diff --git a/modules/viz/include/opencv2/viz/viz3d.hpp b/modules/viz/include/opencv2/viz/viz3d.hpp
index 72e3076df4..33b2743254 100644
--- a/modules/viz/include/opencv2/viz/viz3d.hpp
+++ b/modules/viz/include/opencv2/viz/viz3d.hpp
@@ -7,6 +7,7 @@
 #include <opencv2/core.hpp>
 #include <opencv2/viz/types.hpp>
 #include <opencv2/viz/widgets.hpp>
+#include <boost/concept_check.hpp>
 
 namespace cv
 {
@@ -46,6 +47,9 @@ namespace cv
             
             void convertToWindowCoordinates(const Point3d &pt, Point3d &window_coord);
             void converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction);
+            
+            Size getWindowSize() const;
+            void setWindowSize(const Size &window_size);
 
             void spin();
             void spinOnce(int time = 1, bool force_redraw = false);
diff --git a/modules/viz/src/types.cpp b/modules/viz/src/types.cpp
index 3395b0e66e..7ab918fdde 100644
--- a/modules/viz/src/types.cpp
+++ b/modules/viz/src/types.cpp
@@ -196,7 +196,7 @@ void cv::viz::Camera::setWindowSize(const Size &window_size)
     float aspect_ratio_new = static_cast<float>(window_size.width) / static_cast<float>(window_size.height);
     
     if (principal_point_[0] < 0.0f)
-        fov_[0] = 2.f * atan(tan(fov_[1] * 0.5) * aspect_ratio_new); // This assumes that the lens is symmetric!
+        fov_[0] = 2.f * atan(tan(fov_[1] * 0.5f) * aspect_ratio_new); // This assumes that the lens is symmetric!
     else
         fov_[0] = (atan2(principal_point_[0],focal_[0]) + atan2(window_size.width-principal_point_[0],focal_[0])); // TODO I need to check this
     
diff --git a/modules/viz/src/viz3d.cpp b/modules/viz/src/viz3d.cpp
index 6908bc8a46..ced6e73e18 100644
--- a/modules/viz/src/viz3d.cpp
+++ b/modules/viz/src/viz3d.cpp
@@ -52,4 +52,7 @@ void cv::viz::Viz3d::setViewerPose(const Affine3f &pose) { impl_->setViewerPose(
 cv::Affine3f cv::viz::Viz3d::getViewerPose() { return impl_->getViewerPose(); }
 
 void cv::viz::Viz3d::convertToWindowCoordinates(const Point3d &pt, Point3d &window_coord) { impl_->convertToWindowCoordinates(pt, window_coord); }
-void cv::viz::Viz3d::converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction) { impl_->converTo3DRay(window_coord, origin, direction); }
\ No newline at end of file
+void cv::viz::Viz3d::converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction) { impl_->converTo3DRay(window_coord, origin, direction); }
+
+cv::Size cv::viz::Viz3d::getWindowSize() const { return impl_->getWindowSize(); }
+void cv::viz::Viz3d::setWindowSize(const Size &window_size) { impl_->setWindowSize(window_size.width, window_size.height); }
\ No newline at end of file
diff --git a/modules/viz/src/viz3d_impl.cpp b/modules/viz/src/viz3d_impl.cpp
index 8dbf1fb10e..fc2b3a55d7 100644
--- a/modules/viz/src/viz3d_impl.cpp
+++ b/modules/viz/src/viz3d_impl.cpp
@@ -963,6 +963,7 @@ void cv::viz::Viz3d::VizImpl::setWindowName (const std::string &name)
 
 void cv::viz::Viz3d::VizImpl::setWindowPosition (int x, int y) { window_->SetPosition (x, y); }
 void cv::viz::Viz3d::VizImpl::setWindowSize (int xw, int yw) { window_->SetSize (xw, yw); }
+cv::Size cv::viz::Viz3d::VizImpl::getWindowSize() const { return Size(window_->GetSize()[0], window_->GetSize()[1]); }
 
 bool cv::viz::Viz3d::VizImpl::addPolygonMesh (const Mesh3d& /*mesh*/, const Mat& /*mask*/, const std::string &/*id*/)
 {
diff --git a/modules/viz/src/viz3d_impl.hpp b/modules/viz/src/viz3d_impl.hpp
index d38204a25e..e190b720bb 100644
--- a/modules/viz/src/viz3d_impl.hpp
+++ b/modules/viz/src/viz3d_impl.hpp
@@ -135,10 +135,10 @@ public:
 
 
 
-
     //to implemnt in Viz3d
     void saveScreenshot (const String &file);
     void setWindowPosition (int x, int y);
+    Size getWindowSize() const;
     void setWindowSize (int xw, int yw);
     void setFullScreen (bool mode);
     void setWindowName (const String &name);