fix tests

modules/imgproc/test/ocl/test_color.cpp

@@ -158,7 +158,7 @@ OCL_TEST_P(CvtColor, YCrCb2BGRA) { performTest(3, 4, CVTCODE(YCrCb2BGR)); }
 #if IPP_VERSION_X100 > 0
 #define IPP_EPS depth <= CV_32S ? 1 : 4e-5
 #else
-#define IPP_EPS 0
+#define IPP_EPS 1e-3
 #endif
 
 OCL_TEST_P(CvtColor, RGB2XYZ) { performTest(3, 3, CVTCODE(RGB2XYZ), IPP_EPS); }

modules/imgproc/test/ocl/test_histogram.cpp

@@ -146,7 +146,7 @@ PARAM_TEST_CASE(CalcBackProject, MatDepth, int, bool)
         scale = randomDouble(0.1, 1);
     }
 
-    virtual void test_by_pict()
+    void test_by_pict()
     {
         Mat frame1 = readImage("optflow/RubberWhale1.png", IMREAD_GRAYSCALE);
 
@@ -174,7 +174,19 @@ PARAM_TEST_CASE(CalcBackProject, MatDepth, int, bool)
 
         OCL_OFF(calcBackProject(&frame1, 1, 0, hist1, dst1, &ranges1, 1, true));
         OCL_ON(calcBackProject(uims, chs, uhist1, udst1, urngs, 1.0));
-        EXPECT_MAT_NEAR(dst1, udst1, 0.0);
+
+        if (cv::ocl::useOpenCL() && cv::ocl::Device::getDefault().isAMD())
+        {
+            Size dstSize = dst1.size();
+            int nDiffs = (int)(0.03f*dstSize.height*dstSize.width);
+
+            //check if the dst mats are the same except 3% difference
+            EXPECT_MAT_N_DIFF(dst1, udst1, nDiffs);
+        }
+        else
+        {
+            EXPECT_MAT_NEAR(dst1, udst1, 0.0);
+        }
     }
 };
 
@@ -194,12 +206,15 @@ OCL_TEST_P(CalcBackProject, Mat)
 
         //check if the dst mats are the same except 3% difference
         EXPECT_MAT_N_DIFF(dst_roi, udst_roi, nDiffs);
-
-        //check in addition on given image
-        test_by_pict();
     }
 }
 
+OCL_TEST_P(CalcBackProject, Mat_RealImage)
+{
+    //check on given image
+    test_by_pict();
+}
+
 //////////////////////////////// CalcHist //////////////////////////////////////////////
 
 PARAM_TEST_CASE(CalcHist, bool)