diff --git a/modules/core/include/opencv2/core/operations.hpp b/modules/core/include/opencv2/core/operations.hpp
index 3d2812ba52..ae279a2e05 100644
--- a/modules/core/include/opencv2/core/operations.hpp
+++ b/modules/core/include/opencv2/core/operations.hpp
@@ -86,6 +86,11 @@
 
 #include <limits>
 
+#ifdef _MSC_VER
+# pragma warning(push)
+# pragma warning(disable:4127) //conditional expression is constant
+#endif
+
 namespace cv
 {
 
@@ -3950,5 +3955,9 @@ template<typename _Tp> inline void AlgorithmInfo::addParam(Algorithm& algo, cons
 
 }
 
+#ifdef _MSC_VER
+# pragma warning(pop)
+#endif
+
 #endif // __cplusplus
 #endif
diff --git a/modules/core/src/parallel.cpp b/modules/core/src/parallel.cpp
index c31edede85..014b107106 100644
--- a/modules/core/src/parallel.cpp
+++ b/modules/core/src/parallel.cpp
@@ -362,8 +362,8 @@ void cv::setNumThreads( int threads )
     else if (pplScheduler == 0 || 1 + pplScheduler->GetNumberOfVirtualProcessors() != (unsigned int)threads)
     {
         pplScheduler = Concurrency::Scheduler::Create(Concurrency::SchedulerPolicy(2,
-                       Concurrency::PolicyElementKey::MinConcurrency, threads-1,
-                       Concurrency::PolicyElementKey::MaxConcurrency, threads-1));
+                       Concurrency::MinConcurrency, threads-1,
+                       Concurrency::MaxConcurrency, threads-1));
     }
 
 #endif
diff --git a/modules/flann/src/miniflann.cpp b/modules/flann/src/miniflann.cpp
index 7d1bce4c08..3747102728 100644
--- a/modules/flann/src/miniflann.cpp
+++ b/modules/flann/src/miniflann.cpp
@@ -500,7 +500,7 @@ int runRadiusSearch_(void* index, const Mat& query, Mat& indices, Mat& dists,
     ::cvflann::Matrix<DistanceType> _dists((DistanceType*)dists.data, dists.rows, dists.cols);
 
     return ((IndexType*)index)->radiusSearch(_query, _indices, _dists,
-                                            saturate_cast<DistanceType>(radius),
+                                            saturate_cast<float>(radius),
                                             (const ::cvflann::SearchParams&)get_params(params));
 }
 
diff --git a/modules/imgproc/src/color.cpp b/modules/imgproc/src/color.cpp
index 10fa86788d..e85acea3f3 100644
--- a/modules/imgproc/src/color.cpp
+++ b/modules/imgproc/src/color.cpp
@@ -1387,8 +1387,8 @@ struct RGB2Lab_f
               C6 = coeffs[6], C7 = coeffs[7], C8 = coeffs[8];
         n *= 3;
 
-        static const float _1_3 = 1.0 / 3.0;
-        static const double _a = 16.0 / 116;
+        static const float _1_3 = 1.0f / 3.0f;
+        static const float _a = 16.0f / 116.0f;
         for (i = 0; i < n; i += 3, src += scn )
         {
             float R = clip(src[0]);
@@ -1409,11 +1409,11 @@ struct RGB2Lab_f
             float Y = R*C3 + G*C4 + B*C5;
             float Z = R*C6 + G*C7 + B*C8;
 
-            float FX = X > 0.008856 ? pow(X, _1_3) : (7.787f * X + _a);
-            float FY = Y > 0.008856 ? pow(Y, _1_3) : (7.787f * Y + _a);
-            float FZ = Z > 0.008856 ? pow(Z, _1_3) : (7.787f * Z + _a);
+            float FX = X > 0.008856f ? pow(X, _1_3) : (7.787f * X + _a);
+            float FY = Y > 0.008856f ? pow(Y, _1_3) : (7.787f * Y + _a);
+            float FZ = Z > 0.008856f ? pow(Z, _1_3) : (7.787f * Z + _a);
 
-            float L = Y > 0.008856 ? (116.f * FY - 16.f) : (903.3 * Y);
+            float L = Y > 0.008856f ? (116.f * FY - 16.f) : (903.3f * Y);
             float a = 500.f * (FX - FY);
             float b = 200.f * (FY - FZ);