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opencvwebcamvideo-captureuvc
Halley Wang
Halley Wang

Reputation: 35

video capture card (webcam like) with OpenCV

I want to use video capture card to capture my screen display, and process the image by OpenCV/C++.

I have heard that there's some video capture card which is webcam like.(i.e. I can get the screen display by VideoCapture in OpenCV.)

Can someone tell me which video capture card should I buy?

Thanks !!!

Upvotes: 0

Views: 4425

Answers (2)

Naveen Kumar
Naveen Kumar

Reputation: 184

I don't know if this helps now. But i found a way using opencv. In linux and python, we achieve this using the following piece of code.

import cv2
cap = cv2.VideoCapture('/dev/video0')

Upvotes: 0

Humam Helfawi
Humam Helfawi

Reputation: 20264

I do not know if there some way to achieve that directly using OpenCV. However, a simple workaround could be like this:

  1. Using this software you can create new webcam that stream your screen: https://sparkosoft.com/how-to-stream-desktop-as-webcam-video

  2. Using OpenCV you can start capture the stream using this code:

    cv::VideoCapture cap;
if(!cap.open(0)) // Use the new webcam Id instead of 0
    return 0;
while(true){
      cv::Mat frame;
      cap >> frame;
      if(frame.empty()) break;
      cv::imshow("Screen", frame);
      if( waitKey(10) == 27 ) break;
}
return 0;

Upvotes: 1

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