YAbuDTFC

1#include <opencv2/core.hpp>
2#include <opencv2/videoio.hpp>
3#include <opencv2/highgui.hpp>
4#include <iostream>
5using namespace cv;
6using namespace std;
7int main(int, char**)
8{
9  Mat frame;
10  //--- INITIALIZE VIDEOCAPTURE
11  VideoCapture cap;
12  // open the default camera using default API
13  // cap.open(0);
14  // OR advance usage: select any API backend
15  int deviceID = 0;             // 0 = open default camera
16  int apiID = cv::CAP_ANY;      // 0 = autodetect default API
17  // open selected camera using selected API
18  cap.open(deviceID, apiID);
19  // check if we succeeded
20  if (!cap.isOpened()) {
21    cerr << "ERROR! Unable to open camera\n";
22    return -1;
23  }
24  //--- GRAB AND WRITE LOOP
25  cout << "Start grabbing" << endl
26       << "Press any key to terminate" << endl;
27  auto smallImage = imread("index.png", -1);
28  for (;;)
29  {
30    // wait for a new frame from camera and store it into 'frame'
31    cap.read(frame);
32    cv::Rect roi( cv::Point( 50, 50 ), smallImage.size() );
33    smallImage.copyTo( frame( roi ) );
34
35    // check if we succeeded
36    if (frame.empty()) {
37      cerr << "ERROR! blank frame grabbed\n";
38      break;
39    }
40    // show live and wait for a key with timeout long enough to show images
41    imshow("Live", frame);
42    if (waitKey(5) >= 0)
43      break;
44  }
45  // the camera will be deinitialized automatically in VideoCapture destructor
46  return 0;
47}