Qt 5 and OpenCV 4 Computer Vision Projects

Capturing and playing

We have gotten the information of the webcams in the preceding section, so let's capture and play the video feed from a chosen webcam using OpenCV.

It is very easy to capture a video using OpenCV. The following is an example:

     #include <iostream>     #include "opencv2/opencv.hpp"     using namespace std;     using namespace cv;     int main() {         VideoCapture cap(0);         if(!cap.isOpened()) {             return -1;         }         while(1) {             Mat frame;             cap >> frame;             if (frame.empty())                 break;             imshow( "Frame", frame );             char c = (char)waitKey(25);             if(c==27) // ESC                 break;         }         cap.release();         destroyAllWindows();         return 0;     }

In the preceding code, first, we create an instance of VideoCapture with the index of the default webcam, and then test whether the camera is successfully ...