OpenCV的消光处理​​时间 [英] OpenCV Mat processing time

问题描述

我想知道是否为OpenCV的函数的src（源）和DST（目的地），具有不同的变量都会对处理时间的效果。我有以下两个功能 做同样的事情。

I'd like to know whether having different variables for the src (source) and dst (destination) of an OpenCV function will have an effect on the processing time. I have two functions below that does the same thing.

public static Mat getY(Mat m){
    Mat mMattemp = new Mat();
    Imgproc.cvtColor(m,mMattemp,Imgproc.COLOR_YUV420sp2RGB);
    Imgproc.cvtColor(mMattemp,mMattemp, Imgproc.COLOR_RGB2HSV);
    Core.inRange(mMattemp, new Scalar(20, 100, 100), new Scalar(30, 255, 255), mMattemp);
    return mMattemp;
}

VERSUS

VERSUS

public static Mat getY(Mat m){
    Mat mMattemp_rgb = new Mat();
    Mat mMattemp_hsv = new Mat();
    Mat mMattemp_ir = new Mat();
    Imgproc.cvtColor(m,mMattemp_rgb,Imgproc.COLOR_YUV420sp2RGB);
    Imgproc.cvtColor(mMattemp_rgb,mMattemp_hsv, Imgproc.COLOR_RGB2HSV);
    Core.inRange(mMattemp_hsv, new Scalar(20, 100, 100), new Scalar(30, 255, 255), mMattemp_ir);
    return mMattemp_ir;
}

这两个比较好？什么是一个优势比其他？

Which of the two is better? What is the advantage of one over the other?

推荐答案

要肯定知道，只是夹着你的的getY 方法调用OpenCV中的内置方法之间的双的GetTickCount（）和双getTickFrequency（）像这样（需要转换到Java）：

To know for sure, just sandwich your getY method calls between OpenCV's built-in methods double getTickCount() and double getTickFrequency() like this (will need to translate to java):

//first uniquely name the algorithms to compare (here just getY_TypeA and getY_TypeB)
double durationA = cv::getTickCount();

getY_TypeA(image); // the function to be tested

durationA = cv::getTickCount()-durationA;
durationA /= cv::getTickFrequency(); // the elapsed time in ms

//now call the other method

double durationB = cv::getTickCount();

getY_TypeB(image); // the function to be tested

durationB = cv::getTickCount()-durationB;
durationB /= cv::getTickFrequency(); // the elapsed time in ms

printf("Type A runtime: "+durationA+" Type B runtime: "+durationB);

有关最佳结果做到这一点的多个呼叫，并将结果平均。

For best results do this for multiple calls and average the results.

这篇关于OpenCV的消光处理​​时间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！