opencv打印帧率

打印帧率	#include #include #include #include #include #include #include using namespace std; using namespace std::chrono; int main(int argc, char** argv) {     double inferenceTime(0.0), t1(0.0);     while (true)     {         t1 = static_cast(cv::getTickCount());         std::this_thread::sleep_for(std::chrono::milliseconds(40));         inferenceTime = (static_cast(cv::getTickCount()) - t1) / cv::getTickFrequency()* 1000;         std::cout<< "FPS:" << int(1000.0f / inferenceTime * 100) / 100.0f <     }     return 0; }
图像上绘制帧率	//开始时间 double inferenceTime = 0.0; //结束时间 double t2 = static_cast(cv::getTickCount()); if (inferenceTime == 0)     inferenceTime = (t2 - t1) / cv::getTickFrequency() * 1000; else     inferenceTime = inferenceTime * 0.95 + 0.05 * (t2 - t1) / cv::getTickFrequency() * 1000; //在show_color_image图像上显示show fps cv::Mat fpsPane(35, 155, CV_8UC3); fpsPane.setTo(cv::Scalar(153, 119, 76)); cv::Mat srcRegion = show_color_image(cv::Rect(8, 8, fpsPane.cols, fpsPane.rows)); cv::addWeighted(srcRegion, 0.4, fpsPane, 0.6, 0, srcRegion); std::stringstream fpsSs; fpsSs << "FPS: " << int(1000.0f / inferenceTime * 100) / 100.0f; cv::putText(show_color_image, fpsSs.str(), cv::Point(16, 32),     cv::FONT_HERSHEY_COMPLEX, 0.8, cv::Scalar(0, 0, 255));
抽帧方法	int main(int argc, char** argv) {     int i(0);     int tick(0);     while (true)     {         i++;         //抽帧方法         if (++tick > 0)         {             tick = 0;             //模拟检测             std::this_thread::sleep_for(std::chrono::milliseconds(30));             std::cout << "num=" << i << " ++++++++++++++++++++++++" << std::endl;         }         std::cout << "num=" << i << "  >>>>>>> fps=" << fps() << std::endl;         //std::this_thread::sleep_for(std::chrono::milliseconds(1));     }     return 0; }