fixed xfeatures2d tests

modules/xfeatures2d/src/stardetector.cpp

@@ -483,6 +483,11 @@ StarDetectorImpl::StarDetectorImpl(int _maxSize, int _responseThreshold,
 void StarDetectorImpl::detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask )
 {
     Mat image = _image.getMat(), mask = _mask.getMat(), grayImage = image;
+    if( image.empty() )
+    {
+        keypoints.clear();
+        return;
+    }
     if( image.channels() > 1 ) cvtColor( image, grayImage, COLOR_BGR2GRAY );
 
     Mat responses, sizes;

modules/xfeatures2d/test/test_detectors.cpp

@@ -290,7 +290,7 @@ void CV_DetectorsTest::run( int /*start_from*/ )
     if (exp.empty())
         return;
 
-    if (!testDetector(to_test, SURF::create(1536+512+512, 2), exp))
+    if (!testDetector(to_test, SURF::create(1536+512+512, 2, 2, true, false), exp))
         return;
 
     LoadExpected(string(ts->get_data_path()) + "detectors/star.xml", exp);

modules/xfeatures2d/test/test_features2d.cpp

@@ -1223,12 +1223,12 @@ protected:
 
 TEST(Features2d_SIFT_using_mask, regression)
 {
-    FeatureDetectorUsingMaskTest test(Algorithm::create<FeatureDetector>("Feature2D.SIFT"));
+    FeatureDetectorUsingMaskTest test(SIFT::create());
     test.safe_run();
 }
 
 TEST(DISABLED_Features2d_SURF_using_mask, regression)
 {
-    FeatureDetectorUsingMaskTest test(Algorithm::create<FeatureDetector>("Feature2D.SURF"));
+    FeatureDetectorUsingMaskTest test(SURF::create());
     test.safe_run();
 }