opencv：计算程序运行时间

//注意添加头文件
#include  <cv.h>
using namespace std;

double t = (double)cvGetTickCount();

//。。。。。。算法或程序代码

t = (double)cvGetTickCount() - t;
printf( "processing time = %gms\n", t/(cvGetTickFrequency()*1000) );//输出时间为ms
printf( "processing time = %gs\n", t/(cvGetTickFrequency()*1000000) );//输出时间为s