Fixed bugs in FernDescriptorMatch and FernClassifier

modules/features2d/src/descriptors.cpp

@@ -541,7 +541,7 @@ void FernDescriptorMatch::trainFernClassifier()
         vector<int> labels;
         for( size_t imageIdx = 0; imageIdx < collection.images.size(); imageIdx++ )
         {
-            refimgs[imageIdx] = &collection.images[imageIdx];
+            refimgs[imageIdx] = new Mat (collection.images[imageIdx]);
             for( size_t pointIdx = 0; pointIdx < collection.points[imageIdx].size(); pointIdx++ )
             {
                 points.push_back(collection.points[imageIdx][pointIdx].pt);

modules/features2d/src/planardetect.cpp

@@ -853,7 +853,7 @@ void FernClassifier::train(const vector<Point2f>& points,
     for( i = 0; i < nsamples; i++ )
     {
         Point2f pt = points[i];
-        const Mat& src = *refimgs[i];
+        const Mat& src = labels.empty() ? *refimgs[i] : *refimgs[labels[i]];
         int classId = labels.empty() ? i : labels[i];
         if( verbose && (i+1)*progressBarSize/nsamples != i*progressBarSize/nsamples )
             putchar('.');