1 #include "opencv2/core.hpp" 2 #include "opencv2/imgproc.hpp" 3 #include "opencv2/highgui.hpp" 4 #include "opencv2/videoio.hpp" 5 #include <iostream> 6 7 using namespace cv; 8 using namespace std; 9 10 void drawText(Mat & image); 11 12 int main() 13 { 14 cout << "Built with OpenCV " << CV_VERSION << endl; 15 Mat image; 16 VideoCapture capture; 17 capture.open(0); 18 if(capture.isOpened()) 19 { 20 cout << "Capture is opened" << endl; 21 for(;;) 22 { 23 capture >> image; 24 if(image.empty()) 25 break; 26 drawText(image); 27 imshow("Sample", image); 28 if(waitKey(10) >= 0) 29 break; 30 } 31 } 32 else 33 { 34 cout << "No capture" << endl; 35 image = Mat::zeros(480, 640, CV_8UC1); 36 drawText(image); 37 imshow("Sample", image); 38 waitKey(0); 39 } 40 return 0; 41 } 42 43 void drawText(Mat & image) 44 { 45 putText(image, "Hello OpenCV", 46 Point(20, 50), 47 FONT_HERSHEY_COMPLEX, 1, // font face and scale 48 Scalar(255, 255, 255), // white 49 1, LINE_AA); // line thickness and type 50 } 51
