问题
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 !!!
回答1:
I do not know if there some way to achieve that directly using OpenCV. However, a simple workaround could be like this:
- Using this software you can create new webcam that stream your screen: https://sparkosoft.com/how-to-stream-desktop-as-webcam-video
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;
回答2:
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')
来源:https://stackoverflow.com/questions/43133203/video-capture-card-webcam-like-with-opencv