gbZQayvz

1// From OpenCV Documents Online (2020)
2
3#include <opencv2/core.hpp>
4#include <opencv2/videoio.hpp>
5#include <opencv2/highgui.hpp>
6#include <iostream>
7#include <stdio.h>
8
9using namespace cv;
10using namespace std;
11
12int main(int, char**)
13{
14    Mat frame;
15    //--- INITIALIZE VIDEOCAPTURE
16    VideoCapture cap;
17    // open the default camera using default API
18    // cap.open(0);
19    // OR advance usage: select any API backend
20    int deviceID = 0;             // 0 = open default camera
21    int apiID = cv::CAP_ANY;      // 0 = autodetect default API
22    // open selected camera using selected API
23    cap.open(deviceID + apiID);
24    // check if we succeeded
25    if (!cap.isOpened()) {
26        cerr << "ERROR! Unable to open camera\n";
27        return -1;
28    }
29    //--- GRAB AND WRITE LOOP
30    cout << "Start grabbing" << endl
31        << "Press any key to terminate" << endl;
32    for (;;)
33    {
34        // wait for a new frame from camera and store it into 'frame'
35        cap.read(frame);
36        // check if we succeeded
37        if (frame.empty()) {
38            cerr << "ERROR! blank frame grabbed\n";
39            break;
40        }
41        // show live and wait for a key with timeout long enough to show images
42        imshow("Live", frame);
43        if (waitKey(5) >= 0)
44            break;
45    }
46    // the camera will be deinitialized automatically in VideoCapture destructor
47    return 0;
48}