Add Java and Python code for the following features2d tutorials: Harris corner detector, Shi-Tomasi corner detector, Creating your own corner detector, Detecting corners location in subpixels, Feature Detection, Feature Description, Feature Matching with FLANN, Features2D + Homography to find a known object. Use Lowe's ratio test to filter the matches.

samples/cpp/tutorial_code/TrackingMotion/goodFeaturesToTrack_Demo.cpp

@@ -29,29 +29,29 @@ void goodFeaturesToTrack_Demo( int, void* );
  */
 int main( int argc, char** argv )
 {
-  /// Load source image and convert it to gray
-  CommandLineParser parser( argc, argv, "{@input | ../data/pic3.png | input image}" );
-  src = imread( parser.get<String>( "@input" ), IMREAD_COLOR );
-  if( src.empty() )
-  {
-    cout << "Could not open or find the image!\n" << endl;
-    cout << "Usage: " << argv[0] << " <Input image>" << endl;
-    return -1;
-  }
-  cvtColor( src, src_gray, COLOR_BGR2GRAY );
+    /// Load source image and convert it to gray
+    CommandLineParser parser( argc, argv, "{@input | ../data/pic3.png | input image}" );
+    src = imread( parser.get<String>( "@input" ) );
+    if( src.empty() )
+    {
+        cout << "Could not open or find the image!\n" << endl;
+        cout << "Usage: " << argv[0] << " <Input image>" << endl;
+        return -1;
+    }
+    cvtColor( src, src_gray, COLOR_BGR2GRAY );
 
-  /// Create Window
-  namedWindow( source_window, WINDOW_AUTOSIZE );
+    /// Create Window
+    namedWindow( source_window );
 
-  /// Create Trackbar to set the number of corners
-  createTrackbar( "Max  corners:", source_window, &maxCorners, maxTrackbar, goodFeaturesToTrack_Demo );
+    /// Create Trackbar to set the number of corners
+    createTrackbar( "Max corners:", source_window, &maxCorners, maxTrackbar, goodFeaturesToTrack_Demo );
 
-  imshow( source_window, src );
+    imshow( source_window, src );
 
-  goodFeaturesToTrack_Demo( 0, 0 );
+    goodFeaturesToTrack_Demo( 0, 0 );
 
-  waitKey(0);
-  return(0);
+    waitKey();
+    return 0;
 }
 
 /**
@@ -60,40 +60,40 @@ int main( int argc, char** argv )
  */
 void goodFeaturesToTrack_Demo( int, void* )
 {
-  if( maxCorners < 1 ) { maxCorners = 1; }
+    /// Parameters for Shi-Tomasi algorithm
+    maxCorners = MAX(maxCorners, 1);
+    vector<Point2f> corners;
+    double qualityLevel = 0.01;
+    double minDistance = 10;
+    int blockSize = 3, gradientSize = 3;
+    bool useHarrisDetector = false;
+    double k = 0.04;
 
-  /// Parameters for Shi-Tomasi algorithm
-  vector<Point2f> corners;
-  double qualityLevel = 0.01;
-  double minDistance = 10;
-  int blockSize = 3, gradiantSize = 3;
-  bool useHarrisDetector = false;
-  double k = 0.04;
+    /// Copy the source image
+    Mat copy = src.clone();
 
-  /// Copy the source image
-  Mat copy;
-  copy = src.clone();
-
-  /// Apply corner detection
-  goodFeaturesToTrack( src_gray,
-               corners,
-               maxCorners,
-               qualityLevel,
-               minDistance,
-               Mat(),
-               blockSize,
-               gradiantSize,
-               useHarrisDetector,
-               k );
+    /// Apply corner detection
+    goodFeaturesToTrack( src_gray,
+                         corners,
+                         maxCorners,
+                         qualityLevel,
+                         minDistance,
+                         Mat(),
+                         blockSize,
+                         gradientSize,
+                         useHarrisDetector,
+                         k );
 
 
-  /// Draw corners detected
-  cout<<"** Number of corners detected: "<<corners.size()<<endl;
-  int r = 4;
-  for( size_t i = 0; i < corners.size(); i++ )
-     { circle( copy, corners[i], r, Scalar(rng.uniform(0,255), rng.uniform(0,255), rng.uniform(0,255)), -1, 8, 0 ); }
+    /// Draw corners detected
+    cout << "** Number of corners detected: " << corners.size() << endl;
+    int radius = 4;
+    for( size_t i = 0; i < corners.size(); i++ )
+    {
+        circle( copy, corners[i], radius, Scalar(rng.uniform(0,255), rng.uniform(0, 256), rng.uniform(0, 256)), FILLED );
+    }
 
-  /// Show what you got
-  namedWindow( source_window, WINDOW_AUTOSIZE );
-  imshow( source_window, copy );
+    /// Show what you got
+    namedWindow( source_window );
+    imshow( source_window, copy );
 }