diff --git a/modules/gpu/src/nvidia/NCVHaarObjectDetection.cu b/modules/gpu/src/nvidia/NCVHaarObjectDetection.cu
index 2c6f65727e..f17e169b83 100644
--- a/modules/gpu/src/nvidia/NCVHaarObjectDetection.cu
+++ b/modules/gpu/src/nvidia/NCVHaarObjectDetection.cu
@@ -1,7 +1,7 @@
 /*M///////////////////////////////////////////////////////////////////////////////////////
 //
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 
-// 
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
 //  By downloading, copying, installing or using the software you agree to this license.
 //  If you do not agree to this license, do not download, install,
 //  copy or use the software.
@@ -198,7 +198,7 @@ __device__ HaarClassifierNode128 getClassifierNode(Ncv32u iNode, HaarClassifierN
 
 
 template <NcvBool tbCacheTextureCascade>
-__device__ void getFeature(Ncv32u iFeature, HaarFeature64 *d_Features, 
+__device__ void getFeature(Ncv32u iFeature, HaarFeature64 *d_Features,
                            Ncv32f *weight,
                            Ncv32u *rectX, Ncv32u *rectY, Ncv32u *rectWidth, Ncv32u *rectHeight)
 {
@@ -321,9 +321,9 @@ __global__ void applyHaarClassifierAnchorParallel(Ncv32u *d_IImg, Ncv32u IImgStr
                  d_inMask != d_outMask &&
                  d_inMask[maskOffset] == OBJDET_MASK_ELEMENT_INVALID_32U))
             {
-                if (tbDoAtomicCompaction) 
+                if (tbDoAtomicCompaction)
                 {
-                    bInactiveThread = true; 
+                    bInactiveThread = true;
                 }
                 else
                 {
@@ -451,7 +451,7 @@ __global__ void applyHaarClassifierAnchorParallel(Ncv32u *d_IImg, Ncv32u IImgStr
     }
 }
 
-
+
 template <NcvBool tbCacheTextureIImg,
           NcvBool tbCacheTextureCascade,
           NcvBool tbDoAtomicCompaction>
@@ -565,14 +565,7 @@ __global__ void applyHaarClassifierClassifierParallel(Ncv32u *d_IImg, Ncv32u IIm
             curRootNodeOffset += NUM_THREADS_CLASSIFIERPARALLEL;
         }
 
-        struct functorAddValues
-        {
-            __device__ void reduce(Ncv32f &in1out, Ncv32f &in2)
-            {
-                in1out += in2;
-            }
-        };
-        Ncv32f finalStageSum = subReduce<Ncv32f, functorAddValues, NUM_THREADS_CLASSIFIERPARALLEL>(curStageSum);
+        Ncv32f finalStageSum = subReduce<Ncv32f, functorAddValues<Ncv32f>, NUM_THREADS_CLASSIFIERPARALLEL>(curStageSum);
 
         if (finalStageSum < stageThreshold)
         {
@@ -1125,7 +1118,7 @@ NCVStatus ncvApplyHaarClassifierCascade_device(NCVMatrix<Ncv32u> &d_integralImag
     }
     if (curStop > compactEveryNstage && curStop - stageMiddleSwitch > compactEveryNstage / 2)
     {
-        pixParallelStageStops[pixParallelStageStops.size()-1] = 
+        pixParallelStageStops[pixParallelStageStops.size()-1] =
             (stageMiddleSwitch - (curStop - 2 * compactEveryNstage)) / 2;
     }
     pixParallelStageStops.push_back(stageMiddleSwitch);
diff --git a/modules/gpu/src/nvidia/core/NCV.cu b/modules/gpu/src/nvidia/core/NCV.cu
index a5af00a8ea..f8be5c8bad 100644
--- a/modules/gpu/src/nvidia/core/NCV.cu
+++ b/modules/gpu/src/nvidia/core/NCV.cu
@@ -1,7 +1,7 @@
 /*M///////////////////////////////////////////////////////////////////////////////////////
 //
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 
-// 
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
 //  By downloading, copying, installing or using the software you agree to this license.
 //  If you do not agree to this license, do not download, install,
 //  copy or use the software.
@@ -278,6 +278,7 @@ NCVMemStackAllocator::NCVMemStackAllocator(NCVMemoryType memT, size_t capacity,
 {
     NcvBool bProperAlignment = (alignment & (alignment-1)) == 0;
     ncvAssertPrintCheck(bProperAlignment, "NCVMemStackAllocator ctor:: _alignment not power of 2");
+    ncvAssertPrintCheck(memT != NCVMemoryTypeNone, "NCVMemStackAllocator ctor:: Incorrect allocator type");
 
     allocBegin = NULL;
 
@@ -294,7 +295,8 @@ NCVMemStackAllocator::NCVMemStackAllocator(NCVMemoryType memT, size_t capacity,
             break;
         case NCVMemoryTypeHostPageable:
             allocBegin = (Ncv8u *)malloc(capacity);
-            break;
+            break;
+        default:;
         }
     }
     else
@@ -334,7 +336,8 @@ NCVMemStackAllocator::~NCVMemStackAllocator()
                 break;
             case NCVMemoryTypeHostPageable:
                 free(allocBegin);
-                break;
+                break;
+            default:;
             }
         }
 
@@ -454,7 +457,8 @@ NCVStatus NCVMemNativeAllocator::alloc(NCVMemSegment &seg, size_t size)
         break;
     case NCVMemoryTypeHostPageable:
         seg.begin.ptr = (Ncv8u *)malloc(size);
-        break;
+        break;
+    default:;
     }
 
     this->currentSize += alignUp(size, this->_alignment);
@@ -486,7 +490,8 @@ NCVStatus NCVMemNativeAllocator::dealloc(NCVMemSegment &seg)
         break;
     case NCVMemoryTypeHostPageable:
         free(seg.begin.ptr);
-        break;
+        break;
+    default:;
     }
 
     seg.clear();
@@ -568,13 +573,13 @@ typedef struct _NcvTimeMoment NcvTimeMoment;
         return 1000.0 * 2 * ((t2->moment) - (t1->moment)) / (t1->freq + t2->freq);
     }
 
-#elif defined(__GNUC__) 
+#elif defined(__GNUC__)
 
     #include <sys/time.h>
 
     typedef struct _NcvTimeMoment
     {
-        struct timeval tv; 
+        struct timeval tv;
         struct timezone tz;
     } NcvTimeMoment;
 
diff --git a/modules/gpu/src/nvidia/core/NCVAlg.hpp b/modules/gpu/src/nvidia/core/NCVAlg.hpp
index 0dda7c1dcc..7c6cebd08d 100644
--- a/modules/gpu/src/nvidia/core/NCVAlg.hpp
+++ b/modules/gpu/src/nvidia/core/NCVAlg.hpp
@@ -1,7 +1,7 @@
 /*M///////////////////////////////////////////////////////////////////////////////////////
 //
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 
-// 
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
 //  By downloading, copying, installing or using the software you agree to this license.
 //  If you do not agree to this license, do not download, install,
 //  copy or use the software.
@@ -52,6 +52,36 @@ static T divUp(T a, T b)
 }
 
 
+template<typename T>
+struct functorAddValues
+{
+    static __device__ __inline__ void reduce(T &in1out, T &in2)
+    {
+        in1out += in2;
+    }
+};
+
+
+template<typename T>
+struct functorMinValues
+{
+    static __device__ __inline__ void reduce(T &in1out, T &in2)
+    {
+        in1out = in1out > in2 ? in2 : in1out;
+    }
+};
+
+
+template<typename T>
+struct functorMaxValues
+{
+    static __device__ __inline__ void reduce(T &in1out, T &in2)
+    {
+        in1out = in1out > in2 ? in1out : in2;
+    }
+};
+
+
 template<typename Tdata, class Tfunc, Ncv32u nThreads>
 static __device__ Tdata subReduce(Tdata threadElem)
 {
diff --git a/modules/gpu/src/nvidia/core/NCVPyramid.cu b/modules/gpu/src/nvidia/core/NCVPyramid.cu
index 20e52e580b..463178362c 100644
--- a/modules/gpu/src/nvidia/core/NCVPyramid.cu
+++ b/modules/gpu/src/nvidia/core/NCVPyramid.cu
@@ -1,7 +1,7 @@
 /*M///////////////////////////////////////////////////////////////////////////////////////
 //
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 
-// 
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
 //  By downloading, copying, installing or using the software you agree to this license.
 //  If you do not agree to this license, do not download, install,
 //  copy or use the software.
@@ -46,6 +46,7 @@
 #include "NCVPyramid.hpp"
 #include "NCVPixelOperations.hpp"
 
+#ifdef _WIN32
 
 template<typename T, Ncv32u CN> struct __average4_CN {static T _average4_CN(const T &p00, const T &p01, const T &p10, const T &p11);};
 
@@ -394,4 +395,6 @@ template class NCVImagePyramid<uint3>;
 template class NCVImagePyramid<uint4>;
 template class NCVImagePyramid<float1>;
 template class NCVImagePyramid<float3>;
-template class NCVImagePyramid<float4>;
+template class NCVImagePyramid<float4>;
+
+#endif //_WIN32
diff --git a/modules/gpu/src/nvidia/core/NCVPyramid.hpp b/modules/gpu/src/nvidia/core/NCVPyramid.hpp
index 92cf90fab9..1885b17235 100644
--- a/modules/gpu/src/nvidia/core/NCVPyramid.hpp
+++ b/modules/gpu/src/nvidia/core/NCVPyramid.hpp
@@ -1,7 +1,7 @@
 /*M///////////////////////////////////////////////////////////////////////////////////////
 //
-// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. 
-// 
+// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
 //  By downloading, copying, installing or using the software you agree to this license.
 //  If you do not agree to this license, do not download, install,
 //  copy or use the software.
@@ -46,7 +46,8 @@
 #include <memory>
 #include <vector>
 #include "NCV.hpp"
-
+
+#ifdef _WIN32
 
 template <class T>
 class NCV_EXPORTS NCVMatrixStack
@@ -91,7 +92,8 @@ private:
     const NCVMatrix<T> *layer0;
     NCVMatrixStack<T> pyramid;
     Ncv32u nLayers;
-};
-
+};
+
+#endif //_WIN32
 
 #endif //_ncvpyramid_hpp_