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samples/cpp/videocapture_basic.cpp
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Update videocapture_basic.cpp
24 апр 2020, 11:42
24 апр 2020, 11:42
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/** @file videocapture_basic.cpp @brief A very basic sample for using VideoCapture and VideoWriter @author PkLab.net @date Aug 24, 2016 */ #include <opencv2/core.hpp> #include <opencv2/videoio.hpp> #include <opencv2/highgui.hpp> #include <iostream> #include <stdio.h> using namespace cv; using namespace std; int main(int, char**) { Mat frame; //--- INITIALIZE VIDEOCAPTURE VideoCapture cap; // open the default camera using default API // cap.open(0); // OR advance usage: select any API backend int deviceID = 0; // 0 = open default camera int apiID = cv::CAP_ANY; // 0 = autodetect default API // open selected camera using selected API cap.open(deviceID, apiID); // check if we succeeded if (!cap.isOpened()) { cerr << "ERROR! Unable to open camera\n"; return -1; } //--- GRAB AND WRITE LOOP cout << "Start grabbing" << endl << "Press any key to terminate" << endl; for (;;) { // wait for a new frame from camera and store it into 'frame' cap.read(frame); // check if we succeeded if (frame.empty()) { cerr << "ERROR! blank frame grabbed\n"; break; } // show live and wait for a key with timeout long enough to show images imshow("Live", frame); if (waitKey(5) >= 0) break; } // the camera will be deinitialized automatically in VideoCapture destructor return 0; }