diff --git a/modules/features2d/include/opencv2/features2d.hpp b/modules/features2d/include/opencv2/features2d.hpp
index 06e15ac8d1..1ba4f0da26 100644
--- a/modules/features2d/include/opencv2/features2d.hpp
+++ b/modules/features2d/include/opencv2/features2d.hpp
@@ -208,14 +208,14 @@ public:
 
     CV_WRAP void read( const String& fileName );
 
-    virtual void write( FileStorage&) const;
+    virtual void write( FileStorage&) const CV_OVERRIDE;
 
     // see corresponding cv::Algorithm method
-    CV_WRAP virtual void read( const FileNode&);
+    CV_WRAP virtual void read( const FileNode&) CV_OVERRIDE;
 
     //! Return true if detector object is empty
-    CV_WRAP virtual bool empty() const;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual bool empty() const CV_OVERRIDE;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 
     // see corresponding cv::Algorithm method
     CV_WRAP inline void write(const Ptr<FileStorage>& fs, const String& name = String()) const { Algorithm::write(fs, name); }
@@ -280,7 +280,7 @@ public:
     CV_WRAP static Ptr<BRISK> create(int thresh, int octaves, const std::vector<float> &radiusList,
         const std::vector<int> &numberList, float dMax=5.85f, float dMin=8.2f,
         const std::vector<int>& indexChange=std::vector<int>());
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @brief Class implementing the ORB (*oriented BRIEF*) keypoint detector and descriptor extractor
@@ -355,7 +355,7 @@ public:
 
     CV_WRAP virtual void setFastThreshold(int fastThreshold) = 0;
     CV_WRAP virtual int getFastThreshold() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @brief Maximally stable extremal region extractor
@@ -415,7 +415,7 @@ public:
 
     CV_WRAP virtual void setPass2Only(bool f) = 0;
     CV_WRAP virtual bool getPass2Only() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @overload */
@@ -471,7 +471,7 @@ public:
 
     CV_WRAP virtual void setType(int type) = 0;
     CV_WRAP virtual int getType() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @overload */
@@ -526,7 +526,7 @@ public:
 
     CV_WRAP virtual void setType(int type) = 0;
     CV_WRAP virtual int getType() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @brief Wrapping class for feature detection using the goodFeaturesToTrack function. :
@@ -555,7 +555,7 @@ public:
 
     CV_WRAP virtual void setK(double k) = 0;
     CV_WRAP virtual double getK() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @brief Class for extracting blobs from an image. :
@@ -622,7 +622,7 @@ public:
 
   CV_WRAP static Ptr<SimpleBlobDetector>
     create(const SimpleBlobDetector::Params &parameters = SimpleBlobDetector::Params());
-  CV_WRAP virtual String getDefaultName() const;
+  CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 //! @} features2d_main
@@ -679,7 +679,7 @@ public:
 
     CV_WRAP virtual void setDiffusivity(int diff) = 0;
     CV_WRAP virtual int getDiffusivity() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 /** @brief Class implementing the AKAZE keypoint detector and descriptor extractor, described in @cite ANB13.
@@ -747,7 +747,7 @@ public:
 
     CV_WRAP virtual void setDiffusivity(int diff) = 0;
     CV_WRAP virtual int getDiffusivity() const = 0;
-    CV_WRAP virtual String getDefaultName() const;
+    CV_WRAP virtual String getDefaultName() const CV_OVERRIDE;
 };
 
 //! @} features2d_main
@@ -857,11 +857,11 @@ public:
 
     /** @brief Clears the train descriptor collections.
      */
-    CV_WRAP virtual void clear();
+    CV_WRAP virtual void clear() CV_OVERRIDE;
 
     /** @brief Returns true if there are no train descriptors in the both collections.
      */
-    CV_WRAP virtual bool empty() const;
+    CV_WRAP virtual bool empty() const CV_OVERRIDE;
 
     /** @brief Returns true if the descriptor matcher supports masking permissible matches.
      */
@@ -991,9 +991,9 @@ public:
     }
     // Reads matcher object from a file node
     // see corresponding cv::Algorithm method
-    CV_WRAP virtual void read( const FileNode& );
+    CV_WRAP virtual void read( const FileNode& ) CV_OVERRIDE;
     // Writes matcher object to a file storage
-    virtual void write( FileStorage& ) const;
+    virtual void write( FileStorage& ) const CV_OVERRIDE;
 
     /** @brief Clones the matcher.
 
@@ -1086,7 +1086,7 @@ public:
 
     virtual ~BFMatcher() {}
 
-    virtual bool isMaskSupported() const { return true; }
+    virtual bool isMaskSupported() const CV_OVERRIDE { return true; }
 
     /** @brief Brute-force matcher create method.
     @param normType One of NORM_L1, NORM_L2, NORM_HAMMING, NORM_HAMMING2. L1 and L2 norms are
@@ -1102,12 +1102,12 @@ public:
      */
     CV_WRAP static Ptr<BFMatcher> create( int normType=NORM_L2, bool crossCheck=false ) ;
 
-    virtual Ptr<DescriptorMatcher> clone( bool emptyTrainData=false ) const;
+    virtual Ptr<DescriptorMatcher> clone( bool emptyTrainData=false ) const CV_OVERRIDE;
 protected:
     virtual void knnMatchImpl( InputArray queryDescriptors, std::vector<std::vector<DMatch> >& matches, int k,
-        InputArrayOfArrays masks=noArray(), bool compactResult=false );
+        InputArrayOfArrays masks=noArray(), bool compactResult=false ) CV_OVERRIDE;
     virtual void radiusMatchImpl( InputArray queryDescriptors, std::vector<std::vector<DMatch> >& matches, float maxDistance,
-        InputArrayOfArrays masks=noArray(), bool compactResult=false );
+        InputArrayOfArrays masks=noArray(), bool compactResult=false ) CV_OVERRIDE;
 
     int normType;
     bool crossCheck;
@@ -1128,29 +1128,29 @@ public:
     CV_WRAP FlannBasedMatcher( const Ptr<flann::IndexParams>& indexParams=makePtr<flann::KDTreeIndexParams>(),
                        const Ptr<flann::SearchParams>& searchParams=makePtr<flann::SearchParams>() );
 
-    virtual void add( InputArrayOfArrays descriptors );
-    virtual void clear();
+    virtual void add( InputArrayOfArrays descriptors ) CV_OVERRIDE;
+    virtual void clear() CV_OVERRIDE;
 
     // Reads matcher object from a file node
-    virtual void read( const FileNode& );
+    virtual void read( const FileNode& ) CV_OVERRIDE;
     // Writes matcher object to a file storage
-    virtual void write( FileStorage& ) const;
+    virtual void write( FileStorage& ) const CV_OVERRIDE;
 
-    virtual void train();
-    virtual bool isMaskSupported() const;
+    virtual void train() CV_OVERRIDE;
+    virtual bool isMaskSupported() const CV_OVERRIDE;
 
     CV_WRAP static Ptr<FlannBasedMatcher> create();
 
-    virtual Ptr<DescriptorMatcher> clone( bool emptyTrainData=false ) const;
+    virtual Ptr<DescriptorMatcher> clone( bool emptyTrainData=false ) const CV_OVERRIDE;
 protected:
     static void convertToDMatches( const DescriptorCollection& descriptors,
                                    const Mat& indices, const Mat& distances,
                                    std::vector<std::vector<DMatch> >& matches );
 
     virtual void knnMatchImpl( InputArray queryDescriptors, std::vector<std::vector<DMatch> >& matches, int k,
-        InputArrayOfArrays masks=noArray(), bool compactResult=false );
+        InputArrayOfArrays masks=noArray(), bool compactResult=false ) CV_OVERRIDE;
     virtual void radiusMatchImpl( InputArray queryDescriptors, std::vector<std::vector<DMatch> >& matches, float maxDistance,
-        InputArrayOfArrays masks=noArray(), bool compactResult=false );
+        InputArrayOfArrays masks=noArray(), bool compactResult=false ) CV_OVERRIDE;
 
     Ptr<flann::IndexParams> indexParams;
     Ptr<flann::SearchParams> searchParams;
@@ -1327,8 +1327,8 @@ public:
     virtual ~BOWKMeansTrainer();
 
     // Returns trained vocabulary (i.e. cluster centers).
-    CV_WRAP virtual Mat cluster() const;
-    CV_WRAP virtual Mat cluster( const Mat& descriptors ) const;
+    CV_WRAP virtual Mat cluster() const CV_OVERRIDE;
+    CV_WRAP virtual Mat cluster( const Mat& descriptors ) const CV_OVERRIDE;
 
 protected:
 
diff --git a/modules/features2d/src/agast.cpp b/modules/features2d/src/agast.cpp
index e77d556476..ab01b67805 100644
--- a/modules/features2d/src/agast.cpp
+++ b/modules/features2d/src/agast.cpp
@@ -7941,14 +7941,14 @@ void AGAST(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, boo
     AGAST(_img, keypoints, threshold, nonmax_suppression, AgastFeatureDetector::OAST_9_16);
 }
 
-class AgastFeatureDetector_Impl : public AgastFeatureDetector
+class AgastFeatureDetector_Impl CV_FINAL : public AgastFeatureDetector
 {
 public:
     AgastFeatureDetector_Impl( int _threshold, bool _nonmaxSuppression, int _type )
     : threshold(_threshold), nonmaxSuppression(_nonmaxSuppression), type((short)_type)
     {}
 
-    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask )
+    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask ) CV_OVERRIDE
     {
         CV_INSTRUMENT_REGION()
 
@@ -7986,14 +7986,14 @@ public:
         return 0;
     }
 
-    void setThreshold(int threshold_) { threshold = threshold_; }
-    int getThreshold() const { return threshold; }
+    void setThreshold(int threshold_) CV_OVERRIDE { threshold = threshold_; }
+    int getThreshold() const CV_OVERRIDE { return threshold; }
 
-    void setNonmaxSuppression(bool f) { nonmaxSuppression = f; }
-    bool getNonmaxSuppression() const { return nonmaxSuppression; }
+    void setNonmaxSuppression(bool f) CV_OVERRIDE { nonmaxSuppression = f; }
+    bool getNonmaxSuppression() const CV_OVERRIDE { return nonmaxSuppression; }
 
-    void setType(int type_) { type = type_; }
-    int getType() const { return type; }
+    void setType(int type_) CV_OVERRIDE { type = type_; }
+    int getType() const CV_OVERRIDE { return type; }
 
     int threshold;
     bool nonmaxSuppression;
diff --git a/modules/features2d/src/akaze.cpp b/modules/features2d/src/akaze.cpp
index c63bb74be3..d5cc25d358 100644
--- a/modules/features2d/src/akaze.cpp
+++ b/modules/features2d/src/akaze.cpp
@@ -72,34 +72,34 @@ namespace cv
         {
         }
 
-        virtual ~AKAZE_Impl()
+        virtual ~AKAZE_Impl() CV_OVERRIDE
         {
 
         }
 
-        void setDescriptorType(int dtype) { descriptor = dtype; }
-        int getDescriptorType() const { return descriptor; }
+        void setDescriptorType(int dtype) CV_OVERRIDE { descriptor = dtype; }
+        int getDescriptorType() const CV_OVERRIDE { return descriptor; }
 
-        void setDescriptorSize(int dsize) { descriptor_size = dsize; }
-        int getDescriptorSize() const { return descriptor_size; }
+        void setDescriptorSize(int dsize) CV_OVERRIDE { descriptor_size = dsize; }
+        int getDescriptorSize() const CV_OVERRIDE { return descriptor_size; }
 
-        void setDescriptorChannels(int dch) { descriptor_channels = dch; }
-        int getDescriptorChannels() const { return descriptor_channels; }
+        void setDescriptorChannels(int dch) CV_OVERRIDE { descriptor_channels = dch; }
+        int getDescriptorChannels() const CV_OVERRIDE { return descriptor_channels; }
 
-        void setThreshold(double threshold_) { threshold = (float)threshold_; }
-        double getThreshold() const { return threshold; }
+        void setThreshold(double threshold_) CV_OVERRIDE { threshold = (float)threshold_; }
+        double getThreshold() const CV_OVERRIDE { return threshold; }
 
-        void setNOctaves(int octaves_) { octaves = octaves_; }
-        int getNOctaves() const { return octaves; }
+        void setNOctaves(int octaves_) CV_OVERRIDE { octaves = octaves_; }
+        int getNOctaves() const CV_OVERRIDE { return octaves; }
 
-        void setNOctaveLayers(int octaveLayers_) { sublevels = octaveLayers_; }
-        int getNOctaveLayers() const { return sublevels; }
+        void setNOctaveLayers(int octaveLayers_) CV_OVERRIDE { sublevels = octaveLayers_; }
+        int getNOctaveLayers() const CV_OVERRIDE { return sublevels; }
 
-        void setDiffusivity(int diff_) { diffusivity = diff_; }
-        int getDiffusivity() const { return diffusivity; }
+        void setDiffusivity(int diff_) CV_OVERRIDE { diffusivity = diff_; }
+        int getDiffusivity() const CV_OVERRIDE { return diffusivity; }
 
         // returns the descriptor size in bytes
-        int descriptorSize() const
+        int descriptorSize() const CV_OVERRIDE
         {
             switch (descriptor)
             {
@@ -127,7 +127,7 @@ namespace cv
         }
 
         // returns the descriptor type
-        int descriptorType() const
+        int descriptorType() const CV_OVERRIDE
         {
             switch (descriptor)
             {
@@ -145,7 +145,7 @@ namespace cv
         }
 
         // returns the default norm type
-        int defaultNorm() const
+        int defaultNorm() const CV_OVERRIDE
         {
             switch (descriptor)
             {
@@ -165,7 +165,7 @@ namespace cv
         void detectAndCompute(InputArray image, InputArray mask,
                               std::vector<KeyPoint>& keypoints,
                               OutputArray descriptors,
-                              bool useProvidedKeypoints)
+                              bool useProvidedKeypoints) CV_OVERRIDE
         {
             CV_INSTRUMENT_REGION()
 
@@ -204,7 +204,7 @@ namespace cv
             }
         }
 
-        void write(FileStorage& fs) const
+        void write(FileStorage& fs) const CV_OVERRIDE
         {
             writeFormat(fs);
             fs << "descriptor" << descriptor;
@@ -216,7 +216,7 @@ namespace cv
             fs << "diffusivity" << diffusivity;
         }
 
-        void read(const FileNode& fn)
+        void read(const FileNode& fn) CV_OVERRIDE
         {
             descriptor = (int)fn["descriptor"];
             descriptor_channels = (int)fn["descriptor_channels"];
diff --git a/modules/features2d/src/blobdetector.cpp b/modules/features2d/src/blobdetector.cpp
index d3f6a6d709..ffcc431b58 100644
--- a/modules/features2d/src/blobdetector.cpp
+++ b/modules/features2d/src/blobdetector.cpp
@@ -64,8 +64,8 @@ public:
 
   explicit SimpleBlobDetectorImpl(const SimpleBlobDetector::Params &parameters = SimpleBlobDetector::Params());
 
-  virtual void read( const FileNode& fn );
-  virtual void write( FileStorage& fs ) const;
+  virtual void read( const FileNode& fn ) CV_OVERRIDE;
+  virtual void write( FileStorage& fs ) const CV_OVERRIDE;
 
 protected:
   struct CV_EXPORTS Center
@@ -75,7 +75,7 @@ protected:
       double confidence;
   };
 
-  virtual void detect( InputArray image, std::vector<KeyPoint>& keypoints, InputArray mask=noArray() );
+  virtual void detect( InputArray image, std::vector<KeyPoint>& keypoints, InputArray mask=noArray() ) CV_OVERRIDE;
   virtual void findBlobs(InputArray image, InputArray binaryImage, std::vector<Center> &centers) const;
 
   Params params;
diff --git a/modules/features2d/src/brisk.cpp b/modules/features2d/src/brisk.cpp
index 00810a62fd..bacea2b5a4 100644
--- a/modules/features2d/src/brisk.cpp
+++ b/modules/features2d/src/brisk.cpp
@@ -51,7 +51,7 @@
 namespace cv
 {
 
-class BRISK_Impl : public BRISK
+class BRISK_Impl CV_FINAL : public BRISK
 {
 public:
     explicit BRISK_Impl(int thresh=30, int octaves=3, float patternScale=1.0f);
@@ -65,17 +65,17 @@ public:
 
     virtual ~BRISK_Impl();
 
-    int descriptorSize() const
+    int descriptorSize() const CV_OVERRIDE
     {
         return strings_;
     }
 
-    int descriptorType() const
+    int descriptorType() const CV_OVERRIDE
     {
         return CV_8U;
     }
 
-    int defaultNorm() const
+    int defaultNorm() const CV_OVERRIDE
     {
         return NORM_HAMMING;
     }
@@ -90,7 +90,7 @@ public:
     void detectAndCompute( InputArray image, InputArray mask,
                      CV_OUT std::vector<KeyPoint>& keypoints,
                      OutputArray descriptors,
-                     bool useProvidedKeypoints );
+                     bool useProvidedKeypoints ) CV_OVERRIDE;
 
 protected:
 
@@ -151,11 +151,11 @@ private:
 
 
 // a layer in the Brisk detector pyramid
-class CV_EXPORTS BriskLayer
+class BriskLayer
 {
 public:
   // constructor arguments
-  struct CV_EXPORTS CommonParams
+  struct CommonParams
   {
     static const int HALFSAMPLE = 0;
     static const int TWOTHIRDSAMPLE = 1;
@@ -223,7 +223,7 @@ private:
   int pixel_9_16_[25];
 };
 
-class CV_EXPORTS BriskScaleSpace
+class BriskScaleSpace
 {
 public:
   // construct telling the octaves number:
diff --git a/modules/features2d/src/fast.avx2.cpp b/modules/features2d/src/fast.avx2.cpp
index b319ae1c9f..ca0bcb9269 100644
--- a/modules/features2d/src/fast.avx2.cpp
+++ b/modules/features2d/src/fast.avx2.cpp
@@ -50,7 +50,7 @@ namespace cv
 namespace opt_AVX2
 {
 
-class FAST_t_patternSize16_AVX2_Impl: public FAST_t_patternSize16_AVX2
+class FAST_t_patternSize16_AVX2_Impl CV_FINAL: public FAST_t_patternSize16_AVX2
 {
 public:
     FAST_t_patternSize16_AVX2_Impl(int _cols, int _threshold, bool _nonmax_suppression, const int* _pixel):
@@ -61,7 +61,7 @@ public:
         threshold = std::min(std::max(_threshold, 0), 255);
     }
 
-    virtual void process(int &j, const uchar* &ptr, uchar* curr, int* cornerpos, int &ncorners)
+    virtual void process(int &j, const uchar* &ptr, uchar* curr, int* cornerpos, int &ncorners) CV_OVERRIDE
     {
         static const __m256i delta256 = _mm256_broadcastsi128_si256(_mm_set1_epi8((char)(-128))), K16_256 = _mm256_broadcastsi128_si256(_mm_set1_epi8((char)8));
         const __m256i t256 = _mm256_broadcastsi128_si256(_mm_set1_epi8(t256c));
@@ -165,7 +165,7 @@ public:
         _mm256_zeroupper();
     }
 
-    virtual ~FAST_t_patternSize16_AVX2_Impl() {};
+    virtual ~FAST_t_patternSize16_AVX2_Impl() CV_OVERRIDE {};
 
 private:
     int cols;
diff --git a/modules/features2d/src/fast.cpp b/modules/features2d/src/fast.cpp
index 0f2a0cbc9c..106e5802cd 100644
--- a/modules/features2d/src/fast.cpp
+++ b/modules/features2d/src/fast.cpp
@@ -515,14 +515,14 @@ void FAST(InputArray _img, std::vector<KeyPoint>& keypoints, int threshold, bool
 }
 
 
-class FastFeatureDetector_Impl : public FastFeatureDetector
+class FastFeatureDetector_Impl CV_FINAL : public FastFeatureDetector
 {
 public:
     FastFeatureDetector_Impl( int _threshold, bool _nonmaxSuppression, int _type )
     : threshold(_threshold), nonmaxSuppression(_nonmaxSuppression), type((short)_type)
     {}
 
-    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask )
+    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask ) CV_OVERRIDE
     {
         CV_INSTRUMENT_REGION()
 
@@ -563,14 +563,14 @@ public:
         return 0;
     }
 
-    void setThreshold(int threshold_) { threshold = threshold_; }
-    int getThreshold() const { return threshold; }
+    void setThreshold(int threshold_) CV_OVERRIDE { threshold = threshold_; }
+    int getThreshold() const CV_OVERRIDE { return threshold; }
 
-    void setNonmaxSuppression(bool f) { nonmaxSuppression = f; }
-    bool getNonmaxSuppression() const { return nonmaxSuppression; }
+    void setNonmaxSuppression(bool f) CV_OVERRIDE { nonmaxSuppression = f; }
+    bool getNonmaxSuppression() const CV_OVERRIDE { return nonmaxSuppression; }
 
-    void setType(int type_) { type = type_; }
-    int getType() const { return type; }
+    void setType(int type_) CV_OVERRIDE { type = type_; }
+    int getType() const CV_OVERRIDE { return type; }
 
     int threshold;
     bool nonmaxSuppression;
diff --git a/modules/features2d/src/gftt.cpp b/modules/features2d/src/gftt.cpp
index c98e17e16b..1b8010625b 100644
--- a/modules/features2d/src/gftt.cpp
+++ b/modules/features2d/src/gftt.cpp
@@ -44,7 +44,7 @@
 namespace cv
 {
 
-class GFTTDetector_Impl : public GFTTDetector
+class GFTTDetector_Impl CV_FINAL : public GFTTDetector
 {
 public:
     GFTTDetector_Impl( int _nfeatures, double _qualityLevel,
@@ -55,28 +55,28 @@ public:
     {
     }
 
-    void setMaxFeatures(int maxFeatures) { nfeatures = maxFeatures; }
-    int getMaxFeatures() const { return nfeatures; }
+    void setMaxFeatures(int maxFeatures) CV_OVERRIDE { nfeatures = maxFeatures; }
+    int getMaxFeatures() const CV_OVERRIDE { return nfeatures; }
 
-    void setQualityLevel(double qlevel) { qualityLevel = qlevel; }
-    double getQualityLevel() const { return qualityLevel; }
+    void setQualityLevel(double qlevel) CV_OVERRIDE { qualityLevel = qlevel; }
+    double getQualityLevel() const CV_OVERRIDE { return qualityLevel; }
 
-    void setMinDistance(double minDistance_) { minDistance = minDistance_; }
-    double getMinDistance() const { return minDistance; }
+    void setMinDistance(double minDistance_) CV_OVERRIDE { minDistance = minDistance_; }
+    double getMinDistance() const CV_OVERRIDE { return minDistance; }
 
-    void setBlockSize(int blockSize_) { blockSize = blockSize_; }
-    int getBlockSize() const { return blockSize; }
+    void setBlockSize(int blockSize_) CV_OVERRIDE { blockSize = blockSize_; }
+    int getBlockSize() const CV_OVERRIDE { return blockSize; }
 
-    void setGradientSize(int gradientSize_) { gradSize = gradientSize_; }
-    int getGradientSize() { return gradSize; }
+    //void setGradientSize(int gradientSize_) { gradSize = gradientSize_; }
+    //int getGradientSize() { return gradSize; }
 
-    void setHarrisDetector(bool val) { useHarrisDetector = val; }
-    bool getHarrisDetector() const { return useHarrisDetector; }
+    void setHarrisDetector(bool val) CV_OVERRIDE { useHarrisDetector = val; }
+    bool getHarrisDetector() const CV_OVERRIDE { return useHarrisDetector; }
 
-    void setK(double k_) { k = k_; }
-    double getK() const { return k; }
+    void setK(double k_) CV_OVERRIDE { k = k_; }
+    double getK() const CV_OVERRIDE { return k; }
 
-    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask )
+    void detect( InputArray _image, std::vector<KeyPoint>& keypoints, InputArray _mask ) CV_OVERRIDE
     {
         CV_INSTRUMENT_REGION()
 
diff --git a/modules/features2d/src/kaze.cpp b/modules/features2d/src/kaze.cpp
index 7f2a9ad2bb..a2c5209eeb 100644
--- a/modules/features2d/src/kaze.cpp
+++ b/modules/features2d/src/kaze.cpp
@@ -53,7 +53,7 @@ http://www.robesafe.com/personal/pablo.alcantarilla/papers/Alcantarilla12eccv.pd
 namespace cv
 {
 
-    class KAZE_Impl : public KAZE
+    class KAZE_Impl CV_FINAL : public KAZE
     {
     public:
         KAZE_Impl(bool _extended, bool _upright, float _threshold, int _octaves,
@@ -67,40 +67,40 @@ namespace cv
         {
         }
 
-        virtual ~KAZE_Impl() {}
+        virtual ~KAZE_Impl() CV_OVERRIDE {}
 
-        void setExtended(bool extended_) { extended = extended_; }
-        bool getExtended() const { return extended; }
+        void setExtended(bool extended_) CV_OVERRIDE { extended = extended_; }
+        bool getExtended() const CV_OVERRIDE { return extended; }
 
-        void setUpright(bool upright_) { upright = upright_; }
-        bool getUpright() const { return upright; }
+        void setUpright(bool upright_) CV_OVERRIDE { upright = upright_; }
+        bool getUpright() const CV_OVERRIDE { return upright; }
 
-        void setThreshold(double threshold_) { threshold = (float)threshold_; }
-        double getThreshold() const { return threshold; }
+        void setThreshold(double threshold_) CV_OVERRIDE { threshold = (float)threshold_; }
+        double getThreshold() const CV_OVERRIDE { return threshold; }
 
-        void setNOctaves(int octaves_) { octaves = octaves_; }
-        int getNOctaves() const { return octaves; }
+        void setNOctaves(int octaves_) CV_OVERRIDE { octaves = octaves_; }
+        int getNOctaves() const CV_OVERRIDE { return octaves; }
 
-        void setNOctaveLayers(int octaveLayers_) { sublevels = octaveLayers_; }
-        int getNOctaveLayers() const { return sublevels; }
+        void setNOctaveLayers(int octaveLayers_) CV_OVERRIDE { sublevels = octaveLayers_; }
+        int getNOctaveLayers() const CV_OVERRIDE { return sublevels; }
 
-        void setDiffusivity(int diff_) { diffusivity = diff_; }
-        int getDiffusivity() const { return diffusivity; }
+        void setDiffusivity(int diff_) CV_OVERRIDE { diffusivity = diff_; }
+        int getDiffusivity() const CV_OVERRIDE { return diffusivity; }
 
         // returns the descriptor size in bytes
-        int descriptorSize() const
+        int descriptorSize() const CV_OVERRIDE
         {
             return extended ? 128 : 64;
         }
 
         // returns the descriptor type
-        int descriptorType() const
+        int descriptorType() const CV_OVERRIDE
         {
             return CV_32F;
         }
 
         // returns the default norm type
-        int defaultNorm() const
+        int defaultNorm() const CV_OVERRIDE
         {
             return NORM_L2;
         }
@@ -108,7 +108,7 @@ namespace cv
         void detectAndCompute(InputArray image, InputArray mask,
                               std::vector<KeyPoint>& keypoints,
                               OutputArray descriptors,
-                              bool useProvidedKeypoints)
+                              bool useProvidedKeypoints) CV_OVERRIDE
         {
             CV_INSTRUMENT_REGION()
 
@@ -160,7 +160,7 @@ namespace cv
             }
         }
 
-        void write(FileStorage& fs) const
+        void write(FileStorage& fs) const CV_OVERRIDE
         {
             writeFormat(fs);
             fs << "extended" << (int)extended;
@@ -171,7 +171,7 @@ namespace cv
             fs << "diffusivity" << diffusivity;
         }
 
-        void read(const FileNode& fn)
+        void read(const FileNode& fn) CV_OVERRIDE
         {
             extended = (int)fn["extended"] != 0;
             upright = (int)fn["upright"] != 0;
diff --git a/modules/features2d/src/kaze/AKAZEFeatures.cpp b/modules/features2d/src/kaze/AKAZEFeatures.cpp
index 66acc8ada7..381800eebd 100644
--- a/modules/features2d/src/kaze/AKAZEFeatures.cpp
+++ b/modules/features2d/src/kaze/AKAZEFeatures.cpp
@@ -237,7 +237,7 @@ public:
     : Lt_(&Lt), Lf_(&Lf), Lstep_(&Lstep), step_size_(step_size)
   {}
 
-  void operator()(const Range& range) const
+  void operator()(const Range& range) const CV_OVERRIDE
   {
     nld_step_scalar_one_lane(*Lt_, *Lf_, *Lstep_, step_size_, range.start, range.end);
   }
@@ -603,7 +603,7 @@ public:
   {
   }
 
-  void operator()(const Range& range) const
+  void operator()(const Range& range) const CV_OVERRIDE
   {
     MatType Lxx, Lxy, Lyy;
 
@@ -725,7 +725,7 @@ public:
     : evolution_(&ev), keypoints_by_layers_(&kpts), dthreshold_(dthreshold)
   {}
 
-  void operator()(const Range& range) const
+  void operator()(const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -948,7 +948,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -974,7 +974,7 @@ public:
   {
   }
 
-  void operator()(const Range& range) const
+  void operator()(const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1000,7 +1000,7 @@ public:
   {
   }
 
-  void operator()(const Range& range) const
+  void operator()(const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1026,7 +1026,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1053,7 +1053,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1088,7 +1088,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1119,7 +1119,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1158,7 +1158,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
@@ -1448,7 +1448,7 @@ public:
   {
   }
 
-  void operator() (const Range& range) const
+  void operator() (const Range& range) const CV_OVERRIDE
   {
     for (int i = range.start; i < range.end; i++)
     {
diff --git a/modules/features2d/src/kaze/KAZEFeatures.cpp b/modules/features2d/src/kaze/KAZEFeatures.cpp
index ab5a2c6afb..0cc52d9117 100644
--- a/modules/features2d/src/kaze/KAZEFeatures.cpp
+++ b/modules/features2d/src/kaze/KAZEFeatures.cpp
@@ -196,7 +196,7 @@ public:
     {
     }
 
-    void operator()(const Range& range) const
+    void operator()(const Range& range) const CV_OVERRIDE
     {
         std::vector<TEvolution>& evolution = *evolution_;
         for (int i = range.start; i < range.end; i++)
@@ -239,7 +239,7 @@ public:
     {
     }
 
-    void operator()(const Range& range) const
+    void operator()(const Range& range) const CV_OVERRIDE
     {
         std::vector<TEvolution>& evolution = *evolution_;
         std::vector<std::vector<KeyPoint> >& kpts_par = *kpts_par_;
@@ -503,11 +503,11 @@ public:
     {
     }
 
-    void operator() (const Range& range) const
+    void operator() (const Range& range) const CV_OVERRIDE
     {
-                std::vector<KeyPoint> &kpts      = *kpts_;
-                Mat                   &desc      = *desc_;
-                std::vector<TEvolution>   &evolution = *evolution_;
+        std::vector<KeyPoint> &kpts      = *kpts_;
+        Mat                   &desc      = *desc_;
+        std::vector<TEvolution>   &evolution = *evolution_;
 
         for (int i = range.start; i < range.end; i++)
         {
diff --git a/modules/features2d/src/kaze/nldiffusion_functions.cpp b/modules/features2d/src/kaze/nldiffusion_functions.cpp
index 16b9615328..f87ca172a7 100644
--- a/modules/features2d/src/kaze/nldiffusion_functions.cpp
+++ b/modules/features2d/src/kaze/nldiffusion_functions.cpp
@@ -378,7 +378,7 @@ public:
 
     }
 
-    void operator()(const cv::Range& range) const
+    void operator()(const cv::Range& range) const CV_OVERRIDE
     {
         cv::Mat& Ld = *_Ld;
         const cv::Mat& c = *_c;
diff --git a/modules/features2d/src/mser.cpp b/modules/features2d/src/mser.cpp
index eb9248c681..f37f84a936 100755
--- a/modules/features2d/src/mser.cpp
+++ b/modules/features2d/src/mser.cpp
@@ -48,7 +48,7 @@ namespace cv
 
 using std::vector;
 
-class MSER_Impl : public MSER
+class MSER_Impl CV_FINAL : public MSER
 {
 public:
     struct Params
@@ -85,19 +85,19 @@ public:
 
     explicit MSER_Impl(const Params& _params) : params(_params) {}
 
-    virtual ~MSER_Impl() {}
+    virtual ~MSER_Impl() CV_OVERRIDE {}
 
-    void setDelta(int delta) { params.delta = delta; }
-    int getDelta() const { return params.delta; }
+    void setDelta(int delta) CV_OVERRIDE { params.delta = delta; }
+    int getDelta() const CV_OVERRIDE { return params.delta; }
 
-    void setMinArea(int minArea) { params.minArea = minArea; }
-    int getMinArea() const { return params.minArea; }
+    void setMinArea(int minArea) CV_OVERRIDE { params.minArea = minArea; }
+    int getMinArea() const CV_OVERRIDE { return params.minArea; }
 
-    void setMaxArea(int maxArea) { params.maxArea = maxArea; }
-    int getMaxArea() const { return params.maxArea; }
+    void setMaxArea(int maxArea) CV_OVERRIDE { params.maxArea = maxArea; }
+    int getMaxArea() const CV_OVERRIDE { return params.maxArea; }
 
-    void setPass2Only(bool f) { params.pass2Only = f; }
-    bool getPass2Only() const { return params.pass2Only; }
+    void setPass2Only(bool f) CV_OVERRIDE { params.pass2Only = f; }
+    bool getPass2Only() const CV_OVERRIDE { return params.pass2Only; }
 
     enum { DIR_SHIFT = 29, NEXT_MASK = ((1<<DIR_SHIFT)-1)  };
 
@@ -364,8 +364,8 @@ public:
 
     void detectRegions( InputArray image,
                         std::vector<std::vector<Point> >& msers,
-                        std::vector<Rect>& bboxes );
-    void detect( InputArray _src, vector<KeyPoint>& keypoints, InputArray _mask );
+                        std::vector<Rect>& bboxes ) CV_OVERRIDE;
+    void detect( InputArray _src, vector<KeyPoint>& keypoints, InputArray _mask ) CV_OVERRIDE;
 
     void preprocess1( const Mat& img, int* level_size )
     {
diff --git a/modules/features2d/src/orb.cpp b/modules/features2d/src/orb.cpp
index 722e81b96f..453ddf420d 100644
--- a/modules/features2d/src/orb.cpp
+++ b/modules/features2d/src/orb.cpp
@@ -651,7 +651,7 @@ static inline float getScale(int level, int firstLevel, double scaleFactor)
 }
 
 
-class ORB_Impl : public ORB
+class ORB_Impl CV_FINAL : public ORB
 {
 public:
     explicit ORB_Impl(int _nfeatures, float _scaleFactor, int _nlevels, int _edgeThreshold,
@@ -661,43 +661,43 @@ public:
         scoreType(_scoreType), patchSize(_patchSize), fastThreshold(_fastThreshold)
     {}
 
-    void setMaxFeatures(int maxFeatures) { nfeatures = maxFeatures; }
-    int getMaxFeatures() const { return nfeatures; }
+    void setMaxFeatures(int maxFeatures) CV_OVERRIDE { nfeatures = maxFeatures; }
+    int getMaxFeatures() const CV_OVERRIDE { return nfeatures; }
 
-    void setScaleFactor(double scaleFactor_) { scaleFactor = scaleFactor_; }
-    double getScaleFactor() const { return scaleFactor; }
+    void setScaleFactor(double scaleFactor_) CV_OVERRIDE { scaleFactor = scaleFactor_; }
+    double getScaleFactor() const CV_OVERRIDE { return scaleFactor; }
 
-    void setNLevels(int nlevels_) { nlevels = nlevels_; }
-    int getNLevels() const { return nlevels; }
+    void setNLevels(int nlevels_) CV_OVERRIDE { nlevels = nlevels_; }
+    int getNLevels() const CV_OVERRIDE { return nlevels; }
 
-    void setEdgeThreshold(int edgeThreshold_) { edgeThreshold = edgeThreshold_; }
-    int getEdgeThreshold() const { return edgeThreshold; }
+    void setEdgeThreshold(int edgeThreshold_) CV_OVERRIDE { edgeThreshold = edgeThreshold_; }
+    int getEdgeThreshold() const CV_OVERRIDE { return edgeThreshold; }
 
-    void setFirstLevel(int firstLevel_) { CV_Assert(firstLevel_ >= 0);  firstLevel = firstLevel_; }
-    int getFirstLevel() const { return firstLevel; }
+    void setFirstLevel(int firstLevel_) CV_OVERRIDE { CV_Assert(firstLevel_ >= 0);  firstLevel = firstLevel_; }
+    int getFirstLevel() const CV_OVERRIDE { return firstLevel; }
 
-    void setWTA_K(int wta_k_) { wta_k = wta_k_; }
-    int getWTA_K() const { return wta_k; }
+    void setWTA_K(int wta_k_) CV_OVERRIDE { wta_k = wta_k_; }
+    int getWTA_K() const CV_OVERRIDE { return wta_k; }
 
-    void setScoreType(int scoreType_) { scoreType = scoreType_; }
-    int getScoreType() const { return scoreType; }
+    void setScoreType(int scoreType_) CV_OVERRIDE { scoreType = scoreType_; }
+    int getScoreType() const CV_OVERRIDE { return scoreType; }
 
-    void setPatchSize(int patchSize_) { patchSize = patchSize_; }
-    int getPatchSize() const { return patchSize; }
+    void setPatchSize(int patchSize_) CV_OVERRIDE { patchSize = patchSize_; }
+    int getPatchSize() const CV_OVERRIDE { return patchSize; }
 
-    void setFastThreshold(int fastThreshold_) { fastThreshold = fastThreshold_; }
-    int getFastThreshold() const { return fastThreshold; }
+    void setFastThreshold(int fastThreshold_) CV_OVERRIDE { fastThreshold = fastThreshold_; }
+    int getFastThreshold() const CV_OVERRIDE { return fastThreshold; }
 
     // returns the descriptor size in bytes
-    int descriptorSize() const;
+    int descriptorSize() const CV_OVERRIDE;
     // returns the descriptor type
-    int descriptorType() const;
+    int descriptorType() const CV_OVERRIDE;
     // returns the default norm type
-    int defaultNorm() const;
+    int defaultNorm() const CV_OVERRIDE;
 
     // Compute the ORB_Impl features and descriptors on an image
     void detectAndCompute( InputArray image, InputArray mask, std::vector<KeyPoint>& keypoints,
-                     OutputArray descriptors, bool useProvidedKeypoints=false );
+                     OutputArray descriptors, bool useProvidedKeypoints=false ) CV_OVERRIDE;
 
 protected: