init - 初始化项目

samples/cpp/videocapture_basic.cpp

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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;
+}