diff --git a/modules/imgproc/src/opencl/integral_sum.cl b/modules/imgproc/src/opencl/integral_sum.cl
index 49a3bde955..3c51c1a28b 100644
--- a/modules/imgproc/src/opencl/integral_sum.cl
+++ b/modules/imgproc/src/opencl/integral_sum.cl
@@ -132,8 +132,11 @@ kernel void integral_sum_rows(__global const uchar *buf_ptr, int buf_step, int b
     }
     dst_sq_offset += dst_sq_step;
 
-    dst_sq = (__global sumSQT *)(dst_sq_ptr + mad24(x, dst_sq_step, dst_sq_offset));
-    dst_sq[0] = 0;
+    if (x < rows - 1)
+    {
+        dst_sq = (__global sumSQT *)(dst_sq_ptr + mad24(x, dst_sq_step, dst_sq_offset));
+        dst_sq[0] = 0;
+    }
 
     int buf_sq_index = mad24((int)sizeof(sumSQT), x, buf_sq_offset);
     sumSQT accum_sq = 0;
diff --git a/modules/imgproc/test/ocl/test_blend.cpp b/modules/imgproc/test/ocl/test_blend.cpp
index 7b62b97172..6d8a15fb2b 100644
--- a/modules/imgproc/test/ocl/test_blend.cpp
+++ b/modules/imgproc/test/ocl/test_blend.cpp
@@ -117,7 +117,7 @@ OCL_TEST_P(BlendLinear, Accuracy)
         OCL_OFF(cv::blendLinear(src1_roi, src2_roi, weights1_roi, weights2_roi, dst_roi));
         OCL_ON(cv::blendLinear(usrc1_roi, usrc2_roi, uweights1_roi, uweights2_roi, udst_roi));
 
-        Near(depth <= CV_32S ? 1.0 : 0.2);
+        Near(depth <= CV_32S ? 1.0 : 0.5);
     }
 }
 
diff --git a/modules/imgproc/test/ocl/test_boxfilter.cpp b/modules/imgproc/test/ocl/test_boxfilter.cpp
index 63f4ebff20..4940dff799 100644
--- a/modules/imgproc/test/ocl/test_boxfilter.cpp
+++ b/modules/imgproc/test/ocl/test_boxfilter.cpp
@@ -109,7 +109,7 @@ OCL_TEST_P(BoxFilter, Mat)
         OCL_OFF(cv::boxFilter(src_roi, dst_roi, -1, ksize, anchor, normalize, borderType));
         OCL_ON(cv::boxFilter(usrc_roi, udst_roi, -1, ksize, anchor, normalize, borderType));
 
-        Near(depth <= CV_32S ? 1 : 1e-3);
+        Near(depth <= CV_32S ? 1 : 3e-3);
     }
 }
 
diff --git a/modules/imgproc/test/ocl/test_color.cpp b/modules/imgproc/test/ocl/test_color.cpp
index 82bf2c06f1..5f3a2f73f9 100644
--- a/modules/imgproc/test/ocl/test_color.cpp
+++ b/modules/imgproc/test/ocl/test_color.cpp
@@ -302,14 +302,14 @@ OCL_TEST_P(CvtColor8u32f, Lab2LRGBA) { performTest(3, 4, CVTCODE(Lab2LRGB), dept
 
 // RGB -> Luv
 
-OCL_TEST_P(CvtColor8u32f, BGR2Luv) { performTest(3, 3, CVTCODE(BGR2Luv), depth == CV_8U ? 1 : 1e-2); }
-OCL_TEST_P(CvtColor8u32f, RGB2Luv) { performTest(3, 3, CVTCODE(RGB2Luv), depth == CV_8U ? 1 : 1e-2); }
-OCL_TEST_P(CvtColor8u32f, LBGR2Luv) { performTest(3, 3, CVTCODE(LBGR2Luv), depth == CV_8U ? 1 : 4e-3); }
-OCL_TEST_P(CvtColor8u32f, LRGB2Luv) { performTest(3, 3, CVTCODE(LRGB2Luv), depth == CV_8U ? 1 : 5e-3); }
-OCL_TEST_P(CvtColor8u32f, BGRA2Luv) { performTest(4, 3, CVTCODE(BGR2Luv), depth == CV_8U ? 1 : 8e-3); }
-OCL_TEST_P(CvtColor8u32f, RGBA2Luv) { performTest(4, 3, CVTCODE(RGB2Luv), depth == CV_8U ? 1 : 9e-3); }
-OCL_TEST_P(CvtColor8u32f, LBGRA2Luv) { performTest(4, 3, CVTCODE(LBGR2Luv), depth == CV_8U ? 1 : 5e-3); }
-OCL_TEST_P(CvtColor8u32f, LRGBA2Luv) { performTest(4, 3, CVTCODE(LRGB2Luv), depth == CV_8U ? 1 : 5e-3); }
+OCL_TEST_P(CvtColor8u32f, BGR2Luv) { performTest(3, 3, CVTCODE(BGR2Luv), depth == CV_8U ? 1 : 1.5e-2); }
+OCL_TEST_P(CvtColor8u32f, RGB2Luv) { performTest(3, 3, CVTCODE(RGB2Luv), depth == CV_8U ? 1 : 1.5e-2); }
+OCL_TEST_P(CvtColor8u32f, LBGR2Luv) { performTest(3, 3, CVTCODE(LBGR2Luv), depth == CV_8U ? 1 : 6e-3); }
+OCL_TEST_P(CvtColor8u32f, LRGB2Luv) { performTest(3, 3, CVTCODE(LRGB2Luv), depth == CV_8U ? 1 : 6e-3); }
+OCL_TEST_P(CvtColor8u32f, BGRA2Luv) { performTest(4, 3, CVTCODE(BGR2Luv), depth == CV_8U ? 1 : 2e-2); }
+OCL_TEST_P(CvtColor8u32f, RGBA2Luv) { performTest(4, 3, CVTCODE(RGB2Luv), depth == CV_8U ? 1 : 2e-2); }
+OCL_TEST_P(CvtColor8u32f, LBGRA2Luv) { performTest(4, 3, CVTCODE(LBGR2Luv), depth == CV_8U ? 1 : 6e-3); }
+OCL_TEST_P(CvtColor8u32f, LRGBA2Luv) { performTest(4, 3, CVTCODE(LRGB2Luv), depth == CV_8U ? 1 : 6e-3); }
 
 OCL_TEST_P(CvtColor8u32f, Luv2BGR) { performTest(3, 3, CVTCODE(Luv2BGR), depth == CV_8U ? 1 : 7e-5); }
 OCL_TEST_P(CvtColor8u32f, Luv2RGB) { performTest(3, 3, CVTCODE(Luv2RGB), depth == CV_8U ? 1 : 7e-5); }