remove redundant OPENCL_DIR flag

remove as much warnings as possible
use enum instead of MACRO for ocl.hpp
add command line parser in accuracy test and perf test
some bug fix for arthim functions

modules/ocl/test/test_canny.cpp

@@ -45,16 +45,11 @@
 
 #include "precomp.hpp"
 #ifdef HAVE_OPENCL
-#ifdef WIN32
-#define FILTER_IMAGE "C:/Users/Public/Pictures/Sample Pictures/Penguins.jpg"
-#else
-#define FILTER_IMAGE "/Users/Test/Valve_original.PNG" // user need to specify a valid image path
-#endif
 #define SHOW_RESULT 0
 
 ////////////////////////////////////////////////////////
 // Canny
-
+extern std::string workdir;
 IMPLEMENT_PARAM_CLASS(AppertureSize, int);
 IMPLEMENT_PARAM_CLASS(L2gradient, bool);
 
@@ -76,7 +71,7 @@ PARAM_TEST_CASE(Canny, AppertureSize, L2gradient)
 
 TEST_P(Canny, Accuracy)
 {
-    cv::Mat img = readImage(FILTER_IMAGE, cv::IMREAD_GRAYSCALE);
+    cv::Mat img = readImage(workdir + "fruits.jpg", cv::IMREAD_GRAYSCALE);
     ASSERT_FALSE(img.empty());
 
     double low_thresh = 50.0;
@@ -110,4 +105,4 @@ TEST_P(Canny, Accuracy)
 INSTANTIATE_TEST_CASE_P(GPU_ImgProc, Canny, testing::Combine(
                             testing::Values(AppertureSize(3), AppertureSize(5)),
                             testing::Values(L2gradient(false), L2gradient(true))));
-#endif
+#endif