#include <iostream>

#include "opencv2/core/core.hpp"

#include "opencv2/features2d/features2d.hpp"

#include "opencv2/highgui/highgui.hpp"

using namespace std;

using namespace cv;

using namespace cv::gpu;

class Body : public ParallelLoopBody

{

public:

    virtual void operator() (const Range& range) const

    {

        for (int i = range.start; i < range.end; ++i)

        {

            Mat img = Mat::zeros(1000, 1000, CV_8U);

            img(Rect(500,500,20,20)) = 255;

            vector<KeyPoint> kp;

            Ptr<FeatureDetector> detector = FeatureDetector::create("BRISK");

            detector->set("thres", 6);

            detector->detect(img, kp);

            cout << i << endl;

        }

    }

};

int main()

{

    initModule_features2d();

    Body body;

    parallel_for_(Range(0, 500), body);

    return 0;

}