Surf Detector

	#include <iostream>
	#include <stdio.h>
	#include <stdlib.h>
	#include "opencv2/highgui/highgui.hpp"
	#include "opencv2/imgproc/imgproc.hpp"
	#include "opencv2/core/core.hpp"
	#include "opencv2/features2d/features2d.hpp"
	using namespace std;
	using namespace cv;
	//#include "Functions.h"
	char* source_window = "Source image";
	char* corners_window = "Corners detected";
	int main()
	{
	Mat src;
	src = imread("building.jpg",CV_LOAD_IMAGE_GRAYSCALE);
	if(src.empty())
	{
	cout << "Could not open or find the image" << std::endl ;
	return -1;
	}
	// -- step 1: Detect the keypoints using SURF Detector
	int minHessian = 200;
	SurfFeatureDetector detector(minHessian);
	vector<KeyPoint> keypoints;
	detector.detect(src,keypoints);
	Mat img_keypoints;
	drawKeypoints(src,keypoints,img_keypoints,Scalar::all(-1), DrawMatchesFlags::DEFAULT);
	imshow("Keypoins", img_keypoints);
	waitKey(0);
	return 0;
	}

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