五、视频流人脸识别（Python）（recognize_video.py）

    # USAGE
    # python recognize_video.py --detector face_detection_model \
    #	--embedding-model openface_nn4.small2.v1.t7 \
    #	--recognizer output/recognizer.pickle \
    #	--le output/le.pickle
    
    # v4_v1解决了多线程中的Exception in thread Thread-7：UnboundLocalError: 
    # local variable 'name' referenced before assignment
    
    # 加载必要的包
    from imutils.video import VideoStream
    from imutils.video import FPS
    import numpy as np
    import imutils
    import pickle
    import time
    import cv2
    import os
    import tkinter