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打印帧率

#include <iostream>

#include <opencv2/opencv.hpp>

#include <opencv2/core.hpp>

#include <opencv2/core/opengl.hpp>

#include <opencv2/highgui.hpp>

#include <thread>

#include <chrono>

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<double>(cv::getTickCount());

        std::this_thread::sleep_for(std::chrono::milliseconds(40));

        inferenceTime = (static_cast<double>(cv::getTickCount()) - t1) / cv::getTickFrequency()* 1000;

        std::cout<< "FPS:" << int(1000.0f / inferenceTime * 100) / 100.0f <<std::endl;

    }

    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<double>(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;

}