opencv计算运行时间

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

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

printf( "run time = %gs\n", Time /(cvGetTickFrequency()*1000000) );//秒