opencv 计时 帧率

C++版的getTickFrequency返回的是每秒钟的tick数

C版的cvGetTickFrequency返回的是每微妙的tick数

double t = (double)cvGetTickCount();
//  算法过程
t = (double)cvGetTickCount() - t;

printf( "run time = %gms\n", t/(cvGetTickFrequency()*1000) );

这//opencv 中如何进行程序的计时呢？

 int64 tStart = 0;
 int64 tDuration = 0;

   tStart = getTickCount();

 tDuration = getTickCount() - tStart;
 double fps = static_cast<double>(getTickFrequency() / tDuration);

  printf("fps:%f\n",fps);

计时函数1. 纯C 高精度（100ns）测量慢
    [cpp]  view plain  copy
   #include <Windows.h>  
   #include <stdio.h>  
   int timer1_test()  
   {  
       LARGE_INTEGER start;  
       LARGE_INTEGER end ;  
       LARGE_INTEGER frequency;  
       int i = 0;  
     
       if (!QueryPerformanceFrequency(&frequency))  
       {  
           return -1;  
       }  
     
       QueryPerformanceCounter(&start); //开始计时  
     
   //     for (int i = 0; i < 100000; ++i)  
   //     {  
   //         ;// 用循环来测试计时  
   //     }  
       Sleep(1);  
       QueryPerformanceCounter(&end); //结束计时  
     
       printf("main cost:%f\n", (double)(end.QuadPart - start.QuadPart) / (double)frequency.QuadPart); //打印for循环执行时间  
     
       getchar();  
       return 0;  
   }
 2.纯C 低精度(1ms)测量快
    w plai copy
   #include <stdio.h>  
   #include <time.h>  
     
   void timer2_test()  
   {  
       clock_t start,end;  
       start=clock();  
       Sleep(1000);  
       end=clock();  

       double duration = (double)(end - start);
 cout << "--> time: " << duration << " s" << endl;
 printf("time  : %f  ms \n",duration/1000);
   }
 3.C++  OpenCV测试 高精度 view p copy
  #include"opencv.hpp"  
    
  void timer3_test()  
  {  
      int64 start=0,end=0;  
      start = getTickCount();  
      Sleep(1000);  
      end = getTickCount();  
      cout << "The differences: " << 1000.0*(end - start)/getTickFrequency()<<" ms"<< endl;  
  }  

 这个是在多线程下比较精确的#include <time.h>
struct timespec time1={0,0};
struct timespec time2={0,0};
int main()
{
 clock_gettime(CLOCK_REALTIME,&time1);
 sRect result = tracker.update( frame);
 clock_gettime(CLOCK_REALTIME,&time2);
 ///
 sum_time += (time2.tv_sec-time1.tv_sec)*1000+(time2.tv_nsec-time1.tv_nsec)/1000000 ;
 printf("time  : %d  ms \n", (time2.tv_sec-time1.tv_sec)*1000+(time2.tv_nsec-time1.tv_nsec)/1000000);
 return 0;
}

文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/jacke121/article/details/60138923