How can I acquire frames from a live video stream, acquire the frames, then use the frames to recreate the live video stream?

Question

Shinobu 2016-12-7

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回答： Jiro Doke 2016-12-9

Hello. I want to detect red objects from the live video stream (I know how to detect red objects)

What I want to know is how to acquire the frames from the original live video stream and recreate another live video stream using the processed frames and play these two video streams side by side.

Please help. I'd be really grateful to you.

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Answer 1

Image Analyst 2016-12-8

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Use getsnapshot()

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Image Analyst 2016-12-8

I have not personally done that so I can't direct you. Call tech support and they will help you.

Shinobu 2016-12-9

Okay. Thank you for your time and help. I'll try to do that.

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Answer 2

Jiro Doke 2016-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/315850-how-can-i-acquire-frames-from-a-live-video-stream-acquire-the-frames-then-use-the-frames-to-recrea#answer_246549

在 MATLAB Online 中打开

One such example.

v = VideoReader('xylophone.mp4');
% Display first frame
firstFrame = readFrame(v);
subplot(1,2,1)
h1 = imshow(firstFrame);
subplot(1,2,2)
h2 = imshow(rgb2gray(firstFrame));
% Loop through all frames
while hasFrame(v)
    frame = readFrame(v);
    frameG = rgb2gray(frame);
    % Update image
    h1.CData = frame;
    h2.CData = frameG;
    drawnow
end