如何在 python 中使用 opencv 在实时视频中保存帧？

Question

How to grab a fram from a live video using opencv?

I created a face recognition program using opencv and i want to capture an image when the confidence > 0.8 this is the code for initializing the liveVideo

 LiveVideo = VideoStream(src=0).start()
    while True:
        frame = LiveVideo.read()
    frame = imutils.resize(frame, width=1000)
     ....

if anyone knows how to grab a frame from the live video and save it please tell me how to do so

Answer 1

You can use imwrite function from your opencv to extract the current frame.

You can also add time and convert it to string for naming purpose for the output file.

import time as t
LiveVideo = VideoStream(src=0).start()
        while True:
            frame = LiveVideo.read()
            timestr = t.strftime("%Y%m%d-%H%M%S")
            cv2.imwrite("frame%s.jpg" % timestr, frame )