diff --git a/modules/viz/src/clouds.cpp b/modules/viz/src/clouds.cpp
index b7c8bbb212..c2c78d5523 100644
--- a/modules/viz/src/clouds.cpp
+++ b/modules/viz/src/clouds.cpp
@@ -347,7 +347,7 @@ cv::viz::WMesh::WMesh(const Mesh &mesh)
     source->SetColorCloudNormalsTCoords(mesh.cloud, mesh.colors, mesh.normals, mesh.tcoords);
     source->Update();
 
-    Mat lookup_buffer(1, mesh.cloud.total(), CV_32SC1);
+    Mat lookup_buffer(1, (int)mesh.cloud.total(), CV_32SC1);
     int *lookup = lookup_buffer.ptr<int>();
     for(int y = 0, index = 0; y < mesh.cloud.rows; ++y)
     {
diff --git a/modules/viz/src/precomp.hpp b/modules/viz/src/precomp.hpp
index 2b34f56389..8329f52f12 100644
--- a/modules/viz/src/precomp.hpp
+++ b/modules/viz/src/precomp.hpp
@@ -267,8 +267,8 @@ namespace cv
                 vtkSmartPointer<vtkUnsignedCharArray> scalars = vtkSmartPointer<vtkUnsignedCharArray>::New();
                 scalars->SetName("Colors");
                 scalars->SetNumberOfComponents(3);
-                scalars->SetNumberOfTuples(size);
-                scalars->SetArray(color_data->val, size * 3, 0);
+                scalars->SetNumberOfTuples((vtkIdType)size);
+                scalars->SetArray(color_data->val, (vtkIdType)(size * 3), 0);
                 return scalars;
             }
 
diff --git a/modules/viz/src/shapes.cpp b/modules/viz/src/shapes.cpp
index f3d24f757c..171470d812 100644
--- a/modules/viz/src/shapes.cpp
+++ b/modules/viz/src/shapes.cpp
@@ -390,21 +390,21 @@ cv::viz::WPolyLine::WPolyLine(InputArray _points, const Color &color)
 
     vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
     points->SetDataType(_points.depth() == CV_32F ? VTK_FLOAT : VTK_DOUBLE);
-    points->SetNumberOfPoints(total);
+    points->SetNumberOfPoints((vtkIdType)total);
 
     if (_points.depth() == CV_32F)
         for(size_t i = 0; i < total; ++i, fpoints += s_chs)
-            points->SetPoint(i, fpoints);
+            points->SetPoint((vtkIdType)i, fpoints);
 
     if (_points.depth() == CV_64F)
         for(size_t i = 0; i < total; ++i, dpoints += s_chs)
-            points->SetPoint(i, dpoints);
+            points->SetPoint((vtkIdType)i, dpoints);
 
     vtkSmartPointer<vtkCellArray> cell_array = vtkSmartPointer<vtkCellArray>::New();
-    cell_array->Allocate(cell_array->EstimateSize(1, total));
-    cell_array->InsertNextCell(total);
+    cell_array->Allocate(cell_array->EstimateSize(1, (int)total));
+    cell_array->InsertNextCell((int)total);
     for(size_t i = 0; i < total; ++i)
-        cell_array->InsertCellPoint(i);
+        cell_array->InsertCellPoint((vtkIdType)i);
 
     vtkSmartPointer<vtkUnsignedCharArray> scalars =  VtkUtils::FillScalars(total, color);
 
diff --git a/modules/viz/src/vizcore.cpp b/modules/viz/src/vizcore.cpp
index b8cad1ca68..b4332a860a 100644
--- a/modules/viz/src/vizcore.cpp
+++ b/modules/viz/src/vizcore.cpp
@@ -278,11 +278,11 @@ void cv::viz::writeTrajectory(InputArray _traj, const String& files_format, int
 
         if (traj.depth() == CV_32F)
             for(size_t i = 0, index = max(0, start); i < traj.total(); ++i, ++index)
-                writePose(cv::format(files_format.c_str(), index), traj.at<Affine3f>(i), tag);
+                writePose(cv::format(files_format.c_str(), index), traj.at<Affine3f>((int)i), tag);
 
         if (traj.depth() == CV_64F)
             for(size_t i = 0, index = max(0, start); i < traj.total(); ++i, ++index)
-                writePose(cv::format(files_format.c_str(), index), traj.at<Affine3d>(i), tag);
+                writePose(cv::format(files_format.c_str(), index), traj.at<Affine3d>((int)i), tag);
     }
 
     CV_Assert(!"Unsupported array kind");
diff --git a/modules/viz/src/vtk/vtkCloudMatSink.cpp b/modules/viz/src/vtk/vtkCloudMatSink.cpp
index 7f47022c34..8bd1011323 100644
--- a/modules/viz/src/vtk/vtkCloudMatSink.cpp
+++ b/modules/viz/src/vtk/vtkCloudMatSink.cpp
@@ -79,11 +79,11 @@ void cv::viz::vtkCloudMatSink::WriteData()
 
         if (cloud.depth() == CV_32F)
             for(size_t i = 0; i < cloud.total(); ++i)
-                *fdata++ = Vec3d(points_Data->GetPoint(i));
+                *fdata++ = Vec3d(points_Data->GetPoint((vtkIdType)i));
 
         if (cloud.depth() == CV_64F)
             for(size_t i = 0; i < cloud.total(); ++i)
-                *ddata++ = Vec3d(points_Data->GetPoint(i));
+                *ddata++ = Vec3d(points_Data->GetPoint((vtkIdType)i));
     }
     else
         cloud.release();
@@ -101,7 +101,7 @@ void cv::viz::vtkCloudMatSink::WriteData()
         Mat buffer(cloud.size(), CV_64FC(channels));
         Vec3d *cptr = buffer.ptr<Vec3d>();
         for(size_t i = 0; i < buffer.total(); ++i)
-            *cptr++ = Vec3d(scalars_data->GetTuple(i));
+            *cptr++ = Vec3d(scalars_data->GetTuple((vtkIdType)i));
 
         buffer.convertTo(colors, CV_8U, vtktype == VTK_FLOAT || VTK_FLOAT == VTK_DOUBLE ?  255.0 : 1.0);
     }
@@ -121,7 +121,7 @@ void cv::viz::vtkCloudMatSink::WriteData()
         Mat buffer(cloud.size(), CV_64FC(channels));
         Vec3d *cptr = buffer.ptr<Vec3d>();
         for(size_t i = 0; i < buffer.total(); ++i)
-            *cptr++ = Vec3d(normals_data->GetTuple(i));
+            *cptr++ = Vec3d(normals_data->GetTuple((vtkIdType)i));
 
         buffer.convertTo(normals, vtktype == VTK_FLOAT ? CV_32F : CV_64F);
     }
@@ -140,7 +140,7 @@ void cv::viz::vtkCloudMatSink::WriteData()
         Mat buffer(cloud.size(), CV_64FC2);
         Vec2d *cptr = buffer.ptr<Vec2d>();
         for(size_t i = 0; i < buffer.total(); ++i)
-            *cptr++ = Vec2d(coords_data->GetTuple(i));
+            *cptr++ = Vec2d(coords_data->GetTuple((vtkIdType)i));
 
         buffer.convertTo(tcoords, vtktype == VTK_FLOAT ? CV_32F : CV_64F);
 
diff --git a/modules/viz/src/vtk/vtkCloudMatSource.cpp b/modules/viz/src/vtk/vtkCloudMatSource.cpp
index 74d01bbd01..1d8ab7894c 100644
--- a/modules/viz/src/vtk/vtkCloudMatSource.cpp
+++ b/modules/viz/src/vtk/vtkCloudMatSource.cpp
@@ -185,8 +185,8 @@ int cv::viz::vtkCloudMatSource::filterNanCopy(const Mat& cloud)
     CV_DbgAssert(DataType<_Tp>::depth == cloud.depth());
     points = vtkSmartPointer<vtkPoints>::New();
     points->SetDataType(VtkDepthTraits<_Tp>::data_type);
-    points->Allocate(cloud.total());
-    points->SetNumberOfPoints(cloud.total());
+    points->Allocate((vtkIdType)cloud.total());
+    points->SetNumberOfPoints((vtkIdType)cloud.total());
 
     int s_chs = cloud.channels();
     int total = 0;
diff --git a/modules/viz/src/vtk/vtkTrajectorySource.cpp b/modules/viz/src/vtk/vtkTrajectorySource.cpp
index e098a1d553..2036e09af3 100644
--- a/modules/viz/src/vtk/vtkTrajectorySource.cpp
+++ b/modules/viz/src/vtk/vtkTrajectorySource.cpp
@@ -64,19 +64,19 @@ void cv::viz::vtkTrajectorySource::SetTrajectory(InputArray _traj)
 
     points = vtkSmartPointer<vtkPoints>::New();
     points->SetDataType(VTK_DOUBLE);
-    points->SetNumberOfPoints(total);
+    points->SetNumberOfPoints((vtkIdType)total);
 
     tensors = vtkSmartPointer<vtkDoubleArray>::New();
     tensors->SetNumberOfComponents(9);
-    tensors->SetNumberOfTuples(total);
+    tensors->SetNumberOfTuples((vtkIdType)total);
 
     for(size_t i = 0; i < total; ++i, ++dpath)
     {
         Matx33d R = dpath->rotation().t();  // transposed because of
-        tensors->SetTuple(i, R.val);        // column major order
+        tensors->SetTuple((vtkIdType)i, R.val);        // column major order
 
         Vec3d p = dpath->translation();
-        points->SetPoint(i, p.val);
+        points->SetPoint((vtkIdType)i, p.val);
     }
 }
 
@@ -85,7 +85,7 @@ cv::Mat cv::viz::vtkTrajectorySource::ExtractPoints(InputArray _traj)
     CV_Assert(_traj.kind() == _InputArray::STD_VECTOR || _traj.kind() == _InputArray::MAT);
     CV_Assert(_traj.type() == CV_32FC(16) || _traj.type() == CV_64FC(16));
 
-    Mat points(1, _traj.total(), CV_MAKETYPE(_traj.depth(), 3));
+    Mat points(1, (int)_traj.total(), CV_MAKETYPE(_traj.depth(), 3));
     const Affine3d* dpath = _traj.getMat().ptr<Affine3d>();
     const Affine3f* fpath = _traj.getMat().ptr<Affine3f>();
 
diff --git a/modules/viz/test/tests_simple.cpp b/modules/viz/test/tests_simple.cpp
index f84b60a475..c595affba7 100644
--- a/modules/viz/test/tests_simple.cpp
+++ b/modules/viz/test/tests_simple.cpp
@@ -81,7 +81,7 @@ TEST(Viz, show_cloud_masked)
     Mat dragon_cloud = readCloud(get_dragon_ply_file_path());
 
     Vec3f qnan = Vec3f::all(std::numeric_limits<float>::quiet_NaN());
-    for(size_t i = 0; i < dragon_cloud.total(); ++i)
+    for(int i = 0; i < (int)dragon_cloud.total(); ++i)
         if (i % 15 != 0)
             dragon_cloud.at<Vec3f>(i) = qnan;
 
@@ -170,7 +170,7 @@ TEST(Viz, show_textured_mesh)
         tcoords.push_back(Vec2d(1.0, i/64.0));
     }
 
-    for(size_t i = 0; i < points.size()/2-1; ++i)
+    for(int i = 0; i < (int)points.size()/2-1; ++i)
     {
         int polys[] = {3, 2*i, 2*i+1, 2*i+2, 3, 2*i+1, 2*i+2, 2*i+3};
         polygons.insert(polygons.end(), polys, polys + sizeof(polys)/sizeof(polys[0]));
@@ -194,7 +194,7 @@ TEST(Viz, show_textured_mesh)
 TEST(Viz, show_polyline)
 {
     Mat polyline(1, 32, CV_64FC3);
-    for(size_t i = 0; i < polyline.total(); ++i)
+    for(int i = 0; i < (int)polyline.total(); ++i)
         polyline.at<Vec3d>(i) = Vec3d(i/16.0, cos(i * CV_PI/6), sin(i * CV_PI/6));
 
     Viz3d viz("show_polyline");
@@ -222,13 +222,14 @@ TEST(Viz, show_sampled_normals)
 TEST(Viz, show_trajectories)
 {
     std::vector<Affine3d> path = generate_test_trajectory<double>(), sub0, sub1, sub2, sub3, sub4, sub5;
+    int size =(int)path.size();
 
-    Mat(path).rowRange(0, path.size()/10+1).copyTo(sub0);
-    Mat(path).rowRange(path.size()/10, path.size()/5+1).copyTo(sub1);
-    Mat(path).rowRange(path.size()/5, 11*path.size()/12).copyTo(sub2);
-    Mat(path).rowRange(11*path.size()/12, path.size()).copyTo(sub3);
-    Mat(path).rowRange(3*path.size()/4, 33*path.size()/40).copyTo(sub4);
-    Mat(path).rowRange(33*path.size()/40, 9*path.size()/10).copyTo(sub5);
+    Mat(path).rowRange(0, size/10+1).copyTo(sub0);
+    Mat(path).rowRange(size/10, size/5+1).copyTo(sub1);
+    Mat(path).rowRange(size/5, 11*size/12).copyTo(sub2);
+    Mat(path).rowRange(11*size/12, size).copyTo(sub3);
+    Mat(path).rowRange(3*size/4, 33*size/40).copyTo(sub4);
+    Mat(path).rowRange(33*size/40, 9*size/10).copyTo(sub5);
     Matx33d K(1024.0, 0.0, 320.0, 0.0, 1024.0, 240.0, 0.0, 0.0, 1.0);
 
     Viz3d viz("show_trajectories");
@@ -259,7 +260,7 @@ TEST(Viz, show_trajectory_reposition)
 
     Viz3d viz("show_trajectory_reposition_to_origin");
     viz.showWidget("coos", WCoordinateSystem());
-    viz.showWidget("sub3", WTrajectory(Mat(path).rowRange(0, path.size()/3), WTrajectory::BOTH, 0.2, Color::brown()), path.front().inv());
+    viz.showWidget("sub3", WTrajectory(Mat(path).rowRange(0, (int)path.size()/3), WTrajectory::BOTH, 0.2, Color::brown()), path.front().inv());
     viz.showWidget("text2d", WText("Trajectory resposition to origin", Point(20, 20), 20, Color::green()));
     viz.spin();
 }