From 5bafc1db757ca736dd8338fb9831d41c92f0608f Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Tue, 18 Oct 2016 16:58:20 +0300
Subject: [PATCH] test: fix tolerance

cv::rand result is not bitexact for floating-point numbers
---
 modules/core/perf/perf_merge.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/core/perf/perf_merge.cpp b/modules/core/perf/perf_merge.cpp
index e7e8d2fe3f..6af7feeb41 100644
--- a/modules/core/perf/perf_merge.cpp
+++ b/modules/core/perf/perf_merge.cpp
@@ -22,16 +22,19 @@ PERF_TEST_P( Size_SrcDepth_DstChannels, merge,
     int srcDepth = get<1>(GetParam());
     int dstChannels = get<2>(GetParam());
 
+    int maxValue = 255;
+
     vector<Mat> mv;
     for( int i = 0; i < dstChannels; ++i )
     {
         mv.push_back( Mat(sz, CV_MAKETYPE(srcDepth, 1)) );
-        randu(mv[i], 0, 255);
+        randu(mv[i], 0, maxValue);
     }
 
     Mat dst;
     int runs = (sz.width <= 640) ? 8 : 1;
     TEST_CYCLE_MULTIRUN(runs) merge( (vector<Mat> &)mv, dst );
 
-    SANITY_CHECK(dst, 1e-12);
+    double eps = srcDepth <= CV_32S ? 1e-12 : (FLT_EPSILON * maxValue);
+    SANITY_CHECK(dst, eps);
 }