#include <opencv2/nonfree/features2d.hpp>

#include <opencv2/features2d/features2d.hpp>

#include <opencv2/highgui/highgui.hpp>

#include <iostream>

using namespace cv;

using namespace std;

int main(int argc, char **argv){

    if(argc < 2){

        cout << "Usage: " << argv[0] << " image" << endl;

        exit(0);

    }

    Mat image = imread(argv[1]);

    SiftFeatureDetector detector(100);

    std::vector<KeyPoint> keypoints;

    detector.detect(image, keypoints);

    cout << "k size= " << keypoints.size() << endl;

    for(size_t i = 0; i < keypoints.size(); i++){

        cout << "k response " << keypoints.at(i).response << endl;

    }

    exit(0);

}