OpenCV：计时函数getTickCount、getTickFrequency

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1. getTickCount() & getTickFrequency()

getTickCount()：返回CPU自某个时间以来走过的时钟周期数。
getTickFrequency()：返回CPU一秒中所走的时钟周期数，因此可以以秒为单位对某运算时间计时。

double start = static_cast<double>(getTickCount());
double time = ((double)getTickCount() - start) / getTickFrequency();
cout << "run time: " << time << "s" << endl;

2. cvGetTickCount() & cvGetTickFrequency()

【注】：此时得到的单位是us级的统计时间。

 double start = static_cast<double>(cvGetTickCount());
 double time = ((double)cvGetTickCount() - start) / cvGetTickFrequency();
 cout << "run time: " << time << "us" << endl;