OpenCV显示摄像头FPS

/************************************************************************ * Copyright(c) 2011 Yang Xian * All rights reserved. * * File: main.cpp * Brief: 读取摄像头，并且显示当前fps * Version: 1.0 * Author: Yang Xian * Email: xyang2011@sinano.ac.cn * Date: 2011/12/22 * History: ************************************************************************/ #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <stdlib.h> #include <iostream> using namespace cv; using namespace std; void main() { Mat frame; VideoCapture capture(0); double fps; char str[5]; namedWindow("webCam"); double t = 0; while (1) { t = (double)getTickCount(); if (waitKey(50) == 27) { break; } if (capture.isOpened()) { capture >> frame; // do something ... t = ((double)getTickCount() - t) / getTickFrequency(); fps = 1.0 / t; sprintf(str, "%5f", fps); string fpsStr("FPS:"); fpsStr += str; putText(frame, fpsStr, Point(0,30), FONT_HERSHEY_SIMPLEX, 1.0, Scalar(0,0,255)); imshow("webCam", frame); } else { cout << "capture device failed to open!" << endl; break; } } }