diff --git a/modules/imgproc/src/color.cpp b/modules/imgproc/src/color.cpp
index 324b824ae0..a6cebe6bc0 100644
--- a/modules/imgproc/src/color.cpp
+++ b/modules/imgproc/src/color.cpp
@@ -4997,6 +4997,20 @@ static bool ocl_cvtColor( InputArray _src, OutputArray _dst, int code, int dcn )
                  src.isContinuous() ? " -D SRC_CONT" : ""));
         break;
     }
+    case COLOR_YUV2GRAY_420:
+    {
+        if (dcn <= 0) dcn = 1;
+
+        CV_Assert( dcn == 1 );
+        CV_Assert( sz.width % 2 == 0 && sz.height % 3 == 0 && depth == CV_8U );
+
+        dstSz = Size(sz.width, sz.height * 2 / 3);
+        _dst.create(dstSz, CV_MAKETYPE(depth, dcn));
+        dst = _dst.getUMat();
+
+        src.rowRange(0, dstSz.height).copyTo(dst);
+        return true;
+    }
     case COLOR_BGR2YCrCb:
     case COLOR_RGB2YCrCb:
     {
diff --git a/modules/imgproc/test/ocl/test_color.cpp b/modules/imgproc/test/ocl/test_color.cpp
index 2055326a90..43343469c5 100644
--- a/modules/imgproc/test/ocl/test_color.cpp
+++ b/modules/imgproc/test/ocl/test_color.cpp
@@ -344,22 +344,23 @@ struct CvtColor_YUV420 :
     }
 };
 
-OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_NV12) { performTest(1, 4, COLOR_YUV2RGBA_NV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_NV12) { performTest(1, 4, COLOR_YUV2BGRA_NV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGB_NV12) { performTest(1, 3, COLOR_YUV2RGB_NV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGR_NV12) { performTest(1, 3, COLOR_YUV2BGR_NV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_NV21) { performTest(1, 4, COLOR_YUV2RGBA_NV21); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_NV21) { performTest(1, 4, COLOR_YUV2BGRA_NV21); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGB_NV21) { performTest(1, 3, COLOR_YUV2RGB_NV21); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGR_NV21) { performTest(1, 3, COLOR_YUV2BGR_NV21); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_YV12) { performTest(1, 4, COLOR_YUV2RGBA_YV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_YV12) { performTest(1, 4, COLOR_YUV2BGRA_YV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGB_YV12) { performTest(1, 3, COLOR_YUV2RGB_YV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGR_YV12) { performTest(1, 3, COLOR_YUV2BGR_YV12); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_IYUV) { performTest(1, 4, COLOR_YUV2RGBA_IYUV); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_IYUV) { performTest(1, 4, COLOR_YUV2BGRA_IYUV); }
-OCL_TEST_P(CvtColor_YUV420, YUV2RGB_IYUV) { performTest(1, 3, COLOR_YUV2RGB_IYUV); }
-OCL_TEST_P(CvtColor_YUV420, YUV2BGR_IYUV) { performTest(1, 3, COLOR_YUV2BGR_IYUV); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_NV12) { performTest(1, 4, CVTCODE(YUV2RGBA_NV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_NV12) { performTest(1, 4, CVTCODE(YUV2BGRA_NV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGB_NV12) { performTest(1, 3, CVTCODE(YUV2RGB_NV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGR_NV12) { performTest(1, 3, CVTCODE(YUV2BGR_NV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_NV21) { performTest(1, 4, CVTCODE(YUV2RGBA_NV21)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_NV21) { performTest(1, 4, CVTCODE(YUV2BGRA_NV21)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGB_NV21) { performTest(1, 3, CVTCODE(YUV2RGB_NV21)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGR_NV21) { performTest(1, 3, CVTCODE(YUV2BGR_NV21)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_YV12) { performTest(1, 4, CVTCODE(YUV2RGBA_YV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_YV12) { performTest(1, 4, CVTCODE(YUV2BGRA_YV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGB_YV12) { performTest(1, 3, CVTCODE(YUV2RGB_YV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGR_YV12) { performTest(1, 3, CVTCODE(YUV2BGR_YV12)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGBA_IYUV) { performTest(1, 4, CVTCODE(YUV2RGBA_IYUV)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGRA_IYUV) { performTest(1, 4, CVTCODE(YUV2BGRA_IYUV)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2RGB_IYUV) { performTest(1, 3, CVTCODE(YUV2RGB_IYUV)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2BGR_IYUV) { performTest(1, 3, CVTCODE(YUV2BGR_IYUV)); }
+OCL_TEST_P(CvtColor_YUV420, YUV2GRAY_420) { performTest(1, 1, CVTCODE(YUV2GRAY_420)); }
 
 
 OCL_INSTANTIATE_TEST_CASE_P(ImgProc, CvtColor8u,