タグ付けされた写真をPythonで抽出する例を詳しく解説

{
 "GPSVersionID": "GPS版本",
 "GPSLatitudeRef": "南北纬",
 "GPSLatitude": "纬度",
 "GPSLongitudeRef": "东西经",
 "GPSLongitude": "经度",
 "GPSAltitudeRef": "海拔参照值",
 "GPSAltitude": "海拔",
 "GPSTimeStamp": "GPS时间戳",
 "GPSSatellites": "测量的卫星",
 "GPSStatus": "接收器状态",
 "GPSMeasureMode": "测量模式",
 "GPSDOP": "测量精度",
 "GPSSpeedRef": "速度单位",
 "GPSSpeed": "GPS接收器速度",
 "GPSTrackRef": "移动方位参照",
 "GPSTrack": "移动方位",
 "GPSImgDirectionRef": "图像方位参照",
 "GPSImgDirection": "图像方位",
 "GPSMapDatum": "地理测量资料",
 "GPSDestLatitudeRef": "目标纬度参照",
 "GPSDestLatitude": "目标纬度",
 "GPSDestLongitudeRef": "目标经度参照",
 "GPSDestLongitude": "目标经度",
 "GPSDestBearingRef": "目标方位参照",
 "GPSDestBearing": "目标方位",
 "GPSDestDistanceRef": "目标距离参照",
 "GPSDestDistance": "目标距离",
 "GPSProcessingMethod": "GPS处理方法名",
 "GPSAreaInformation": "GPS区功能变数名",
 "GPSDateStamp": "GPS日期",
 "GPSDifferential": "GPS修正"
}

import os
import time
import json
import random
import logging
import requests
import exifread
logging.basicConfig(level=logging.CRITICAL)
KEY = "169d2dd7829fe45690fabec812d05bc3"

def main():
 # 预设后缀列表
 types = ["bmp", "jpg", "tiff", "gif", "png"]
 #结果数据集合
 picex = []
 # 文件存储路径
 saves = "$" + input("| SavePath: ").strip()
 # 文件搜索路径 并遍历所有文件返回文件路径列表
 pools = jpgwalk(input("| FindPath: "), types)
 #存储目录
 savep = "%s/%s" % (os.getcwd().replace("\\", "/"), saves)
 if savep in pools:
 pools.remove(savep)
 # 遍历数据集并获取exif信息
 for path in pools:
 res = getEXIF(path)
 if res:
  picex.append(res)
 # 结果报告
 print("| Result %s" % len(picex))
 # 如果存在结果 保存结果到json并讲相关图片复制到该目录下
 if picex:
 #创建目录
 if not os.path.exists(saves):
  os.mkdir(saves)
 #生成一个4格缩进的json文件 
 with open("%s/%s.json" % (saves, saves), "wb") as f:
  f.write(json.dumps(picex, ensure_ascii=False, indent=4).encode("utf8"))
 #copy图像到该目录
 for item in picex:
  source_path = item["Filename"]
  with open("%s/%s" % (saves, source_path.split("/")[-1]), "wb") as f_in:
  with open(source_path, "rb") as f_out:
   f_in.write(f_out.read())

# 获取指导目录全部的图片路径
def jpgwalk(path, types):
 _start = time.time()
 _pools = []
 # 遍历该目录 并判断files后缀 如符合规则则拼接路径
 for _root, _dirs, _files in os.walk(path):
 _pools.extend([_root.replace("\\", "/") + "/" +
   _item for _item in _files if _item.split(".")[-1].lower() in types and "$" not in _root])
 #报告消耗时间
 print("| Find %s \n| Time %.3fs" % (len(_pools), time.time() - _start))
 return _pools

def cg(i):
 try:
 _ii = [float(eval(x)) for x in i[1:][:-1].split(', ')]
 _res = _ii[0] + _ii[1] / 60 + _ii[2] / 3600
 return _res
 except ZeropisionError:
 return 0

def getEXIF(filepath):
 #基础关键字
 _showlist = [
 'GPS GPSDOP',
 'GPS GPSMeasureMode',
 'GPS GPSAltitudeRef',
 'GPS GPSAltitude',
 'Image Software',
 'Image Model',
 'Image Make'
 ]
 #GPS关键字
 _XYlist = ["GPS GPSLatitude", "GPS GPSLongitude"]
 #时间关键字
 _TimeList = ["EXIF DateTimeOrigina", "Image DateTime", "GPS GPSDate"]
 #初始化结果字典
 _infos = {
 'Filename': filepath
 }
 with open(filepath, "rb") as _files:
 _tags = None
 # 尝试去的EXIF信息
 try:
  _tags = exifread.process_file(_files)
 except KeyError:
  return
 # 判断是否存在地理位置信息
 _tagkeys = _tags.keys()
 if _tags and len(set(_tagkeys) & set(_XYlist)) == 2 and cg(str(_tags["GPS GPSLongitude"])) != 0.0:
  for _item in sorted(_tagkeys):
  if _item in _showlist:
   _infos[_item.split()[-1]] = str(_tags[_item]).strip()
  # 经纬度取值
  _infos["GPS"] = (cg(str(_tags["GPS GPSLatitude"])) * float(1.0 if str(_tags.get("GPS GPSLatitudeRef", "N")) == "N" else -1.0),
    cg(str(_tags["GPS GPSLongitude"])) * float(1.0 if str(_tags.get("GPS GPSLongitudeRef", "E")) == "E" else -1.0))
  # 获取实体地址
  _infos["address"] = address(_infos["GPS"])
  # 获取照片海拔高度
  if "GPS GPSAltitudeRef" in _tagkeys:
  try:
   _infos["GPSAltitude"] = eval(_infos["GPSAltitude"])
  except ZeropisionError:
   _infos["GPSAltitude"] = 0
  _infos["GPSAltitude"] = "距%s%.2f米" % ("地面" if int(
   _infos["GPSAltitudeRef"]) == 1 else "海平面", _infos["GPSAltitude"])
  del _infos["GPSAltitudeRef"]
  # 获取可用时间
  _timeitem = list(set(_TimeList) & set(_tagkeys))
  if _timeitem:
  _infos["Dates"] = str(_tags[_timeitem[0]])
  return _infos

def address(gps):
 global KEY
 try:
 # 随机UA
 _ulist = [
  "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.163 Safari/535.1",
  "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0",
  "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; InfoPath.2; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; 360SE)",
  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
  "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_8; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50",
  "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; Tablet PC 2.0; .NET4.0E)",
  "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)",
  "Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20040913 Firefox/0.10",
  "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; ja) Presto/2.10.289 Version/12.00",
  "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.93 Safari/537.36"
 ]
 # 伪造header
 _header = {
  "User-Agent": random.choice(_ulist),
  "Accept": "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01",
  "Accept-Encoding": "gzip, deflate, sdch",
  "Accept-Language": "zh-CN,zh;q=0.8",
  "Referer": "http://www.gpsspg.com",
 }
 _res = requests.get(
  "http://restapi.amap.com/v3/geocode/regeo?key={2}&s=rsv3&location={1},{0}&platform=JS&logversion=2.0&sdkversion=1.3&appname=http%3A%2F%2Fwww.gpsspg.com%2Fiframe%2Fmaps%2Famap_161128.htm%3Fmapi%3D3&csid=945C5A2C-E67F-4362-B881-9608D9BC9913".format(gps[0], gps[1], KEY), headers=_header, timeout=(5, 5))
 _json = _res.json()
 # 判断是否取得数据
 if _json and _json["status"] == "1" and _json["info"] == "OK":
  # 返回对应地址
  return _json.get("regeocode").get("formatted_address")
 except Exception as e:
 pass