C++通过OpenCV打开摄像头Demo
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#include "opencv2/core.hpp" #include "opencv2/imgproc.hpp" #include "opencv2/highgui.hpp" #include "opencv2/videoio.hpp" #include <iostream> #include <time.h> using namespace cv; using namespace std; void drawText(Mat & image);//声明标志 int main() { cout << "开始调用OpenCV " << CV_VERSION << endl; Mat image; VideoCapture capture; capture.open(0);//打开默认的摄像头 //0号为默认摄像头 if(capture.isOpened())//capture.isOpened()打开摄像头 { cout << "打开摄像头" << endl; for(;;) { capture >> image; if(image.empty()) break; drawText(image);//调用标志 imshow("简单的摄像头调用", image);//图像显示页面的标题 if(waitKey(10) >= 0) break; } } else { cout << "无捕获" << endl; image = Mat::zeros(480, 640, CV_8UC1); drawText(image); imshow("简单的摄像头调用", image);//图像显示页面的标题 waitKey(0); } return 0; } void drawText(Mat & image) { putText(image,"01123",//视频标志 Point(20, 50),//标志在视频上的相对位置 FONT_HERSHEY_COMPLEX, 1, // 字体和规模 Scalar(5, 77, 25), // 字体颜色 1, LINE_AA); // 线厚度和类型 } |