minor modification of gpu video tests

disabled NVidia Visualization test, it's functionality (draw rectangles) doesn't used in gpu module

modules/gpu/src/gftt.cpp

@@ -67,7 +67,9 @@ void cv::gpu::GoodFeaturesToTrackDetector_GPU::operator ()(const GpuMat& image,
 
     CV_Assert(qualityLevel > 0 && minDistance >= 0 && maxCorners >= 0);
     CV_Assert(mask.empty() || (mask.type() == CV_8UC1 && mask.size() == image.size()));
-    CV_Assert(TargetArchs::builtWith(GLOBAL_ATOMICS) && DeviceInfo().supports(GLOBAL_ATOMICS));
+
+    if (!TargetArchs::builtWith(GLOBAL_ATOMICS) || !DeviceInfo().supports(GLOBAL_ATOMICS))
+        CV_Error(CV_StsNotImplemented, "The device doesn't support global atomics");
 
     ensureSizeIsEnough(image.size(), CV_32F, eig_);
 

modules/gpu/test/test_nvidia.cpp

@@ -156,14 +156,15 @@ TEST_P(NCV, HypothesesFiltration)
     ASSERT_TRUE(res);
 }
 
-TEST_P(NCV, Visualization) 
+TEST_P(NCV, DISABLED_Visualization)
 {
+    // this functionality doesn't used in gpu module
     bool res = nvidia_NCV_Visualization(path, nvidiaTestOutputLevel);
 
     ASSERT_TRUE(res);
 }
 
-INSTANTIATE_TEST_CASE_P(NVidia, NPPST, ALL_DEVICES);
-INSTANTIATE_TEST_CASE_P(NVidia, NCV, ALL_DEVICES);
+INSTANTIATE_TEST_CASE_P(GPU_NVidia, NPPST, ALL_DEVICES);
+INSTANTIATE_TEST_CASE_P(GPU_NVidia, NCV, ALL_DEVICES);
 
 #endif // HAVE_CUDA

modules/gpu/test/utility.cpp

@@ -122,7 +122,7 @@ Mat readImageType(const string& fname, int type)
         cvtColor(src, temp, cv::COLOR_BGR2BGRA);
         swap(src, temp);
     }
-    src.convertTo(src, CV_MAT_DEPTH(type));
+    src.convertTo(src, CV_MAT_DEPTH(type), CV_MAT_DEPTH(type) == CV_32F ? 1.0 / 255.0 : 1.0);
     return src;
 }