Remove empty cv::ocl::CLAHE class.

modules/ocl/include/opencv2/ocl/ocl.hpp

@@ -516,10 +516,7 @@ namespace cv
         CV_EXPORTS void equalizeHist(const oclMat &mat_src, oclMat &mat_dst);
         
         //! only 8UC1 is supported now
-        class CV_EXPORTS CLAHE : public cv::CLAHE
-        {
-        };
-        CV_EXPORTS Ptr<cv::ocl::CLAHE> createCLAHE(double clipLimit = 40.0, Size tileGridSize = Size(8, 8));
+        CV_EXPORTS Ptr<cv::CLAHE> createCLAHE(double clipLimit = 40.0, Size tileGridSize = Size(8, 8));
         
         //! bilateralFilter
         // supports 8UC1 8UC4

modules/ocl/perf/perf_imgproc.cpp

@@ -932,8 +932,8 @@ PERFTEST(CLAHE)
 
     double clipLimit = 40.0;
 
-    cv::Ptr<cv::CLAHE>      clahe   = cv::createCLAHE(clipLimit);
-    cv::Ptr<cv::ocl::CLAHE> d_clahe = cv::ocl::createCLAHE(clipLimit);
+    cv::Ptr<cv::CLAHE> clahe   = cv::createCLAHE(clipLimit);
+    cv::Ptr<cv::CLAHE> d_clahe = cv::ocl::createCLAHE(clipLimit);
 
     for (int size = Min_Size; size <= Max_Size; size *= Multiple)
     {

modules/ocl/src/imgproc.cpp

@@ -1591,7 +1591,7 @@ namespace cv
 
         namespace
         {
-            class CLAHE_Impl : public cv::ocl::CLAHE
+            class CLAHE_Impl : public cv::CLAHE
             {
             public:
                 CLAHE_Impl(double clipLimit = 40.0, int tilesX = 8, int tilesY = 8);
@@ -1696,7 +1696,7 @@ namespace cv
             }
         }
 
-        cv::Ptr<cv::ocl::CLAHE> createCLAHE(double clipLimit, cv::Size tileGridSize)
+        cv::Ptr<cv::CLAHE> createCLAHE(double clipLimit, cv::Size tileGridSize)
         {
             return new CLAHE_Impl(clipLimit, tileGridSize.width, tileGridSize.height);
         }

modules/ocl/test/test_imgproc.cpp

@@ -1425,7 +1425,7 @@ PARAM_TEST_CASE(CLAHE, cv::Size, ClipLimit)
 
 TEST_P(CLAHE, Accuracy)
 {
-    cv::Ptr<cv::ocl::CLAHE> clahe = cv::ocl::createCLAHE(clipLimit);
+    cv::Ptr<cv::CLAHE> clahe = cv::ocl::createCLAHE(clipLimit);
     clahe->apply(g_src, g_dst);
     cv::Mat dst(g_dst);