openv計時類TickMeter

  class CV_EXPORTS TickMeter
    {
    public:
        TickMeter();
        void start();
        void stop();

        int64 getTimeTicks() const;
        double getTimeMicro() const;
        double getTimeMilli() const;
        double getTimeSec()   const;
        int64 getCounter() const;

        void reset();
    private:
        int64 counter;
        int64 sumTime;
        int64 startTime;
    };

     實現部分

cv::TickMeter::TickMeter()
{
	reset(); 
}

int64 cv::TickMeter::getTimeTicks() const
{
	return sumTime;
}

double cv::TickMeter::getTimeMicro() const 
{
	return (double)getTimeTicks()/cvGetTickFrequency();
}

double cv::TickMeter::getTimeMilli() const 
{
	return getTimeMicro()*1e-3;
}

double cv::TickMeter::getTimeSec()   const 
{
	return getTimeMilli()*1e-3;
}

int64 cv::TickMeter::getCounter() const 
{
	return counter;
}

void  cv::TickMeter::reset()
{
	startTime = 0; sumTime = 0; counter = 0;
}

void cv::TickMeter::start()
{
	startTime = cvGetTickCount();
}

void cv::TickMeter::stop()
{
	int64 time = cvGetTickCount();
	if ( startTime == 0 )
		return;

	++counter;

	sumTime += ( time - startTime );
	startTime = 0;
}