opencv环境
1、访问Python Extension Packages for Windows，下载python对应版本的opencv。
比如小编下载的是opencv_python-3.3.0+contrib-cp36-cp36m-win_amd64.whl，cp36表示Python是3.6版本，win_amd64是表示安装的python是64bit的，+contrib表示包括contrib包。
2、下载好后，把它放到C盘中，执行安装命令：
pip install C:opencv_python-3.3.0+contrib-cp36-cp36m-win_amd64.whl
运行代码
修改
从本地获取。
# vs = VideoStream(src=0).start()
# vs =cv2.VideoCapture('C:\Users\voidking\Desktop\real-time-object-detection\test_video.flv')
vs =cv2.VideoCapture('./test_video.flv')
# grab the frame from the threaded video stream and resize it
# to have a maximum width of 400 pixels
# frame = vs.read()
# frame = imutils.resize(frame, width=400)
# grab the frame from the threaded video file stream
(grabbed,frame) = vs.read()
# if the frame was not grabbed, then we have reached the end
# of the stream
if not grabbed:
break
frame = imutils.resize(frame, width=800)
运行
推荐使用命令：
python real_time_object_detection.py -p ./MobileNetSSD_deploy.prototxt.txt -m ./MobileNetSSD_deploy.caffemodel
或者，指定绝对路径，假设项目目录为C:UsersvoidkingDesktop
eal-time-object-detection，那么命令如下：
python real_time_object_detection.py -p "C:UsersvoidkingDesktop
eal-time-object-detectionMobileNetSSD_deploy.prototxt.txt" -m "C:UsersvoidkingDesktop
eal-time-object-detectionMobileNetSSD_deploy.caffemodel"
进阶修改
我们看到，prototxt和model都是指定的，那我们的视频文件也用这种方式指定，就更加友好一点。
# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-p", "--prototxt", required=True,
help="path to Caffe 'deploy' prototxt file")
ap.add_argument("-m", "--model", required=True,
help="path to Caffe pre-trained model")
ap.add_argument("-c", "--confidence", type=float, default=0.2,
help="minimum probability to filter weak detections")
args = vars(ap.parse_args())
我们插入一行：
ap.add_argument("-v", "--video", required=True,
help="path to Caffe video file")
然后在初始化视频流时，修改为：
vs =cv2.VideoCapture(args["video"])
运行命令修改为
python real_time_object_detection.py -p ./MobileNetSSD_deploy.prototxt.txt -m ./MobileNetSSD_deploy.caffemodel -v ./test_video.flv
运行效果
