Merge moved code from opencv/3.4

modules/cudabgsegm/test/test_bgsegm.cpp

@@ -110,7 +110,7 @@ CUDA_TEST_P(MOG2, Update)
 
         mog2_gold->apply(frame, foreground_gold);
 
-        ASSERT_MAT_SIMILAR(foreground_gold, foreground, detectShadow ? 13e-3 : 18e-8);
+        ASSERT_MAT_SIMILAR(foreground_gold, foreground, detectShadow ? 13e-3 : 2e-4);
     }
 }
 

modules/viz/include/opencv2/viz/widgets.hpp

@@ -374,8 +374,8 @@ namespace cv
         public:
             /** @brief Constructs a WCube.
 
-            @param min_point Specifies minimum point of the bounding box.
-            @param max_point Specifies maximum point of the bounding box.
+            @param min_point Specifies minimum (or maximum) point of the bounding box.
+            @param max_point Specifies maximum (or minimum) point of the bounding box, opposite to the first parameter.
             @param wire_frame If true, cube is represented as wireframe.
             @param color Color of the cube.