Added two sample code for features 2D - SURF descriptor and detector

samples/cpp/tutorial_code/features2D/SURF_descriptor.cpp

@@ -0,0 +1,71 @@
+/**
+ * @file SURF_descriptor
+ * @brief SURF detector + descritpor + BruteForce Matcher + drawing matches with OpenCV functions
+ * @author A. Huaman
+ */
+
+#include <stdio.h>
+#include <iostream>
+#include "opencv2/core/core.hpp"
+#include "opencv2/features2d/features2d.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+using namespace cv;
+
+void readme();
+
+/**
+ * @function main
+ * @brief Main function
+ */
+int main( int argc, char** argv )
+{
+  if( argc != 3 )
+  { return -1; }
+
+  Mat img_1 = imread( argv[1], CV_LOAD_IMAGE_GRAYSCALE );
+  Mat img_2 = imread( argv[2], CV_LOAD_IMAGE_GRAYSCALE );
+  
+  if( !img_1.data || !img_2.data )
+  { return -1; }
+
+  //-- Step 1: Detect the keypoints using SURF Detector
+  int minHessian = 400;
+
+  SurfFeatureDetector detector( minHessian );
+
+  std::vector<KeyPoint> keypoints_1, keypoints_2;
+
+  detector.detect( img_1, keypoints_1 );
+  detector.detect( img_2, keypoints_2 );
+
+  //-- Step 2: Calculate descriptors (feature vectors)
+  SurfDescriptorExtractor extractor;
+
+  Mat descriptors_1, descriptors_2;
+
+  extractor.compute( img_1, keypoints_1, descriptors_1 );
+  extractor.compute( img_2, keypoints_2, descriptors_2 );
+
+  //-- Step 3: Matching descriptor vectors with a brute force matcher
+  BruteForceMatcher< L2<float> > matcher;
+  std::vector< DMatch > matches;
+  matcher.match( descriptors_1, descriptors_2, matches );
+
+  //-- Draw matches
+  Mat img_matches;
+  drawMatches( img_1, keypoints_1, img_2, keypoints_2, matches, img_matches ); 
+
+  //-- Show detected matches
+  imshow("Matches", img_matches );
+
+  waitKey(0);
+
+  return 0;
+}
+
+/**
+ * @function readme
+ */
+void readme()
+{ std::cout << " Usage: ./SURF_descriptor <img1> <img2>" << std::endl; }

samples/cpp/tutorial_code/features2D/SURF_detector.cpp

@@ -0,0 +1,61 @@
+/**
+ * @file SURF_detector
+ * @brief SURF keypoint detection + keypoint drawing with OpenCV functions
+ * @author A. Huaman
+ */
+
+#include <stdio.h>
+#include <iostream>
+#include "opencv2/core/core.hpp"
+#include "opencv2/features2d/features2d.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+using namespace cv;
+
+void readme();
+
+/**
+ * @function main
+ * @brief Main function
+ */
+int main( int argc, char** argv )
+{
+  if( argc != 3 )
+  { readme(); return -1; }
+
+  Mat img_1 = imread( argv[1], CV_LOAD_IMAGE_GRAYSCALE );
+  Mat img_2 = imread( argv[2], CV_LOAD_IMAGE_GRAYSCALE );
+  
+  if( !img_1.data || !img_2.data )
+  { std::cout<< " --(!) Error reading images " << std::endl; return -1; }
+
+  //-- Step 1: Detect the keypoints using SURF Detector
+  int minHessian = 400;
+
+  SurfFeatureDetector detector( minHessian );
+
+  std::vector<KeyPoint> keypoints_1, keypoints_2;
+
+  detector.detect( img_1, keypoints_1 );
+  detector.detect( img_2, keypoints_2 );
+
+  //-- Draw keypoints
+  Mat img_keypoints_1; Mat img_keypoints_2;
+
+  drawKeypoints( img_1, keypoints_1, img_keypoints_1, Scalar::all(-1), DrawMatchesFlags::DEFAULT ); 
+  drawKeypoints( img_2, keypoints_2, img_keypoints_2, Scalar::all(-1), DrawMatchesFlags::DEFAULT ); 
+
+  //-- Show detected (drawn) keypoints
+  imshow("Keypoints 1", img_keypoints_1 );
+  imshow("Keypoints 2", img_keypoints_2 );
+
+  waitKey(0);
+
+  return 0;
+}
+
+/**
+ * @function readme
+ */
+void readme()
+{ std::cout << " Usage: ./SURF_detector <img1> <img2>" << std::endl; }