add multiruns to fix "unreliable results" error

modules/core/perf/perf_reduce.cpp

@@ -34,7 +34,8 @@ PERF_TEST_P(Size_MatType_ROp, reduceR,
     declare.in(src, WARMUP_RNG).out(vec);
     declare.time(100);
 
-    TEST_CYCLE() reduce(src, vec, 0, reduceOp, ddepth);
+    int runs = 15;
+    TEST_CYCLE_MULTIRUN(runs) reduce(src, vec, 0, reduceOp, ddepth);
 
     SANITY_CHECK(vec, 1);
 }
@@ -65,4 +66,3 @@ PERF_TEST_P(Size_MatType_ROp, reduceC,
 
     SANITY_CHECK(vec, 1);
 }
-

modules/imgproc/perf/perf_cvt_color.cpp

@@ -258,7 +258,8 @@ PERF_TEST_P(Size_CvtMode, cvtColor8u,
     declare.time(100);
     declare.in(src, WARMUP_RNG).out(dst);
 
-    TEST_CYCLE() cvtColor(src, dst, mode, ch.dcn);
+    int runs = sz.width <= 320 ? 70 : 1;
+    TEST_CYCLE_MULTIRUN(runs) cvtColor(src, dst, mode, ch.dcn);
 
     SANITY_CHECK(dst, 1);
 }
@@ -334,7 +335,8 @@ PERF_TEST_P(Size_CvtMode3, cvtColorRGB2YUV420p,
     declare.time(100);
     declare.in(src, WARMUP_RNG).out(dst);
 
-    TEST_CYCLE() cvtColor(src, dst, mode, ch.dcn);
+    int runs = (sz.width <= 640) ? 10 : 1;
+    TEST_CYCLE_MULTIRUN(runs) cvtColor(src, dst, mode, ch.dcn);
 
     SANITY_CHECK(dst, 1);
 }

modules/imgproc/perf/perf_morph.cpp

@@ -19,7 +19,8 @@ PERF_TEST_P(Size_MatType, erode, TYPICAL_MATS_MORPH)
 
     declare.in(src, WARMUP_RNG).out(dst);
 
-    TEST_CYCLE() erode(src, dst, noArray());
+    int runs = (sz.width <= 320) ? 15 : 1;
+    TEST_CYCLE_MULTIRUN(runs) erode(src, dst, noArray());
 
     SANITY_CHECK(dst);
 }

modules/imgproc/perf/perf_remap.cpp

@@ -63,7 +63,8 @@ PERF_TEST_P( TestRemap, Remap,
 
     declare.in(src, WARMUP_RNG).out(dst).time(20);
 
-    TEST_CYCLE() remap(src, dst, map1, map2, inter_type);
+    int runs = (sz.width <= 640) ? 3 : 1;
+    TEST_CYCLE_MULTIRUN(runs) remap(src, dst, map1, map2, inter_type);
 
     SANITY_CHECK(dst);
 }

modules/imgproc/perf/perf_threshold.cpp

@@ -32,7 +32,7 @@ PERF_TEST_P(Size_MatType_ThreshType, threshold,
 
     declare.in(src, WARMUP_RNG).out(dst);
 
-    int runs = (sz.width <= 640) ? 8 : 1;
+    int runs = (sz.width <= 640) ? 40 : 1;
     TEST_CYCLE_MULTIRUN(runs) threshold(src, dst, thresh, maxval, threshType);
 
     SANITY_CHECK(dst);

modules/video/perf/perf_optflowpyrlk.cpp

@@ -165,7 +165,8 @@ PERF_TEST_P(Path_Idx_Cn_NPoints_WSize_Deriv, OpticalFlowPyrLK_self, testing::Com
     declare.in(pyramid1, pyramid2, inPoints).out(outPoints);
     declare.time(400);
 
-    TEST_CYCLE()
+    int runs = 3;
+    TEST_CYCLE_MULTIRUN(runs)
     {
         calcOpticalFlowPyrLK(pyramid1, pyramid2, inPoints, outPoints, status, err,
                              Size(winSize, winSize), maxLevel, criteria,
@@ -217,4 +218,4 @@ PERF_TEST_P(Path_Win_Deriv_Border_Reuse, OpticalFlowPyrLK_pyr, testing::Combine(
     }
 
     SANITY_CHECK(pyramid);
-}
+}