fixed bug #1571

samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp

@@ -65,7 +65,10 @@ int main( int argc, char* argv[])
     t = (double)getTickCount();
 
     for (int i = 0; i < times; ++i)
-        J = ScanImageAndReduceC(I.clone(), table);
+    {
+        cv::Mat clone_i = I.clone();
+        J = ScanImageAndReduceC(clone_i, table);
+    }
 
     t = 1000*((double)getTickCount() - t)/getTickFrequency();
     t /= times;
@@ -76,7 +79,10 @@ int main( int argc, char* argv[])
     t = (double)getTickCount();
 
     for (int i = 0; i < times; ++i)
-        J = ScanImageAndReduceIterator(I.clone(), table);
+    {
+        cv::Mat clone_i = I.clone();
+        J = ScanImageAndReduceIterator(clone_i, table);
+    }
 
     t = 1000*((double)getTickCount() - t)/getTickFrequency();
     t /= times;
@@ -87,7 +93,10 @@ int main( int argc, char* argv[])
     t = (double)getTickCount();
 
     for (int i = 0; i < times; ++i)
-        ScanImageAndReduceRandomAccess(I.clone(), table);
+    {
+        cv::Mat clone_i = I.clone();
+        ScanImageAndReduceRandomAccess(clone_i, table);
+    }
 
     t = 1000*((double)getTickCount() - t)/getTickFrequency();
     t /= times;