medianBlur performance test

median_blur_perf_test.cpp

#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/imgcodecs.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    string imageFileName = "test.png";
    {
        Mat src = imread(imageFileName), out;
        TickMeter tick; tick.start();
        medianBlur(src, out, 5); //70ms
        tick.stop();
        cout << src.cols << " x " << src.rows << " (" <<  src.depth() << ", " << src.channels() << ")"
             << ": " << tick.getTimeMilli() << " ms" << endl;
    }
    {
        Mat src = imread(imageFileName, IMREAD_GRAYSCALE), out;
        TickMeter tick; tick.start();
        medianBlur(src, out, 5); //3700ms
        tick.stop();
        cout << src.cols << " x " << src.rows << " (" <<  src.depth() << ", " << src.channels() << ")"
             << ": " << tick.getTimeMilli() << " ms" << endl;
    }
    {
        Mat src = imread(imageFileName, IMREAD_GRAYSCALE), out;
        TickMeter tick; tick.start();
        cvtColor(src, src, CV_GRAY2BGR);
        medianBlur(src, out, 5); //70ms
        cvtColor(out, out, CV_BGR2GRAY); //total process ~100ms
        tick.stop();
        cout << src.cols << " x " << src.rows << " (" <<  src.depth() << ", " << src.channels() << ")"
             << ": " << tick.getTimeMilli() << " ms" << endl;
    }
    cout << cv::getBuildInformation() << endl;
    return 0;
}