fixed PyramidAdaptedFeatureDetector (when mask is not empty) (#1206)

modules/features2d/src/detectors.cpp

@@ -602,11 +602,22 @@ bool PyramidAdaptedFeatureDetector::empty() const
 void PyramidAdaptedFeatureDetector::detectImpl( const Mat& image, vector<KeyPoint>& keypoints, const Mat& mask ) const
 {
     Mat src = image;
+    Mat src_mask = mask;
+
+    Mat dilated_mask;
+    if( !mask.empty() )
+    {
+        dilate( mask, dilated_mask, Mat() );
+        Mat mask255( mask.size(), CV_8UC1, Scalar(0) );
+        mask255.setTo( Scalar(255), dilated_mask != 0 );
+        dilated_mask = mask255;
+    }
+
     for( int l = 0, multiplier = 1; l <= maxLevel; ++l, multiplier *= 2 )
     {
         // Detect on current level of the pyramid
         vector<KeyPoint> new_pts;
-        detector->detect( src, new_pts, mask );
+        detector->detect( src, new_pts, src_mask );
         for( vector<KeyPoint>::iterator it = new_pts.begin(), end = new_pts.end(); it != end; ++it)
         {
             it->pt.x *= multiplier;
@@ -620,10 +631,16 @@ void PyramidAdaptedFeatureDetector::detectImpl( const Mat& image, vector<KeyPoin
         if( l < maxLevel )
         {
             Mat dst;
-            pyrDown(src, dst);
+            pyrDown( src, dst );
             src = dst;
+
+            if( !mask.empty() )
+                resize( dilated_mask, src_mask, src.size(), 0, 0, CV_INTER_AREA );
         }
     }
+
+    if( !mask.empty() )
+        KeyPointsFilter::runByPixelsMask( keypoints, mask );
 }
 
 }