Naive impl. Slower than CPU

modules/ocl/include/opencv2/ocl.hpp

@@ -1546,6 +1546,26 @@ namespace cv
             int calcKeypointsOCL(const oclMat& img, const oclMat& mask, int maxKeypoints);
             int nonmaxSupressionOCL(oclMat& keypoints);
         };
+        ////////////////////////////////// BRIEF Feature Descriptor //////////////////////////////////
+        class CV_EXPORTS BRIEF_OCL
+        {
+        public:
+            static const int PATCH_SIZE = 48;
+            static const int KERNEL_SIZE = 9;
+
+            explicit BRIEF_OCL( int _bytes = 32 );
+
+            /*
+             * Compute the descriptors for a set of keypoints in an image.
+             * image        The image.
+             * keypoints    The input keypoints. Keypoints for which a descriptor cannot be computed are removed.
+             * descriptors  Copmputed descriptors. Row i is the descriptor for keypoint i.
+             */
+            void compute( const oclMat& image, oclMat& keypoints, oclMat& descriptors ) const;
+        protected:
+
+            int bytes;
+        };
 
         /////////////////////////////// PyrLKOpticalFlow /////////////////////////////////////