = load_image_file(osp.join(path,imageName))imageData=base64.b64encode(imageData).decode('utf-8') #此时imageData是unicode格式，需要转成strstr1 = imageData.encode('gbk')print(str1)data["imageData"] = str1with open('./1.json', 'w') as wf:json.dump(data, wf,cls=MyEncoder,indent=4)