1 #include <stdio.h>
 2 #include <iostream>
 3 #include "opencv2/core/core.hpp"
 4 #include "opencv2/features2d/features2d.hpp"
 5 #include "opencv2/highgui/highgui.hpp"
 6 
 7 using namespace cv;
 8 
 9 void readme();
10 
11 /** @function main */
12 int main( int argc, char** argv )
13 {
14   if( argc != 3 )
15   { readme(); return -1; }
16 
17   Mat img_1 = imread( argv[1], CV_LOAD_IMAGE_GRAYSCALE );
18   Mat img_2 = imread( argv[2], CV_LOAD_IMAGE_GRAYSCALE );
19 
20   if( !img_1.data || !img_2.data )
21   { std::cout<< " --(!) Error reading images " << std::endl; return -1; }
22 
23   //-- Step 1: Detect the keypoints using SURF Detector
24   int minHessian = 400;
25 
26   SurfFeatureDetector detector( minHessian );
27 
28   std::vector<KeyPoint> keypoints_1, keypoints_2;
29 
30   detector.detect( img_1, keypoints_1 );
31   detector.detect( img_2, keypoints_2 );
32 
33   //-- Draw keypoints
34   Mat img_keypoints_1; Mat img_keypoints_2;
35 
36   drawKeypoints( img_1, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT );
37   drawKeypoints( img_2, keypoints_2, img_keypoints_2, Scalar::all(-1), DrawMatchesFlags::DEFAULT );
38 
39   //-- Show detected (drawn) keypoints
40   imshow("Keypoints 1", img_keypoints_1 );
41   imshow("Keypoints 2", img_keypoints_2 );
42 
43   waitKey(0);
44 
45   return 0;
46   }
47 
48   /** @function readme */
49   void readme()
50   { std::cout << " Usage: ./SURF_detector <img1> <img2>" << std::endl; }